UNITED STATES
                      SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, DC 20549

                                ----------------

                                 SCHEDULE 13D
                  Under the Securities Exchange Act of 1934
                              (Amendment No. 2)*



                                GARTNER, INC.
                                -------------
                               (Name of Issuer)



               Class A Common Stock, Par Value $.0005 Per Share
               ------------------------------------------------
                        (Title of Class of Securities)


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



                             Silver Lake Partners
                        2725 Sand Hill Road, Suite 150
                             Menlo Park, CA 94025
                                (650) 233-8120
                                --------------
                 (Name, Address and Telephone Number of Person
               Authorized to Receive Notices and Communications)


                                June 17, 2004
                                -------------
             (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 Sections 240.13d-1(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 Section 240.13d-7 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).



CUSIP No.366651107                   13D                   Page 2 of 10 Pages

- -------------------------------------------------------------------------------
1    NAME OF REPORTING PERSONS. SILVER LAKE PARTNERS, L.P., a Delaware Limited
     partnership.
     I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY).  Not
     required.

- -------------------------------------------------------------------------------
2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)
        (a) [X]
        (b) [_]

- -------------------------------------------------------------------------------
3    SEC USE ONLY



- -------------------------------------------------------------------------------
4    SOURCE OF FUNDS (See Instructions)



- -------------------------------------------------------------------------------
5    CHECK 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

  NUMBER OF

   SHARES      _________________________________________________________________
               8    SHARED VOTING POWER              37,773,001*
BENEFICIALLY

  OWNED BY
               -----------------------------------------------------------------
    EACH       9    SOLE DISPOSITIVE POWER

  REPORTING

   PERSON      _________________________________________________________________
               10   SHARED DISPOSITIVE POWER         37,773,001*
    WITH


- -------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                                                     37,773,001*

- -------------------------------------------------------------------------------
12   CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES
     (See Instructions)

            [_]

- -------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)    44.9%*




Schedule 13D

- -------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON (See Instructions)

        PN

*See Item 5.



Schedule 13D

CUSIP No. 366651206                  13D                   Page 3 of 10 Pages

- -------------------------------------------------------------------------------
1    NAME OF REPORTING PERSONS. SILVER LAKE INVESTORS, L.P., a Delaware limited
     partnership.
     I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY).  Not
     required.

- -------------------------------------------------------------------------------
2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)
       (a) [X]
       (b) [_]

- -------------------------------------------------------------------------------
3    SEC USE ONLY



- -------------------------------------------------------------------------------
4    SOURCE OF FUNDS (See Instructions)



- -------------------------------------------------------------------------------
5    CHECK 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

  NUMBER OF

   SHARES      _________________________________________________________________
               8    SHARED VOTING POWER              37,773,001*
BENEFICIALLY

  OWNED BY
               -----------------------------------------------------------------
    EACH       9    SOLE DISPOSITIVE POWER

  REPORTING

   PERSON      _________________________________________________________________
               10   SHARED DISPOSITIVE POWER         37,773,001*
    WITH


- -------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                                                     37,773,001*


- -------------------------------------------------------------------------------
12   CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES
     (See Instructions)

            [_]

- -------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)    44.9%*



Schedule 13D

- -------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON (See Instructions)

        PN

*See Item 5.



Schedule 13D

CUSIP No. 366651206                  13D                   Page 4 of 10 Pages

- -------------------------------------------------------------------------------
1    NAME OF REPORTING PERSONS. SILVER LAKE TECHNOLOGY INVESTORS, L.L.C., a
     Delaware limited liability company.
     I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY).  Not
     required.

- -------------------------------------------------------------------------------
2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)
        (a) [X]
        (b) [_]

- -------------------------------------------------------------------------------
3    SEC USE ONLY



- -------------------------------------------------------------------------------
4    SOURCE OF FUNDS (See Instructions)



- -------------------------------------------------------------------------------
5    CHECK 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

  NUMBER OF

   SHARES      _________________________________________________________________
               8    SHARED VOTING POWER              37,773,001*
BENEFICIALLY

  OWNED BY
               -----------------------------------------------------------------
    EACH       9    SOLE DISPOSITIVE POWER

  REPORTING

   PERSON      _________________________________________________________________
               10   SHARED DISPOSITIVE POWER         37,773,001*
    WITH


- -------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                                                     37,773,001*


- -------------------------------------------------------------------------------
12   CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES
     (See Instructions)

            [_]

- -------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)    44.9%*



Schedule 13D

- -------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON (See Instructions)

        OO

*See Item 5.



