UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K/A

Amendment No. 1

(Mark One)

Commission File Number

000-50080

SI International, Inc.

(Exact Name of Registrant as Specified in Its Charter)

Registrant’s Telephone Number, Including Area Code: (703) 234-7000

Securities to be registered pursuant to Section 12(b) of the Act:

Securities to be registered pursuant to Section 12(g) of the Act:

Common Stock, $0.01 par value per share

(Title of Class)

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes o No ý

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act. Yes o No ý

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15 (d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ý No o

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K. o

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, or a non-accelerated filer. See definition of “accelerated filer and large accelerated filer” in Rule 12b-2 of the Exchange Act. (Check one):

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act). Yes o No ý

The aggregate market value of SI International, Inc. Common Stock held by non-affiliates of the registrant as of June 25, 2005 was $288,381,811.

As of May 1, 2006, there were 12,828,159 shares of SI International, Inc. Common Stock, $0.01 par value per share, outstanding.

DOCUMENTS INCORPORATED BY REFERENCE

Certain portions of the registrant’s annual report to stockholders for the fiscal year ended December 31, 2005 are incorporated by reference into Part II and III of this Form 10-K. Certain portions of the definitive proxy statement to be used in connection with SI International, Inc.’s annual meeting of stockholders, which was filed with the Securities and Exchange Commission on April 25, 2006 are incorporated by reference into Part III of this Form 10-K.

EXPLANATORY NOTE: This Form 10-K/A is being filed for the purpose of amending and restating Item 9A of our Form 10-K for the year ended December 31, 2005 (the “Form 10-K”) to incorporate our responses to comments received from the Division of Corporation Finance of the Securities and Exchange Commission (the “Staff”) in connection with the Staff’s review of our Form 10-K. Unless otherwise indicated, all information in this Form 10-K/A is as of December 31, 2005 and does not reflect any subsequent information or events.

SI INTERNATIONAL, INC.

FORM 10-K

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BUSINESS INFORMATION

Throughout this document, we occasionally distinguish between SI International, Inc., as a company separate from its subsidiaries, and SI International, Inc., as a company combined with its subsidiaries. In order to clarify which entity we are referring to in various discussions, we use the terms “SI International, Inc.” and “SI International” to refer to SI International, Inc. without its subsidiaries. All other references, including “SI,” “the Company,” “we” and “us” refer to SI International and its subsidiaries.

Some of the statements under Item 1. “Business,” Item 7. “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” and elsewhere in this Form 10 K constitute forward looking statements. These statements involve known and unknown risks, uncertainties, and other factors that may cause our actual results, levels of activity, performance or achievements to be materially different from any future results, levels of activity, performance or achievements expressed or implied by such forward looking statements. In some cases, you can identify these statements by forward looking words such as “anticipate,” “believe,” “could,” “estimate,” “expect,” “intend,” “may,” “plan,” “potential,” “should,” “will,” and “would” or similar words. You should read statements that contain these words carefully because they discuss our future expectations, contain projections of our future results of operations or of our financial position, or state other forward looking information. We believe that it is important to communicate our future expectations to our investors. However, there may be events in the future that we are not able to predict accurately or control. The factors listed in the section captioned Item 1A. “Risk Factors,” as well as any cautionary language in this Form 10 K, provide examples of risks, uncertainties, and events that may cause our actual results to differ materially from the expectations we describe in our forward looking statements.

Although we believe that the expectations reflected in the forward looking statements are reasonable, we cannot guarantee future results, levels of activity, performance or achievements. You should not place undue reliance on these forward looking statements, which apply only as of the date of this Form 10 K. Subsequent events and developments may cause our views to change. However, while we may elect to update these forward looking statements at some point in the future, we specifically disclaim any obligation to do so.

PART I

Item 1. Business   SI International, Inc. was organized as a Delaware corporation under the name of “SI International, Incorporated” on October 14, 1998. SI International conducts operations both in its own name and through subsidiaries, each of which is located in the U.S. but some of which have international operations.

Recent Events

Zen Acquisition.  On February 27, 2006, we closed the acquisition of Zen Technology, Inc, or Zen, a Virginia corporation, pursuant to a Stock Purchase Agreement dated February 8, 2006 (the “Zen Agreement”). Zen is a provider of critical IT services, specializing in managed network services, information assurance, software development and systems engineering, database and systems administration and IT consulting to various U.S. Government agencies. Zen’s largest clients include the Missile Defense Agency (MDA), Department of Defense’s Washington Headquarters Services (WHS), Federal Communications Commission (FCC), the Pension Benefit Guaranty Corporation (PBGC), and the Federal Trade Commission (FTC). As a result of our acquisition of Zen, we gained approximately 275 employees, of which approximately 50% hold security clearances. The acquisition of Zen provides additional scale with existing customers as well as diversification with new government customers.

Pursuant to the terms of the Zen Agreement we acquired all of the outstanding capital stock of Zen for $60 million in cash, of which we are withholding $6 million for 15 months in order to secure post-closing indemnity obligations of the sellers. The purchase price is subject to a two-way adjustment based upon whether the working capital of Zen as of the closing date was above or below the target working capital specified in the Zen Agreement. Each of the parties to the Zen Agreement has made customary representations and warranties and agreed to certain indemnification obligations. The transaction was

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funded through cash-on-hand, a subordinated Seller’s Note in the amount of $6 million, and borrowing from our newly amended credit facility, which is described below. We expect the acquisition to be accretive to earnings. Zen’s trailing twelve months revenue ended November 30, 2005, was approximately $38 million (unaudited).

Amendment to Credit Facility.  On February 27, 2006, contemporaneously with our closing the acquisition of Zen, we entered into a First Amendment to the Amended and Restated Credit Agreement, or First Amendment, with a syndicate of lenders, including Wachovia Bank, National Association, a national banking association, which acted as administrative agent for the lenders.

The First Amendment amended the terms and conditions of the Amended and Restated Credit Agreement entered into on February 9, 2005, or the Credit Agreement, by (i) establishing a new term loan in the principal amount of approximately $129.3 million, which replaced the then existing term loan under the Credit Agreement, (ii) reducing both the base rate margin and the LIBOR margin on the term facility, (iii) increasing the leverage ratio for the financial covenants and (iv) amending certain restrictive covenants. The principal balance of the new term loan is to be repaid in quarterly installments commencing March 31, 2006, with the balance due upon the expiration of the Credit Agreement, as amended, or the Amended Credit Agreement, on February 9, 2011. If an event of default occurs and is continuing, we may be required immediately to repay all amounts outstanding under the Amended Credit Agreement.

The funds borrowed under the new term loan were used to (i) refinance the approximately $99.3 million in principal outstanding under the then existing term loan under the Credit Agreement and to pay any and all fees and expenses related thereto; (ii) to finance the acquisition of Zen and pay any and all fees and expenses related thereto; and (iii) to provide for working capital expenditures, and other general corporate uses.

The borrowing capacity under the Amended Credit Agreement totals approximately $189.3 million and is comprised of a $60 million five-year revolving credit facility and approximately $129.3 million term loan facility. Additionally, a $75 million uncommitted incremental term loan facility will be available upon our request at any time for up to two years from the date of the Credit Agreement from one or more of the lenders.

NVC Contract Award.  On January 31, 2006, in a recompetition for our expiring National Visa Center, or NVC, contract, we were awarded the successor contract for the NVC contract by the Department of State. Under the contract, we anticipate performing over 20 million immigrant visa transactions each year at the NVC in Portsmouth, New Hampshire and at the Kentucky Consular Center in Williamsburg, Kentucky. The prime contract has a one-year base period and four one-year options with an announced value of approximately $84 million, inclusive of the options.

Acceleration of Vesting of Stock Options.  On December 13, 2005, our Board of Directors approved the accelerated vesting of unvested stock options previously awarded to employees, officers and directors as of December 7, 2005 in light of new accounting regulations that were to come into effect January 1, 2006. Based on the Statement of Financial Accounting Standards No. 123R, “Share-Based Payment” (SFAS 123R), the Board took the action to accelerate the unvested stock with the belief that it is in the best interest of stockholders, as it will reduce the Company’s reported compensation expense in future periods.

Overview

We are a provider of mission critical information technology and network solutions primarily to the Federal Government. Our business is guided by our experienced team of eight executive officers and over twenty-five other corporate officers who manage and are responsible for successfully growing our business. As of the end of fiscal year 2005, we employed over 4,000 employees. Approximately 85% of our employees hold Federal Government security clearances or have passed National Agency Checks. Approximately 15% of our employees hold Top Secret security clearances. A significant portion of our

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employees who hold Top Secret security clearances also hold Sensitive Compartmental Information clearances, which permit us to bid on highly classified projects.

Our broad set of contract vehicles gives us extensive reach and enables us to deliver a full range of our services and solutions to the Federal Government. The strength of our service offerings and information technology expertise allows us to maintain substantial relationships with clients, some of whom have been clients of ours, or of one of our acquired businesses, for over 20 years. In fiscal 2005 and fiscal 2004, we derived approximately 75% and 81%, respectively, of our revenue from contracts on which we acted as prime contractor. Acting as a prime contractor provides us with stronger client relationships, as well as the visibility and access to new work that are not available when acting as a subcontractor. Our total backlog as of December 31, 2005 was approximately $854 million, of which approximately $191 million was funded. See “—Backlog” for a discussion of how we calculate backlog.

The Federal Government technology services market

The ongoing transformation of the Federal Government’s information systems and communication networks is creating an increase in its demand for information technology, or IT, services. According to INPUT, an independent market research firm, the federal market demand for vendor-furnished information systems and services is projected to increase by $19.6 billion from $59.2 billion in government fiscal 2005 to $78.8 billion in government fiscal 2010, a compound annual growth rate of approximately 5.9%. In addition, the addressable IT spending, which is the amount that is contracted out, for the U.S. Air Force, our single largest client in terms of revenue for each of the last four completed fiscal years, is projected by INPUT to grow from $4.8 billion in government fiscal 2005 to $7.0 billion in government fiscal 2010, representing a compounded annual growth rate of 7.8%. The Department of Homeland Security addressable portion of the IT budget is projected by INPUT to grow from $4.5 billion in government fiscal 2005 to $6.4 billion in government fiscal 2010, representing a compounded annual growth rate of 7.6%. Spending for federal IT requested by the U.S. Office of Management and Budget (OMB) in government fiscal 2006 shows an increase of 9.0% over the government fiscal 2005 request, according to INPUT.

We expect that the Federal Government’s need for the types of IT services that we provide will continue to grow in the foreseeable future, as a result of the high priority placed by the federal government on the transformation of its IT programs. INPUT forecasts that the percentage of IT spending that is contracted out by the federal government will reach a high of 86% of total IT spending in government fiscal 2010. According to INPUT, the government fiscal 2006 IT budget request of 7% over the enacted government fiscal 2005 budget, at a time when the request for overall federal spending was nearly flat, demonstrated the importance the administration places on IT as an integral part of federal business processes.

We believe the following industry trends will also continue to drive the Federal Government technology services market:

•                    Continued focus on mission-critical initiatives.  Since the events of September 11, 2001, the Federal Government has made the transformation of its IT infrastructure a major priority. According to INPUT, the Federal Government IT services “commercial” segment, which is comprised of outsourcing, professional services, systems integration and processing services, is projected to grow from $25.1 billion in government fiscal 2005 to $34.1 billion in government fiscal 2010, representing a projected compounded annual growth rate of 6.1%. According to INPUT, growth in the commercial segment for the U.S. Air Force is projected to rise from $1.7 billion in government fiscal 2005 to $2.6 billion in government fiscal year 2010, a compounded annual growth rate of 8.9%.

•                    Increased Federal Government reliance on outsourcing.  According to INPUT, outsourcing through the use of outside providers to provide Federal Government services is projected to grow from $12.3 billion in government fiscal 2005 to $17 billion in government fiscal 2010, representing a projected compounded annual growth rate of 6.9%.

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We believe that the Federal Government is increasingly turning to the IT industry to execute support processes and functions that were traditionally performed by Federal Government employees. INPUT expects that Department of Defense (DoD) budgets will continue to grow over the next several governmental fiscal years and anticipates that each of the defense agencies will move toward outsourcing more of the information technology functions that are not core to the war-fighting mission. Business process outsourcing, or BPO, is a relationship in which a contractor is responsible for performing an entire business operations function, including the information systems outsourcing that supports it. INPUT projects that Federal Government BPO spending will grow from $555 million in government fiscal 2005 to $857 million in government fiscal in 2010, which represents a compounded annual growth rate of 9.1%. In addition, during this same period, INPUT projects a compounded annual growth rate for BPO spending by defense agencies of 8.3%. According to INPUT, the size of the Federal Government workforce, which includes only civilian employees and non-uniform military personnel in federal civilian agencies and the DoD, decreased by 1.1 million workers during the period 1990 through 2000, representing a 22% decline.

We believe that homeland security will have the greatest impact on three specific segments of the Federal Government IT market: information security, communications and knowledge management. We believe that the rapid pace of technological innovations and the Federal Government’s increasing reliance on complex IT infrastructure, combined with a decline in the size of the Federal Government workforce, as described above, make it increasingly difficult for many governmental agencies to operate and upgrade their IT systems. We expect that several trends will contribute to the Federal Government’s increased use of service providers to fulfill a larger portion of its iIT responsibilities, and we believe that we will continue to gain new engagements to the extent that the Federal Government increases its reliance on outsourcing for its IT needs. These trends include:

•                    The aging of the Federal Government’s workforce.  According to INPUT, the government has estimated that more than 45% of federal IT workers will be eligible for retirement by 2008, and the average age of Federal Government employees increased from 42 years of age in 1990 to 47 years of age in 2005. In April 2001, the GAO concluded in a report that the Federal Government’s human capital challenges are adversely affecting the ability of many agencies to carry out their missions.

