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)

Culver

Walter

J.

SI International, Inc. (SINT)

X   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, 8th Floor

2/12/03

Vice Chairman of the Board and Director of Major Programs

(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).
		Potential persons who are to respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.		(Over) SEC 1474 (3-00)

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

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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)

4,340

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		4,340								26,040				D

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

**		Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note:		File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Potential persons who are to respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.						Page 2

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