================================================================================

                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                  SCHEDULE 13D

                                 AMENDMENT NO. 2

                   Under the Securities Exchange Act of 1934*


                   Gartner, Inc. (f/k/a Gartner Group, Inc.)
- --------------------------------------------------------------------------------
                                (Name of Issuer)


                Class A Common Stock, par value $0.0005 per share
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)


                                   366651107
- --------------------------------------------------------------------------------
                                 (CUSIP Number)


                              George F. Hamel, Jr.
                               VA Partners, L.L.C.
                               One Maritime Plaza
                                   Suite 1400
                         San Francisco, California 94111
                                 (415) 362-3700
- --------------------------------------------------------------------------------
(Name, Address and Telephone Number of Person Authorized to Receive Notices and
                                Communications)


                                 August 29, 2001
- --------------------------------------------------------------------------------
             (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  that is the subject of this  Schedule  13D, and is filing this
schedule because of ss.ss. 240.13d-1(b)(e),  240.13d-1(f) or 240.13d-1(g), check
the following box. [ ]

NOTE:  Schedules  filed in paper format shall include a signed original and five
copies of the schedule,  including all exhibits.  See ss. 240.13d-7(b) for other
parties to whom copies are to be sent.

*The  remainder of this cover page shall be filled out for a reporting  person's
initial filing on this form with respect to the subject class of securities, and
for  any  subsequent   amendment   containing   information  which  would  alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the  Securities  Exchange  Act of
1934 ("Act") or otherwise  subject to the liabilities of that section of the Act
but  shall be  subject  to all other  provisions  of the Act  (however,  see the
Notes).

================================================================================

SCHEDULE 13D - -------------------------- ------------------------ CUSIP No. 366651107 Page 2 of 14 - -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSON/S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (entities only) ValueAct Capital Partners, L.P - -------------------------------------------------------------------------------- 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (A) [X] (B) [ ] - -------------------------------------------------------------------------------- 3. SEC USE ONLY - -------------------------------------------------------------------------------- 4. SOURCE OF FUNDS WC* - -------------------------------------------------------------------------------- 5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(D) OR 2(E) [ ] - -------------------------------------------------------------------------------- 6. CITIZENSHIP OR PLACE OF ORGANIZATION Delaware - -------------------------------------------------------------------------------- 7. SOLE VOTING POWER 0 NUMBER OF -------------------------------------------------- SHARES 8. SHARED VOTING POWER BENEFICIALLY OWNED BY 5,168,200** EACH -------------------------------------------------- REPORTING 9. SOLE DISPOSITIVE POWER PERSON WITH: 0 -------------------------------------------------- 10. SHARED DISPOSITIVE POWER 5,168,200** - -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 5,168,200** - -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES* [ ] - -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 9.7% - -------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON PN ================================================================================ *See Item 3 **See Item 2 and 5 *SEE INSTRUCTIONS BEFORE FILLING OUT! INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7 (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE ATTESTATION.

SCHEDULE 13D - -------------------------- ------------------------ CUSIP No. 366651107 Page 3 of 14 - -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSON/S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (entities only) ValueAct Capital Partners II, L.P - -------------------------------------------------------------------------------- 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (A) [X] (B) [ ] - -------------------------------------------------------------------------------- 3. SEC USE ONLY - -------------------------------------------------------------------------------- 4. SOURCE OF FUNDS WC* - -------------------------------------------------------------------------------- 5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(D) OR 2(E) [ ] - -------------------------------------------------------------------------------- 6. CITIZENSHIP OR PLACE OF ORGANIZATION Delaware - -------------------------------------------------------------------------------- 7. SOLE VOTING POWER 0 NUMBER OF -------------------------------------------------- SHARES 8. SHARED VOTING POWER BENEFICIALLY OWNED BY 477,650** EACH -------------------------------------------------- REPORTING 9. SOLE DISPOSITIVE POWER PERSON WITH: 0 -------------------------------------------------- 10. SHARED DISPOSITIVE POWER 477,650** - -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 477,650** - -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES* [ ] - -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 0.9% - -------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON PN ================================================================================ *See Item 3 **See Item 2 and 5 *SEE INSTRUCTIONS BEFORE FILLING OUT! INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7 (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE ATTESTATION.