•                    Increased Federal Government emphasis on competitive sourcing.  The current administration has made competitive sourcing a major initiative of its management agenda. According to the President’s Management Agenda, which was issued in 2001 and for which progress reports continue to be issued, including most recently during 2003, nearly half of all Federal Government employees perform tasks that are available in the commercial marketplace. To the extent that the size of the Federal Government workforce decreases, we believe that the Federal Government will have an increased need for entities that offer the technical skills, familiarity with government processes and procedures and skilled personnel that are necessary to meet the diverse IT requirements of the various Federal Government agencies.

Increased spending on homeland security and intelligence.

In the wake of the terrorist attacks on September 11, 2001, there has been an increased emphasis on homeland security, intelligence and national defense, including protecting critical infrastructure. According to INPUT, the total addressable IT budget for the Department of Homeland Security is projected to grow from $4.5 billion in government fiscal 2005 to $6.4 billion in government fiscal 2010, representing a compound annual growth rate of 7.6%.

Although the total amount to be spent for intelligence applications is classified, based on available information, INPUT has forecasted that the addressable Federal Government IT spending in the intelligence community may be as much as $7.8 billion in government fiscal 2005. We believe that there will continue to be increases in spending on federal intelligence activities, which are expected to represent significant additional opportunities for us.

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Increased simplicity of procurement.

Through changes that began with the Federal Acquisition Streamlining Act of 1994, or FASA 94, the federal government has developed a variety of accelerated contracting methods. Federal governmental agencies have increasingly been able to rely on multiple contracting vehicles to procure needed services in an expedient manner. According to INPUT, the average time to procure products and services was approximately 100 days in government fiscal 2004 as compared to 278 days in government fiscal 1995.

Our Core Strengths

We strategically built our business to respond specifically to the federal IT marketplace. We believe that our core strengths position us to respond to the long-term trends and changing demands of our market.

Our Experienced Management Team

On July 15, 2005, our Board of Directors approved a CEO succession plan, pursuant to which the Board appointed S. Bradford Antle, formerly our President and Chief Operating Officer, to be the next President and Chief Executive Officer (CEO) succeeding Ray J. Oleson, and to serve on our Board of Directors. Mr. Antle assumed these positions effective September 24, 2005. Mr. Antle, who joined us in 1999, brings more than 25 years of management experience in our industry to his new position. In addition to his new role as CEO and member of the Board, Mr. Antle retained the position of President. Ray Oleson continues to serve as Executive Chairman of the Board.

Additionally, to further support our growth during 2006 and beyond, our eight business units are now incorporated into the Strategic Programs Group, the IT Solutions Group, and the Mission Services Group. Each of these Business Groups is headed by an Executive Vice President, who reports to Mr. Antle.

Harry Gatanas is the Executive Vice President of the Strategic Programs Group, where he oversees a significant portion of our business with the DoD and the Intelligence community. Mr. Gatanas is a retired U.S. Army general with over 30 years of experience in the military and intelligence community, including serving as Commanding General of the U.S. Army White Sands Missile Range.

Marylynn Stowers is the Executive Vice President of the IT Solutions Group. She oversees a significant portion of business that addresses federal IT modernization. Ms. Stowers has more than 24 years of experience providing IT services to the Federal Government, such as Department of Homeland Security, Department of State, Department of Treasury, Internal Revenue Service, and the Intelligence community.

Mike Becraft is the Executive Vice President of the Mission Services Group. He is responsible for a major portion of work with the Deparment of Homeland Security, Department of State, and U.S. Army. Mr. Becraft has more than 37 years of Federal civilian government and military experience. He joined us in 2003 as Senior Vice President of Homeland Security.

Our Corporate Culture

Our corporate culture is based on respect for clients, personnel, business partners and management. We view our commitment to this culture of respect as a cornerstone of our company. We believe that our culture helps us build the relationships necessary to gain an in-depth understanding of our clients’ needs, business practices and information technology and network systems. In addition, we believe our culture is a factor in helping our employee turnover rate remain low compared to other companies in our industry, helping us to maintain client domain knowledge and provide consistent service to our clients. Further, we believe that our commitment to respect, combined with quality of performance, is an important factor in retaining clients and winning new referrals.

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Focus on Information Technology Services

We deliver a full spectrum of IT services and solutions that address challenges common to many Federal Government agencies and commercial companies. Our capabilities position us to capitalize on the Federal Government’s increasing demand for IT services. We integrate our technical areas of expertise into comprehensive solutions covering IT applications, systems engineering, network and telecommunications engineering and outsourcing. Our focus on end-to-end information technology solutions allows us to leverage our knowledge and experience to provide best practices across many Federal Government agencies and industries. Our key focus areas are:

•       Federal IT Modernization.  We define federal IT modernization to include designing, building and deploying solutions that enable our clients to replace legacy applications and databases and allow effective information sharing across agencies. We believe we have a proven track record of delivering true end-to-end solutions in this focus area that encompass application and software development, systems engineering, network solutions, and information security and performance support.

•       Defense Transformation.  We define defense transformation to include development of solutions intended to enable the U.S. military to successfully adapt to the requirements of net-centric warfare through our deep capabilities in space systems engineering, enterprise and operational architecture, command and control, logistics, and military satellite communications. In the area of space systems modernization, we are supporting clients such as Air Force Space Command, NORAD, Northern Command and U.S. Strategic Command.

•       Homeland Defense.  We define homeland defense as defense of the U.S. homeland, and includes the development of large scale replicated databases, secure optical calls processing and identification systems, managing records, and processing visas. We are working in this focus area to provide advanced information technology to assist in meeting this challenge for clients that include Department of Homeland Security, Department of State, Northern Command, Department of Energy, and Department of Agriculture.

•       Mission-Critical Outsourcing.  We define mission-critical outsourcing as assisting the Federal Government with shortages of personnel, including for the purpose of permitting re-assignment to higher priority government assignments, increasing operational efficiency, and improving the overall quality of service. We provide services in this focus area to both civilian agencies and the DoD.

Our skilled employees use their advanced technological training and extensive experience to implement our state-of-the-practice solutions. As of the end of fiscal year 2005, we employed over 4,000 employees, many of whom possess security clearances and National Agency Checks that allow us to bid on and perform classified work for the Federal Government.

Knowledge of Federal Government Contracting and Federal Agencies

We believe that our in-depth knowledge of Federal Government contracting and the governmental agencies we serve and their procurement processes allows us to provide better solutions for our clients’ needs. Our experienced team of executive officers and senior managers brings to us their many years of experience and extensive contacts in the industry. They provide us with an understanding of our clients’ needs and procedures, as well as valuable mission-specific information. We believe that the insight provided by our officers and managers allows us to design solutions that are responsive to our clients’ mission-critical needs.

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Successful Integration of Acquired Businesses

We believe that a critical component of our success is our ability to identify, acquire and integrate companies that build or expand our suite of services to serve our clients’ needs more effectively. Members of our management team have substantial experience acquiring and successfully integrating acquired entities. We believe that this experience provides a basis for our disciplined approach to identifying acquisition candidates and integrating acquired companies. By integrating corporate infrastructures such as marketing and sales, accounting, human resources and internal networks, we can save the expense of redundant functions. In addition, by integrating operations, we establish a corporate-wide mission which can reduce internal competition and promote the cross-selling of newly augmented skill sets to increase our client base.

Within the 15-month period from January 1999 through March 2000, we identified, acquired and integrated four federal IT companies with aggregate revenues of approximately $105 million, measured for the 12 months prior to their respective acquisition dates. In January, 2004, we acquired Matcom International Corporation, or Matcom; in December 2004, we acquired Bridge Technology Corporation, or Bridge; in February 2005, we acquired Shenandoah Electronic Intelligence, Inc., or SEI. We successfully integrated each of these acquisitions into our organization; and, we built and expanded our services and solutions capabilities and our client relationships. We applied our disciplined acquisition processes to integrate the acquired companies and successfully grew these businesses. On February 27, 2006, we acquired Zen, and we have commenced the integration process as we have done with our previous acquisitions.

Our Growth Strategy

We have implemented the following strategies in order to reach our goal of becoming a leading provider of information technology and network solutions to our clients:

•       Maintain and expand our existing client relationships.  We maintain relationships with our existing clients by adhering to our culture of respect and providing quality performance. We believe this helps us win renewals of our engagements. In addition, we use our knowledge of our clients’ needs to identify additional opportunities and cross-sell new services to them.

•       Leverage our existing client base to win new clients.  We believe satisfied clients are one of our most effective marketing tools. Since FASA 94 went into effect, client referrals have become a crucial component of expedited procurement processes and are key to our winning new contracts. Since we focus on technology infrastructure improvement, we are able to transfer our skills readily from client to client. We plan to continue building a network of clients and leveraging these relationships to gain access to new clients. We have launched a Major Programs initiative through which we intend to compete for large contracts over longer procurement periods. We believe that favorable client referrals are strategically important to our winning these opportunities.

•       Pursue strategic acquisitions.  We plan to continue utilizing our disciplined methodology to identify, evaluate and integrate strategic acquisitions. We have acquired and successfully integrated seven businesses since 1999 and we are in the process of integrating our eighth acquisition, Zen, which we acquired in February 2006. This acquisition has positioned us with strategically important technical skills in important client areas.

•       Business Capabilities and Sales Integration.  Our business units are now incorporated into the Strategic Programs Group, the IT Solutions Group, and the Mission Services Group. Under our new management structure (see above Our Experienced Management Team for more information about our management), these three business groups will be better able to present integrated solutions through the cross-marketing and delivery of our business capabilities to new and existing customers.

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Our Areas of Practice

We provide IT and network solutions in the following eight practice areas to supplement our clients needs in Defense Transformation, Homeland Defense, Mission Critical Outsourcing and Federal IT Modernization.

•       Program Management & Acquisition Support — The program management and acquisition support practice assists clients with initiating, assembling, executing, and managing all sizes of acquisition programs. The practice area provides acquisition strategies, government required documentation (DoD 5000), and solicitation packages, as well as, source selections and contract management support. The practice area manages and oversees high-tech systems development; interprets and synchronizes requirements with system architectures and integrated master plans; and, identifies and tracks technical and programmatic interdependencies and interactions among requirements. The technical staff is skilled in providing systems engineering technical assistance (SETA) support to client programs for cost, schedule, performance, risk management, and contracting activities.

•       Integrated Solutions Development — The integrated solutions development practice focuses on
the integration of commercial-off-the-shelf products with custom software engineering. Integrated solutions are deployed using structured Capability Maturity Model Integration (CMMI) practices to deliver services including feasibility studies and systems planning, enterprise architecture design, rapid prototype development, detailed systems design, implementation, independent verification and validation, testing, life-cycle documentation, and operations and maintenance. This practice area specializes in legacy systems migration to enterprise-wide applications, database-driven web applications (internet, extranet, and intranet), work flow systems implementation, enterprise portal development, enterprise-wide IT integrated services, mobile and wireless solutions, business intelligence (data warehouse and mining solutions) and Enterprice Resource Planning systems implementation.

•       Information Security — The information security practice delivers analyses, methods and technologies that enable clients to secure their information against unauthorized access and service disruption. The solutions are designed to protect and defend information systems against malicious actions, reduce the threat to system security and proactively manage risk. The practice area provides security policy and procedure development, threat determination and risk assessment, vulnerability analysis, system security engineering, network defense, secure document processing, applications and web security, security evaluation and accreditation and training.

•       Records Management — The records management practice specializes in application processing, data entry, case and file management, large scale identification and credentialing systems, call center support, and analytical support services. The practice area services include the management and operation of integrated file tracking systems, electronic records management, large volume file processing, secure identity card production, scanning operations to include documents and biometrics, storing and shipping of documents, quality control audits, secure file destruction, and network installation.

•       Learning Solutions — The learning solutions practice focuses on the design, development and delivery of learning and performance interventions to meet the client’s individual and organizational performance needs and manage change. The practice area provides front end analysis, blended solutions, web-based and instructor-led training, electronic performance support systems (EPSS), human performance design, and learning standards and learning infrastructure consulting. Our understanding and experience in the distance learning, e-Learning, and ever changing Learning Management Systems/Learning Content Manangement Systems environments provides our clients rapid design and deployment of solution-based programs to meet today’s requirements and tomorrow’s challenges.

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•       Systems Engineering — The systems engineering practice delivers mission and requirements analysis, enterprise/operational architecture modeling and development, system application and development, system design, validation and verification, integrated logistics support, life cycle engineering, and complex simulation. The technical staff is skilled in command, control, communications, computer and intelligence (C4I), engineering, object oriented analysis and design, system testing, requirements traceability and specialty disciplines, including reliability/maintainability/availability engineering and safety and sustaining engineering. Many of these skills are focused on military space applications.

•       Network Solutions — The network solutions practice designs, engineers, deploys, and manages a full range of networked communications and infrastructure solutions. The practice area provides IT and network requirements, definition and analysis, detailed systems design, network and technology selection and procurement, global end-to-end installation, and spectrum/bandwidth management. These solutions encompass voice, video, data, narrowband, broadband and wireless technologies. Applications include large scale enterprise networks for government, highly secure networks.

•       Mission-critical Outsouring — The mission-critical outsouring practice uses domain expertise to operate clients’ systems and processes vital to their businesses. The practice area offers professional services to perform business process and information technology outsourcing, sustaining engineering, logistics services, and call center operations.

Clients

We provide our services primarily to Federal Government clients such as the U.S. Air Force Space Command, the U.S. Army, U.S. Navy, the Department of State, the Department of Homeland Security, Department of Agriculture, National Institutes of Health, Federal Retirement Thrift Investment Board, and the defense intelligence community. In fiscal 2005, we derived approximately 98% of our total revenue from Federal Governmental agencies and approximately 2% of our total revenue from commercial clients.