     This Amendment No. 2 to Schedule 13D supplements and amends the Schedule
13D of Silver Lake Partners, L.P., Silver Lake Investors, L.P., and Silver
Lake Technology Investors, L.L.C. (the "Silver Lake Entities") originally
filed on April 15, 2003, as amended by Amendment No. 1 filed on September 19,
2003, with respect to the Class A Common Stock, par value $.0005 per share
(the "Common Stock") of Gartner, Inc. ("Gartner"). Each item below amends and
supplements the information disclosed under the corresponding item of the
Schedule 13D. Capitalized terms defined in the Schedule 13D are used herein
with their defined meanings.

- -------------------------------------------------------------------------------
Item 4.  Purpose of Transaction.

Item 4 of the Schedule 13D is hereby amended and supplemented by the
following:

     On June 18, 2004, Gartner announced that its Board of Directors approved
a Dutch auction self-tender offer for approximately 11.3 million shares of
Common Stock and approximately 5.5 million shares of its Class B Common Stock,
par value $.0005 per share (the "Class B Common Stock"), at a price per share
not greater than $13.50 nor less than $12.50 (the "Tender Offer").

     The Silver Lake Entities and Gartner entered into a Stock Purchase
Agreement (the "Purchase Agreement") on June 17, 2004, whereby, subject to the
terms and conditions therein, the Silver Lake Entities agreed to sell to
Gartner and Gartner agreed to purchase from the Silver Lake Entities 9,196,065
shares of Common Stock, subject to adjustment as follows (provided that in no
event will more than 12,000,000 shares of Common Stock (the "Share Cap") be
purchased from the Silver Lake Entities): (a) if Gartner increases or
decreases the number of shares of Common Stock subject to the Tender Offer
(any such increase or decrease, the "TO Change"), the aggregate number of
shares of Common Stock to be purchased by Gartner from the Silver Lake
Entities will be increased or decreased, respectively, by an amount equal to
the TO Change multiplied by a fraction, the numerator of which is 46,969,066
and the denominator of which is 57,707,954 (representing the shares of
outstanding shares of Common Stock held of record by the Silver Lake Entities
divided by the outstanding shares of Common Stock held of record by all
stockholders of Gartner other than the Silver Lake Entities) and (b) if the
number of shares of Common Stock tendered and accepted for payment in the
Tender Offer is less than the number of shares of Common Stock Gartner is
offering to purchase in the Tender Offer as of the expiration date (any such
difference, the "Series A Shortfall"), the aggregate number of shares of
Common Stock to be purchased by Gartner from the Silver Lake Entities shall be
increased by an amount equal to the Series A Shortfall. The price per share
paid by Gartner for the shares of Common Stock purchased from the Silver Lake
Entities will be the same as that paid by Gartner to its other stockholders
who tender shares of Common Stock pursuant to the Tender Offer. The Silver
Lake Entities are not obligated to sell any shares if a minimum of 1,680,394
shares are not tendered and accepted for payment in the Tender Offer. The
Silver Lake Entities agreed, pursuant to the terms of the Purchase Agreement,
not to tender any of their shares of Common Stock in the Tender Offer. The
Purchase Agreement is attached as an exhibit to the Schedule 13D and is
incorporated herein by reference.




Schedule 13D

- -------------------------------------------------------------------------------
Item 5.  Interest in Securities of the Issuer.

Item 5 of the Schedule 13D is hereby amended and supplemented by the
following:

     The information contained on the cover pages of this Schedule 13D is
incorporated herein by reference.

     As the date hereof, the Silver Lake Entities beneficially own 46,969,066
shares of Common Stock. Pursuant to the terms of the Purchase Agreement, the
Silver Lake Entities agreed, subject to the terms and conditions therein, to
sell to Gartner and Gartner agreed to purchase from the Silver Lake Entities
9,196,065 shares of Common Stock, subject to adjustment as described above in
Item 4. As a result, assuming the consummation of the transactions
contemplated by the Purchase Agreement, the Silver Lake Entities may be deemed
to be the beneficial owners of approximately 37,773,001 shares of Common
Stock, representing, assuming 11,298,630 shares of Common Stock and 5,505,305
shares of Class B Common Stock are tendered and accepted for payment pursuant
to the Tender Offer, approximately 44.9% of the issued and outstanding shares
of Common Stock and approximately 35.4% of the total issued and outstanding
shares of the Common Stock and the Class B Common Stock of Gartner, on a
combined basis.

