On December 24, 2008, SI International, Inc., a Delaware corporation (the "Company") and Serco Group plc, a public limited company organized under the laws of England and Wales ("Serco Group"), issued a press release announcing that in connection with the Agreement and Plan of Merger (the "Merger Agreement"), dated August 26, 2008, by and among the Company, Serco Group, Serco Inc., a New Jersey Corporation and Matador Acquisition Corporation, a Delaware corporation and wholly-owed subsidiary of Serco Inc. (the "Merger Agreement"), the Committee on Foreign Investment in the United States ("CFIUS") review has been completed. Successful completion of the CFIUS review process was one of the closing conditions set forth in the Merger Agreement. The merger continues to be subject to other customary closing conditions. The Company believes that the merger will be consummated shortly. A copy of the press release is attached hereto as Exhibit 99.1 and is incorporated by reference herein.

d) Exhibits.

Exhibit No.                                 Description
   99.1        Press release, dated December 24, 2008, issued by SI
               International, Inc. and Serco Group plc.