Our largest client is the DoD. We derived approximately 47% of our total revenue in fiscal 2005 and approximately 53% of our total revenue in fiscal 2004 from the DoD and the Intelligence community. In fiscal 2005 and fiscal 2004, services we provided to the U.S. Air Force Space Command represented 23% and 26% of our total revenue, respectively. We also derived approximately 12% of our fiscal 2005 and 2004 revenue, respectively, from the Department of State. Each of these entities consists of a substantial number of separate offices, each of which typically exercises independent decision making and funding authority. We believe our contract base among these separate offices is well diversified. In fiscal 2005 and fiscal 2004, we derived approximately 75% and 81%, respectively, of our revenue from contracts on which we acted as prime contractor and derived approximately 25% and 19%, respectively, of our revenue from contracts on which we acted as a subcontractor.

We often subcontract portions of work to be performed under a contract or task order under which we are the prime contractor. Approximately 15% and 16%, respectively, of our total revenue in fiscal 2005 and fiscal 2004, respectively, was generated by work performed by subcontractors. The subcontractors are sometimes responsible for critical portions of the contracted services. Our subcontracting arrangements typically specify that all terms of the primary contract pass down to the subcontractor. We are not dependent upon any one subcontractor or group of subcontractors to provide a substantial degree of work for us. In addition, it is typical that a subcontractor on one engagement may be a competitor or a client in other situations. We believe that cultivating good relationships with our subcontractors is necessary to maintain our competitive position as well as to facilitate meeting performance obligations under our contracts.

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Backlog

Backlog is our estimate of the amount of revenue we expect to realize over the remaining life of awarded contracts and task orders we have in hand as of the measurement date. Our total backlog consists of funded and unfunded backlog. We define funded backlog as estimated future revenue under government contracts and task orders for which funding has been appropriated by Congress and authorized for expenditure by the applicable agency, plus our estimate of the future revenue we expect to realize from our commercial contracts. Unfunded backlog is the difference between total backlog and funded backlog. Unfunded backlog reflects our estimate of future revenue under awarded government contracts and task orders for which either funding has not yet been appropriated or expenditure has not yet been authorized. Our total backlog does not include estimates of revenue from government-wide acquisition contracts, or GWAC contracts, or General Services Administration, or GSA, schedules beyond awarded or funded task orders, but our unfunded backlog does include estimates of revenue beyond awarded or funded task orders for other types of indefinite delivery, indefinite quantity, or ID/IQ, contracts, such as our contract with the U.S. Air Force Space Command.

Our total backlog as of December 31, 2005 was approximately $854 million, of which approximately $191 million was funded. There can be no assurance that we will receive the amounts we have included in our backlog or that we will ultimately recognize the full amount of our funded backlog as of December 31, 2005.

As of December 31, 2005, assuming that the acquisition of Zen had occurred on such date, our backlog was approximately $994 million, of which $233 million was funded.

We believe that backlog is not necessarily indicative of the future revenue that we will actually receive from contract awards that are included in calculating our backlog. We assess the potential value of contracts for purposes of backlog based upon several subjective factors. These subjective factors include our judgments regarding historical trends (i.e., how much revenue we have received from similar contracts in the past), competition (i.e., how likely are we to successfully keep all parts of the work to be performed under the contract) and budget availability (i.e., how likely is it that the entire contract will receive the necessary funding). If we do not accurately assess each of these factors, or if we do not include all of the variables that affect the revenue that we recognize from our contracts, the potential value of our contracts, and accordingly, our backlog, will not reflect the actual revenue received from contracts and task orders. As a result, there can be no assurance that we will receive amounts included in our backlog or that monies will be appropriated by Congress or otherwise made available to finance contracts and task orders included in our backlog. Many factors that affect the scheduling of projects could alter the actual timing of revenue on projects included in backlog. There is always the possibility that the contracts could be adjusted or cancelled. We adjust our backlog on a quarterly basis to reflect modifications to or renewals of existing contracts, awards of new contracts or approvals of expenditures. See Item 1A. “Risk Factors—The calculation of our backlog is subject to numerous uncertainties, and we may not receive the full amounts of revenue estimated under the contracts included in our backlog, which could reduce our revenue in future periods.”

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Employees

As of December 31, 2005, we had over 4,000 employees. Approximately 85% of our employees hold Federal Government security clearances or have passed National Agency Checks. Approximately 15% of our employees hold Top Secret security clearances. A significant portion of our employees who hold Top Secret security clearances also hold Sensitive Compartmental Information clearances, which permit us to bid on highly classified projects. We have no unionized employees and do not have any collective bargaining agreements. However, current contracts or contracts that we may pursue contracts may require us to have unionized employees. Furthermore, with our acquisition of Zen, we have added approximately 275 employees, of which 50% hold security clearances. We believe we have a good relationship with our employees.

In addition to attracting and retaining qualified technical personnel, we believe that our success will depend on the continued employment of our executive and senior management team and its ability to generate new business and execute projects successfully. We believe that the personal reputations of our management team members and the business relationships between individual members of our management team and governmental officials involved in the procurement process and related areas are critical elements of obtaining and maintaining client engagements in our industry, particularly with agencies performing classified operations. To create and maintain these client relationships, identify potential business opportunities and establish our reputation among our current and potential clients, we depend on our senior management team. The loss of any of our senior executives could cause us to lose client relationships or new business opportunities, which could materially adversely affect our business.

Competition

We operate in markets that are highly competitive and include a large number of participants. We compete with many companies, both large and small, for our contracts. We do not have a consistent number of competitors against whom we repeatedly compete. If we anticipate that our combined resources may create a competitive advantage, we may team with other companies to perform work under contracts. These and other companies in our market may compete more effectively than we can because they are larger, have greater financial and other resources, have better or more extensive relationships with governmental officials involved in the procurement process and have greater brand or name recognition.

As a result of the diverse requirements of the Federal Government and our commercial clients, we frequently form teams with the companies in our markets in order to compete for large procurements, while bidding against them in other situations.

In each of our practice areas, we generally bid against companies of varying sizes and specialties, from small businesses to multi-billion dollar corporations. Because of the current industry trend toward consolidation, some of these companies may emerge better able to compete with us. Therefore, it is essential that we differentiate ourselves from these companies. We believe that our technical abilities, client relationships, past performance, cost containment, reputation and ability to provide quality personnel give us a strong presence in the markets we serve. In addition, we believe that our culture of respect for and commitment to our clients and business partners greatly aids our business. While we believe these factors help to set us apart from other companies in our markets, we may not be able to continue to maintain our competitive position, as new companies enter the marketplace and alliances and consolidations among competitors emerge. Some companies in our markets have longer operating histories, greater financial and technological capabilities, greater brand or name recognition and/or larger client bases than we have.

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Government Contracting and Regulatory Processes

For fiscal 2005, approximately 98% of our revenue was derived from work performed under Federal Government contracts. The government contracting process differs in many ways from commercial contracting, and involves a high degree of Federal Government regulation and oversight.

Historically, agencies of the Federal Government wishing to procure services from contractors have been required to prepare a request for proposal, known as an RFP, or some similar form of solicitation. The RFP is typically an extensive document describing the services desired and the terms and conditions that form the final agreement, including the criteria the soliciting agency will use to select the service provider. Interested parties submit proposals in response to the RFP, which the agency evaluate, often requesting additional information and multiple discussions with offerors prior to final award of the contract.

In recent years, the Federal Government has taken steps to streamline the procurement process. For example, in 1994, the enactment of FASA 94 made the procurement process substantially faster and less burdensome for companies that secure certain contracts. FASA 94 was the first of several statutory and regulatory changes in recent years that significantly altered government procurement practices by increasing the number and types of procurement contract “vehicles” available to Federal Government clients to satisfy their requirements. Federal Governmental agencies are now more likely to use flexible contract vehicles that permit a number of firms to compete for specific orders. The General Services Administration Multiple Award Schedule Program, or GSA MAS Program, is an example of a flexible contract vehicle employed by the Federal Government. Under the GSA MAS Program, GSA contracts with multiple vendors to provide goods and services, at predetermined prices, to specified authorized buyers. GSA schedules are listings of services and products, along with their respective prices, offered by approved contractors. The schedules are maintained by the GSA for use by any federal agency or other authorized entity. A contractor must successfully complete a pre-qualification process in order to be selected by the GSA for inclusion of the contractor’s goods or services on a GSA Schedule. When an agency selects services under a GSA schedule contract, the soliciting agency, or the GSA on its behalf, conducts a bidding process, limited to qualified GSA schedule contractors. The process typically involves substantially less time and cost than the historical, non-GSA bidding process.

In addition to the GSA MAS Program, we also hold other ID/IQ contracts with other individual agencies, which are generally known as task order contracts. These are essentially umbrella contracts that set forth the basic terms and conditions under which the agency may order goods and services from one, and in some cases, more than one, contractor. Contractors undergo a competitive pre-selection process to become eligible to perform work under ID/IQ contracts. A procuring agency then issues task orders for goods or services to be performed or provided under a contract. When task orders are issued under multiple award ID/IQ contracts, each awardee typically has an opportunity to be considered for the task order. The agency desiring contract services may conduct a competition among the interested awardees, resulting in the issuance of a task order to a single contractor. These contracts have increased competition and pricing pressure by concentrating work under fewer contracts, and requiring competition both prior to the initial award of the contract and throughout the term of the contract in order to obtain task orders for the services we provide, requiring that we make sustained post-award marketing efforts to realize revenue under each such contract. Moreover, even if we are qualified to work on a particular new contract or a contract subject to renewal, we might not be awarded business because of the Federal Government’s policy and practice of procuring goods and services from multiple contractors in order to maintain a diverse base of contractors. In addition, ID/IQ contracts do not obligate the Federal Government to purchase goods or services above the minimum levels set forth in the contract.

A task order calls for a specific set of services to be delivered by the contractor to a particular client agency. In our experience, the key factors in competing successfully for these task orders are technical

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merit, cost, relevant past performance considerations and client trust. From time to time we are also party to GWACs, which are ID/IQ contracts that permit the aggregation of multiple agencies’ requirements in a single contract, in order to encourage contractors to offer the best possible prices and to reduce the costs associated with multiple acquisitions.

For single-award large scale contracts, such as those targeted by our Major Program initiative, interested contractors submit information indicating their desire to perform the required services. The agency then solicits competitive proposals or bids from qualified contractors by providing them with a formal RFP or similar solicitation. The RFP typically describes the desired services, terms and conditions, and evaluation criteria the agency will use. Offerors then submit proposals in response to the RFP, and the agency evaluates the proposals and makes the award determination. Agencies are encouraged to award contracts on a “best value” basis. This means that the contractor selected for the award should, in the agency’s judgment, provide the greatest overall benefit in response to the requirement, including technical merit, cost and relevant past performance considerations. The entire acquisition process can sometimes take a year or more.

The competitive process presents a number of risks, including the following:

•       we expend substantial funds, managerial time and effort to prepare bids and proposals for contracts that we may not win;

•       we may be unable to estimate accurately the resources and cost that will be required to service any contract we win, which could result in substantial cost overruns; and

•       we may encounter expense and delay if our competitors protest or challenge awards of contracts to us in competitive bidding, and any such protest or challenge could result in a requirement to resubmit proposals on modified specifications or in the termination, reduction or modification of the awarded contract.

•       we may be choosen as one of the contractors for a multiple awared GWAC, ID/IQ or GSA Schedule contract, but not be awarded a sufficient number of tasks under the contract to justify our time, effort, and expense in bidding on the contract and subsequent task orders.

•       the government may intitially award a GWAC, ID/IQ, or GSA Schedule contract but fail to provide funding for the number of task orders necessary to justify our time, effort, and expense in bidding on the contract and subsequent task orders.

The government contracts for which we compete typically have multiple year terms, and if we are unable to win a particular contract, we generally will be foreclosed from competing again for that contract until its expiration several years later. In addition, upon the expiration of a contract, if the client requires further services of the type provided by the contract, there is frequently a competitive rebidding process.

Laws and Regulations Affecting Our Business

Federal Government contracts are subject to a number of federal laws and regulations, including the Federal Acquisition Regulation, or FAR, and Cost Accounting Standards. These statutes and regulations contain several rules that may affect us significantly.

The Anti-Deficiency Act prohibits Federal Government employees from committing government funds, by contract or otherwise, in excess or in advance of appropriations, unless authorized by a specific statute. Since Congress usually appropriates funds on a fiscal year basis, many of our contracts are funded by the applicable agency annually as Congress makes appropriations for future fiscal years. In addition, since funds are often allocated to agencies by the OMB, many of our contracts are incrementally funded.

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Disappointed bidders and contractors excluded from competing for government contracts and task orders may submit a protest to a contracting officer or the GAO within time limits specified under FAR and GAO bid protest rules. The U.S. Court of Federal Claims also has bid protest jurisdiction. Performance under a contract being protested may be suspended while the protest is pending, and in cases where the contract is found to have been improperly awarded, the contract may be terminated.

Certain FAR clauses, such as the Limitation of Cost and Limitation of Funds clauses, limit the Federal Government’s liability for expenditures or obligations beyond those authorized by the applicable contract. In many cases, contracts are awarded for only one year with a number of successive option years (in many cases, four). Agencies are not obligated to exercise these option years, but in our experience most renewal options under our contracts have been exercised. In addition, certain FAR clauses allow the Federal Government to terminate contracts for convenience (i.e., at will), although the Federal Government is obligated to pay for costs incurred.

