SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549

                                 SCHEDULE 13D
                                (Rule 13d-101)

          INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO
          13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO 13d-2(a)


                         Factset Research Systems Inc.
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                               (Name of Issuer)

                    Common Stock, Par Value $.01 per Share
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                        (Title of Class of Securities)


                                   303075105
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                                (CUSIP Number)

                            J. Michael Schell, Esq.
                   Skadden, Arps, Slate, Meagher & Flom LLP
                               Four Times Square
                         New York, New York 10036-6522
                                (212) 735-3000
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                 (Name, Address and Telephone Number of Person
               Authorized to Receive Notices and Communications)


                               January 21, 2004
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            (Date of Event which Requires Filing of this Statement)


         If the filing person has previously filed a statement on Schedule 13G
to report the acquisition which is the subject of this Schedule 13D, and is
filing this schedule because of Rule 13d-1(e), 13d-1(f) or 13d-1(g), check the
following box [X]

         NOTE: Schedules filed in paper format shall include a signed original
and five copies of the schedules, including all exhibits. See Rule 13d-7 for
other parties to whom copies are to be sent.


CUSIP No. 303075105 - ------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON. Wille, Howard E. - ------------------------------------------------------------------------------- 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [ ] (b) [X] - ------------------------------------------------------------------------------- 3. SEC USE ONLY - ------------------------------------------------------------------------------- 4. SOURCE OF FUNDS PF - ------------------------------------------------------------------------------- 5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e): [ ] - ------------------------------------------------------------------------------- 6. CITIZENSHIP OR PLACE OF ORGANIZATION United States of America - ------------------------------------------------------------------------------- NUMBER OF 7. SOLE VOTING POWER 5,604,231 SHARES BENEFICIALLY -------------------------------------------------- OWNED BY EACH 8. SHARED VOTING POWER N/A REPORTING PERSON WITH: -------------------------------------------------- 9. SOLE DISPOSITIVE POWER 5,604,231 -------------------------------------------------- 10. SHARED DISPOSITIVE POWER N/A - ------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 5,604,231 - ------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES [X] As of November 25, 2003, Adelaide McManus, Mr. Wille's spouse, owned 295,752 shares of Common Stock. Mr. Wille disclaims beneficial ownership of such shares. - ------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 16.4% - ------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON IN

Item 1. Security and Issuer This Statement on Schedule 13D (the "Statement") relates to the common stock, par value $.01 per share (the "Shares"), of Factset Research Systems Inc., a Delaware corporation ("Factset" or the "Company"). The principal executive offices of the Company are located at One Greenwich Plaza, Greenwich, Connecticut 06830. Item 2. Identity and Background This Statement is being filed by Howard E. Wille. Mr. Wille's address is 291 Round Hill Road, Greenwich, Connecticut 06830. Mr. Wille is the co-founder of Factset, which was formed in 1978. Mr. Wille was the Company's chief executive officer and chairman of the board of directors from its inception in 1978 until his retirement in 2000. Mr. Wille is a current member of the board of directors of Factset. Mr. Wille has not been convicted in any criminal proceeding within the last five years, nor has he been subject to any civil proceeding regarding violations of state or federal securities laws. Mr. Wille is a citizen of the United States of America. Item 3. Source and Amount of Funds or Other Consideration Mr. Wille is the co-founder of Factset. He acquired his shares primarily in connection with his initial formation of the Company. Mr. Wille acquired a small number of shares through the employee stock option program and in connection with his service as a director of the Company. Item 4. Purpose of the Transaction On January 21, 2004, the Company agreed to purchase 2,000,000 Shares from Mr. Wille in a privately negotiated transaction at a price of $34.58375 per share, representing an aggregate purchase price of $69,167,500. The per share purchase price represented the closing market price on January 20, 2004, less a negotiated 5.25% discount. The transaction is expected to close on January 26, 2004. The terms of this transaction are set forth in the Stock Purchase and Amendment Agreement dated as of January 21, 2004 (the "Stock Purchase Agreement"). See Item 6. Mr. Wille's sale of shares to the Company was for the purpose of achieving liquidity for a portion of his long-term investment in the Company, the remainder of which he continues to hold. Mr. Wille intends to hold his investment in Factset subject to routine monitoring and review on a continuing basis. Based upon such review and monitoring, he reserves the right to acquire additional Shares, maintain his holdings at current levels or dispose of Shares in one or more underwritten public offerings or in open market or privately negotiated transactions or otherwise. Any such actions will depend upon, among other things, the price levels and availability of or demand for Shares; general market, economic and other conditions; alternative investment opportunities; estate planning and tax considerations; Mr. Wille's assessment of the value to price relationship and other future developments. Except as set forth above under this Item 4, Mr. Wille has no present plans or proposals in his capacity as a stockholder that relate to or would result in any of the matters set forth in subparagraphs (a)-(j) of Item 4 of Schedule 13D. Item 5. Interest in Securities of the Issuer Prior to the above described transaction, Mr. Wille owned 5,604,231 Shares, which constituted 16.3% of the outstanding common stock of Factset. This included, as of January 15, 2004, vested options to acquire an additional 3,600 Shares. Mr. Wille exercises sole voting and dispositive power over such shares. Following completion of the above described transaction, Mr. Wille will own 3,604,231 Shares representing 11.3% of the outstanding common stock of Factset. As of November 25, 2003, Adelaide McManus, Mr. Wille's spouse, owned 295,752 shares of Common Stock. Mr. Wille disclaims beneficial ownership of such shares. During the previous 60 days, Mr. Wille has not acquired any shares of Factset common stock. During the previous 60 days, options held by Mr. Wille to purchase 1,800 shares of Factset common stock have vested. Item 6. Contracts, Arrangements, Understandings or Relationships with Respect to Securities of the Issuer On January 21, 2004, the Company and Mr. Wille entered into the Stock Purchase Agreement pursuant to which the Company will purchase 2,000,000 shares of Common Stock from Mr. Wille. Pursuant to the Registration Rights Agreement, dated June 27, 1996, between Factset and Mr. Wille (the "Registration Rights Agreement"), Mr. Wille may, at any time and from time to time, demand that the Company register for public sale pursuant to the Securities Act of 1933 all or a portion of the Shares he holds. The Stock Purchase Agreement effected certain amendments of the Registration Rights Agreement. The amendments so effected include the Company's grant of an option to the underwriter or underwriters in a registration pursuant to the Registration Rights Agreement under specified circumstances to purchase from the Company's treasury or its authorized and unissued Shares the lesser of 10% of the number of Shares being offered or 300,000 Shares, in respect of any over-allotment of Shares in the offering and a provision the effect of which is to delay any public offering for sale of shares under the Registration Rights Agreement until after April 26, 2004. The foregoing summary of the terms and conditions of the Registration Rights Agreement and the Stock Purchase Agreement is not intended to be complete and is qualified in its entirety by the complete text of such documents, which are included as Exhibits 1 and 2 to this Schedule 13D and are incorporated herein by reference. Item 7. Materials to be Filed as Exhibits Exhibit No. 1 Form of Registration Rights Agreement Exhibit No. 2 Stock Purchase and Amendment Agreement dated as of January 21, 2004 SIGNATURE After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this Schedule 13D is true, complete and accurate. Date: January 22, 2004 HOWARD E. WILLE By: /s/ Howard E. Wille ------------------------------ Name: Howard E. Wille

