FORM 4
o Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

(Print or Type Responses)		   UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF
CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934,
Section 17(a) of the Public Utility Holding Company Act of 1935 or
Section 30(f) of the Investment Company Act of 1940		  
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1.   Name and Address of Reporting Person*   2.   Issuer Name and Ticker or Trading Symbol   6.   Relationship of Reporting Person(s) to Issuer
(Check all applicable)
    Antle   S.   Bradford       SI International, Inc. (SINT)              Director            10% Owner
 
           
    (Last)   (First)   (Middle)   3.   I.R.S. Identification Number of Reporting Person, if an entity (voluntary)   4.   Statement for
Month/Day/Year		         X   Officer (give
        title below)		            Other
        (specify below)
    12012 Sunset Hill Road, Suite 800               2/12/03       President and Chief Operating Officer
 
 
     
(Street)           5.   If Amendment, Date of Original (Month/Day/Year)   7.   Individual or Joint/Group Filing
(Check Applicable Line)
    X     Form filed by One Reporting Person
             Form filed by More than One
    Reston   VA   20190                                   Reporting Person
    (City)   (State)   (Zip)                            
Table I — Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.   Title of Security
(Instr. 3)		   2.   Transaction Date   2A.   Deemed Execution Date, if any   3.   Transaction Code
(Instr. 8)		   4.   Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)		   5.   Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)		   6.   Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)		   7.   Nature of Indirect Beneficial Ownership
(Instr. 4)
            (Month/Day/Year)   (Month/Day/Year)  
                       
                            Code   V       Amount   (A) or (D)   Price                        
                                                                         
                                                                         
                                                                         
                                                                         
                                                                         
                                                                         

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
 
 
 
 

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
 
 
 
 
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SEC 1474 (3-00)

Table II — Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1.   Title of Derivative Security
(Instr. 3)		   2.   Conversion or Exercise Price of Derivative Security   3.   Transaction Date
(Month/Day/Year)		   4.   Transaction Code
(Instr. 8)		   5.   Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)		   6.   Date Exercisable and Expiration Date (Month/Day/Year)
                               
                            Code   V       (A)   (D)       Date
Exercisable		   Expiration Date
    Stock Option (right to buy)       $11.19       2/12/03       J(1)           14,780           1/31/04   1/31/13
                                                         
                                                         
                                                         
                                                         
                                                         
                                                         
                                                         
                                                         
                                                         
                                                         
7.   Title and Amount of Underlying Securities
(Instr. 3 and 4)		   8.   Price of Derivative Security
(Instr. 5)		   9.   Number of Derivative Securities Beneficially Owned At End of Month
(Instr. 4)		   10.   Ownership Form of Derivative Securities: Direct (D) or Indirect (I) (Instr. 4)   11.   Nature of Indirect Beneficial Ownership
(Instr. 4)
   
                               
    Title   Amount or Number of Shares                                
    Common Stock   14,780               99,466       D        
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         

Explanation of Responses:
(1) Granted by the Compensation Committee of the Board of Directors of the issuer for no consideration.

/s/ S. Bradford Antle   2/13/02
**Signature of Reporting Person		  
Date

**
 
Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
 
 
 
 

Note:
 
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