Larger contracts may also be subject to the Truth in Negotiations Act and Cost Accounting Standards. The Truth in Negotiations Act requires us to provide current, accurate and complete cost or pricing data in connection with the negotiation of a contract, modification or task order that is not subject to full and open competition or other exceptions to the Act. Cost Accounting Standards are applicable to certain contracts and require the contractor to apply consistent accounting practices and comply with specific cost accounting criteria. The FAR “Contract Cost Principles and Procedures” sets forth the rules regarding the allocability and allowability of costs incurred in connection with Federal Government contracts.

The FAR restricts government contractors from participating in procurements when there is an Organizational Conflict of Interest, or OCI, and establishes rules for avoiding, mitigating and neutralizing conflicts of interest in the issuance of contracts by the Federal Government. Virtually all government contracts, including ours, are subject to the OCI rules. An OCI may arise because the nature of the work to be performed by a contractor has the potential, absent some restriction on future activities, to result in an unfair competitive advantage to the contractor or impair the contractor’s objectivity in performing the contract or providing assistance or advice to the Federal Government. The government contracting officer is responsible for resolving any significant potential OCIs before a contract award is made. Federal Government contractors have an obligation to manage and, if necessary, report an OCI to the contracting officer. We have a company-wide policy regarding care in the acceptance of and compliance with contractual OCI provisions, which includes awareness training programs and coordination and reporting systems. We review new contracts and task orders at the time we receive them for potential OCI issues. Accordingly, we believe that as a result of the systems we have in place, our backlog will not be affected by OCI issues.

Our books and records are subject to audit by the Defense Contract Audit Agency, or DCAA, and other governmental audit agencies to ensure that the costs and hourly rates for which we invoice the Federal Government under cost reimbursable and time and materials contracts are in compliance with the Cost Principles, Cost Accounting Standards and FAR invoicing regulations. Each fiscal year, we must submit final cost data to the Federal Government indicating our actual costs incurred for the prior year, exclusive of certain costs that are not recoverable by Federal Government contractors. This data is audited, and subject to adjustments by the auditing agency based upon established guidance, which may affect our recovery on cost reimbursable contracts for prior fiscal years. These audits may also result in assessment of penalties, interest costs and, in extreme cases, debarment. The Federal Government retains a portion of the fee earned by us under cost reimbursable contracts until contract completion and audit by the DCAA. Audits of our business units by the DCAA have been completed for all fiscal years through 2001 without material adjustments. In the opinion of management, the audits for other fiscal years through fiscal year 2005 will not result in adjustments that would have a material adverse effect on our financial position or results of operations; however, future material adjustments are possible.

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Our conduct and performance is also subject to the False Claims Act. The False Claims Act prohibits contractors from knowingly submitting false or fraudulent claims to the Federal Government. We have established standards of conduct for our employees and a reporting mechanism that any of our employees can use to report inappropriate or illegal activities.

From time to time we may engage in activities that require us to comply with the various, U.S. Government export control laws and regulations administered by the U.S. Department of State, U.S. Department of Commerce, U.S. Treasury Office of Foreign Assets Control, and the Bureau of Customs and Boarder Protection. We have dedicated personal assigned to maintain and coordinate our compliance activities in this area.

Copies of our Annual Report on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K, and amendments to those reports filed or furnished pursuant to Section 13(a) or 15(d) of the Exchange Act of 1934, as amended, are available free of charge on the Investor Relations section of our website at www.si-intl.com as soon as reasonably practicable after we electronically file the material with, or furnish the material to, the Securities and Exchange Commission, or SEC.

You may obtain a printed copy of any of the foregoing materials from us by writing to us at SI International, Inc., 12012 Sunset Hills Road, Suite 800, Reston, Virginia 20190, Attention: Investor Relations.

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Item 1A. Risk Factors

Risks Related to Our Industry

We depend on contracts with the Federal Government for most of our revenue, and our business would be seriously harmed if the government ceased doing business with us or significantly decreased the amount of business it does with us.

We derived 98.1% and 96.6% of our total revenue in fiscal 2005 and in fiscal 2004, respectively, from Federal Government contracts, either as a prime contractor or a subcontractor. This includes 46.9% and 52.8% of our total revenue in fiscal 2005 and in fiscal 2004, respectively, that we derived, either as a prime contractor or a subcontractor, from contracts with agencies of the DoD and Intelligence community. We expect that we will continue to derive most of our revenue for the foreseeable future from work performed under Federal Government contracts. If we were suspended or otherwise prohibited from contracting with the Federal Government generally, or with any significant agency of the DoD or the Intelligence community, or if our reputation or relationship with the Federal Government or any significant agency of the DoD or the Intelligence community were impaired, or if any of the foregoing otherwise ceased doing business with us or significantly decreased the amount of business it does with us, our business, prospects, financial condition and operating results would be materially adversely affected.

The following chart provides certain information regarding our two largest contracts for fiscal year 2005, in terms of revenues:

* Includes option periods.

Our business could be adversely affected by changes in budgetary priorities of the Federal Government.

Because we derive a significant portion of our revenue from contracts with the Federal Government, we believe that the success and development of our business will continue to depend on our successful participation in Federal Government contract programs. Changes in Federal Government budgetary priorities could directly affect our financial performance. A significant decline in government expenditures, a shift of expenditures away from programs that call for the types of services that we provide, or a change in Federal Government contracting policies could cause Federal Governmental agencies to reduce their expenditures under contracts, to exercise their right to terminate contracts at any time without penalty, not to exercise options to extend contracts, or to delay or not enter into new contracts. Any of those actions could seriously harm our business, prospects, financial condition or operating results. Moreover, although our contracts with governmental agencies often contemplate that our services will be performed over a period of several years, Congress usually must approve funds for a given program each government fiscal year and may significantly reduce or eliminate funding for a program. Significant reductions in these appropriations by Congress could have a material adverse effect on our business. Additional factors that could have a serious adverse effect on our Federal Government contracting business include:

•       changes in Federal Government programs or requirements;

•       budgetary priorities limiting or delaying Federal Government spending generally, or by specific departments or agencies in particular, and changes in fiscal policies or available funding, including potential governmental shutdowns;

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•       reduction in the Federal Government’s use of technology solutions firms; and

•       an increase in the number of contracts reserved for small businesses which could result in our inability to compete directly for these prime contracts.

Our contracts with the Federal Government may be terminated or adversely modified prior to completion, which could adversely affect our business.

Federal Government contracts generally contain provisions, and are subject to laws and regulations, that give the Federal Government rights and remedies not typically found in commercial contracts, including provisions permitting the Federal Government to:

•       terminate our existing contracts;

•       reduce potential future income from our existing contracts;

•       modify some of the terms and conditions in our existing contracts;

•       suspend or permanently prohibit us from doing business with the Federal Government or with any specific government agency;

•       impose fines and penalties;

•       subject us to criminal prosecution;

•       subject the award of some contracts to protest or challenge by competitors, which may require the contracting federal agency or department to suspend our performance pending the outcome of the protest or challenge and which may also require the government to solicit new proposals for the contract or result in the termination, reduction or modification of the awarded contract;

•       suspend work under existing multiple year contracts and related task orders if the necessary funds are not appropriated by Congress;

•       decline to exercise an option to extend an existing multiple year contract; and

•       claim rights in technologies and systems invented, developed or produced by us.

The Federal Government may terminate a contract with us either “for convenience” (for instance, due to a change in its perceived needs or its desire to consolidate work under another contract) or if we default by failing to perform under the contract. If the Federal Government terminates a contract with us for convenience, we generally would be entitled to recover only our incurred or committed costs, settlement expenses and profit on the work completed prior to termination. If the Federal Government terminates a contract with us based upon our default, we generally would be denied any recovery for undelivered work, and instead may be liable for excess costs incurred by the Federal Government in procuring undelivered items from an alternative source and other damages as authorized by law. As is common with government contractors, we have experienced and continue to experience occasional performance issues under some of our contracts. We may in the future receive show-cause or cure notices under contracts that, if not addressed to the Federal Government’s satisfaction, could give the government the right to terminate those contracts for default or to cease procuring our services under those contracts.

Our Federal Government contracts typically have terms of one or more base years and one or more option years. Many of the option periods cover more than half of the contract’s potential term. Federal governmental agencies generally have the right not to exercise options to extend a contract. A decision to terminate or not to exercise options to extend our existing contracts could have a material adverse effect on our business, prospects, financial condition and results of operations.

Certain of our Federal Government contracts also contain “organizational conflict of interest” clauses that could limit our ability to compete for certain related follow-on contracts. For example, when we work

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on the design of a particular solution, we may be precluded from competing for the contract to install that solution. While we actively monitor our contracts to avoid these conflicts, we cannot guarantee that we will be able to avoid all organizational conflict of interest issues.

If we fail to establish and maintain important relationships with government entities and agencies, our ability to successfully bid for new business may be adversely affected.

To develop new business opportunities, we primarily rely on establishing and maintaining relationships with various government entities and agencies. We may be unable to successfully maintain our relationships with government entities and agencies, and any failure to do so could materially adversely affect our ability to compete successfully for new business.

We derive significant revenue from contracts and task orders awarded through a competitive acquisition process. If we are unable to win new awards or successfully compete for renewal contracts, our business and prospects may be adversely affected.

A significant number of our contracts and task orders with the Federal Government are awarded through a competitive process. We expect that much of the business that we will seek in the foreseeable future will continue to be awarded through competitive bidding of new contracts and task orders and contracts subject to renewal. Recently, members of Congress and administration officials have authorized changes to the procurement process intended to increase competition among suppliers to the Federal Government. Budgetary pressures and reforms in the procurement process have caused many Federal Government clients to increasingly purchase goods and services through ID/IQ, contracts, including GSA contracts, and other GWACs. These contracts have increased competition and pricing pressure by concentrating work under fewer contracts, and requiring competition both prior to the initial award of the contract and throughout the term of the contract in order to obtain task orders for the services we provide, requiring that we make sustained post-award marketing efforts to realize revenue under each such contract. These contracts generally approve particular contractors to provide specified goods and services to the applicable governmental agency but generally do not obligate the agency to purchase any particular amount of goods or services. To procure goods or services under the contract, the agency generally awards task orders to perform specified services or to supply specified goods pursuant to competition among approved contractors. Thus, the existence of a contract does not ensure future revenue; rather, the contract merely provides us the opportunity to compete for additional work. An agency may administer an ID/IQ contract in which it procures goods and services for itself. Under the same contract, other federal agencies may also procure goods and services. These contracts are known as GWACs. When multiple prime contractors hold GWACs for the same goods and services, all of them are eligible to supply goods and services under the contract. As a result, qualified contractors often compete with each other to obtain task orders under a GWAC. Similarly, GSA contracts, including contracts commonly known as GSA Schedule contracts, are procurement contracts administered by the GSA on behalf of the entire Federal Government. Like many other ID/IQ contracts, multiple contractors may be awarded GSA contracts for the same goods and services. As a result, an agency may procure goods and services from any contractor awarded the GSA contract at the prices and on the terms stated in the contract. Moreover, even if we are highly qualified to work on a particular new contract or a contract subject to renewal, we might not be awarded business because of the Federal Government’s policy and practice of procuring goods and services from multiple contractors in order to maintain a diverse base of contractors.

The competitive process presents a number of risks, including the following:

•  we expend substantial funds, managerial time and effort to prepare bids and proposals for contracts that we may not win;

•  we may be unable to estimate accurately the resources and cost that will be required to service any contract we win, which could result in substantial cost overruns; and

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•  we may encounter expense and delay if our competitors protest or challenge awards of contracts to us in competitive bidding, and any such protest or challenge could result in a requirement to resubmit proposals on modified specifications or in the termination, reduction or modification of the awarded contract.

The government contracts for which we compete typically have multiple year terms, and if we are unable to win a particular contract, we generally will be foreclosed from competing again for that contract until its expiration several years later. If we are unable to win new contract awards, our business and prospects will be adversely affected. In addition, upon the expiration of a contract, if the client requires further services of the type provided by the contract, there is frequently a competitive rebidding process. Approximately 19.5% of our revenue recognized during fiscal 2005 was derived from contracts that, as of February 28, 2006, are, or are expected to become, subject to recompetition bids prior to the end of government fiscal 2006 (ending September 30, 2006). There can be no assurance that we will win any particular bid or recompetition bid, or that we will be able to replace business lost upon expiration or completion of a contract, and the termination or nonrenewal of any of our significant contracts or a substantial portion of our other contracts could materially adversely affect our operating results.

Our business may suffer if our facilities or our employees are unable to obtain or retain the security clearances or other qualifications needed to perform services for our clients.

Many of our Federal Government contracts require employees and facilities used in specific engagements to hold security clearances and to clear agency checks and Defense Security Service checks. Many of our contracts require us to employ personnel with specified levels of education, work experience and security clearances. Depending on the level of clearance, security clearances can be difficult and time-consuming to obtain. If our employees or our facilities lose or are unable to obtain necessary security clearances or successfully clear necessary agency or Defense Security Service checks, we may not be able to win new business and our existing clients could terminate their contracts with us or decide not to renew them. To the extent we cannot obtain or maintain the security clearances necessary for our facilities or our employees working on a particular contract or to the extent our facilities or our employees do not successfully clear necessary agency checks or Defense Security Service checks, we may not derive the revenue anticipated from the contract, and our operating results could be materially adversely affected.

We must comply with a variety of laws, regulations and procedures and our failure to comply could harm our operating results.

We must observe laws and regulations relating to the formation, administration and performance of Federal Government contracts which affect how we do business with our clients and impose added costs on our business. For example, the Federal Acquisition Regulation and the industrial security regulations of the Department of Defense and related laws include provisions that:

•  allow our Federal Government clients to terminate or not renew our contracts if we come under foreign ownership, control or influence;

•  require us to disclose and certify cost and pricing data in connection with contract negotiations;

•  require us to prevent unauthorized access to classified information; and

•  require us to comply with laws and regulations intended to promote various social or economic goals.