                                                                     Exhibit 1

                    [Form of Registration Rights Agreement]

                  REGISTRATION RIGHTS AGREEMENT dated as of June ___, 1996,
         between each of HOWARD E. WILLE and CHARLES J. SNYDER, (herein
         referred to collectively as the "Stockholders" and individually as a
         "Stockholder"), and FACTSET RESEARCH SYSTEMS INC. (the "Company").

                  The Stockholders are the beneficial owners of certain shares
of Common Stock, par value $.01 per share, of the Company (the "Common Stock").
In connection with the execution and delivery of this Agreement, the
Stockholders are selling in an underwritten public offering a number of shares
of Common Stock (the "Initial Public Offering"). At any time and from time to
time hereafter, the Stockholders may acquire other classes of securities or
additional shares of Common Stock (all such securities of the Company,
including the Common Stock, being included in the term the "Securities", which
term has the meaning assigned thereto in Section 8(c) hereof). In consideration
of the foregoing and in order to specify certain provisions relating to the
sale by means of domestic or foreign public offerings of Securities owned by
the Stockholders, the parties agree as follows:

                  1. Registration and Listing Rights.

                  (a) Registration. If a Stockholder shall, at any time and
         from time to time, request the Company in writing to register under
         the Securities Act of 1933 (the "Act") any Securities held by it
         (whether for purposes of a public offering, an exchange offer or
         otherwise), the Company shall use all reasonable efforts to cause the
         prompt registration of all Securities specified in such request, and
         in connection therewith shall prepare and file on such appropriate
         form as the Company, in its reasonable discretion, shall determine, a
         registration statement under the Act to effect such registration and
         shall take such actions as shall be necessary or appropriate, in the
         Company's reasonable discretion, to have such Securities listed or
         approved for trading on any securities exchange or through any
         facility on which or through which Securities of such class are
         already traded. If a Stockholder shall so request, the Company will
         register such Securities for offering on a delayed or continuous basis
         pursuant to Rule 415 (or any successor rule or rules to similar
         effect) under the Act. Notwithstanding the foregoing, the Company
         shall be entitled to postpone for a reasonable period of time, but not
         in excess of 90 calendar days, the filing of any registration
         statement otherwise required to be prepared and filed by it under this
         paragraph (a) if (i) the Company determines in good faith that the
         filing of such registration statement would interfere with any pending
         financing, acquisition, corporate reorganization or any other
         corporate development involving the Company or any of its subsidiaries
         or would require premature disclosure thereof and (ii) the Company so
         notifies the requesting Stockholder within 10 days after the
         Stockholder so requests.

                  (b) Other Offers and Sale. If a Stockholder shall, at any
         time and from time to time, request the Company in writing to take
         such actions as shall be necessary or appropriate to permit any
         Securities held by it to be publicly or privately offered and sold in
         compliance with the securities laws or other relevant laws or
         regulations of any foreign jurisdiction, the Company shall use all
         reasonable efforts to take such actions in any such foreign
         jurisdiction (including listing such Securities on any foreign
         securities exchange on which such listing is requested by the
         Stockholder and on which Securities of the same class are already
         traded) and shall otherwise cooperate in a timely manner in such
         offering. Any request under this paragraph (b) may be made separately
         or in conjunction with any request under paragraph (a).
         Notwithstanding the foregoing, the Company shall be entitled to
         postpone for a reasonable period of time, but not in excess of 90
         calendar days, the taking of any actions otherwise required under this
         paragraph (b) if (i) the Company determines in good faith that the
         filing of such registration statement would interfere with any pending
         financing, acquisition, corporate reorganization or any other
         corporate development involving the Company or any of its subsidiaries
         or would require premature disclosure thereof and (ii) the Company so
         notifies the requesting Stockholder within 10 days after the
         Stockholder so requests.

                  (c) Written Notice. Any request by a Stockholder pursuant to
         paragraph (a) or (b) of this Section 1 shall (i) specify the number
         and class of shares or the principal amount, as the case may be, of
         Securities which the Stockholder intends to offer and sell, (ii)
         express the intention of the Stockholder to offer or cause the
         offering of such Securities, (iii) describe the nature or method of
         the proposed offer and sale thereof and state whether such offer shall
         be made domestically or abroad, or both, and, if abroad, the country
         or countries in which such offer shall be made, (iv) specify any
         securities exchange or trading facility on which or through which the
         Stockholder requests that such Securities be listed or approved for
         trading, (v) contain the undertaking of the Stockholder to provide all
         such information regarding its holdings and the proposed manner of
         distribution thereof as may be required in order to permit the Company
         to comply with all applicable laws and regulations, foreign or
         domestic, and all requirements of the Securities and Exchange
         Commission (the "SEC"), any other applicable United States or foreign
         regulatory or self regulatory body and any other body having
         jurisdiction and any securities exchange or trading facility on which
         or through which the Securities are to be listed or traded and to
         obtain acceleration of the effective date of any registration
         statement filed in connection therewith and (vi) in the case of an
         underwritten public offering made domestically or abroad, or both,
         specify the managing underwriter or underwriters of such Securities,
         which shall be selected by the requesting Stockholder.