SCHEDULE 13D - -------------------------- ------------------------ CUSIP No. 366651107 Page 4 of 14 - -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSON/S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (entities only) ValueAct Capital International Ltd. - -------------------------------------------------------------------------------- 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (A) [X] (B) [ ] - -------------------------------------------------------------------------------- 3. SEC USE ONLY - -------------------------------------------------------------------------------- 4. SOURCE OF FUNDS WC* - -------------------------------------------------------------------------------- 5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(D) OR 2(E) [ ] - -------------------------------------------------------------------------------- 6. CITIZENSHIP OR PLACE OF ORGANIZATION British Virgin Islands - -------------------------------------------------------------------------------- 7. SOLE VOTING POWER 0 NUMBER OF -------------------------------------------------- SHARES 8. SHARED VOTING POWER BENEFICIALLY OWNED BY 113,350** EACH -------------------------------------------------- REPORTING 9. SOLE DISPOSITIVE POWER PERSON WITH: 0 -------------------------------------------------- 10. SHARED DISPOSITIVE POWER 113,350** - -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 113,350** - -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES* [ ] - -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 0.2% - -------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON PN ================================================================================ *See Item 3 **See Item 2 and 5 *SEE INSTRUCTIONS BEFORE FILLING OUT! INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7 (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE ATTESTATION.

SCHEDULE 13D - -------------------------- ------------------------ CUSIP No. 366651107 Page 5 of 14 - -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSON/S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (entities only) VA Partners, L.L.C. - -------------------------------------------------------------------------------- 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (A) [X] (B) [ ] - -------------------------------------------------------------------------------- 3. SEC USE ONLY - -------------------------------------------------------------------------------- 4. SOURCE OF FUNDS WC* - -------------------------------------------------------------------------------- 5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(D) OR 2(E) [ ] - -------------------------------------------------------------------------------- 6. CITIZENSHIP OR PLACE OF ORGANIZATION Delaware - -------------------------------------------------------------------------------- 7. SOLE VOTING POWER 0 NUMBER OF -------------------------------------------------- SHARES 8. SHARED VOTING POWER BENEFICIALLY OWNED BY 5,759,200** EACH -------------------------------------------------- REPORTING 9. SOLE DISPOSITIVE POWER PERSON WITH: 0 -------------------------------------------------- 10. SHARED DISPOSITIVE POWER 5,759,200** - -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 5,759,200** - -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES* [ ] - -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 10.8% - -------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON 00(LLC) ================================================================================ *See Item 3 **See Item 2 and 5 *SEE INSTRUCTIONS BEFORE FILLING OUT! INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7 (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE ATTESTATION.

SCHEDULE 13D - -------------------------- ------------------------ CUSIP No. 366651107 Page 6 of 14 - -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSON/S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (entities only) Jeffrey W. Ubben - -------------------------------------------------------------------------------- 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (A) [X] (B) [ ] - -------------------------------------------------------------------------------- 3. SEC USE ONLY - -------------------------------------------------------------------------------- 4. SOURCE OF FUNDS 00* - -------------------------------------------------------------------------------- 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 - -------------------------------------------------------------------------------- 7. SOLE VOTING POWER 0 NUMBER OF -------------------------------------------------- SHARES 8. SHARED VOTING POWER BENEFICIALLY OWNED BY 5,759,200** EACH -------------------------------------------------- REPORTING 9. SOLE DISPOSITIVE POWER PERSON WITH: 0 -------------------------------------------------- 10. SHARED DISPOSITIVE POWER 5,759,200** - -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 5,759,200** - -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES* [ ] - -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 10.8% - -------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON IN ================================================================================ *See Item 3 **See Item 2 and 5 *SEE INSTRUCTIONS BEFORE FILLING OUT! INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7 (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE ATTESTATION.

SCHEDULE 13D - -------------------------- ------------------------ CUSIP No. 366651107 Page 7 of 14 - -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSON/S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (entities only) George F. Hamel, Jr. - -------------------------------------------------------------------------------- 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (A) [X] (B) [ ] - -------------------------------------------------------------------------------- 3. SEC USE ONLY - -------------------------------------------------------------------------------- 4. SOURCE OF FUNDS 00* - -------------------------------------------------------------------------------- 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 - -------------------------------------------------------------------------------- 7. SOLE VOTING POWER 0 NUMBER OF -------------------------------------------------- SHARES 8. SHARED VOTING POWER BENEFICIALLY OWNED BY 5,759,200** EACH -------------------------------------------------- REPORTING 9. SOLE DISPOSITIVE POWER PERSON WITH: 0 -------------------------------------------------- 10. SHARED DISPOSITIVE POWER 5,759,200** - -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 5,759,200** - -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES* [ ] - -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 10.8% - -------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON IN ================================================================================ *See Item 3 **See Item 2 and 5 *SEE INSTRUCTIONS BEFORE FILLING OUT! INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7 (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE ATTESTATION.