- -------------------------------------------------------------------------------
Item 6.  Contracts, Arrangements, Understandings or Relationships with Respect
         to Securities of the Issuer.

     Item 6 of the Schedule 13D is hereby amended and supplemented by the
information contained in Item 4 of this Amendment, which is herein
incorporated by reference.

- -------------------------------------------------------------------------------

Item 7.  Material to be Filed as Exhibits.

     Item 7 of the Schedule 13D is hereby supplemented by adding the
following:

Exhibit 3   Stock Purchase Agreement, dated as of June 17, 2004, by and among
            Silver Lake Partners, L.P., Silver Lake Investors, L.P., Silver Lake
            Technology Investors, L.L.C. and Gartner, Inc.

- -------------------------------------------------------------------------------



Schedule 13D
                                   SIGNATURES


     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.

DATED:  June 21, 2004

                                SILVER LAKE PARTNERS, L.P.

                                By:  Silver Lake Technology Associates,
                                     L.L.C., its general partner


                                By:  /s/ Glenn H. Hutchins
                                     ------------------------------
                                     Name:  Glenn H. Hutchins
                                     Title:  Managing Member


                                SILVER LAKE INVESTORS, L.P.

                                By:  Silver Lake Technology Associates,
                                     L.L.C., its general partner


                                By:  /s/ Glenn H. Hutchins
                                     ------------------------------
                                     Name:  Glenn H. Hutchins
                                     Title:  Managing Member


                                SILVER LAKE TECHNOLOGY INVESTORS, L.L.C.

                                By:  Silver Lake Technology
                                     Management, L.L.C., its manager


                                By:  /s/ Glenn H. Hutchins
                                     ------------------------------
                                     Name:  Glenn H. Hutchins
                                     Title:  Managing Member



                                                                Exhibit 3
                                                                ---------

                                                                EXECUTION COPY
                                                                --------------

                           STOCK PURCHASE AGREEMENT



     This STOCK PURCHASE AGREEMENT (the "Agreement") is made as of June 17,
2004 by and among Gartner, Inc., a corporation organized and existing under
the laws of the State of Delaware (the "Company"), and Silver Lake Partners,
L.P., a Delaware limited partnership, Silver Lake Investors, L.P., a Delaware
limited partnership, and Silver Lake Technology Investors, L.L.C., a Delaware
limited liability company (collectively, "Silver Lake").

                                R E C I T A L S

     A. WHEREAS, the Company intends, but has not made any public announcement
of such intention, to conduct a public modified Dutch auction self-tender
offer for up to 11,298,630 shares of its Common Stock, Class A, par value
$0.0005 per share ("Class A Common Stock"), and 5,505,305 shares of its Common
Stock, Class B, par value $0.0005 per share ("Class B Common Stock," and
together with the Class A Common Stock, the "Common Stock"), at prices ranging
from $12.50 to $13.50 per share pursuant to the terms and conditions set forth
in the draft Offer to Purchase substantially in the form attached hereto as
Annex A, as the same may be revised, amended, modified or supplemented from
time to time after the date hereof in accordance with Section 8 hereof (the
"Tender Offer"), commencing no later than June 22, 2004;

     B. WHEREAS, as of the date hereof, Silver Lake owns of record 46,969,066
shares of Class A Common Stock of the Company, which constitutes approximately
44.9% of the issued and outstanding shares of Class A Common Stock, and
approximately 35.4% of the issued and outstanding shares of Common Stock;

     C. WHEREAS, Silver Lake is entitled to certain contractual consent rights
(in addition to any vote or consent of the board of directors or the
stockholders of the Company required by law or the Company's certificate of
incorporation) pursuant to the terms of that certain Amended and Restated
Securityholders Agreement, dated as of July 12, 2002, among the Company,
Silver Lake Partners, L.P. and certain additional signatories thereto (the
"Securityholders Agreement");

     D. WHEREAS, Silver Lake has determined it will not exercise its right to
tender any of its shares of Class A Common Stock pursuant to the Tender Offer;
and

     E. WHEREAS, the Company and Silver Lake desire to make certain covenants
and agreements with one another pursuant to this Agreement.