                  (d) Condition to Exercise of Rights. The obligations of the
         Company under paragraphs (a) and (b) of this Section 1 shall be
         subject to the limitations that the Company shall not be obligated to
         register, take other specified actions with respect to, or cooperate
         in the offering of, Securities upon the request of a Stockholder, (i)
         more than twice in any 12-month period and (ii) unless, in the case of
         a class of equity Securities, the number of shares specified in such
         request pursuant to Section 1(c)(i) shall be greater than 3% of the
         total number of shares of such class at the time issued and
         outstanding (provided that a stockholder owing less than 3% of the
         total number of shares of a class outstanding may request the
         registration of all shares the held by such stockholder), or, in the
         case of a class of debt Securities, the principal amount specified in
         such request pursuant to Section 1(c)(i) shall be at least $1,000,000.
         Notwithstanding the foregoing, the failure of a Stockholder to own the
         minimum number or percent or principal amount of Securities referred
         to in the preceding sentence at any time shall not affect the ability
         of the Stockholder to exercise its rights under this Agreement at any
         subsequent time when the Stockholder again owns such minimum number or
         percent or principal amount.

                  (e) Incidental Registration. If the Company shall, at any
         time and from time to time after the Initial Public Offering, propose
         an underwritten offering for cash of any Securities, whether pursuant
         to a registration statement under the Act or otherwise, the Company
         shall give written notice as promptly as practicable of such proposed
         registration or offering to the Stockholders and shall use its best
         efforts to include in such offering and, if such offering is pursuant
         to a registration statement under the Act, in such registration, any
         of the same class of such Securities held by a Stockholder as a
         Stockholder shall request within 20 calendar days after the giving of
         such notice, upon the same terms (including the method of
         distribution) as such offering; provided, however, that (i) the
         Company shall not be required to give such notice or include any such
         Securities in any offering pursuant to a registration statement filed
         on Form S-8 or Form S-4 (or such other form or forms as shall be
         prescribed under the Act for the same purposes as such forms) or any
         registration statement for a dividend reinvestment or employee stock
         purchase plan and (ii) the Company may at any time prior to the
         effectiveness of any such registration statement or commencement of
         any such offering not pursuant to a registration statement, in its
         sole discretion and without the consent of Stockholders, abandon the
         proposed offering in which a Stockholder had requested to participate.
         Notwithstanding the foregoing, the Company shall not be obligated to
         include such Securities in such offering if the Company is advised in
         writing by its managing underwriter or underwriters (with a copy to
         each requesting Stockholder within 5 days after the delivery of any
         such request pursuant to this paragraph (e) that such offering would
         in its or their opinion be materially adversely affected by such
         inclusion; provided, however, that the Company shall in any case be
         obligated to include such number or amount of Securities in such
         offering as such managing underwriter or underwriters shall determine
         will not materially adversely affect such offering.

                  2. Covenants of the Company. In connection with any offering
         of Securities pursuant to this Agreement, the Company shall:

                  (a) furnish to a Stockholder such number of copies of any
         prospectus (including any preliminary prospectus), registration
         statement, offering memorandum or other offering document (including
         any exhibits thereto or documents referred to therein) as a
         Stockholder may reasonably request and a copy of any and all
         transmittal letters or other correspondence with the SEC or any other
         governmental agency or self-regulatory body or other body having
         jurisdiction (including any securities exchange or trading facility)
         relating to such offering of Securities;

                  (b) take such reasonable action as may be necessary to
         qualify such Securities for offer and sale under the securities, "blue
         sky" or other similar laws of such jurisdictions (including any
         foreign country or political subdivision thereof) as a Stockholder or
         any underwriter shall request;

                  (c) enter into an underwriting agreement (or equivalent
         document in any foreign jurisdiction) containing representations,
         warranties, indemnities, contribution provisions and agreements then
         customarily included by an issuer in underwriting agreements (or such
         equivalent documents) in the form customarily used by the lead
         underwriter with respect to secondary distributions;

                  (d) furnish unlegended certificates representing ownership of
         the Securities being sold in such denominations as shall be requested
         by a Stockholder or the lead underwriter;

                  (e) in the case of any offering of equity Securities,
         instruct the transfer agent and registrar to release any stop transfer
         orders with respect to the equity Securities being sold;

                  (f) promptly inform each requesting Stockholder (i) in the
         case of any domestic offering of Securities in respect of which a
         registration statement is filed under the Act, of the date on which
         such registration statement or any post-effective amendment thereto
         becomes effective (and, in the case of an offering abroad of
         Securities, of the date when any required filing under the securities
         and other laws of such foreign jurisdictions shall have been made and
         when the offering may be commenced in accordance with such laws) and
         (ii) of any request by the SEC, any securities exchange, government
         agency, self-regulatory body or other body having jurisdiction for any
         amendment of or supplement to any registration statement or
         preliminary prospectus or prospectus included therein or any offering
         memorandum or other offering document relating to such offering;

                  (g) upon any registration statement becoming effective
         pursuant to any registration under the Act pursuant to this Agreement,
         file any necessary amendments or supplements to such registration
         statement and otherwise use its best efforts to keep such registration
         statement current for such period as a Stockholder shall request;

                  (h) take such reasonable actions as may be necessary to have
         such Securities listed on or traded through any securities exchange or
         trading facility on which or through which a Stockholder shall request
         such listing or approval pursuant to the notice delivered by the
         Stockholder under Section 1(c) hereof;

                  (i) promptly notify each requesting Stockholder of the
         happening of any event as a result of which any registration statement
         or any preliminary prospectus or prospectus included therein or any
         offering memorandum or other offering document includes an untrue
         statement of a material fact or omits to state any material fact
         required to be stated therein or necessary to make the statements
         therein not misleading in the light of the circumstances then
         existing, and prepare and furnish to such Stockholders as many copies
         of a supplement to or amendment of such offering document which shall
         correct such untrue statement or eliminate such omission, as such
         Stockholders shall reasonably request;

                  (j) appoint a trustee or fiscal agent (in the case of debt
         Securities) and any transfer agent, registrar, depositary,
         authentication agent or other agent as may be reasonably requested by
         a Stockholder; and

                  (k) take such other actions and execute and deliver such
         other documents as may be necessary or reasonably requested by a
         Stockholder in order to give full effect to the rights of the
         Stockholder under this Agreement.