SCHEDULE 13D - -------------------------- ------------------------ CUSIP No. 366651107 Page 8 of 14 - -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSON/S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (entities only) Peter H. Kamin - -------------------------------------------------------------------------------- 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (A) [X] (B) [ ] - -------------------------------------------------------------------------------- 3. SEC USE ONLY - -------------------------------------------------------------------------------- 4. SOURCE OF FUNDS 00* - -------------------------------------------------------------------------------- 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 - -------------------------------------------------------------------------------- 7. SOLE VOTING POWER 0 NUMBER OF -------------------------------------------------- SHARES 8. SHARED VOTING POWER BENEFICIALLY OWNED BY 5,759,200** EACH -------------------------------------------------- REPORTING 9. SOLE DISPOSITIVE POWER PERSON WITH: 0 -------------------------------------------------- 10. SHARED DISPOSITIVE POWER 5,759,200** - -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 5,759,200** - -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES* [ ] - -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 10.8% - -------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON IN ================================================================================ *See Item 3 **See Item 2 and 5 *SEE INSTRUCTIONS BEFORE FILLING OUT! INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7 (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE ATTESTATION.

THE PURPOSE OF THIS AMENDMENT NO. 2 TO SCHEDULE 13D IS TO AMEND THE SCHEDULE 13D FILED BY THE REPORTING PERSONS ON APRIL 17, 2001. THE INFORMATION BELOW SUPPLEMENTS THE INFORMATION PREVIOUSLY PROVIDED. ITEM 1. SECURITY AND ISSUER. This Schedule 13D relates to the Class A common stock, $0.0005 par value per share (the "Common Stock"), of Gartner, Inc. (f/k/a Gartner Group, Inc.), a Delaware corporation (the "Issuer). The address of the principal executive offices of the Issuer is 56 Top Gallant Road, Stamford, Connecticut 06904-2212. ITEM 2. IDENTITY AND BACKGROUND. This Statement is filed jointly by (a) ValueAct Capital Partners, L.P. ("ValueAct Partners"), (b) ValueAct Capital Partners II, L.P. ("ValueAct Partners II"), (c) ValueAct Capital International, Ltd. ("ValueAct International"), (d) VA Partners, L.L.C. ("VA Partners"), (e) Jeffrey W. Ubben, (f) George F. Hamel, Jr. and (g) Peter H. Kamin (collectively, the "Reporting Persons"). ValueAct Partners and ValueAct Partners II are each Delaware limited partnerships. ValueAct International is a company organized in the British Virgin Islands. The principal business of each such entity is investing in securities. Each has a principal business address of One Maritime Plaza, Suite 1400, San Francisco, California 94111. VA Partners is a Delaware limited liability company, the principal business of which is to render investment management services to ValueAct International and to serve as the General Partner of ValueAct Partners and ValueAct Partners II. VA Partners has a principal business address of One Maritime Plaza, Suite 1400, San Francisco, California 94111. (a), (b) and (c). Messers. Ubben, Hamel and Kamin are each managing members, principal owners and controlling persons of VA Partners, and such activities constitute their principal occupations. Such individuals are sometimes collectively referred to herein as the "Managing Members" or individually as a "Managing Member". Each Managing Member is a United States citizen and has a principal business address of One Maritime Plaza, Suite 1400, San Francisco, California 94111. (d) and (e). None of the entities or persons identified in this Item 2 has during the past five years been convicted of any criminal proceeding (excluding traffic violations or similar misdemeanors), nor been a party to a civil proceeding of a judicial or administrative body of competent jurisdiction and as a result of such proceeding was or is subject to a judgment, decree or final order enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws or finding any violation with respect to such laws. ITEM 3. SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION. The source of funds used for the purchase of the Common Stock was the working capital of ValueAct Partners, ValueAct Partners II and ValueAct International. The aggregate funds used by such Reporting Persons to make such purchases were $15,561,000, $1,262,170 and $466,830, respectively. Page 9 of 14

