FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES 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(h) of the Investment Company Act of 1940

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(Print or Type Responses)

1. Name and Address of Reporting Person *   Blair Nancy E 2. Date of Event Requiring Statement (Month/Day/Year) 09/07/2005 3. Issuer Name and Ticker or Trading Symbol FACTSET RESEARCH SYSTEMS INC [FDS] (Last) (First) (Middle) BLAIR & POTTS, P.O. BOX 1214 4. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director __X__ 10% Owner _____ Officer (give title below) _____ Other (specify below) 5. If Amendment, Date Original Filed(Month/Day/Year) (Street) STAMFORD, CT 06904-1214 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Beneficially Owned

1.Title of Security (Instr. 4) 2. Amount of Securities Beneficially Owned (Instr. 4) 3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 4. Nature of Indirect Beneficial Ownership (Instr. 5) Factset Common Stock 3,900,555 (1) I Executor of Estate Factset Common Stock 1,500,000 (2) I Executor of Estate holding beneficial interest

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.			SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Factset Common Stock Options	12/22/2005	12/22/2014	Factset Common Stock	22,500	$ 0	I	Executor of Estate

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Blair Nancy E BLAIR & POTTS P.O. BOX 1214 STAMFORD, CT 06904-1214	Â	  X	Â	Â

Signatures

/s/ Nancy E. Blair		09/29/2005
**Signature of Reporting Person		Date
/s/ Brian C. Wille		09/29/2005
**Signature of Reporting Person		Date
/s/ Nancy E. Blair, for the Estate		09/29/2005
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 5(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	On Sep. 27, 2005 the estate sold 1,800,000 shares of Factset common stock through a Rule 144 transaction.
(2)	The estate is the non-managing member of Wille Family Investments LLC, which owns 1,500,000 shares of Factset common stock. Brian C. Wille is the manager of Wille Family Investments LLC.
  Remarks: This Form 3 is also filed on behalf of the Estate of Howard E. Wille,  P.O. Box 1214, Stamford, CT  06904-1214 and the  co-executor of the estate Brian C. Wille, 1088 Park Avenue, New York, NY  10128.

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, See Instruction 6 for procedure.

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