                  3. Expenses. (a) In connection with the first three exercises
         by a Stockholder of his rights under Section 1(a) or (b), the Company
         shall pay all expenses incurred in complying with Section 1(a) or (b)
         hereof, including, without limitation, all registration and filing
         fees (including all expenses incident to any filing with the National
         Association of Securities Dealers, Inc. or listing on or approval for
         trading through any securities exchange or trading facility), fees and
         expenses of complying with securities and "blue sky" laws (including
         those of counsel retained to effect such compliance), printing
         expenses and any stamp, duty or transfer tax (collectively,
         "Registration Expenses"). In connection with each subsequent exercise
         by a Stockholder of his rights under Section 1(a) or (b), the Company
         and the Stockholder shall each pay one-half of the Registration
         Expenses. Notwithstanding the foregoing, (i) a Stockholder shall pay
         all underwriting discounts and commissions, (ii) the Company shall pay
         (x) the fees and disbursements of its independent public accountants
         (including any such fees and expenses incurred in performing any
         special audits required in connection with any such offering and
         incurred in connection with the preparation of pro forma financial
         statements and comfort letters for any such offering), (y) transfer
         agents', trustees', fiscal agents', depositories' and registrars' fees
         and the fees of any other agent appointed in connection with such
         offering and (z) all security engraving and printing expenses and
         (iii) each party shall pay the fees and expenses of its counsel.

(b)      All expenses incurred in complying with Section 1(e) hereof,
         including, without limitation, any Registration Expenses, shall be
         paid by the Company, except that (i) a Stockholder shall pay all
         underwriting discounts, commissions and expenses specifically
         attributable to the inclusion in the offering under said Section 1(e)
         of the Securities being sold by such Stockholder and (ii) each party
         shall pay the fees and expenses of its counsel.

                  4. Indemnification. (a) Company Indemnity. In the case of any
         offering or sale of Securities covered by this Agreement, the Company
         shall indemnify and hold harmless the Stockholders, and each person
         affiliated with or retained by the Stockholders and who may be subject
         to liability under any applicable foreign securities laws, against any
         and all losses, claims, damages or liabilities to which they or any of
         them may become subject under the Act or any other statute or common
         law of the United States of America or any other country or political
         subdivision thereof, or otherwise, including any amount paid in
         settlement of any litigation commenced or threatened (including any
         amounts paid pursuant to or in settlement of claims made under the
         indemnification or contribution provisions of any underwriting or
         similar agreement entered into by the Stockholders in connection with
         any offering or sale of Securities covered by this Agreement), and
         shall promptly reimburse them, as and when incurred, for any legal or
         other expenses incurred by them in connection with investigating any
         claims and defending any actions, insofar as any such losses, claims,
         damages, liabilities or actions shall arise out of or shall be based
         upon any untrue statement or alleged untrue statement of a material
         fact contained in the registration statement (or in any preliminary or
         final prospectus included therein) or in any offering memorandum or
         other offering document relating to the offering and sale of such
         Securities, or the omission or alleged omission to state therein a
         material fact required to be stated therein or necessary to make the
         statements therein not misleading or any violation or alleged
         violation by the Company of the Act, any "blue sky" laws, securities
         laws or other applicable laws of any jurisdiction relating to any
         actual or alleged action or inaction required of the Company in
         connection with such offering; provided, however, that the
         indemnification agreement contained in this Section 4 shall not apply
         to such losses, claims, damages, liabilities or actions to the extent
         that such losses, claims, damages, liabilities or actions shall arise
         out of or shall be based upon any such untrue statement or alleged
         untrue statement, or any such omission shall have been made in
         reliance upon and in conformity with information jointly identified in
         writing by the Company and a Stockholder as concerning such
         Stockholder and its security holdings in the Company and so identified
         for use in connection with the preparation of the registration
         statement or any preliminary prospectus or prospectus contained in the
         registration statement, any offering memorandum or other offering
         document, or any amendment thereof or supplement thereto.
         Notwithstanding the foregoing, no underwriter or selling or placement
         agent shall be entitled to indemnification under this Agreement if
         such person shall have entered into a separate underwriting, agency or
         indemnification agreement with the Company that pertains to the same
         transaction.

                  (b) Stockholder Indemnity. In the case of each offering or
         sale of Securities covered by this Agreement, the requesting
         Stockholder shall, in the same manner and to the same extent as set
         forth in paragraph (a) of this Section 4, indemnify and hold harmless
         the Company and each person, if any, who controls the Company within
         the meaning of Section 15 of the Act, and each person affiliated with
         or retained by the Company and who may be subject to liability under
         any applicable foreign securities laws, its directors and those
         officers of the Company who shall have signed any registration
         statement, offering memorandum or other offering document with respect
         to any statement in or omission from such registration statement, any
         preliminary prospectus or prospectus contained in such registration
         statement or from such offering memorandum or other offering document,
         as amended or supplemented, if such statement or omission shall have
         been made in reliance upon and in conformity with information jointly
         identified in writing by the Company and the Stockholder as concerning
         the Stockholder and its security holdings in the Company and so
         identified for use in connection with the preparation of such
         registration statement, any preliminary prospectus or prospectus
         contained in such registration statement, any offering memorandum or
         other offering document, or any amendment thereof or supplement
         thereto.

                  (c) Procedure for Indemnification. Each party indemnified
         under paragraph (a) or (b) of this Section 4, or under Section 8(f)
         hereof, shall, promptly after receipt of notice of the commencement of
         any action against such indemnified party in respect of which
         indemnity may be sought, notify the indemnifying party in writing of
         the commencement thereof. The omission of any indemnified party so to
         notify an indemnifying party of any such action shall not relieve the
         indemnifying party from any liability in respect of such action which
         it may have to such indemnified party on account of the indemnity
         agreement contained in paragraph (a) or (b) of this Section 4, or
         under Section 8(f) hereof, except to the extent that the indemnifying
         party was prejudiced by such omission, and in no event shall relieve
         the indemnifying party from any other liability which it may have to
         such indemnified party. In case any such action shall be brought
         against any indemnified party and such indemnified party shall notify
         an indemnifying party of the commencement thereof, the indemnifying
         party shall be entitled to participate therein and, to the extent that
         it may wish, jointly with any other indemnifying party similarly
         notified, to assume the defense thereof, with counsel satisfactory to
         such indemnified party. If the indemnifying party so assumes the
         defense thereof, it may not agree to any settlement of any such action
         as the result of which any remedy or relief, other than monetary
         damages for which the indemnifying party shall be responsible
         hereunder, shall be applied to or against the indemnified party,
         without the prior written consent of the indemnified party. If the
         indemnifying party does not assume the defense thereof, it shall be
         bound by any settlement to which the indemnified party agrees,
         irrespective of whether the indemnifying party consents thereto. If
         any settlement of any claim is effected by the indemnified party prior
         to commencement of any action relating thereto, the indemnifying party
         shall be bound thereby only if it has consented in writing thereto. In
         any action hereunder, the indemnified party shall continue to be
         entitled to participate in the defense thereof, with counsel of its
         own choice, even if the indemnifying party has assumed the defense
         thereof, and the indemnifying party shall not be relieved of the
         obligation hereunder to reimburse the indemnified party for the costs
         thereof.