ITEM 4. PURPOSE OF TRANSACTION. The Reporting Persons have acquired the Common Stock for investment purposes, and such purchases have been made in the Reporting Persons' ordinary course of business. In pursuing such investment purposes, the Reporting Persons may further purchase, hold, vote, trade, dispose or otherwise deal in the Common Stock at times, and in such manner, as they deem advisable to benefit from changes in market prices of such Common Stock, changes in the Issuer's operations, business strategy or prospects, or from sale or merger of the Issuer. To evaluate such alternatives, the Reporting Persons will routinely monitor the Issuer's operations, prospects, business development, management, competitive and strategic matters, capital structure, and prevailing market conditions, as well as alternative investment opportunities, liquidity requirements of the Reporting Persons and other investment considerations. Consistent with their investment research methods and evaluation criteria, the Reporting Persons may discuss such matters with management or directors of the Issuer, other shareholders, industry analysts, existing or potential strategic partners or competitors, investment and financing professionals, sources of credit and other investors. Such factors and discussions may materially affect, and result in, the Reporting Persons' modifying their ownership of Common Stock, exchanging information with the Issuer pursuant to appropriate confidentiality or similar agreements, proposing changes in the Issuer's operations, governance or capitalization, or in proposing one or more of the other actions described in subsections (a) through (j) of this Item 4. The Reporting Persons reserve the right to formulate other plans and/or make other proposals, and take such actions with respect to their investment in the Issuer, including any or all of the actions set forth in paragraphs (a) through (j) of Item 4 of Schedule 13D, or acquire additional Common Stock or dispose of all the Common Stock beneficially owned by them, in public market or privately negotiated transactions. The Reporting Persons may at any time reconsider and change their plans or proposals relating to the foregoing. ITEM 5. INTEREST IN SECURITIES OF THE ISSUER. (a), (b). Set forth below is the beneficial ownership of shares of Common Stock for each person named in Item 2. Shares reported as beneficially owned by each of ValueAct Partners, ValueAct Partners II and ValueAct International are also reported as beneficially owned by VA Partners, as investment manager or General Partner of each of such investment partnerships, and by the Managing Members as controlling persons of the General Partner. VA Partners and the Managing Members also, directly or indirectly, may own interests in one or both of such partnerships from time to time. Unless otherwise indicated below, by reason of such relationships each of the partnerships is reported as having shared power to vote or to direct the vote, and shared power to dispose or direct the disposition of, such shares of Common Stock with VA Partners and the Managing Members. VA Partners and the Managing Members disclaim beneficial ownership of the shares of Common Stock held by each of ValueAct Partners, ValueAct Partners II and ValueAct International, except insofar as each such Reporting Person may have a pecuniary interest in such Shares, within the meaning of applicable regulations under the Securities Exchange Act of 1934. Page 10 of 14

ValueAct Partners is the beneficial owner of 5,168,200 shares of Common Stock, representing approximately 9.7% of the Issuer's outstanding Common Stock. ValueAct Partners II is the beneficial owner of 477,650 shares of Common Stock, representing approximately 0.9% of the Issuer's outstanding Common Stock. ValueAct International is the beneficial owner of 113,350 shares of Common Stock, representing approximately 0.2% of the Issuer's outstanding Common Stock. VA Partners and each of the Managing Members may be deemed the beneficial owner of an aggregate of 5,759,200 shares of Issuer Common Stock, representing approximately 10.8% of the Issuer's outstanding Common Stock. All percentages set forth in this Form 13D are based upon the Issuer's Report of Form 10-Q for the quarter ended June 30, 2001 which reported outstanding shares of Common Stock of 53,378,250. (c) The following transactions in the Common Stock were effected by the Reporting Persons during the sixty (60) days preceding the date of this report. On August 29, 2001 the Reporting Persons acquired shares in the Common Stock along with several institutional investors, including Farallon Capital Management, High Rock Asset Management and others, through a direct placement from IMS Health. REPORTING PERSON TRADE DATE SHARES PRICE/SHARE - ---------------- ---------- ------ ------------ ValueAct Partners 8/29/01 1,575,000 9.88 ValueAct Partners II 8/29/01 127,750 9.88 ValueAct International 8/29/01 47,250 9.88 (d) and (e). Not applicable. ITEM 6. CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH RESPECT TO SECURITIES OF THE ISSUER. In addition to the Class A Common Stock of the Issuer reported on herein, each of ValueAct Partners, ValueAct Partners II and ValueAct International also owns Class B Common Stock, $0.0005 par value per share, of the Issuer. The aggregate number of such Class B shares beneficially owned by the Reporting Persons is 2,179,950, 165,600 and 88,550, respectively. Other than such Class B shares and as described elsewhere in this Report, the Reporting Persons have no understandings, arrangements, relationships or contracts relating to the Issuer's Common Stock and which are required to be described hereunder. ITEM 7. MATERIAL TO BE FILED AS EXHIBITS. 1. Joint Filing Agreement. Page 11 of 14