     NOW THEREFORE, in consideration of the covenants and promises set forth
herein, and for other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the parties hereby agree as
follows:




                                   AGREEMENT

     1. PURCHASE AND SALE OF THE SHARES; THE CLOSING.

     1.1 PURCHASE AND SALE OF CLASS A COMMON STOCK. Subject to the completion
of the Tender Offer as set forth below and the other terms and conditions of
this Agreement, and on the basis of the representations, warranties and
covenants set forth herein, Silver Lake agrees to sell to the Company, and the
Company agrees to purchase from Silver Lake, 9,196,065 shares of Class A
Common Stock, subject to adjustment as follows; provided, that in no event
shall Silver Lake sell more than 12,000,000 shares of Series A Common Stock
(the "Share Cap") to the Company:

     (a) if the Company increases or decreases the number of shares of Class A
Common Stock subject to the Tender Offer (any such increase or decrease, the
"TO Change"), the aggregate number of shares of Class A Common Stock to be
purchased by the Company from Silver Lake shall be increased or decreased,
respectively, by an amount equal to the TO Change multiplied by a fraction,
the numerator of which is 46,969,066 and the denominator of which is
57,707,954 (representing the outstanding shares of Class A Common Stock held
of record by Silver Lake divided by the outstanding shares of Class A Common
Stock held of record by all stockholders of the Company other than Silver
Lake), subject to the Share Cap; and

     (b) if the number of shares of Class A Common Stock tendered and accepted
for payment in the Tender Offer is less than the number of shares of Class A
Common Stock the Company is offering to purchase in the Tender Offer as of the
expiration date (any such difference, the "Series A Shortfall"), the aggregate
number of shares of Class A Common Stock to be purchased by the Company from
Silver Lake shall be increased by an amount equal to the Series A Shortfall,
subject to the Share Cap.

The number of shares of Class A Common Stock to be purchased from Silver Lake
by the Company pursuant to this Section 1.1 is herein referred to as, the
"Shares". The allocation of the Shares to be sold by each Silver Lake entity
at the Closing shall be pro rata based on the number of shares of Class A
Common Stock held of record by each of Silver Lake Partners, L.P., Silver Lake
Investors, L.P., and Silver Lake Technology Investors, L.L.C., rounded to the
nearest whole share, or in such other proportion as Silver Lake may determine;
provided Silver Lake notifies the Company of such allocation at least one
business day prior to the Closing.

     1.2 PURCHASE PRICE. The "Per Share Purchase Price" for the Shares shall
be equal to the price per share paid by the Company for the shares of Class A
Common Stock tendered by the holders of Class A Common Stock in the Tender
Offer. The "Purchase Price" shall equal the Per Share Purchase Price specified
in Section 1.2 multiplied by the number of Shares purchased by the Company
from Silver Lake pursuant to Section 1.1 of this Agreement.

     1.3 THE CLOSING. Subject to the terms and conditions hereof, the purchase
and sale of the Shares contemplated by this Agreement (the "Closing") will
take place at the offices of Wilson Sonsini Goodrich & Rosati, 12 East 49th
Street, New York, New York 10017 at 10:00 a.m. New York City time on the
eleventh business day following the date that the funds are made available by

                                      2


the Company to the depositary for the settlement of Class A Common Stock
tendered in the Tender Offer (the "Successful Completion"), or at such other
later date or place as the parties shall mutually agree. At the Closing, (i)
Silver Lake will deliver to the Company certificates representing the Shares
to be purchased by the Company duly endorsed or accompanied by stock powers
duly executed in blank and otherwise in form acceptable for transfer on the
books of the Company, and (ii) the Company shall deliver the Purchase Price to
Silver Lake by wire transfer of immediately available funds to one or more
accounts specified by Silver Lake at least one business day prior to the
Closing.

     2. REPRESENTATIONS AND WARRANTIES OF SILVER LAKE. In order to induce the
Company to enter into this Agreement, Silver Lake hereby represents and
warrants to the Company as follows:

     2.1 OWNERSHIP OF SHARES. Silver Lake owns of record the number of issued
and outstanding shares of Class A Common Stock set forth in the recitals to
this Agreement. The Shares to be sold to the Company by Silver Lake when
delivered to the Company shall be free and clear of any liens, claims or
encumbrances, including rights of first refusal and similar claims except for
restrictions of applicable state and federal securities laws. There are no
restrictions on the transfer of such Shares imposed by any shareholder or
similar agreement or any law, regulation or order, other than applicable state
and federal securities laws.

     2.2 AUTHORIZATION. Silver Lake has full right, power and authority to
execute, deliver and perform this Agreement and to sell, assign and deliver
the Shares to be sold by it to the Company. This Agreement is the legal, valid
and, assuming due execution and delivery by the other parties hereto, binding
obligation of Silver Lake, enforceable in accordance with its terms, except to
the extent that the enforceability thereof may be limited by (i) principles of
public policy, (ii) applicable bankruptcy, insolvency, reorganization or other
laws of general application relating to or affecting the enforcement of
creditors' rights generally, and (iii) rules of law governing the availability
of equitable remedies.