                  5. Transfer of Rights. (a) Subject to paragraph (b) below,
         the rights of a Stockholder under this Agreement with respect to any
         Security may be transferred to any one or more transferee of such
         Security if such transferee (i) is the estate or personal
         representative of such Stockholder, (ii) is controlled by such
         Stockholder or (iii) acquires, either individually or when aggregated
         with other transferees, at least 25% of the aggregate number of shares
         of any class of equity Securities held by such Stockholder on the date
         the Stockholder first acquired any of such equity Securities (which
         for purposes of the Common Stock shall be the time immediately after
         the initial public offering by the Company of the Common Stock) or 25%
         in principal amount of any issue of debt Securities held by such
         Stockholder at the date the Stockholder first acquired any of such
         debt Securities. Any transfer of registration rights pursuant to this
         Section 5 shall be effective only upon receipt by the Company of
         written notice from the Stockholder stating the name and address of
         any transferee and identifying the Securities with respect to which
         the rights under this Agreement are being transferred.

                  (b) The rights of a transferee under paragraph (a) above
         shall be the same rights granted to a Stockholder under this
         Agreement, except that (i) such transferee shall only have the right
         to make one request under paragraph (a) or (b) of Section 1, which may
         be a simultaneous request under paragraphs (a) and (b), and two
         requests under paragraph (e) of Section 1, (ii) all rights referred to
         in the foregoing clause (i) with respect to any particular Securities
         shall expire on the third anniversary of the receipt of such
         Securities by the transferee and (iii) such transferee shall be
         required to pay all (or in the case of a request under Paragraph 1(e)
         such transferee's proportionate share of) the stamp, duty or transfer
         taxes and underwriting discounts and commissions.

                  6. Termination of Obligations. Section 1 of this Agreement
         shall terminate and cease to be of any force and effect in respect of
         a Stockholder at such time as the Stockholder shall first cease
         beneficially to own any of the outstanding Common Stock (the
         "Termination Date"); provided, however, that such termination shall
         not affect the rights of any transferee under Section 5 with regard to
         any Securities transferred prior to the Termination Date.

                  7. Representations and Warranties. As an inducement to enter
         into this Agreement, (a) the Company represents and warrants that:

                     (i) it is a corporation duly organized, validly existing
             and in good standing under the laws of the State of Delaware and
             has all requisite corporate power to own, lease and operate its
             properties, to carry on its business as presently conducted and to
             carry out the transactions contemplated by this Agreement;

                     (ii) it has duly and validly taken all corporate action
             necessary to authorize the execution, delivery and performance of
             this Agreement and the consummation of the transactions
             contemplated hereby;

                     (iii) this Agreement has been duly executed and delivered
             by it and constitutes its legal, valid and binding obligation
             enforceable in accordance with its terms (subject, as to the
             enforcement of remedies, to applicable bankruptcy, reorganization,
             insolvency, moratorium or other similar laws affecting the
             enforcement of creditors' rights generally from time to time in
             effect, and subject to equitable limitations on the availability
             of the remedy of specific performance); and

                     (iv) none of the execution and delivery of this Agreement,
             the consummation of the transactions contemplated hereby or the
             compliance with any of the provisions of this Agreement will (x)
             conflict with or result in a breach of any provision of its
             corporate charter or by-laws, (y) breach, violate or result in a
             default under any of the terms of any agreement or other
             instrument or obligation to which it is a party or by which it or
             any of its properties or assets may be bound, or (z) violate any
             order, writ, injunction, decree, statute, rule or regulation
             applicable to it or affecting any of its properties or assets; and

                  (b) each Stockholder represents and warrants that:

                     (i) this Agreement has been duly executed and delivered by
             such Stockholder and constitutes a legal, valid and binding
             obligation of the Stockholder enforceable in accordance with its
             terms (subject, as to the enforcement of remedies, to applicable
             bankruptcy, reorganization, insolvency, moratorium or other
             similar laws affecting the enforcement of creditors' rights
             generally from time to time in effect, and subject to equitable
             limitations on the availability of the remedy of specific
             performance); and

                     (ii) none of the execution and delivery of this Agreement,
             the consummation of the transactions contemplated hereby or the
             compliance with any of the provisions of this Agreement will (x)
             breach, violate or result in a default under any of the terms of
             any agreement or other instrument or obligation to which such
             Stockholder is a party or by which such Stockholder or such
             Stockholder's properties or assets may be bound or (y) violate any
             order, writ, injunction, decree, statute, rule or regulation
             applicable to such Stockholder or affecting any of its properties
             or assets.

                  8. Certain Agreements and Definitions.

                  (a) Calculation of Amounts. For purposes of this Agreement,
         the amount of any Securities outstanding at any time (and the amount
         of any Securities then beneficially owned by a Stockholder or any
         other person) shall be calculated on the basis of the information
         contained in the Company's most recent report filed with the SEC. For
         purposes of calculating the amount of Securities outstanding at any
         time (and the amount of Securities then beneficially owned by a
         Stockholder or any other person) all outstanding securities
         convertible into or exchangeable for such Securities shall be deemed
         to have been fully converted at such time.

                  (b) "person"; "affiliate". As used in this Agreement, the
         term --"person" shall mean any individual, partnership, corporation,
         trust or other entity. As used in this Agreement, the term "affiliate"
         shall mean, with respect to any specified person, any other person
         that directly, or indirectly through one or more intermediaries,
         controls, or is controlled by, or is under common control with, such
         specified person.

                  (c) "Securities". As used in this Agreement, the term
         "Securities" shall include any security of the Company now owned or
         hereafter acquired by the Stockholders, whether acquired in any
         transaction with the Company or another person, in any
         recapitalization of the Company, as a dividend or other distribution,
         as a result of any "split" or "reverse split", upon conversion or
         exercise of another security of the Company or any other person, or
         otherwise.

