SI International and CCG Investor Relations Win Stevie Award for Best Investor Relations Program in 4th Annual

SI International and CCG Investor Relations Win Stevie Award for Best Investor Relations Program in 4th Annual
American Business AwardsSM

LOS ANGELES – June 15, 2006 – CCG Investor Relations, a leading investor relations and strategic communications agency, today announced that the agency and its client, SI International, Inc. (NASDAQ: SINT), was awarded the Stevie award for Best Investor Relations Program from American Business Awards on June 12, 2006. The highly competitive award is bestowed annually to honor and generate public recognition of the efforts, accomplishments, and positive contributions of companies and business people worldwide.

Hailed as “the business world’s version of the Oscars” by the New York Post (April 27, 2005), The American Business Awards are the only national, all-encompassing business awards program honoring great performances in the workplace. Nicknamed Stevie for the Greek word “crowned,” the coveted award is designed by the same company that makes the Oscar, Clio, and other major awards. The ceremonies were hosted by CNN business news anchor Ali Velshi, videocast live on the Internet, and broadcast nationwide on radio last night.

“We are pleased to have our investor relations program recognized with the prestigious Stevie Award,” said Alan Hill, Vice President of Corporate Communications and Investor Relations at SI International, Inc. “This demonstrates the effectiveness of our integrated communications strategy to define and discuss the competitive benefits of our Rapid Response Rapid Deployment® approach.”

Stevie Awards were presented in over 40 categories including Best Overall Company, Best Executive, and Best Corporate Social Responsibility Program. More than 1,500 entries from companies of all sizes and in virtually every industry were submitted for consideration.

“We would like to congratulate SI International for winning this award, which reflects the strength of the company’s investor relations program and the benefits of consistent and open communication with the investment community. We are pleased to support them in promoting their investment story,” said Crocker Coulson, President of CCG Investor Relations. CCG has worked with SI International since December 2002, shortly after the company’s initial public offering, in developing its investor relations and media, branding and marketing capabilities.

About SI International:
SI International, a member of the Russell 2000 index, is a provider of information technology and network solutions (IT) primarily to the Federal government. The Company defines, designs, develops, deploys, trains, and operates mission-critical solutions. SI International delivers solutions quickly - often in a matter of months with a focus on federal IT modernization, defense transformation, homeland defense, and mission-critical outsourcing. More information about SI International can be found at www.si-intl.com.

About CCG Investor Relations:
CCG is one of the nation’s leading investor relations and strategic communications agencies. In business for over 25 years, the agency provides a complete range of investor communications and counseling services to over 40 clients on the New York, American and NASDAQ stock markets. CCG has been awarded a number of industry honors for its handling of complex investor relations and crisis communications matters. The agency’s corporate headquarters is in Los Angeles with additional offices in New York, Hong Kong, Newport Beach, California and Columbia, North Carolina. CCG is also the managing partner of an Asia-based joint venture, CCG Elite, with a staff of 16 professionals and 40 clients, providing Best Practice investor relations services to a growing number of Asian companies seeking to access the US capital markets. For further information, contact CCG directly, or visit the Company's Web site at www.ccgir.com.

About The Stevie Awards
Stevie Awards are conferred in three programs: The American Business Awards, The International Business Awards, and The Stevie Awards for Women Entrepreneurs. Honoring companies of all types and sizes and the people behind them, the Stevies recognize outstanding performances in the workplace worldwide. Learn more about The Stevie Awards at www.stevieawards.com.