     2.3 NO VIOLATION; NO CONSENT. The execution, delivery and performance of
this Agreement and the consummation of the transactions contemplated hereby by
Silver Lake (a) will not constitute a breach or violation of or default under
any judgment, decree or order or any agreement or instrument of Silver Lake or
to which Silver Lake is subject, (b) will not result in the creation or
imposition of any lien upon the Shares to be sold by Silver Lake, and (c) will
not require the consent of or notice to any governmental entity or any party
to any contract, agreement or arrangement with Silver Lake.

     2.4 BROKERAGE. There are no claims for brokerage commissions or finder's
fees or similar compensation in connection with the transactions contemplated
by this Agreement based on any arrangement or agreement made by or on behalf
of Silver Lake.

     3. REPRESENTATIONS AND WARRANTIES OF THE COMPANY. In order to induce
Silver Lake to enter into this Agreement, the Company hereby represents and
warrants as follows:


                                      3


     3.1 ORGANIZATION AND CORPORATE POWER; AUTHORIZATION. The Company is a
corporation duly incorporated, validly existing and in good standing under the
laws of the State of Delaware. The Company has the requisite power and
authority to execute, deliver and perform this Agreement and to acquire the
Shares. As of the Closing the Company will have sufficient capital to purchase
the Shares hereunder and to purchase the shares of Common Stock to be
purchased pursuant to the Tender Offer in each case in compliance with Section
160 of the Delaware General Corporation Law. The execution, delivery and
performance of this Agreement and the consummation by the Company of the
transactions contemplated hereby have been approved by a majority of the
disinterested directors on the Board of Directors of the Company, having been
advised by counsel, and have been otherwise duly authorized by all requisite
action on the part of the Company. This Agreement and any other agreements,
instruments, or documents entered into by the Company pursuant to this
Agreement have been duly executed and delivered by the Company and are the
legal, valid and, assuming due execution by the other parties hereto, binding
obligations of the Company, enforceable against the Company in accordance with
its terms except to the extent that the enforceability thereof may be limited
by (i) principles of public policy, (ii) applicable bankruptcy, insolvency,
reorganization or other laws of general application relating to or affecting
the enforcement of creditors' rights generally, and (iii) rules of law
governing the availability of equitable remedies.

     3.2 CAPITAL STOCK. The authorized capital stock of the Company consists
of (i) 250,000,000 shares of Common Stock, of which 166,000,000 shares are
designated Class A Common Stock, of which 104,677,020 shares are issued and
outstanding, and 84,000,000 shares are designated Class B Common Stock, of
which 28,118,443 shares are issued and outstanding, and (ii) 5,000,000 shares
of preferred stock, par value $0.01 per share, of which 166,000 shares are
designated as Series A Junior Participating Preferred Stock, none of which are
issued and outstanding, and 84,000 are designated as Series B Junior
Participating Preferred Stock, none of which are issued and outstanding.

     3.3 NO VIOLATION; NO CONSENT. The execution, delivery and performance of
this Agreement and the consummation of the transactions contemplated hereby by
the Company (a) will not constitute a breach or violation of or default under
any judgment, decree or order or any agreement or instrument of the Company or
to which the Company is subject, and (b) will not require the consent of or
notice to any governmental entity or any party to any contract, agreement or
arrangement with the Company, other than the consent of Silver Lake provided
in Section 8 hereof.

     3.4 BROKERAGE. There are no claims for brokerage commissions or finder's
fees or similar compensation in connection with the transactions contemplated
by this Agreement based on any arrangement or agreement made by or on behalf
of the Company.

     4. CONDITIONS TO THE COMPANY'S OBLIGATIONS. The obligations of the
Company under Article 1 to purchase the Shares at the Closing from Silver Lake
are subject to the fulfillment as of the Closing of each of the following
conditions unless waived by the Company in accordance with Section 9.3:

                                      4


     4.1 REPRESENTATIONS AND WARRANTIES. The representations and warranties of
Silver Lake contained in Article 2 shall be true and correct on and as of the
date of the Closing with the same effect as though such representations and
warranties had been made on and as of the date of the Closing.

     4.2 PERFORMANCE. Silver Lake shall have performed and complied in all
material respects with all agreements, obligations, and conditions contained
in this Agreement that are required to be performed or complied with by it on
or before the date of the Closing.