                  (d) No Legend. No Security held or to be sold by a
         Stockholder shall bear any legend, nor shall the Company cause or
         permit any transfer agent or registrar appointed by the Company with
         respect to such Security to refuse or fail to effect a transfer or
         registration with respect to such Security, provided that the
         Stockholder provides to the Company a certificate of such Stockholder
         in connection with such transfer or registration to the effect that
         such transfer or registration is not in violation of any applicable
         securities or other law.

                  (e) Stock Books. Except as otherwise provided by law for all
         holders of securities, the Company will not close its stock books or
         other registries against the transfer of any Security held by a
         Stockholder.

                  (f) Securities Exchange Act of 1934. The Company shall at all
         times timely file such information, documents and reports as the SEC
         may require or prescribe under the Securities Exchange Act of 1934
         (the "Exchange Act") and shall provide each Stockholder with two
         copies of each thereof or any other communication with or from the
         SEC. The Company shall, whenever requested by a Stockholder, notify
         such Stockholder in writing whether the Company has, as of the date
         specified by the Stockholder, complied with the Exchange Act reporting
         requirements to which it is subject for such period to such date as
         shall be specified by the Stockholder. The Company acknowledges and
         agrees that one of the purposes of the requirements contained in this
         Section 8(f) is to enable the Stockholders to comply with the current
         public information requirements contained in Paragraph (c) of Rule 144
         under the Act (or any corresponding rule hereafter in effect) should a
         Stockholder ever wish to dispose of any Securities without
         registration under the Act in reliance upon Rule 144. In addition, the
         Company shall take such other measures and file such other
         information, documents and reports as shall hereafter be required by
         the SEC as a condition to the availability of Rule 144. The Company
         covenants, represents and warrants that all such information,
         documents and reports filed with the SEC shall not contain any untrue
         statement of a material fact or fail to state therein a material fact
         required to be stated therein or necessary to make the statements
         contained therein not misleading, and the Company shall indemnify and
         hold each Stockholder and each broker, dealer, underwriter or other
         person acting for a Stockholder (and any controlling person of any of
         the foregoing) harmless from and against any and all claims,
         liabilities, losses, damages, expenses and judgments and shall
         promptly reimburse them, as and when incurred, for any legal or other
         expenses incurred by them in connection with investigating any claim
         and defending any actions insofar as such claims, liabilities, losses,
         damage expenses and judgments arise out of or based upon any breach of
         the foregoing covenants, representations or warranties. The procedure
         for indemnification set forth in Section 4(c) hereof shall apply to
         the indemnification provided under this Section 8(f).

                  (g) Listing. Once initially listed or approved for trading,
         the Company shall maintain in effect any listing of Securities on any
         securities exchange or approved for trading through a trading
         facility, shall make all filings and take all other actions required
         under the rules of such exchange or facility and any applicable
         agreement, shall provide each Stockholder with two copies of each such
         filing or any other communication with such exchange or facility at
         the time at which such filing is made, and shall notify each
         Stockholder of any proceeding or other action taken by such exchange
         or facility or any other person which might have the effect of
         terminating or otherwise changing the status of such listing,
         forthwith upon the occurrence thereof. Notwithstanding the foregoing,
         the Company shall be entitled at any time to terminate any securities
         exchange listing or approval for trading through any trading facility
         for the entirety of any class of Securities.

                  (h) Limitation on Other Securities To Be Registered. In case
         of any registration, offering or sale contemplated by paragraph (a) or
         (b) of Section 1, the Company shall not, without the consent of the
         requesting Stockholder, include in such registration, offering or sale
         any Securities other than those beneficially owned by such
         Stockholder. In case of any registration, offering or sale
         contemplated by paragraph (e) of Section 1, the Company shall be
         entitled to include in such registration, offering or sale any
         Securities other than those being offered by the Company and a
         Stockholder, pro rata, on the basis of the amounts of securities
         covered by all requests of stockholders received by the Company. In
         the case of a transferee under Section 5, the Company shall be
         entitled to include in any registration, offering or sale contemplated
         by Section 1, all transferees making a request under such section and
         at the option of the Company other persons making similar requests,
         pro rata, on the basis of the number of shares or principal amount of
         securities covered by any such request.

                  9. Miscellaneous. (a) Severability. If any term, provision,
         covenant or restriction of this Agreement is held by a court of
         competent jurisdiction to be invalid, void, or unenforceable, the
         remainder of the terms, provisions, covenants and restrictions set
         forth herein shall remain in full force and effect and shall in no way
         be affected, impaired or invalidated, and the parties hereto shall use
         their best efforts to find and employ an alternative means to achieve
         the same or substantially the same result as that contemplated by such
         term, provision, covenant or restriction. It is hereby stipulated and
         declared to be the intention of the parties that they would have
         executed the remaining terms, provisions, covenants and restrictions
         without including any of such which may be hereafter declared invalid,
         void or unenforceable.

                  (b) Assignment. Except as provided otherwise in Section 5
         hereof, and except by operation of law or in connection with the sale
         of all or substantially all the assets of a party hereto, this
         Agreement shall not be assignable, in whole or in part, directly or
         indirectly, by either party hereto without the prior written consent
         of the other, and any attempt to assign any rights or obligations
         arising under this Agreement without such consent shall be void;
         provided, however, that the provisions of this Agreement shall be
         binding upon, inure to the benefit of and be enforceable by the
         Stockholders and the Company (including, solely for purposes of
         Section 4 hereof, their officers and directors) and their respective
         successors and permitted assigns.

                  (c) Further Assurances. Subject to the specific terms of this
         Agreement, each of the Stockholders and the Company shall make,
         execute, acknowledge and deliver such other instruments and documents,
         and take all such other actions, as may be reasonably required in
         order to effectuate the purposes of this Agreement and to consummate
         the transactions contemplated hereby. Subject to the specific terms of
         this Agreement, each of the Stockholders and the Company shall, in
         connection with entering into this Agreement, performing its
         obligations hereunder and taking any and all actions relating hereto,
         comply with all applicable laws, regulations, orders and decrees,
         obtain all required consents and approvals and make all required
         filings with any governmental agency, other regulatory or
         administrative agency, commission or similar authority and promptly
         provide the other with all such information as the other may
         reasonably request in order to be able to comply with the provisions
         of this sentence.

