StreetInsider.com Pre-Open Movers: SI International, Inc. (Nasdaq: SINT) 17% LOWER; revised its previously announced first quarter and full year FY08 guidance.

Based on current trends, the Company is now forecasting that revenues for first quarter FY08 will be between $128 million and $130 million.

Net Income is expected to be in the range of $3.2 million to $3.6 million, and diluted earnings per share are expected to be between $0.24 and $0.27 on a weighted average share count of 13.4...