     4.3 TENDER OFFER. The Successful Completion of the Tender Offer shall
have occurred.

     4.4 DELIVERY OF CERTIFICATES. Silver Lake shall have delivered all of the
stock certificates representing the Shares to be sold by it at the Closing,
free and clear of any liens, claims or encumbrances, along with all stock
powers, assignments or any other documents, instruments or certificates
necessary for a valid transfer.

     4.5 FURTHER ASSURANCES. No governmental authority shall have advised or
notified the Company that the consummation of the transactions contemplated
hereunder would constitute a material violation of any applicable laws or
regulations, which notification or advice shall not have been withdrawn after
the exhaustion of the Company's good faith efforts to cause such withdrawal.

     5. CONDITIONS TO SILVER LAKE'S OBLIGATIONS. The obligations of Silver
Lake under Article 1 to sell the Shares at the Closing are subject to the
fulfillment as of the Closing of each of the following conditions unless
waived by Silver Lake in accordance with Section 9.3:

     5.1 REPRESENTATIONS AND WARRANTIES. The representations and warranties of
the Company contained in Article 3 shall be true and correct as of the date of
the Closing with the same effect as though such representations and warranties
had been made on and as of the date of the Closing.

     5.2 PERFORMANCE. The Company shall have performed and complied in all
material respects with all agreements, obligations and conditions contained in
this Agreement that are required to be performed or complied with by it on or
before the date of the Closing.

     5.3 PAYMENT OF PURCHASE PRICE. The Company shall have delivered the
Purchase Price to be paid by the Company to Silver Lake by wire transfer to
the account(s) specified by Silver Lake.

     5.4 MINIMUM AMOUNT OF COMMON STOCK TENDERED. The number of shares of
Common Stock tendered and accepted for payment in the Tender Offer shall not
be less 1,680,394 shares.

                                      5


     6. COVENANTS.

     6.1 NO PURCHASE OF COMMON STOCK. Until eleven business days following the
Successful Completion of the Tender Offer, Silver Lake agrees that it will
not, directly or indirectly, purchase any shares of Common Stock. Other than
the consents provided pursuant to the terms of this Agreement, all prior
consents granted by Silver Lake under the Securityholders Agreement with
respect to repurchases of shares of capital stock are of no further force or
effect with respect to future purchases of capital stock.

     6.2 NO SALE OF CLASS A COMMON STOCK. Except as contemplated hereunder,
from the date hereof until the Closing or the termination of this Agreement,
Silver Lake agrees that it will not, directly or indirectly, sell any shares
of Class A Common Stock, including in the Tender Offer.

     6.3 CLOSING CONDITIONS. Silver Lake and the Company shall use their
commercially reasonable efforts to ensure that each of the conditions to
Closing is satisfied.

     7. SURVIVAL OF REPRESENTATIONS AND WARRANTIES; LIMITATION ON LIABILITY.
All representations and warranties hereunder shall survive the Closing.
Notwithstanding the foregoing, in no event shall Silver Lake's liability for
breach of the representations, warranties and covenants exceed the Purchase
Price to be paid by the Company to Silver Lake.

     8. SILVER LAKE CONSENT. For purposes of Section 2.3 of the
Securityholders Agreement and for all other purposes, Silver Lake hereby
provides its consent with respect to (i) the transactions contemplated by this
Agreement, (ii) the Tender Offer, (iii) the incurrence by the Company of
additional indebtedness from time to time, of up to $325,000,000, $225,000,000
of which shall be utilized to provide the necessary or desirable financing for
the Tender Offer, and (iv) all other transactions and actions as the officers
of the Company reasonably deem necessary or advisable to effectuate the Tender
Offer. For the avoidance of doubt, Silver Lake's consent shall be required for
any amendment to the terms of the Tender Offer that (i) changes the type or
amount of consideration per share offered to security holders, (ii) increases
the aggregate number of shares of Common Stock sought in the Tender Offer in
excess of 16,803,935 (plus up to an additional 2% of the outstanding shares of
each class of Common Stock), (iii) decreases the aggregate number of shares of
Class A Common Stock sought in the Tender Offer below 11,298,630 (provided,
however, that this shall in no way limit the Company's ability to accept a
smaller number of shares for payment if the Tender Offer for the Class A
Common Stock is undersubscribed), (iv) materially alters any of the conditions
of the Tender Offer contained in Section 7 of the Offer to Purchase, adds any
additional conditions to the Tender Offer (provided, however, that this shall
in no way limit the Company's ability to waive any such condition), or changes
the minimum number of shares required to be tendered into the Tender Offer to
something other than 1,680,394 shares of Common Stock), or (v) extends the
expiration date of the Tender Offer beyond September 15, 2004.