                  (d) Parties in Interest. Except as herein otherwise
         specifically provided, nothing in this Agreement expressed or implied
         is intended or shall be construed to confer any right or benefit upon
         any person, firm or corporation other than the Stockholders and the
         Company and their respective successors and permitted assigns.

                  (e) Waivers, Etc. No failure or delay on the part of a
         Stockholder or the Company in exercising any power or right hereunder
         shall operate as a waiver thereof, nor shall any single or partial
         exercise of any such right or power, or any abandonment or
         discontinuance of steps to enforce such a right or power, preclude any
         other or further exercise thereof or the exercise of any other right
         or power. No modification or waiver of any provision of this Agreement
         nor consent to any departure by a Stockholder or the Company therefrom
         shall in any event be effective unless the same shall be in writing,
         and then such waiver or consent shall be effective only in the
         specific instance and for the specific purpose for which given.

                  (f) Setoff. All payments to be made by either party under
         this Agreement shall be made without setoff, counterclaim or
         withholding, all of which are expressly waived.

                  (g) Changes of Law. If, due to any change in applicable law
         or regulations or the interpretation thereof by any court of law or
         other governing body having jurisdiction subsequent to the date of
         this Agreement, performance of any provision of this Agreement or any
         transaction contemplated hereby shall become impracticable or
         impossible, the parties hereto shall use their best efforts to find
         and employ an alternative means to achieve the same or substantially
         the same result as that contemplated by such provision.

                  (h) Confidentiality. Subject to any contrary requirement of
         law and the right of a party to enforce its rights hereunder in any
         legal action, each party shall keep strictly confidential and shall
         cause its employees and agents to keep strictly confidential, any
         information which it or any of its agents or employees may acquire
         pursuant to, or in the course of performing its obligations under, any
         provision of this Agreement; provided, however, that such obligations
         to maintain confidentiality shall not apply to information which (i)
         at the time of disclosure was in the public domain not as a result of
         acts by the receiving party or (ii) was in the possession of the
         receiving party at the time of disclosure.

                  (i) Entire Agreement. This Agreement contains the entire
         understanding of the parties with respect to the transactions
         contemplated hereby.

                  (j) Headings. Descriptive headings are for convenience only
         and shall not control or affect the meaning or construction of any
         provision of this Agreement.

                  (k) Counterparts. For the convenience of the parties, any
         number of counterparts of this Agreement may be executed by the
         parties hereto, and each such executed counterpart shall be, and shall
         be deemed to be, an original instrument.

                  (l) Notices. All notices, consents, requests, instructions,
         approvals and other communications provided for herein shall be
         validly given, made or served, if in writing and delivered personally,
         by telegram or sent by registered mail, postage prepaid, to:

         the Company at:   One Greenwich Plaza
                                    Greenwich, CT 06830

         the Stockholders at:       One Greenwich Plaza
                                    Greenwich, CT 06830
                                    Attention of Mr. Howard E. Wille

                                                     or

                                    One Greenwich Plaza
                                    Greenwich, CT 06830
                                    Attention of Mr. Charles J. Snyder

         or to such other address as any party may, from time to time,
         designate in a written notice given in a like manner. Notice given by
         telegram shall be deemed delivered when received by the recipient.
         Notice given by mail as set out above shall be deemed delivered five
         calendar days after the date the same is mailed.

                  (m) Governing Law. This Agreement shall be governed by and
         construed and enforced in accordance with the laws of the State of
         Connecticut applicable to contracts made and to be performed therein.

                  IN WITNESS WHEREOF, the Stockholder and the Company have duly
executed this Agreement as of the day and year first above written.


                                 ________________________________
                                          HOWARD E. WILLE


                                 _________________________________
                                          CHARLES J. SNYDER


                                 FACTSET RESEARCH SYSTEM INC.,

                                     by


                                     ___________________________
                                     Name:
                                     Title:



                                                                      Exhibit 2


                                 STOCK PURCHASE
                             AND AMENDMENT AGREEMENT

                  STOCK PURCHASE AND AMENDMENT AGREEMENT, dated as of January
21, 2004 (the "Agreement"), between Howard E. Wille (the "Stockholder" or
"Wille") and Factset Research Systems Inc., a Delaware corporation (the
"Company").


                             W I T N E S S E T H:

                  WHEREAS, Wille and the Company are parties to the
Registration Rights Agreement dated June 27, 1996 (the "Registration Rights
Agreement"), pursuant to which Wille may, at any time and from time to time,
demand that the Company register pursuant to the Securities Act of 1933, as
amended, those shares of Company common stock, $.01 par value per share,
("Common Stock") held by Wille, and the Company is obligated to use all
reasonable efforts to cause the prompt registration of Common Stock specified
in such request;

                  WHEREAS, Wille has informed the Company he might wish to
present a demand to the Company for the registration of shares of Common
Stock;

                  WHEREAS, the parties hereto deem Wille to have submitted a
written registration rights demand, dated as of the Closing Date (as defined
herein), covering the Shares (as herein defined) pursuant to Section 1(a) of
the Registration Rights Agreement;

                  WHEREAS, the parties hereto deem the Company to have
exercised its right, pursuant to section 1(a) of the Registration Rights
Agreement, to postpone for up to 90 days the filing of the registration
statement it would otherwise be required to file pursuant to the Wille
registration rights demand; and

                  WHEREAS, the Company desires to purchase, and Wille desires
to sell or cause to be sold to the Company, 2,000,000 shares of Common Stock
held by Wille as of the Closing Date;

                  NOW, THEREFORE, the parties, in consideration of the mutual
covenants and agreements to be performed as hereinafter set forth, and for
other good and sufficient consideration, the receipt of which is hereby
acknowledged, agree as follows:

                  1. PURCHASE AND SALE OF SHARES.

         (a) On the Closing Date the Company shall purchase from Wille, and
Wille shall sell to the Company, 2,000,000 shares of Common Stock (herein
referred to as the "Shares").

         (b) The purchase price payable by the Company for the Shares shall be
$34.58375 per Share or an aggregate amount of $69,167,500, in cash (the
"Aggregate Purchase Price").

         (c) The closing of the purchase and sale of the Shares (the
"Closing") shall take place at 10:00 AM EST on January 26, 2004 (the "Closing
Date"), or at such other time as Wille and the Company may agree to in
writing. At the Closing, the Company shall deliver the Aggregate Purchase
Price to Wille against receipt of which Wille shall deliver the Shares to the
Company. Delivery of the Aggregate Purchase Price shall be by wire transfer of
immediately available funds to the account designated in writing by Wille.
Delivery of the Shares shall be by transfer of a valid security entitlement to
the securities account designated by the Company.