SIGNATURE After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct. POWER OF ATTORNEY KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears below on this Schedule 13D hereby constitutes and appoints Jeffrey W. Ubben, George F. Hamel, Jr. and Peter H. Kamin, and each of them, with full power to act without the other, his true and lawful attorney-in-fact and agent, with full power of substitution and resubstitution, for him and in his name, place and stead, in any and all capacities (until revoked in writing) to sign any and all amendments to this Schedule 13D, and to file the same, with all exhibits thereto and other documents in connection therewith, with the Securities and Exchange Commission, granting unto said attorneys-in-fact and agents, and each of them, full power and authority to do and perform each and every act and thing requisite and necessary fully to all intents and purposes as he might or could do in person, thereby ratifying and confirming all that said attorneys-in-fact and agents or any of them, or their or his substitute or substitutes, may lawfully do or cause to be done by virtue hereof. ValueAct Capital Partners L.P., by VA Partners, L.L.C., its General Partner By: /s/ George F. Hamel, Jr. -------------------------------------- Dated: August 31, 2001 George F. Hamel, Jr., Managing Member ValueAct Capital Partners II L.P., by VA Partners, L.L.C., its General Partner By: /s/ George F. Hamel, Jr. -------------------------------------- Dated: August 31, 2001 George F. Hamel, Jr., Managing Member ValueAct Capital International, Ltd., by VA Partners, L.L.C., its investment manager By: /s/ George F. Hamel, Jr. -------------------------------------- Dated: August 31, 2001 George F. Hamel, Jr., Managing Member Page 12 of 14

VA Partners, L.L.C. By: /s/ George F. Hamel, Jr. -------------------------------------- Dated: August 31, 2001 George F. Hamel, Jr., Managing Member /s/ Jeffrey W. Ubben -------------------------------------- Dated: August 31, 2001 Jeffrey W. Ubben /s/ George F. Hamel, Jr. -------------------------------------- Dated: August 31, 2001 George F. Hamel, Jr. /s/ Peter H. Kamin -------------------------------------- Dated: August 31, 2001 Peter H. Kamin Page 13 of 14

Exhibit 1 JOINT FILING AGREEMENT The undersigned parties hereby agree that the Schedule 13D filed herewith (and any amendments thereto) relating to the Class A Common Stock of Gartner Group, Inc. is being filed jointly on behalf of each of them with the Securities and Exchange Commission pursuant to Section 13(d) of the Securities Exchange Act of 1934, as amended. ValueAct Capital Partners L.P., by VA Partners, L.L.C., its General Partner By: /s/ George F. Hamel, Jr. -------------------------------------- Dated: August 31, 2001 George F. Hamel, Jr., Managing Member ValueAct Capital Partners II L.P., by VA Partners, L.L.C., its General Partner By: /s/ George F. Hamel, Jr. -------------------------------------- Dated: August 31, 2001 George F. Hamel, Jr., Managing Member ValueAct Capital International, Ltd. by VA Partners, L.L.C., its investment manager By: /s/ George F. Hamel, Jr. -------------------------------------- Dated: August 31, 2001 George F. Hamel, Jr., Managing Member VA Partners, L.L.C. By: /s/ George F. Hamel, Jr. -------------------------------------- Dated: August 31, 2001 George F. Hamel, Jr., Managing Member /s/ Jeffrey W. Ubben -------------------------------------- Dated: August 31, 2001 Jeffrey W. Ubben /s/ George F. Hamel, Jr. -------------------------------------- Dated: August 31, 2001 George F. Hamel, Jr. /s/ Peter H. Kamin -------------------------------------- Dated: August 31, 2001 Peter H. Kamin Page 14 of 14