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Some of our activities are subject to the export control laws and regulations administered by the Department of State, Department of Commerce, Treasury Office of Foreign Assets Control, and the Bureau of Customs and Boarder Protection Additionally, we are subject to industrial security regulations of the DoD and other federal agencies that are designed to safeguard against foreigners’ access to classified information. If we were to come under foreign ownership, control or influence, we could lose our facility security clearances, which could result in our Federal Government customers terminating or deciding not to renew our contracts, and could impair our ability to obtain new contracts.

In addition, our employees often must comply with procedures required by the specific agency for which work is being performed, such as time recordation or prohibition on removal of materials from a location.

Our failure to comply with applicable laws, regulations or procedures, including federal procurement regulations and regulations regarding the protection of classified information, could result in contract termination, loss of security clearances, suspension or prohibition from contracting with the Federal Government, civil fines and damages and criminal prosecution and penalties, any of which could materially adversely affect our business.

The Federal Government may revise its procurement or other practices in a manner adverse to us.

The Federal Government may revise its procurement practices or adopt new contracting rules and regulations, such as cost accounting standards. It could also adopt new contracting methods relating to GSA contracts, GWACs or other government-wide contracts, or adopt new standards for contract awards intended to achieve certain social or other policy objectives, such as establishing new set-aside programs for small or minority-owned businesses. In addition, the Federal Government may face restrictions from new legislation or regulations, as well as pressure from government employees and their unions, on the nature and amount of services the Federal Government may obtain from private contractors. These changes could impair our ability to obtain new contracts or contracts under which we currently perform when those contracts are put up for recompetition bids. Any new contracting methods could be costly or administratively difficult for us to implement, and, as a result, could harm our operating results. For example, the Truthfulness, Responsibility and Accountability in Contracting Act, proposed in 2001, would have limited and severely delayed the Federal Government’s ability to use private service contractors. Although this proposal was not enacted, it or similar legislation could be proposed at any time. Any reduction in the Federal Government’s use of private contractors to provide federal information technology services could materially adversely impact our business.

Our contracts and administrative processes and systems are subject to audits and cost adjustments by the Federal Government, which could reduce our revenue, disrupt our business or otherwise adversely affect our results of operations.

Federal governmental agencies, including the DCAA, routinely audit and investigate government contracts and government contractors’ administrative processes and systems. These agencies review our performance on contracts, pricing practices and cost structure. They also review our compliance with applicable laws, government regulations, policies and standards and the adequacy of our internal control systems and policies, including our purchasing, property, estimating, compensation and management information systems. Any costs found to be improperly allocated to a specific contract will not be reimbursed, and any such costs already reimbursed must be refunded. Moreover, if any of our administrative processes and systems are found not to comply with the applicable requirements, we may be subjected to increased government scrutiny or required to obtain additional governmental approvals that could delay or otherwise adversely affect our ability to compete for or perform contracts. Therefore, an unfavorable outcome to an audit by the DCAA or another government agency, such as the Defense Security Service, or DSS, which verifies security compliance, could materially adversely affect our

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competitive position and result in a substantial reduction of our revenues. If a government investigation uncovers improper or illegal activities, we may be subject to civil and criminal penalties and administrative sanctions, including termination of contracts, forfeitures of profits, suspension of payments, fines and suspension or debarment from doing business with the Federal Government. In addition, we could suffer serious reputational harm if allegations of impropriety were made against us.

Failure to maintain strong relationships with other government contractors could result in a decline in our revenue.

We derived 24.6% of our total revenue in fiscal 2005 and 19.4% of our total revenue in fiscal 2004 from contracts under which we acted as a subcontractor or from “teaming” arrangements in which we and other contractors bid together on particular contracts or programs. As a subcontractor or team member, we often lack control over fulfillment of a contract, and poor performance on the contract could tarnish our reputation, even when we perform as required. We expect to continue to depend on relationships with other contractors for a portion of our revenue in the foreseeable future. Moreover, our revenue and operating results could be materially adversely affected if any prime contractor or teammate chooses to offer a client services of the type that we provide or if any prime contractor or teammate teams with other companies to independently provide those services.

The calculation of our backlog is subject to numerous uncertainties, and we may not receive the full amounts of revenue estimated under the contracts included in our backlog, which could reduce our revenue in future periods.

Backlog is our estimate of the amount of revenue we expect to realize over the remaining life of the awarded contracts and task orders we have in hand as of the measurement date. Our total backlog consists of funded and unfunded backlog. We define funded backlog as estimated future revenues under government contracts and task orders for which funding has been appropriated by Congress and authorized for expenditure by the applicable agency under our contracts, plus estimated future revenues we expect to receive under signed purchase orders with commercial clients. Unfunded backlog is the difference between total backlog and funded backlog. Unfunded backlog reflects our estimate of future revenues under awarded government contracts and task orders for which either funding has not been appropriated or expenditures have not been authorized. Our total backlog does not include estimates of revenue from GWAC or GSA schedules beyond contract or task order awards, but our unfunded backlog does include estimates of revenue beyond contract or task order awards for other types of ID/IQ contracts, including our Command, Control, Communications, Computer, Intelligence, Information, Technology, Surveillance, and Reconnaissance (C4I2TSR) contract with the U.S. Air Force Space Command.

The calculation of backlog is highly subjective and is subject to numerous uncertainties and estimates, and there can be no assurance that we will in fact receive the amounts we have included in our backlog. Our assessment of a contract’s potential value is based upon factors such as historical trends, competition and budget availability. In the case of contracts which may be renewed at the option of the applicable agency, we generally calculate backlog by assuming that the agency will exercise all of its renewal options; however, the applicable agency may elect not to exercise its renewal options. In addition, federal contracts typically are only partially funded at any point during their term, and all or some of the work to be performed under a contract may remain unfunded unless and until Congress makes subsequent appropriations and the procuring agency allocates funding to the contract. Our estimate of the portion of backlog from which we expect to recognize revenues in fiscal 2005 or any future period is likely to be inaccurate because the receipt and timing of any of these revenues is dependent upon subsequent appropriation and allocation of funding and is subject to various contingencies, such as timing of task orders, many of which are beyond our control. In addition, we may never receive revenues from some of the engagements that are included in our backlog and this risk is greater with respect to unfunded backlog.

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The actual receipt of revenues on engagements included in backlog may never occur or may change because a program schedule could change, the program could be canceled, the governmental agency could elect not to exercise renewal options under a contract or could select other contractors to perform services, or a contract could be reduced, modified or terminated. We adjust our backlog on a quarterly basis to reflect modifications to or renewals of existing contracts or task orders, awards of new contracts or task orders, or approvals of expenditures. Additionally, the maximum contract value specified under a government contract or task order awarded to us is not necessarily indicative of the revenues that we will realize under that contract. We also derive revenues from ID/IQ contracts, which typically do not require the government to purchase a specific amount of goods or services under the contract other than a minimum quantity which is generally very small. If we fail to realize revenue included in our backlog, our revenues and operating results for the then current fiscal year as well as future reporting periods could be materially adversely affected.

Loss of our GSA contracts or GWACs would impair our ability to attract new business.

We are a prime contractor under several GSA contracts and GWAC schedule contracts. We believe that our ability to continue to provide services under these contracts will continue to be important to our business because of the multiple opportunities for new engagements each contract provides. If we were to lose our position as prime contractor on one or more of these contracts, we could lose substantial revenues and our operating results could suffer. GSA contracts and other GWACs typically have a one or two-year initial term with multiple options exercisable at the government client’s discretion to extend the contract for one or more years. We cannot be assured that our government clients will continue to exercise the options remaining on our current contracts, nor can we be assured that our future clients will exercise options on any contracts we may receive in the future.

If subcontractors on our prime contracts are able to secure positions as prime contractors, we may lose revenue.

For each of the past several years, as the GSA schedule contracts and GWACs have increasingly been used as contract vehicles, we have received substantial revenue from government clients relating to work performed by other information technology providers acting as subcontractors to us. In some cases, companies that have not held GSA schedule contracts or secured positions as prime contractors on GWACs have approached us in our capacity as a prime contractor, seeking to perform services as our subcontractor for a government client. Some of these providers that are currently acting as subcontractors to us may in the future secure positions as prime contractors. If one or more of our current subcontractors are awarded prime contractor status in the future, it could reduce or eliminate our revenue for the work they were performing as subcontractors to us. Revenue derived from work performed by our subcontractors represented approximately 15% and 16%, respectively of our revenue for each of fiscal 2005 and 2004.

Risks Associated with International Operations

Our international business exposes us to additional risks including exchange rate fluctuations, foreign tax and legal regulations and political or economic instability that could materially adversely affect our operating results.

In connection providing services to our clients, we are sometimes required to engage in international operations (including international operations under U.S. government contracts). Conducting international business subjects us to risks associated with operating in and selling to foreign countries, including:

•  devaluations and fluctuations in currency exchange rates;

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•  changes in or interpretations of foreign regulations that may adversely affect our ability to sell all of our products or repatriate profits to the United States;

•  imposition of limitations on conversions of foreign currencies into dollars;

•  imposition of limitations on or increase of withholding and other taxes on remittances and other payments by foreign subsidiaries or joint ventures;

•  compliance with U.S. laws and regulations that apply extraterritorially which may conflict, in whole or in part, with local laws and regulations in countries where we operate;

•  compliance with the local labor laws of the countries in which we operate;

•  hyperinflation or political instability in foreign countries;

•  potential personal injury to our personnel who may be exposed to military conflict situations in foreign countries;

•  imposition or increase of investment and other restrictions or requirements by foreign governments;

•  compliance with U.S. export control laws and regulations, which may effect our ability to provide goods and services abroad.

To the extent that our customers request us to provide services and support outside of the United States, these and other risks associated with international operations are likely to increase. Although such risks have not harmed our operating results in the past, no assurance can be given that such risks will not materially adversely affect our operating results in the future.

Risks Related to Our Business

We may lose money or generate less than anticipated profits if we do not accurately estimate the cost of our performance under fixed price or time and materials contracts.

Some of our contracts require that we perform on a fixed price basis. We derived 26.2% of our total revenue in fiscal 2005 and 22.6% of our total revenue in fiscal 2004 from fixed price contracts. A fixed price contract generally provides that we will receive a specified price for our performance under the contract, regardless of the cost to us of such performance. This requires that we accurately estimate the cost that we will incur to perform our obligations under any contract at the time that we submit our proposal to the applicable government agency. When making proposals for engagements on a fixed price basis, we rely on our estimates of costs and timing for completing the projects. These estimates are subject to numerous variables and uncertainties, and there can be no assurance that the costs of performing under any fixed price contract will not exceed, perhaps substantially, our estimates. Any increased or unexpected costs or unanticipated delays in connection with the performance of fixed price contracts, including costs and delays caused by factors outside our control, could make these contracts less profitable than anticipated or could cause us to incur losses, which could be substantial, on these contracts. In the past, we have from time to time incurred losses on some fixed price contracts and our profits on some fixed price contracts have been less than anticipated. Our operating results could be materially adversely affected if the actual costs of performing under these contracts exceed our estimates.

Many of our contracts are performed on a time and materials basis. A time and materials contract typically provides that we are paid a fixed hourly rate for direct labor costs expended and reimbursed for allowable materials, costs and expenses. We derived 43.8% of our total revenues in fiscal 2005 and 46.3% of our total revenues for fiscal 2004 from time and materials contracts. While time and materials contracts are generally subject to less uncertainty than fixed price contracts, to the extent that our actual labor costs are higher than the contract rates, we may lose money on the contract.

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Our margins and operating results may suffer if cost reimbursable contracts increase as a percentage of our total government contracts.

In general, cost reimbursable contracts are the least profitable of our government contracts. Our cost reimbursable contracts generally provide for reimbursement of costs, which are determined to be reasonable, allowable and allocable to the contract, as well as payment of a fee representing the profit margin negotiated between us and the contracting agency, which may be fixed or performance based. Our time and materials contracts generally are more profitable than our cost reimbursable contracts. Cost reimbursable contracts contributed 30.0% and 31.1% of our total revenues in fiscal 2005 and fiscal 2004, respectively. To the extent that cost reimbursable contracts represent an increased proportion of our total government contracts, our operating results could be materially adversely affected.

Our markets are highly competitive, and many of the companies we compete against have substantially greater resources.

We operate in highly competitive markets that include a large number of participants and involve intense competition to win contracts. Many of our competitors may compete more effectively than we can because they are larger, have greater financial and other resources, have better or more extensive relationships with government officials involved in the procurement process and have greater brand or name recognition. In order to stay competitive in our industry, we must attract and retain the highly skilled employees necessary to provide our services and keep pace with changing technologies and client preferences. In addition, some of our competitors have established alliances or strategic relationships among themselves or with third parties in order to increase their ability to address client needs. As a result, new competitors or alliances among competitors may emerge and compete more effectively than we can. There is also a significant industry trend towards consolidation which may result in the emergence of larger companies that may be better able to compete with us. If we are unable to compete effectively, our business could be materially adversely affected.

Our failure to attract and retain qualified employees, including our executive and senior management team, may adversely affect our business.

Our continued success depends to a substantial degree on our ability to recruit and retain the technically skilled personnel we need to serve our clients effectively. Our business involves the development of tailored technology solutions for our clients, a process that relies heavily upon the expertise and services of our employees. Competition for skilled personnel in the information technology services industry is intense, and technology service companies often experience high attrition among their skilled employees. Recruiting and training these employees require substantial resources. Our failure to attract and retain technical personnel could increase our costs of performing our contracts, reduce our ability to meet our clients’ needs, limit our ability to win new business and constrain our ability to grow.