     9. MISCELLANEOUS.

     9.1 ADJUSTMENTS. Wherever a particular number is specified herein,
including, without limitation, number of shares or price per share, such
number shall be adjusted to reflect any stock dividends, stock-splits, reverse
stock-splits, combinations or other reclassifications of stock or any similar
transactions and appropriate adjustments shall be made with respect to the
relevant

                                      6


provisions of this Agreement so as to fairly and equitably preserve,
as far as practicable, the original rights and obligations of the Company and
Silver Lake under this Agreement.

     9.2 GOVERNING LAW; JURISDICTION. This Agreement shall be governed by and
construed and enforced in accordance with the internal laws of the State of
Delaware without giving effect to the principles of conflicts of laws. Any
legal action or other legal proceeding relating to this Agreement or the
enforcement of any provision of this Agreement may be brought or otherwise
commenced in any state or federal court located in the State of Delaware. Each
party hereto agrees to the entry of an order to enforce any resolution,
settlement, order or award made pursuant to this Section 9.1 by the state and
federal courts located in the State of Delaware and in connection therewith
hereby waives, and agrees not to assert by way of motion, as a defense, or
otherwise, any claim that such resolution, settlement, order or award is
inconsistent with or violative of the laws or public policy of the laws of the
State of Delaware or any other jurisdiction.

     9.3 SUCCESSORS AND ASSIGNS. Except as otherwise expressly provided
herein, the provisions hereof shall inure to the benefit of, and be binding
upon, the successor and assigns of the parties hereto.

     9.4 ENTIRE AGREEMENT; AMENDMENT. This Agreement constitutes the full and
entire understanding and agreement between the parties with regard to the
subjects hereof and thereof. Neither this Agreement nor any provision hereof
may be amended, changed or waived other than by a written instrument signed by
the party against who enforcement of any such amendment, change or waiver is
sought. For the avoidance of doubt, to the extent that any of the terms and
conditions of this Agreement are inconsistent with any of the terms and
conditions contained in the draft Offer to Purchase attached hereto as Annex
A, the terms of this Agreement will govern and the Offer to Purchase will be
revised to be consistent with the terms of this Agreement.

     9.5 COOPERATION. The Company and Silver Lake shall, from and after the
date hereof, cooperate in a reasonable manner to effect the purposes of this
Agreement.

     9.6 TERMINATION. The Company or Silver Lake may terminate this Agreement
if (i) the Tender Offer is terminated without the purchase of any shares of
Common Stock or (ii) if the Tender Offer is not consummated by September 15,
2004; provided that the Company may not terminate this Agreement under this
clause (ii) unless the Tender Offer is terminated. Upon termination of this
Agreement pursuant to Section 9.5, none of the parties hereto shall have any
liability hereunder except for breaches of such party's representations,
warranties or covenants occurring prior to the date of such termination.

     9.7 NOTICES, ETC. All notices and other communications required or
permitted hereunder shall be effective upon receipt and shall be in writing
and may be delivered in person, by telecopy, electronic mail, express delivery
service or U.S. mail, in which event it may be mailed by first-class,
certified or registered, postage prepaid, addressed, to the party to be
notified, at the respective addresses set forth below, or at such other
address which may hereinafter be designated in writing:

                                      7


     (a) If to Silver Lake, to:

         Silver Lake Partners, L.P.
         320 Park Avenue, 33rd Floor
         New York, NY  10022
         Attention: Mike Bingle
         Phone:  212-981-5600
         Fax:    212-981-3535

         with a copy to:

         Simpson Thacher & Bartlett LLP
         425 Lexington Avenue
         New York, NY 10017
         Attention:  Mario Ponce, Esq.
         Fax:    212-455-2502

     (b) If to the Company, to:

         Gartner, Inc.
         P.O. Box 10212
         56 Top Gallant Road
         Stamford, CT 06902-7747
         Attention: General Counsel
         Phone:  203-316-6311
         Fax:    203-316-6245

         with a copy to:

         Wilson Sonsini Goodrich & Rosati
         12 East 49th Street
         New York, NY 10017
         Attention:  Robert D. Sanchez, Esq.
         Fax No.  212-999-5899

     9.8 SEVERABILITY. If any provision of this Agreement shall be judicially
determined to be invalid, illegal or unenforceable, the validity, legality and
enforceability of the remaining provisions shall not in any way be affected or
impaired thereby.

