SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                    FORM 8-K


                Current Report Pursuant to Section 13 or 15(d) of
                       The Securities Exchange Act of 1934


                       Date of Report: September 22, 2000



                          FactSet Research Systems Inc.
                          -----------------------------
             (Exact name of registrant as specified in its charter)


Delaware                          001-11869                           13-3362547
(State or other jurisdiction      (Commission                   (I.R.S. Employer
of incorporation)                  File No.)                 Identification No.)




One Greenwich Plaza Greenwich, Connecticut                                 06830
(Address of principal executive offices)                              (Zip Code)


Registrant's telephone number, including area code                (203) 863-1500


Item 5.         Other Events

On September 5, 2000,  the  registrant  issued the press release filed with this
Current Report on Form 8-K as Exhibit 99.1. The information contained in Exhibit
99.1 is incorporated by reference herein.


Item 7.         Financial Statements and Exhibits

Exhibit No.     Description
-----------     -----------
99.1            Press Release issued September 5, 2000 (Filed herewith)
SIGNATURES


Pursuant  to the  requirements  of the  Securities  Exchange  Act of  1934,  the
registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned hereunto duly authorized.

FACTSET RESEARCH SYSTEMS INC.
Registrant

By: /s/ Ernest S. Wong
----------------------
Senior Vice President,
Chief Financial Officer
and Secretary

Date: September 22, 2000
------------------------