GARTNER GROUP INC
S-3, 1999-04-21
MANAGEMENT SERVICES
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<PAGE>   1
     As filed with the Securities and Exchange Commission on April 21, 1999
                                                Registration No. 333-___________

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                    FORM S-3
                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933

                               GARTNER GROUP, INC.
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)

                  DELAWARE                             04-3099750
      (STATE OR OTHER JURISDICTION OF              (I.R.S. EMPLOYER
       INCORPORATION OR ORGANIZATION)            IDENTIFICATION NUMBER)

                                 P.O. BOX 10212
                               56 TOP GALLANT ROAD
                             STAMFORD, CT 06904-2212
                                 (203) 316-1111

(ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE,
OF REGISTRANT'S PRINCIPAL EXECUTIVE OFFICES)

                               WILLIAM T. CLIFFORD
                             CHIEF EXECUTIVE OFFICER
                               GARTNER GROUP, INC.
                                 P.O. BOX 10212
                               56 TOP GALLANT ROAD
                             STAMFORD, CT 06904-2212
                                 (203) 316-1111

(NAME, ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE, 
OF AGENT FOR SERVICE)

                                   Copies to:
                             HOWARD S. ZEPRUN, ESQ.
                        WILSON SONSINI GOODRICH & ROSATI
                            PROFESSIONAL CORPORATION
                               650 PAGE MILL ROAD
                            PALO ALTO, CA 94304-1050

     APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC:
 As soon as practicable after this Registration Statement becomes effective.

/ /  If the only securities being registered on this Form are offered pursuant
to dividend or interest reinvestment plans, check the following box.

     If any of the securities being registered on this Form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, other than securities offered only in connection with dividend or interest
reinvestment plans, check the following box. /X/

     If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering.

/ /  If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering.

/ /  If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box.

<TABLE>
<CAPTION>
                         CALCULATION OF REGISTRATION FEE
- ----------------------------------------------------------------------------------------------------------------------------------
                                                                            PROPOSED                PROPOSED         
            TITLE OF EACH CLASS                      AMOUNT                 MAXIMUM                 MAXIMUM             AMOUNT OF
              OF SECURITIES TO                        TO BE              OFFERING PRICE            AGGREGATE          REGISTRATION
               BE REGISTERED                       REGISTERED           PER SECURITY (1)         OFFERING PRICE            FEE
- ----------------------------------------------------------------------------------------------------------------------------------
<S>                                                <C>                  <C>                      <C>                  <C>
Common Stock, $0.0005 par value                      542,278                 $20.31                $11,015,022           $3,062
- ----------------------------------------------------------------------------------------------------------------------------------
</TABLE>

(1)   The price of $20.31 per share, which was the average of the high and low
      prices of the Registrant's Common Stock on the New York Stock Exchange on
      April 16, 1999, is set forth solely for the purposes of calculating the
      registration fee in accordance with Rule 457(c) of the Securities Act of
      1933, as amended. 

      The registrant hereby amends this registration statement on such date or
dates as may be necessary to delay its effective date until the registrant shall
file a further amendment which specifically states that this registration
statement shall thereafter become effective in accordance with Section 8(a) of
the Securities Act of 1933, as amended, or until this registration statement
shall become effective on such date as the Commission, acting pursuant to said
Section 8(a), may determine.
<PAGE>   2
The Information in this prospects is not complete and may be changed. We may not
sell these securities until the registration statement filed with the Securities
Exchange Commission is effective. This prospectus is not an offer to sell these
securities and is not soliciting an offer to buy these securities in any state
where the offer or sale is not permitted.

                                   PROSPECTUS

                                 542,278 SHARES

                               GARTNER GROUP, INC.

                                  Common Stock

This prospectus relates to the public offering, which is not being underwritten,
of up to 542,278 shares of our Common Stock which is held by some of our current
stockholders. The selling stockholders identified in this prospectus acquired
shares of our Common Stock in private transactions in which Gartner Group
acquired G2R, Inc., a California corporation, and The Research Board, Inc., a
New York corporation.

The prices at which such stockholders may sell the shares will be determined by
the prevailing market price for the shares or in negotiated transactions. We
will not receive any of the proceeds from the sale of the shares.

Our Common Stock is listed on the New York Stock Exchange under the symbol "IT."
On April 16, 1999, the average of the high and low price for our Common Stock
was $20.31 per share.

INVESTING IN THE COMMON STOCK INVOLVES CERTAIN RISKS. SEE "RISK FACTORS"
BEGINNING ON PAGE 5.