Certain types of services are subject to the Service Contract Act and the Davis-Bacon Act. These Acts require that the contractor pay to all personnel assigned to the contract at least the prevailing wage and fringe benefits, as established by and in accordance with the regulations promulgated by the Department of Labor. We have an established policy pursuant to which we evaluate RFP’s that include Service Contract Act and Davis-Bacon Act requirements and, in the event of an award to us, ensure our compliance with these requirements.

We may be affected by intellectual property infringement claims.

Our business operations may rely on intellectual property. Our employees develop some of the software solutions and other forms of intellectual property that we use to provide IT solutions to our customers, but we also may license technology from other entities. Typically, under Federal Government contracts, our customers may claim rights in the intellectual property we develop, making it impossible for

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us to prevent their future use of our intellectual property. We are and may in the future be subject to claims from our employees or third parties who assert that software solutions and other forms of intellectual property that we used in delivering services and solutions to our customers infringe upon intellectual property rights of such employees or third parties. If our vendors, employees or third parties assert claims that we or our customers are infringing on their intellectual property, we could incur substantial costs to defend these claims. In addition, if any of these infringement claims are ultimately successful, we could be required to:

•  cease selling or using products or services that incorporate the challenged software or technology;

•  obtain a license or additional licenses; or

•  redesign our products and services that rely on the challenged software or technology.

A substantial majority of our historical growth has been due to acquisitions and we may have difficulty identifying and executing future acquisitions on favorable terms, which may adversely affect our results of operations and stock price.

A substantial majority of our historical growth was the result of acquisitions, and the selective pursuit of acquisitions remains one of our key growth strategies. We cannot assure you that we will be able to identify and execute suitable acquisitions in the future on terms that are favorable to us, or at all.

We may encounter other risks in executing our acquisition strategy, including:

•  increased competition for acquisitions which may increase the price of our acquisitions; and

•  our failure to discover material liabilities during the due diligence process, including the failure of prior owners of any acquired businesses or their employees to comply with applicable laws or regulations such as the Federal Acquisition Regulation and health, safety, employment and environmental laws and regulations, or their failure to fulfill their contractual obligations to the Federal Government or other clients.

In connection with any future acquisitions, we may decide to consolidate the operations of any acquired business with our existing operations or to make other changes with respect to the acquired business, which could result in special charges or other expenses. Our results of operations also may be adversely affected by expenses we incur in making acquisitions and, in the event that any goodwill resulting from present or future acquisitions is found to be impaired, by goodwill impairment charges. As of December 31, 2005, assuming that the Zen acquisition had occurred on such date, we had approximately $225.3 million of goodwill resulting from acquisitions on our balance sheet and, to the extent we make future acquisitions, the amount of goodwill could increase, perhaps substantially. Any of the businesses we acquire may also have liabilities or adverse operating issues.

In addition, our ability to make future acquisitions may require us to obtain additional financing and we may be materially adversely affected if we cannot obtain additional financing for any future acquisitions. To the extent that we seek to acquire other businesses in exchange for our common stock, fluctuations in our stock price could have a material adverse effect on our ability to complete acquisitions and the issuance of common stock to acquire other businesses could be dilutive to our stockholders. To the extent that we use borrowings to acquire other businesses, our debt service obligations could increase substantially and relevant debt instruments may, among other things, impose additional restrictions on our operations, require us to comply with additional financial covenants or require us to pledge additional assets to secure our borrowings.

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We may have difficulty integrating the operations of any companies we acquire, which may adversely affect our results of operations.

The success of our acquisition strategy will depend upon our ability to successfully integrate any businesses we may acquire in the future. The integration of these businesses into our operations may result in unforeseen events or operating difficulties, absorb significant management attention and require significant financial resources that would otherwise be available for the ongoing development of our business. These integration difficulties could include the integration of personnel with disparate business backgrounds, the transition to new information systems, coordination of geographically dispersed organizations, loss of key employees of acquired companies and reconciliation of different corporate cultures. For these or other reasons, we may be unable to retain key clients or to retain or renew contracts of acquired companies. Moreover, any acquired business may fail to generate the revenue or net income we expected or produce the efficiencies or cost-savings that we anticipated. Any of these outcomes could materially adversely affect our operating results.

If we are unable to manage our growth, our business may be adversely affected.

Sustaining our growth has placed significant demands on our management, as well as on our administrative, operational and financial resources. If we continue to grow, we must improve our operational, financial and management information systems and expand, motivate and manage our workforce. If we are unable to do so, or if new systems that we implement to assist in managing any future growth do not produce the expected benefits, our business, prospects, financial condition or operating results could be materially adversely affected.

Systems failures may disrupt our business and have an adverse effect on our results of operations.

Any systems failures, including failure of network, software or hardware systems, whether caused by us, a third-party service provider, unauthorized intruders and hackers, computer viruses, natural disasters, power shortages or terrorist attacks, could cause loss of data and interruptions or delays in our business or that of our clients. In addition, the failure or disruption of mail, communications or utilities could cause us to interrupt or suspend our operations or otherwise harm our business. Our property and business interruption insurance may be inadequate to compensate us for losses that may occur as a result of any system or operational failure or disruption, and insurance to cover these types of risks may not be available in the future on terms that we consider acceptable, if at all.

The systems and networks that we maintain for our clients, although redundant in their design, could also fail. If a system or network we maintain were to fail or experience service interruptions, we might experience loss of revenue or face claims for damages or contract termination. Our liability insurance may be inadequate to compensate us for damages that we might incur and liability insurance to cover these types of risks may not be available in the future on terms that we consider acceptable, or at all.

If our subcontractors fail to perform their contractual obligations, our performance as a prime contractor and our ability to obtain future business could be materially and adversely impacted.

Approximately 15% and 16%, respectively, of our total revenue in each of fiscal 2005 and fiscal 2004 was generated by work performed by subcontractors who perform a portion of the work we are obligated to deliver to our clients. A failure by one or more of our subcontractors to satisfactorily deliver on a timely basis the agreed-upon supplies and/or perform the agreed-upon services may materially and adversely affect our ability to perform our obligations as a prime contractor. In extreme cases, a subcontractor’s performance deficiency could result in the Federal Government terminating our contract for default. A default termination could expose us to liability for excess costs of reprocurement by the government and have a material adverse effect on our ability to compete for future contracts and task orders.

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Our indebtedness and debt service obligations may increase substantially and we will be subject to restriction under debt instruments.

As of December 31, 2005, we had approximately $99.3 million of debt outstanding under our Credit Agreement which had a  borrowing capacity of $160 million, comprised of a $60 million five-year revolving credit facility and a $100 million six-year term loan facility. We further amended this Credit Agreement, pursuant to the First Amendment entered into contemporaneously with the closing of our acquisition of Zen on February 27, 2006, which increased the available term loan amount to approximately $129.3 million. We had approximately $129.3 million of debt outstanding under our Amended Credit Agreement on February 27, 2006 following the closing of our acquisition of Zen.

Our leverage may increase as a result of any future acquisitions and, accordingly, the amount of our indebtedness will likely increase, perhaps substantially.

Our indebtedness could have significant negative consequences, including:

•  increasing our vulnerability to general adverse economic and industry conditions;

•  limiting our ability to obtain additional financing;

•  requiring that a substantial portion of our cash flow from operations be applied to pay our debt service obligations, thus reducing cash available for other purposes;

•  limiting our flexibility in planning for or reacting to changes in our business or in the industry in which we compete; and

•  placing us at a possible disadvantage compared to our competitors with less leverage or better access to capital.

Our Amended Credit Agreement bears interest at variable rates based upon prevailing market interest rates, which exposes us to the risk of increased interest rates. Also, our Amended Credit Agreement requires that we comply with various financial covenants and impose restrictions on us, including restrictions on, among other things, our ability to incur additional indebtedness or liens, make acquisitions and pay dividends on our capital stock.

Our ability to make scheduled payments of the principal of, to pay interest on, or to refinance, our debt will depend primarily on our future performance, which to a certain extent is subject to the economic, financial, competitive and other factors beyond our control. There can be no assurance that our business will continue to generate sufficient cash flow from operations in the future to service our debt or meet our other cash needs. If we are unable to generate this cash flow from our business, we may be required to refinance all or a portion of our existing debt, sell assets or obtain additional financing to meet our debt obligations and other cash needs. We cannot assure you that any such refinancing, sale of assets or additional financing would be possible on terms that we would find acceptable.

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If we fail to comply with the financial covenants in our Amended Credit Agreement, our lenders may exercise remedies, including requiring immediate repayment of all outstanding amounts. These financial covenants are calculated according to the definition of terms contained in the Amended Credit Agreement, which may differ from calculations using generally accepted accounting principles, or GAAP. The financial covenants in our credit facility following the acquisition of Zen include the following:

•  the First Amendment to Credit Agreement amended the leverage ratio that requires us to maintain a ratio of funded debt to consolidated EBITDA for such period as follows:

•  a fixed charge coverage ratio that requires us to maintain a ratio, on a consolidated basis for the twelve month period ending on the last day of any fiscal quarter, of (i) consolidated EBITDA less consolidated capital expenditures for such period, to (ii) the sum of consolidated interest expense plus scheduled funded debt payments plus cash taxes for such period, of greater than or equal to 1.25 to 1.00; and

•  the amount of consolidated capital expenditures made in cash during any fiscal year is limited to 2.00% of consolidated gross revenues plus the unused portion on consolidated capital expenditures that would have been permitted in the previous fiscal year in an amount not to exceed $1,000,000.

The borrowings and other amounts due under our Amended Credit Agreement are secured by substantially all of our current and future tangible and intangible assets, including accounts receivable, inventory and capital stock of our existing or future subsidiaries. Our ability to obtain other debt financing may therefore be adversely affected because the lenders under our Amended Credit Agreement will have a prior lien on our assets to secure amounts we owe to them. In addition, upon the occurrence of specified events of default under the Amended Credit Agreement, the lenders would be entitled to demand immediate repayment of all borrowings and other amounts outstanding under the Amended Credit Agreement and to realize upon the collateral pledged under the Amended Credit Agreement to satisfy our obligations to them.

The Amended Credit Agreement also requires us to comply with certain covenants, including, among others, provisions:

•  relating to the maintenance of our assets securing the debt;

•  restricting our ability to pledge assets or create other liens;

•  restricting our ability to incur additional debt beyond certain levels and in certain circumstances;

•  restricting our ability to make certain distributions, investments and restricted payments, including dividend payments on our equity securities;

•  restricting our ability to alter the conduct of our business or corporate existence;

•  restricting our ability to amend, modify, cancel, terminate or fail to renew material contracts;

•  restricting our ability to enter into transactions with affiliates;

•  restricting our ability to consolidate, merge, or sell our assets;

•  restricting our ability to purchase property or assets other than in the ordinary course of business; and

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•  restricting our ability to amend, modify or change our organizational documents, including our charter and bylaws.

Risks Related to Our Common Stock

Provisions of our charter and bylaws and Delaware law make a takeover of our company more difficult.

Our basic corporate documents and Delaware law contain provisions that might enable our management to resist an attempt to take over our company. For example, our Board of Directors can issue shares of common stock and preferred stock without stockholder approval, and the board could issue stock to dilute and adversely affect various rights of a potential acquiror. Other provisions of our charter and bylaws that could deter or prevent a third party from acquiring us include:

•  the division of our Board of Directors into three separate classes serving staggered three-year terms;

•  the absence of cumulative voting in the election of our directors, which means that the holders of a majority of the voting power of our outstanding capital stock have the power to elect all of our directors;

•  limitations on the ability of our stockholders to remove directors and the provisions requiring that vacancies in our board of directors must be filled by the remaining directors;

•  prohibitions on our stockholders from acting by written consent or calling special meetings; and

•  procedures for advance notification of stockholder nominations.

We are subject to Section 203 of the Delaware General Corporation Law that, subject to exceptions, would prohibit us from engaging in any business combination with any interested stockholder, as defined in that section, for a period of three years following the date on which that stockholder became an interested stockholder.

The board could use these and other provisions to discourage, delay or prevent a change in the control of our company or a change in our management. These provisions might also discourage, delay or prevent an acquisition of our company at a price that you may find attractive. These provisions could also make it more difficult for you and our other stockholders to elect directors and take other corporate actions and could limit the price that investors might be willing to pay for shares of our common stock.

Future sales of shares of our common stock and the resulting dilution that would occur with such sales could cause the market price of our common stock to decline.

Sales of a substantial number of shares of common stock in the public market in the course of any offering made pursuant to a registration statement, including any subsequent registration statement, or the perception that such sales could occur, could materially adversely affect the market price of our common stock and make it more difficult for us to sell equity securities in the future at a time and price we deem appropriate. As of March 1, 2006, we had 11,426,232 shares of common stock outstanding.

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Item 2. Properties

As of December 31, 2005, we leased 27 offices and 3 warehouse at various U.S. locations for an aggregate of 544,970 square feet in 15 states and the District of Columbia, of which we sublease 47,861 square feet to third parties.

Our corporate offices are located at 12012 Sunset Hills Road, Reston, Virginia in approximately 68,000 square feet of leased space.

Our other major offices are located in Colorado Springs, Colorado, Harrisonburg, Virginia, and in the Washington DC metropolitan area.

•  Our Colorado Springs properties consist of approximately 35,000 square feet under a lease that expires in April 2006 and approximately 68,000 square feet under a lease that expires in November 2006. Both of these leased facilities are being replaced by a new 2-building office campus totaling 123,200 square feet. The lease of these campus buildings will begin in May 2006.

•  In Harrisonburg, Virginia we occupy an office (15,507 sq ft under a lease that expires in November 2013) and a contract-committed warehouse (120,000 sq ft under a lease that expires August 2007).