         (d) As of the Closing Date, (i) Wille shall be deemed properly and
with full legal effect to have submitted a written demand for registration of
the Shares, and (ii) the Company shall be deemed properly and with full legal
effect to have postponed for a reasonable period of time, but not in excess of
90 calendar days from the Closing Date, the filing of the registration
statement otherwise deemed to be required to be prepared and filed in
accordance with the Wille demand for registration of the Shares. 2.
OVER-ALLOTMENT OPTION. The Registration Rights Agreement is hereby amended,
effective as of the date as of which this Agreement is being executed and
delivered, by inserting the following immediately following Section (2)(k):


     Section 2(l):  Over-allotment Option.

     If the Stockholder Howard E. Wille ("Wille") shall so request, in
     connection with a registration demand pursuant to Section 1 hereof, the
     Company shall grant the underwriters of the offering to be made in
     respect of such registration demand the option to purchase Common Stock
     from its treasury or its authorized unissued shares up to the lesser of
     10% of the number of shares covered by the registration demand or 300,000
     shares in respect of any over-allotment option (a "Green Shoe") for such
     offering.

                  3. REPRESENTATIONS AND WARRANTIES

         a. Representations and Warranties by the Company. The Company
represents and warrants to Wille that:

                  (i) Organization. The Company is duly organized, validly
existing and in good standing under the laws of the State of Delaware and has
all requisite corporate or other power and authority and all necessary
governmental approvals to own, lease and operate its properties and to carry
on its business as currently conducted, except to the extent that the failure
to be in good standing or to have such approvals would not reasonably be
expected to have a material adverse effect on the Company and its
subsidiaries, taken as a whole.

                  (ii) Authorization; Validity of First Amendment. The
execution, delivery and performance by the Company of this Agreement and the
consummation of the transactions contemplated hereby have been duly authorized
by the Company, and no other corporate or other action on the part of the
Company or its Board of Directors is necessary to authorize the execution and
delivery by the Company of this Agreement or the consummation of the
transactions contemplated hereby and no vote of, or consent by, the holders of
any class or series of securities issued by the Company is necessary to
authorize the execution and delivery by the Company of this Agreement or the
consummation of the transactions contemplated hereby.

                  (iii) Consents; Approvals; Violations of Contracts or Laws.
The execution and delivery by the Company of, and the performance by the
Company of its obligations under, this Agreement will not violate (i) any
provision of applicable law, (ii) the certificate of incorporation or by-laws
of the Company, (iii) any agreement or other instrument binding upon the
Company or any of its subsidiaries that is material to the Company and its
subsidiaries, taken as a whole or (iv) any judgment, order or decree of any
governmental body, agency or court applicable to the Company or any of its
subsidiaries, except, in the cases of clauses (i), (iii) and (iv), for
violations that would not reasonably be expected to have a material adverse
effect on the company and its subsidiaries, taken as a whole, or the Company's
ability to perform its obligations hereunder; and no consent, approval,
authorization or order of, or qualification with, any governmental body or
agency or other person or third party is required for the performance by the
Company of its obligations under this Agreement.

         (b) Representations and Warranties by Wille. Wille represents and
warrants to the Company that:

                  (i) Share Ownership. As of the Closing Date, he owns the
Shares free and clear of all liens and encumbrances.

                  (ii) Authorization; Execution; Delivery. This Agreement has
been duly executed and delivered by Wille, and Wille has any authorization and
approval required by law to consummate the transactions contemplated hereby.

                  (iii) Consents; Approvals; Violations of Contracts or Laws.
The execution and delivery by Wille of, and the performance by Wille of his
obligations under, this Agreement, will not violate (i) any provision of
applicable law, (ii) any agreement or other instrument binding upon him or
(iii) any judgment, order or decree of any governmental body, agency or court
applicable to him, except for violations that would not reasonably be expected
to have a material adverse effect on his ability to perform his obligations
hereunder.

                  4. SUCCESSORS AND ASSIGNS. This Agreement shall be binding
upon, and inure to the benefit of, the parties hereto and their respective
successors and permitted assigns.

                  5. ENTIRE AMENDMENT; NO THIRD PARTY BENEFICIARIES. The
Agreement and the Registration Rights Agreement as amended hereby (a)
constitute the entire agreement between the parties with respect to the
subject matter hereof and supersede all prior amendments and understandings,
both written and oral, with respect to such matters and (b) are not intended
to confer upon any person other than Wille and the Company any rights or
remedies hereunder.

                  6. SEVERABILITY. If any provision of this Agreement is held
to be illegal, invalid or unenforceable under any present or future applicable
law or order, and if the rights or obligations of any party under this
Agreement will not be materially and adversely affected thereby, (i) such
provision will be fully severable, (ii) this Agreement will be construed and
enforced as if such illegal, invalid or unenforceable provision had never
comprised a part hereof, and (iii) the remaining provisions of this Agreement
will remain in full force and effect and will not be affected by any such
illegal, invalid or unenforceable provision or by its severance herefrom.

                  7. AGREEMENT TO REMAIN IN FULL FORCE AND EFFECT. Except as
amended hereby, the Registration Rights Agreement shall remain in full force
and effect and is hereby ratified, adopted and confirmed in all respects. This
Agreement shall be deemed to be an amendment to the Registration Rights
Agreement. All references in the Registration Rights Agreement to "this
Agreement", "hereunder", "hereof", "herein", or words of like import, and all
references to the Registration Rights Agreement in any other agreement or
document shall hereafter be deemed to refer to the Registration Rights
Agreement as amended hereby.

                  8. COUNTERPARTS. This Agreement may be executed in one or
more counterparts, each of which when so executed and delivered shall be
deemed an original, but such counterparts shall together constitute one and
the same. Each counterpart may consist of a number of copies hereof and each
signed by less than all, but together signed by all, of the parties.

                 [remainder of page intentionally left blank]

IN WITNESS WHEREOF, the parties have executed this Agreement as of the date first written above. FACTSET RESEARCH SYSTEMS INC. By: /s/ Philip A. Hadley --------------------------------------- Name: Philip A. Hadley Title: Chairman of the Board and Chief Executive Officer HOWARD E. WILLE By: /s/ Howard E. Wille --------------------------------------- Name: Howard E. Wille