THE SECURITIES AND EXCHANGE COMMISSION AND STATE SECURITIES REGULATORS HAVE NOT
APPROVED OR DISAPPROVED OF THESE SECURITIES OR DETERMINED IF THIS PROSPECTUS IS
TRUTHFUL OR COMPLETE. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

                 The date of this Prospectus is April 21, 1999.


                                      -1-
<PAGE>   3
                                TABLE OF CONTENTS

                                                                      Page
                                                                      ----
Where You Can Find More Information.....................................3
About Gartner Group, Inc................................................4
Forward-Looking Statements..............................................4
Risk Factors............................................................5
Use of Proceeds   .....................................................11
Selling Stockholders...................................................11
Plan of Distribution...................................................12
Indemnification of Officers and Directors..............................13
Legal Matters..........................................................13
Experts  ..............................................................14

You should rely only on the information contained in this prospectus. We have
not authorized anyone to provide you with information different from that
contained in this prospectus. We are offering to sell, and seeking offers to
buy, shares of Gartner Group, Inc. Common Stock only in jurisdictions where
offers and sales are permitted. The information contained in this prospectus is
accurate only as of the date of this prospectus, regardless of the time of
delivery of this prospectus or of any sale of Gartner Group, Inc. Common Stock.
In this prospectus, the "Company," "Gartner Group," "we," "us," and "our" refer
to Gartner Group, Inc.


                                      -2-
<PAGE>   4
                       WHERE YOU CAN FIND MORE INFORMATION

We file annual, quarterly and special reports, proxy statements and other
information with the SEC. You may read and copy any document we file at the
SEC's public reference rooms in Washington, D.C., New York, New York and
Chicago, Illinois. Please call the SEC at 1-800-SEC-0330 for further information
on the public reference rooms. Our SEC filings are also available to the public
from the SEC's web site at http://www.sec.gov.

The SEC allows us to "incorporate by reference" the information we file with
them, which means that we can disclose important information to you in this
document by referring you to other filings we have made with the SEC. The
information incorporated by reference is considered to be part of this
Prospectus, and later information filed with the SEC will update and supersede
this information. We incorporate by reference the documents listed below and any
future filings made with the SEC under Section 13(a), 13(c), 14 or 15(d) of the
Securities Exchange Act of 1934 until our offering is completed:

         (1)      Our Annual Report on Form 10-K for the year ended September
30, 1998;

         (2)      Our Quarterly Report on Form 10-Q for the quarter ended
December 31, 1998; and

         (3)      The description of our Common Stock contained in our
Registration Statement on Form S-1 filed with the SEC on August 18, 1993,
including any amendments or reports filed for the purpose of updating such
description.

You may request a copy of these filings, at no cost, by writing or telephoning
us at the following address:

                         Michael Fleisher
                         Chief Financial Officer
                         Gartner Group, Inc.
                         P.O. Box 10212
                         56 Top Gallant Road
                         Stamford, CT 06904-2212
                         (203) 316-1111

You should rely only on the information incorporated by reference or provided in
this Prospectus or the prospectus supplement. We have authorized no one to
provide you with different information. We are not making an offer of these
securities in any state where the offer is not permitted. You should not assume
that the information in this Prospectus or any prospectus supplement is accurate
as of any date other than the date on the front of the document.


                                      -3-
<PAGE>   5
                            ABOUT GARTNER GROUP, INC.

Gartner Group, Inc., founded in 1979, is the world's leading independent
provider of research and analysis on the computer hardware, software,
communications and related information technology (IT) industries.
Gartner Group's products and services provide strategic and tactical advice for
organizations trying to understand, apply and deploy information technology on a
global basis. Our integrated products and services help enterprises stay abreast
of rapidly changing IT trends - a critical ingredient when making multi-million
dollar IT purchasing, marketing or investment decisions. Our products and
services are organized along client segments: IT users - enterprises that
purchase and deploy IT products and services to gain productivity or competitive
advantage, and IT vendors - companies that develop and provide IT products.

Approximately 75 percent of our total revenues are annual renewable
subscription-based products, where contracts are paid up-front and revenue is
recognized ratably over the life of the contract. Total revenues have grown
every year since our inception in 1979. In fiscal 1998, revenue was $642
million, a 30 percent compounded annual growth rate since 1993. Through a field
sales force of over 750 professionals and a global analytical staff of over 800
industry experts, we sell products and services to over 9,000 organizations
worldwide. We employ over 3,200 associates and have locations in 50 countries in
North and South America, Europe, Asia, Australia and Africa.