•  In Fairfax, Virginia we have an office consisting of approximately 37,000 square feet under a lease that expires in December 2009.

•  In Arlington, Virginia, our office consists of approximately 14,100 square feet under a lease that expires in December 2012.

•  In Rockville, Maryland, we have an office consisting of approximately 24,000 square feet under a lease expiring in November 2011.

•  Our Columbia, Maryland office occupies 21,223 square feet under a lease expiring in 2012.

•  In Bethesda, Maryland, as a result of acquiring Zen, we have office space of approximately 10,738 square feet under a lease that expires November 30, 2008.

•  In addition, we have employees who work on engagements at other smaller operating locations around the United States.

All of our offices are in new, or reasonably modern, well-maintained buildings. The facilities are substantially utilized and are adequate for present operations. We do not own any real estate.

Item 3. Legal Proceedings

From time to time, we are involved in litigation, claims and disputes that arise in the ordinary course of its business. In addition, we are subject to audit, review, and investigation by various agencies of the Federal Government to determine compliance with applicable federal statutes and regulations. As a Federal Government contractor, we are subject to audit by certain federal agencies to determine if our performance and administration of our government contracts are compliant with contractual requirements and applicable federal statutes and regulations. While we cannot predict the ultimate outcome of legal proceedings, government audits, investigations, claims and disputes to which we are or may be subject, we currently believe, based upon information available to us as of the date of this filing, that any ultimate liability arising out of these matters will not have a material adverse effect on our financial position, results of operations, or cash flows.

The SEI acquisition agreement provides for a purchase price adjustment based upon the working capital of SEI as of the closing date. Subsequent to the closing date, we received a payment of $1.6 million in connection with services performed prior to the closing date that SEI had not previously billed, and was

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not authorized to bill, its customer as of the closing date. The SEI selling stockholders have asserted that they are entitled to a credit in connection with the calculation of working capital adjustment in an amount equal to the amount received by us for this post-closing payment. We believe that, in accordance with GAAP, the SEI selling stockholders should not receive the benefit of the post-closing payment. In accordance with the terms of the SEI acquisition agreement, the parties have jointly submitted the issue to an independent accounting firm for resolution. We anticipate that this matter will be resolved before the end of 2006.

Item 4. Submission of Matters To a Vote of Security Holders:   The Company had no matters submitted to stockholders for their consideration during the fourth quarter ended December 31, 2005.

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PART II

Item 5. Market for the Company’s Common Equity and Related Stockholder Matters and Issuer Purchases of Equity Securities:   Since November 12, 2002, SI International’s common stock has been publicly traded on the Nasdaq National Market under the symbol “SINT.” Prior to November 12, 2002, SI International’s common stock was not publicly traded. The high and low sales prices of SI International’s common stock for the time period indicated below, as reported by the Nasdaq National Market, were:

As of March 1, 2006, there were approximately 118 holders of record of our common stock. As of March 1, 2006, the closing price of our common stock was $32.61.

We have never declared or paid any cash dividends on our common stock. We currently intend to retain earnings, if any, to support our growth strategy and do not anticipate paying cash dividends in the foreseeable future.

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Item 6. Selected Financial Data:   The selected financial data presented below for our 2005, 2004, and 2003 fiscal years are derived from our audited consolidated financial statements included in this Form 10-K. The selected financial data presented below for our 2002 and 2001 fiscal years are derived from our audited consolidated financial statements not included in this Form 10-K. You should read the selected financial data presented below in conjunction with the consolidated financial statements, the notes to the consolidated financial statements and with “Management’s Discussion and Analysis of Financial Condition and Results of Operations” included elsewhere in this Form 10-K. Our fiscal year is based on the calendar year and ends each year on the Saturday closest to December 31 of that year. All fiscal years shown below, excluding 2005, include 52 weeks. Fiscal 2005 includes 53 weeks.

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(1)    EBITDA is defined as GAAP net income (loss) plus other expense (income), interest expense, income taxes, depreciation and amortization, change in the value of put warrants and minority interest.

(2)    EBITDA as calculated by us may be calculated differently than EBITDA for other companies. We have provided EBITDA because we believe it is a commonly used measure of financial performance in comparable companies and is provided to help investors evaluate companies on a consistent basis, as well as to enhance an understanding of our operating results. EBITDA should not be construed as either:

•  an alternative to net income (loss), as an indicator of our operating performance; or

•  as an alternative to cash flows as a measure of liquidity.

Reconciliation of Net Income to EBITDA is as follows:

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Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations:   The following discussion and analysis should be read in conjunction with the Item 6. “Selected Consolidated Financial Data,”  the consolidated financial statements and related notes included elsewhere in this Form 10-K, and the forward-looking disclaimer language in italics before Item 1. “Business”.

Our fiscal year is based on a calendar year and ends each year on the Saturday closest to December 31 of that year. As a result, our fiscal year may be comprised of 52 or 53 weeks. Our 2005 fiscal year had 53 weeks. Our 2004 and 2003 fiscal years each had 52 weeks.

Overview

We are, first and foremost, a provider of information technology and network solutions (IT) to the Federal Government. Our clients include the U.S. Air Force, U.S. Army, U.S. Navy, Department of State, Department of Homeland Security, Department of Energy, Department of Agriculture, National Institutes of Health, Federal Retirement Thrift Investment Board, National Guard Bureau, and the Intelligence community. We combine our technology and industry expertise to provide a full spectrum of state-of-the-practice solutions and services, from design and development to implementation and operations, which assist our clients in achieving mission success. We believe that our company is distinguishable from our peers within the federal IT sector in several important respects.

We employ a “Rapid Response • Rapid Deployment™” methodology that enables the rapid standing up of innovative solutions and the incorporation of additional capabilities in rapid succession. This capability allows us to respond to urgent IT imperatives quickly, often in a matter of months, and within a well defined budget. We can, therefore, provide solutions for current IT needs, while establishing a platform for advancing long-term transformational objectives. We possess a proven ability to respond to high priority information technology and network needs through innovation, and an enviable reputation for timely delivery of robust solutions on assignments where failure is not an option. Our Mission Critical, Mission Accomplished solutions enable clients to respond to new mandates, expand the scope of their missions, and reengineer underlying business processes. We have a demonstrated ability of turning troubled IT projects into winning outcomes and realized exceptional growth from high-quality client engagements. We also utilize mature and proven processes to manage and market large-scale ID/IQ contracts, such as C4I2TSR. We employ a diverse, innovative team that effectively utilizes small business partners’ unique skills and expertise for mission critical IT projects.

Fiscal 2005 Review and Fiscal 2006 Outlook

During the past year, we experienced continued growth in our four key focus areas: Defense Transformation, Homeland Defense, Federal IT Modernization, and Mission-Critical Outsourcing. In terms of customer concentration, the DoD continues to grow faster organically than our other customers, which is the result of ongoing defense transformation initiatives that require our specialty in rapidly performing mission-critical work. Virtually all of our engagements with the DoD either directly support, or are closely related to DoD Transformation goals. We will continue aligning our programs and capabilities along our focus areas of Homeland Defense, Federal IT Modernization, Mission-Critical Outsourcing, and Defense Transformation, given these sectors most accurately reflect our customer’s highest priorities. The Federal Government’s increased use of technology as a weapon in the war on terrorism and to enhance operational efficiency among federal agencies drove our growth in 2005. We expect that government initiatives involving information sharing, “net-centric” warfare, and business process transformation will be among our customer base’s key focus areas in 2006.

With the SEI acquisition, our support to civilian agencies increased as a percentage of total revenue. SEI’s largest client was the Department of Homeland Security. The national priority on securing our borders, along with urgent need for information sharing and other critical Department of Homeland

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Security issues, will continue driving the demand for budget increases in homeland defense. With the Bridge acquisition, we expanded our presence in the Intelligence community. We believe that this ongoing need for improved intelligence collection will not diminish. For the foreseeable future, we anticipate that DoD’s, Department of Homeland Security’s, and the Intelligence community’s IT and network requirements will be the largest drivers of our organic growth. Also, strategic acquisitions that add value will continue to impact our future customer mix. Finally, the recent Zen acquisition provides us with greater access to new customers and additional cross-selling opportunities for our portfolio of mission-critical solutions.

The addition of SEI and Bridge allowed us to continue supporting our existing customer base, while strengthening our position with the Deparment of Homeland Security and the Intelligence community. After consummating the SEI and Bridge acquisitions, we realigned our practice areas in 2005 to reflect the additional areas of expertise that we obtained from these two companies. Our eight practice areas now consist of program management & acquisition support, integrated solutions development, information security, records management, learning solutions, systems engineering, network solutions, and mission-critical outsourcing.

In 2005, Congress delayed approving the government fiscal 2006 appropriations bills. For us, this impact was largely confined to new project starts previously forecasted for our fourth quarter fiscal 2005. Even in years where Congress passed appropriations bills in a timely fashion, it is not uncommon for several months to pass before funding was actually issued. With the combination of the GSA’s reorganization and recent contract award delays, we expect that government agencies will continue moving away from using GSA contract vehicles and start utilizing government-wide and agency-specific contract vehicles more frequently in 2006 until the GSA reorganization is complete.

In fiscal 2005 and fiscal 2004, we received 98.1% and 96.6%, respectively, of our revenues from services we provided to various departments and agencies of the Federal Government, both directly and through other prime contractors, and 1.9% and 3.4%, respectively, of our total revenues from work performed for commercial entities. The following table shows our revenues from the client groups listed as a percentage of total revenue. Revenue data for the DoD includes revenue generated from work performed under engagements for both the DoD and the Intelligence community.

As a result of the Zen acquisition, we believe that the percentage of our revenue attributable to the DoD and federal civilian agencies should increase, and the percentage of our revenue attributable to commercial entities, including international operations, should decrease marginally.

We have derived a substantial majority of our revenues from governmental contracts under which we act as a prime contractor. We also provide services indirectly as a subcontractor. The following table shows our revenues as prime contractor and as subcontractor as a percentage of our total revenue for the following periods:

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As a result of the Zen acquisition, we believe the percentage of our prime contract revenue may increase marginally.

Our services are provided under three types of contracts: cost reimbursable, time and materials and fixed price contracts. The following table shows our revenues from each of these types of contracts as a percentage of our total revenue for the following periods:

As a result of the acquisition of Zen, we anticipate that during fiscal year 2006 that the percentage of our revenue attributable to time and materials and fixed price contracts may increase marginally.

Under cost reimbursable contracts, we are reimbursed for costs that are determined to be reasonable, allowable and allocable to the contract, and paid a fee representing the profit margin negotiated between us and the contracting agency, which may be fixed or performance based. Under cost reimbursable contracts we recognize revenues and an estimate of applicable fees earned as costs are incurred. We consider fixed fees under cost reimbursable contracts to be earned in proportion to the allowable costs incurred in performance of the contract. For performance-based fees under cost reimbursable contracts, we recognize the relevant portion of the expected fee to be awarded by the client at the time such fee can be reasonably estimated, based on factors such as our prior award experience and communications with the client regarding performance. In general, cost reimbursable contracts are the least profitable of our government contracts.

Under time and materials contracts, we are reimbursed for labor at fixed hourly rates and generally reimbursed separately for allowable materials, costs and expenses. To the extent that our actual labor costs under a time and materials contract are higher or lower than the billing rates under the contract, our profit under the contract may either be greater or less than we anticipated or we may suffer a loss under the contract. We recognize revenues under time and materials contracts by multiplying the number of direct labor hours expended by the contract billing rates and adding the effect of other billable direct costs. In general, we realize a higher profit margin on work performed under time and materials contracts than cost reimbursable contracts.

Under fixed price contracts, we perform specific tasks for a fixed price. Compared to cost reimbursable and time and materials contracts, fixed price contracts generally offer higher profit margin opportunities but involve greater financial risk because we bear the impact of cost overruns in return for the full benefit of any cost savings. We generally do not undertake complex, high-risk work, such as long-term software development, under fixed price terms. Fixed price contracts may include either a product delivery or specific service performance over a defined period. Revenue on fixed price contracts that provide for the Company to render services throughout a period is recognized as earned according to contract terms as the service is provided on a proportionate performance basis. While a substantial number of these contracts are generally less than six months in duration, we have several multi-year contracts of this type in which the customer has the option to extend the contractual term beyond the current term.

If we anticipate a loss on a contract, we provide for the full amount of anticipated loss at the time of that determination.

Our most significant expense is direct cost, which consists primarily of direct labor costs for program personnel and direct expenses incurred to complete contracts, including cost of materials and subcontract

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efforts. Our ability to predict accurately the number and types of personnel, their salaries, and other costs, can have a significant impact on our direct cost.

The allowability of certain direct and indirect costs in federal contracts is subject to audit by the client, usually through the DCAA. Certain indirect costs are charged to contracts and paid by the client using provisional, or estimated, indirect rates, which are subject to later revision, based on the government audits of those costs.

Approximately 19.5% of our revenue recognized during fiscal 2005 was derived from contracts that, as of February 28, 2006, are, or are expected to become, subject to competitive bids prior to the end of government fiscal 2006. We actively monitor our relationships with our clients during our engagements, as well as the quality of the service we provide, to assist in our efforts to win recompetition bids. In addition, we strive to maintain good relationships with a wide variety of government contractors.

Recent Events

Zen Acqusition.   On February 27, 2006, we closed the acquisition of Zen. Zen is a provider of critical IT services, specializing in managed network services, information assurance, software development and systems engineering, database and systems administration and IT consulting to various U.S. Government agencies.  Zen’s largest clients include the Missile Defense Agency (MDA), Department of Defense’s Washington Headquarters Services (WHS), Federal Communications Commission (FCC), the Pension Benefit Guaranty Corporation (PBGC), and the Federal Trade Commission (FTC).  As a result of our acquisition of Zen, we gained approximately 275 employees, of which approximately 50% hold security clearances.  The acquisition of Zen provides additional scale with existing customers as well as diversification with new government customers.