     9.9 TITLES AND SUBTITLES. The titles of the Articles and Sections of this
Agreement are for convenience of reference only and in no way define, limit,
extend, or describe the scope of this Agreement or the intent of any of its
provisions.

                                      8


     9.10 COUNTERPARTS. This Agreement may be executed in any number of
counterparts, each of which shall be an original, but all of which together
shall constitute one instrument.

     9.11 DELAYS OR OMISSIONS. It is agreed that no delay or omission to
exercise any right, power or remedy accruing to any party upon any breach or
default of any other party under this Agreement shall impair any such right,
power or remedy, nor shall it be construed to be a waiver of any such breach
or default, or any acquiescence therein, or of any similar breach or default
thereafter occurring; nor shall any waiver of any single breach or default be
deemed a waiver of any other breach or default theretofore or thereafter
occurring. It is further agreed that any waiver, permit, consent or approval
of any kind or character of any breach or default under this Agreement, or any
waiver of any provisions or conditions of this Agreement must be in writing
and shall be effective only to the extent specifically set forth in writing,
and that all remedies, either under this Agreement, by law or otherwise, shall
be cumulative and not alternative.

     9.12 CONSENTS. Any permission, consent, or approval of any kind or
character under this Agreement shall be in writing and shall be effective only
to the extent specifically set forth in such writing.

     9.13 SPECIFIC PERFORMANCE. THE PARTIES HERETO AGREE THAT IRREPARABLE
DAMAGE WOULD OCCUR IN THE EVENT THAT ANY OF THE PROVISIONS OF THIS AGREEMENT
WERE NOT PERFORMED IN ACCORDANCE WITH ITS SPECIFIC INTENT OR WERE OTHERWISE
BREACHED. IT IS ACCORDINGLY AGREED THAT THE PARTIES SHALL BE ENTITLED TO AN
INJUNCTION OR INJUNCTIONS, WITHOUT BOND, TO PREVENT OR CURE BREACHES OF THE
PROVISIONS OF THIS AGREEMENT AND TO ENFORCE SPECIFICALLY THE TERMS AND
PROVISIONS HEREOF, THIS BEING IN ADDITION TO ANY OTHER REMEDY TO WHICH THEY
MAY BE ENTITLED BY LAW OR EQUITY, AND ANY PARTY SUED FOR BREACH OF THIS
AGREEMENT EXPRESSLY WAIVES ANY DEFENSE THAT A REMEDY IN DAMAGES WOULD BE
ADEQUATE.

     9.14 PAYMENT OF FEES AND EXPENSES. Each party shall be responsible for
paying its own fees, costs and expenses in connection with this Agreement and
the transactions herein contemplated.

     9.15 CONSTRUCTION OF AGREEMENT. No provision of this Agreement shall be
construed against either party as the drafter thereof.

     9.16 SECTION REFERENCES. Unless otherwise stated, any reference contained
herein to a Section or subsection refers to the provisions of this Agreement.

     9.17 VARIATIONS OF PRONOUNS. All pronouns and all variations thereof
shall be deemed to refer to the masculine, feminine, or neuter, singular or
plural, as the context in which they are used may require.

                                      9


     IN WITNESS WHEREOF, the parties have caused this Stock Purchase Agreement
to be duly executed and delivered by their proper and duly authorized officers
as of the day and year first written above.

                                 GARTNER, INC.



                                 By: /s/ Christopher Lafond
                                    ---------------------------------------
                                    Name: Christopher Lafond
                                    Title:  Executive Vice President and
                                              Chief Financial Officer


                                 SILVER LAKE

                                 SILVER LAKE PARTNERS, L.P.

                                 By:  Silver Lake Technology
                                        Associates, L.L.C.,
                                        its General Partner


                                 By: /s/ Michael Bingle
                                    ----------------------------------------
                                    Name:   Michael Bingle
                                    Title:  Managing Director


                                 SILVER LAKE INVESTORS, L.P.

                                 By:  Silver Lake Technology
                                        Associates, L.L.C.,
                                        its General Partner


                                 By: /s/ Michael Bingle
                                    ----------------------------------------
                                    Name:   Michael Bingle
                                    Title:  Managing Director


                                 SILVER LAKE TECHNOLOGY INVESTORS, L.L.C.


                                 By: /s/ Michael Bingle
                                    ----------------------------------------
                                    Name:   Michael Bingle
                                    Title:  Managing Director