                           FORWARD-LOOKING STATEMENTS

This Prospectus and the documents incorporated herein by reference contain
forward-looking statements within the meaning of Section 27A of the Securities
Act and Section 21E of the Exchange Act. Words such as "anticipates," "expects,"
"intends," "plans," "believes," "seeks," "estimates," variations of such words
and similar expressions are intended to identify such forward-looking
statements. These statements are not guarantees of future performance and are
subject to certain risks, uncertainties and assumptions that are difficult to
predict. Therefore, actual results could differ materially from those expressed
or forecasted in any such forward-looking statements as a result of certain
factors, including those set forth in "Risk Factors," as well as those noted in
the documents incorporated herein by reference. In connection with
forward-looking statements which appear in these disclosures, investors should
carefully review the factors set forth in this Prospectus under "Risk Factors."


                                      -4-
<PAGE>   6
                                  RISK FACTORS

You should carefully consider the risks described below before making an
investment decision. The risks and uncertainties described below are not the
only ones that we face. Additional risks and uncertainties not presently known
to us or that we currently deem immaterial may also impair our business
operations.

If any of the following risks actually occur, our business, financial condition
or results of operations could be materially adversely affected. In such case,
the trading price of our common stock could decline and you could lose all or
part of your investment.

This prospectus also contains forward-looking statements that involve risks and
uncertainties. Our actual results could differ materially from those anticipated
in these forward-looking statements as a result of certain factors, including
the risks faced by us described below and elsewhere in this prospectus.

OUR FUTURE OPERATING RESULTS DEPEND ON A VARIETY OF RISKS, MANY OF WHICH ARE NOT
IN OUR CONTROL

Our future operating results depend upon our ability to continue to compete
successfully in the market for information products and services. We may not be
able to continue to provide the products and services that meet client needs as
the Information Technology ("IT") market evolves rapidly.

Our future operating results, and our ability to compete successfully in the IT
market, will depend on:

         -        our ability to hire and retain a premier staff of qualified IT
                  analysts in a competitive employment market, and our ability
                  to expand our staff to support evolving customer needs and
                  growth of our business;

         -        our ability to expand our product and service offerings to
                  smaller domestic clients;

         -        our ability to devote the additional management attention and
                  financial resources necessary to further expand our business;
                  and

         -        the risks inherent in international sales, including:

                  -        changes in market demand as a result of exchange rate
                           fluctuations;

                  -        challenges in staffing and managing our foreign sales
                           operations; and

                  -        higher levels of taxation on foreign income than
                           domestic income.

OUR REVENUES DEPEND ON RENEWALS OF EXISTING CONTRACTS AND OUR ABILITY TO
GENERATE NEW BUSINESS

We measure the volume of our advisory and measurement business based on contract
value. We calculate total contract value based on the annualized value of all
advisory and measurement contracts in effect at the time of the calculation,
without regard to the duration of those contracts. While we believe contract
value is a meaningful measure of our business level, contract value at any time
may not be indicative of future advisory and measurement revenues or cash flows.
In this regard, a substantial portion of our clients have historically renewed
our services for an equal or higher level of total payments each year, and,
historically, annual revenues from these services in any fiscal year have
closely correlated to contract value at the 


                                      -5-
<PAGE>   7
beginning of the fiscal year. As of September 30, 1998, approximately 85 percent
of our clients had renewed one or more services in the last twelve months.
Nonetheless, this renewal rate is not necessarily indicative of the rate of
retention of our revenue base. Revenues and cash flows in any year depend
significantly on the rate of contract renewal through the year as well as new
business generation. While we have experienced high contract renewal rates in
recent years, we may not be able to sustain high renewal rates in the future.
Any deterioration in our ability to achieve high renewal rates or to continue to
generate significant new business would impact future growth in our business.
Moreover, a significant portion of our new business in any given year has
historically been generated in the last portion of the fiscal year. Accordingly,
any slowdowns in year to year revenue generation might not be apparent until
late in a given fiscal year.

Deferred revenues, as presented in our balance sheets, represent unamortized
revenues from billed advisory and measurement services and products, plus
unamortized revenues of certain other billed services and products not included
in advisory and measurement. Contract value represents an annualized value of
all outstanding advisory and measurement contracts without regard to the
duration of such contracts, while deferred revenues represents unamortized
revenue remaining on all billed and outstanding advisory and measurement
contracts, plus certain other billed services and products not included in
advisory and measurement revenue. Accordingly deferred revenues do not correlate
to contract value as of any one date.


WE MAY NOT BE ABLE TO CONTINUE TO COMPETE SUCCESSFULLY IN THE COMPETITIVE MARKET
FOR IT PRODUCTS AND SERVICES

We believe that the principal competitive factors in our industry are:

                  -        quality of research and analysis;

                  -        timely delivery of information;

                  -        customer service;

                  -        the ability to offer products that meet changing
                           market needs for information and analysis; and

                  -        price.