Pursuant to the terms of the Zen Agreement we acquired all of the outstanding capital stock of Zen for $60 million in cash, of which we are withholding $6 million for 15 months in order to secure post-closing indemnity obligations of the sellers.  The purchase price is subject to a two-way adjustment based upon whether the working capital of Zen as of the closing date was above or below the target working capital specified in the Zen Agreement.  Each of the parties to the Zen Agreement has made customary representations and warranties and agreed to certain indemnification obligations.   The transaction was funded through cash-on-hand, a subordinated Seller’s Note in the amount of $6 million, and borrowing from our newly amended credit facility, which is described below. We expect the acquisition to be accretive to earnings.  Zen’s trailing twelve months revenue ended November 30, 2005, was approximately $38 million (unaudited).

Amendment to Credit Facility.   On February 27, 2006, we entered into the First Amendment. The First Amendment provides new terms and conditions with respect to the term loan portion of the Credit Agreement and increased the available term loan amount to approximately $129.3 million from approximately $99.3 million. The funds borrowed under the new term loan were used to (a) refinance the initial term loan; (b) to finance the acquisitýion of Zen; and (c) to provide for working capital, capital expenditures and other general corporate purposes. The First Amendment amended the leverage ratio that requires us to maintain a ratio of funded debt to consolidated EBITDA for such period as follows:

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These ratios will be calculated in accordance with the definitions and terms contained in the Amended Credit Agreement, which may be different than calculations pursuant to GAAP.

NVC Contract Award.  On January 31, 2006, in a recompetition for our expiring National Visa Center, or NVC, contract, we were awarded the successor contract for the NVC contract by the Department of State. Under the contract, we anticipate performing over 20 million immigrant visa transactions each year at the NVC in Portsmouth, New Hampshire and at the Kentucky Consular Center in Williamsburg, Kentucky. The prime contract has a one-year base period and four one-year options with a potential value of approximately $84 million, inclusive of the options. The prior NVC contract generated 9.1% of our total revenues in fiscal 2005 and 9.2% of our total revenues in fiscal 2004.

Acceleration of Vesting of Stock Options.  On December 13, 2005, our Board of Directors approved the accelerated vesting of unvested stock options previously awarded to employees, officers and directors as of December 7, 2005 in light of new accounting regulations that were to come into effect January 1, 2006. Based on the Statement of Financial Accounting Standards No. 123R, “Share-Based Payment” (SFAS 123R), the Board took the action to accelerate the unvested stock with the belief that it is in the best interest of stockholders, as it will reduce the Company’s reported compensation expense in future periods.

Liquidity and Capital Resources

General.  Short-term liquidity requirements are created by our use of funds for working capital, capital expenditures, and the need to provide debt service. We expect to meet these requirements through a combination of cash flow from operations and borrowings under our Amended Credit Agreement.

We anticipate that our long-term liquidity requirements, including any further acquisitions, will be funded through a combination of cash flow from operations, borrowings under our Amended Credit Agreement, additional secured or unsecured debt or the issuance of common or preferred stock, each of which may be initially funded through borrowings under our Amended Credit Agreement.

Cash and Cash Equivalents.  We consider cash on deposit and all highly liquid investments with original maturities of three months or less to be cash and cash equivalents. Cash and cash equivalents, including marketable securities, as of the end of fiscal 2005, fiscal 2004, and fiscal 2003 were $34.0 million, $5.8 million, and $23.3 million, respectively.

Cash Flow.  The following table sets forth our sources and uses of cash for the years ended December 31, 2005, 2004 and 2003.

Our operating cash flow is primarily affected by the overall profitability of our contracts, our ability to invoice and collect from our clients in a timely manner, and our ability to manage our vendor payments. We bill most of our clients monthly after services are rendered. Cash provided by operations in fiscal 2005 was attributable to net income of $16.9 million, plus depreciation, amortization and other non-cash items of $9.9 million. Cash used in operations in fiscal 2004 was attributable to an increase in working capital of $18.6 million, partially offset by net income of $10.9 million plus depreciation, amortization and other non-cash items of $6.0 million. Cash provided by operations in fiscal 2003 was attributable to net income of $7.4 million plus depreciation, amortization and other non-cash items of $2.6 million and a decrease in working capital of $6.1 million.

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Our cash flow used in investing activities consists primarily of capital expenditures, the purchase and sale of marketable securities, and acquisitions. In fiscal 2005, we paid $74.0 million for SEI, purchased $42.1 million of marketable securities, and purchased capital assets totalling $2.7 million. We partially offset the cash use with $36.2 million of proceeds from the sale of marketable securities. In fiscal 2004, we paid $64.9 million and $29.5 million, respectively, for Matcom and Bridge acquisitions, purchased $2.1 million of marketable securities, and purchased capital assets totalling $1.2 million. We partially offset the cash use with $11.0 million of proceeds from the sale of marketable securities. In fiscal 2003 we purchased $35.6 million of marketable securities and invested $1.3 million in capital assets. We partially offset the cash use with $24.7 million of proceeds from the sale of marketable securities.

Our cash flow provided by financing activities consists primarily of borrowings under and payments on our credit facility. Cash provided by financing activities for fiscal year 2005 was attributable to proceeds of $100.0 million from the term loan portion of our credit facility, and proceeds of $3.7 million from the exercise of stock options. Cash provided by financing activities was partially offset by repayments of borrowings under the line of credit portion of our credit facility of $29.0 million, payment of debt issuance fees of $3.2 million, partial repayment of the term loan portion of our credit facility of $0.8 million, and repayments of capital leases of $0.1 million. Cash provided by financing activities for fiscal year 2004 was attributable to proceeds of $51.2 million from issuance of common stock from our underwritten public common stock offering, proceeds of $30.0 million from the term loan portion of our credit facility, proceeds of $29.0 million from borrowings on the line of credit portion of the credit facility, and proceeds of $0.9 million from the exercise of stock options. Cash provided by financing activities was partially offset by the repayment of $30.0 million for the term loan portion of our credit facility, payment of debt issuance fees of $1.2 million, and repayments of capital lease obligations of $0.1 million. Cash used in financing activities for fiscal year 2003 was attributable to repayments of bank overdrafts of $2.2 million, $0.1 million partial repayment of an outstanding note from the acquisition of Systems Technology Associates, and payments for our capital leases of $0.1million, partially offset by proceeds from the exercise of stock options of $0.1 million.

Results of Operations

The following table sets forth certain items from our consolidated statements of operations as a percentage of revenues for the periods indicated.

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Fiscal year 2005 compared with fiscal year 2004

Revenue.  Substantially all of our revenue is derived from services and solutions provided to the Federal Government, primarily by our employees and, to a lesser extent, our subcontractors. Revenues from work under Federal Government contracts increased 54.0% to $390.3 million from $253.4 million for the same period in 2004. This increase was attributable to federal business acquired, new contract awards, successful recompetition wins on existing programs and growth within existing programs in our three focus areas: Federal IT Modernization/ Mission-Critical Outsourcing, Defense Transformation, and Homeland Defense. Commercial and other revenues decreased 14.5% to $7.6 million in 2005 from $8.9 million in 2004. This decrease was attributable to our continued focus on opportunities for the Federal Government. We expect revenue growth to continue primarily from Federal Government civilian and defense organizations.

Direct costs.  Direct costs include direct labor and other direct costs, such as materials and subcontracts, incurred to provide our services and solutions to our customers. Generally, changes in direct costs are correlated to changes in revenue as resources are consumed in the production of that revenue. The increase in direct costs from fiscal 2004 to fiscal 2005 was attributable primarily to the increase in revenue. As a percentage of revenue, direct costs were 61.9% for fiscal 2005 as compared to 63.6% for fiscal 2004. Direct costs will continue to increase in conjunction to revenue growth.

Indirect costs.  Indirect costs include facilities, selling, bid and proposal, indirect labor, fringe benefits and other discretionary costs. The increase in indirect costs from fiscal 2004 to fiscal 2005 was primarily attributable to the expected growth of support functions necessary to facilitate and administer the growth in direct costs. In fiscal 2005, indirect costs were 28.4% of revenue compared to 27.4% of revenue in fiscal 2004. However, we believe in future years, indirect costs will continue to grow, but should decrease as a percentage of sales.

Depreciation and Amortization.  Depreciation and amortization includes the depreciation of computers, furniture and other equipment, the amortization of third party software we use internally, leasehold improvements and intangible assets. As a percentage of revenue, depreciation was 0.5% for fiscal 2005 as compared to 0.9% for the same period in fiscal 2004.

Amortization of Intangible Assets.  Amortization of intangible assets includes the amortization of intangible assets acquired in connection with the acquisitions in accordance with SFAS 142, Goodwill and Other Intangible Assets. We discontinued the amortization of goodwill effective December 30, 2001. Identifiable intangible assets are amortized over their estimated useful lives. Non-compete agreements are generally amortized straight-line over the term of the agreement, while contracts and related client relationships are amortized proportionately against the acquired backlog. For the fiscal year ended December 31, 2005, we amortized $2.3 million of intangible assets which we capitalized in connection with the acquisitions of Bridge, SEI, and Matcom. For the fiscal year ended December 25, 2004, we amortized $0.6 million of intangible assets which we capitalized in connection with the acquisition of Matcom.

Income from operations.  This increase in income from operations from fiscal 2004 to fiscal 2005 was attributable primarily to the increase in revenue. As a percentage of revenue, income from operations was 8.6% for fiscal 2005 as compared to 7.9% in fiscal 2004. We anticipate continued improvement in our operating margin.

Interest expense.  Interest expense is primarily related to interest expense incurred or accrued under our outstanding borrowings under our credit facility and, going forward, to a lesser extent, our interest rate swap agreement. The increase in interest expense from fiscal 2004 to fiscal 2005 was attributable primarily to the borrowing of debt subsequent to the acquisitions of Bridge, SEI and Matcom. As a percentage of revenue, interest expense was 1.5% for fiscal 2005 as compared to 1.1% for the same period in fiscal 2004. We anticipate an increase in interest expense in fiscal year 2006 due to increased borrowings under our

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Amended Credit Agreement made in connection with the Zen acquisition. Interest expense included $705,000 and $1,000,000 of amortization and write-off of deferred financing costs during fiscal 2005 and fiscal 2004.

Provision for income taxes.  Our effective tax rate is typically greater than the federal statutory rate of 34% due primarily to state income tax rates and certain nondeductible expenses. Our fiscal year 2005 tax provision represents an effective tax rate of 39.5%. Our fiscal 2004 tax provision represents an effective tax rate of 39.3%.

Fiscal year 2004 compared with fiscal year 2003

Revenue.  Revenues from work under Federal Government contracts increased 60.7% to $253.4 million from $157.7 million for the same period in 2003. This increase was attributable to federal business acquired, new contract awards, successful recompetition wins on existing programs and growth within existing programs in our four focus areas: Federal IT Modernization, Defense Transformation, Homeland Defense, and Mission-Critical Outsourcing. Commercial and other revenues decreased 16.0% to $8.9 million in 2004 from $10.6 million in 2003. This decrease was attributable to our continued focus on opportunities for the Federal Government.

Direct costs.  The increase in direct costs from fiscal 2003 to fiscal 2004 was attributable primarily to the increase in revenue. As a percentage of revenue, direct costs were 63.6% for fiscal 2004 as compared to 60.6% for fiscal 2003.

Indirect costs.  The increase in indirect costs from fiscal 2003 to fiscal 2004 was primarily attributable to the expected growth of support functions necessary to facilitate and administer the growth in direct costs.

Depreciation and Amortization.  The increase in depreciation and amortization from fiscal 2003 to fiscal 2004 was attributed primarily to increased capital expenditures and the acquisition of Matcom. As a percentage of revenue, depreciation was 0.9% for fiscal 2004 as compared to 1.2% for the same period in fiscal 2003.

Amortization of Intangible Assets.  For the fiscal year ended December 25, 2004, we amortized $0.6 million of intangible assets which we capitalized in connection with the acquisition of Matcom. There was no amortization of intangible assets for the fiscal year ended December 27, 2003.

Income from operations.  The increase in income from operations from fiscal 2003 to fiscal 2004 was attributable primarily to the increase in revenue. As a percentage of revenue, income from operations was 7.9% for fiscal 2004 as compared to 7.6% in fiscal 2003.

Interest expense.  The increase in interest expense from fiscal 2003 to fiscal 2004 was attributable primarily to the borrowing of debt subsequent to the acquisition of Matcom. As a percentage of revenue, interest expense was 1.1% for fiscal 2004 as compared to 0.4% for the same period in fiscal 2003. Interest expense included $1,000,000 and $379,000 of amortization and write-off of deferred financing costs during fiscal 2004 and fiscal 2003.

Provision for income taxes.  Our fiscal year 2004 tax provision represents an effective tax rate of 39.5%. Our fiscal 2003 tax provision represents an effective tax rate of 39.3%.

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The following table sets forth certain items from our consolidated statements of operations.

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Supplemental Quarterly Information

The following table sets forth quarterly unaudited consolidated financial data for the fiscal quarters of 2005 and 2004, expressed in dollars and as a percentage of total revenues for the respective periods. We believe that this unaudited financial information includes all adjustments, consisting only of normal recurring adjustments, necessary for a fair presentation of the information for each period. All of the fiscal quarters reflected in the following table had thirteen weeks, except for the fourth quarter of fiscal 2005, which has fourteen weeks. Some unevenness of revenue from quarter to quarter exists primarily because of the timing of purchases of materials necessary to perform certain obligations under our C4I2SR contract with U.S. Air Force Space Command.