We believe that we compete favorably with respect to each of these factors.
However, we face competition from many companies, and we believe that
competition is increasing.

We face competition from other independent providers of similar services, as
well as our clients' internal marketing and planning departments. We also
compete indirectly against other information providers, including electronic and
print media companies and consulting firms. These indirect competitors could
choose to compete directly against us in the future. In addition, although we
have established a significant market presence, there are limited barriers to
entry into our market. New competitors continue to emerge, and additional
competitors could readily emerge in one or more of the market segments we
address. Additional competition also continues to emerge as the IT industries
change and new customer needs evolve. Increased competition could adversely
affect our operating results through downward pricing pressure and loss of
market share.


                                      -6-
<PAGE>   8
WE DEPEND ON OUR KEY EMPLOYEES AND ON OUR ABILITY TO HIRE ADDITIONAL QUALIFIED
PERSONNEL

Our future success will depend heavily upon the continued contributions of our
senior management team, professional analysts, and experienced sales personnel.
Accordingly, future operating results will be largely dependent upon our ability
to retain our key employees and to attract additional qualified personnel. We
experience intense competition for professional personnel from, among others,
other providers of IT research and analysis services, producers of IT products,
management consulting firms and financial services companies. Many of these
firms have substantially greater financial resources than we do to attract and
compensate qualified personnel. The loss of the services of key management and
professional personnel could have a material adverse effect on our business.

WE FACE YEAR 2000 RISKS WHICH COULD NEGATIVELY IMPACT OUR BUSINESS

The Year 2000 problem results from the fact that many technology systems have
been designed using only a two-digit representation of the year portion of the
date. This has the potential to cause errors or failures in those systems that
depend on correct interpretation of the year, but cannot necessarily correctly
interpret "00" as the year "2000". While the potential ramifications of the Year
2000 issue are significant, we believe that we are taking full advantage of our
internal resources and all necessary external resources to understand, identify
and correct all Year 2000 issues within our control.

We recognize that there are significant unknowns, and therefore potential risks,
that are outside of our control and we will take all reasonable steps to
minimize the impact of those exposures.

We expect to have made all essential systems Year 2000 ready before their known
failure dates or January 1, 2000, whichever is sooner. All of our products are,
or are expected to be, Year 2000 ready before their known failure dates or by
January 1, 2000, whichever is sooner, and should any date-related problems be
revealed after that point, they will be fixed at no charge to the customer or
replaced with a product of equal value. We have established a global inquiry
response process to ensure timely, accurate and documented responses to all
requests for information about our products and services.

We further expect to take all prudent and reasonable steps to validate the Year
2000-readiness of our direct supply chain interfaces, but we believe that this
area does and will continue to represent a significant level of uncertainty and
business risk at least through the first half of the year 2000.

We have established a separate Year 2000 account to budget and track significant
fiscal 1999 Year 2000 expenditures. All maintenance and modification costs are
expended as incurred, while the cost of new systems is being capitalized
according to generally accepted accounting principles. Identified Year 2000
expenses were $1.9 million in fiscal 1998, $0.6 for the three months ended
December 31, 1998, and are forecast to be $4.6 million for the remaining nine
months of fiscal 1999. These costs are predominantly for the budgeted
replacement or upgrades of systems, but also include prorated personnel standard
unit costs.

WE HAVE UNDERTAKEN TO CREATE A NEW CLASS B COMMON STOCK WHICH WILL CONTROL OUR
BOARD OF DIRECTORS IS IN PROCESS

Our Board of Directors has approved a recapitalization and certain related
transactions which could have a significant impact on control of our company.
These transactions are being undertaken in connection with an agreement in
principle between us and IMS Health Incorporated. IMS currently holds 45.8% of
our outstanding shares of Class A common stock. The agreement with IMS is not
yet completed, and the 


                                      -7-
<PAGE>   9
proposed transactions must be approved by our stockholders. If the
recapitalization and related transactions are approved, shares of our Class A
common stock held by IMS will be exchanged for shares of a newly created Class B
common stock. Upon receipt of the newly issued shares of Class B common stock,
IMS will distribute all of the shares of Class B common stock, on a pro rata
basis, to its public stockholders. The Class B common stock will be identical in
all respects to our Class A common stock, except that the Class B common stock
will be entitled to elect 80% of the members of our Board of Directors.
Therefore, following the recapitalization and the distribution of the Class B
shares, holders of a majority of the Class B common stock will be able to elect
80% of our Board of Directors. Thus, if any person or group of persons acquires
a majority of the outstanding shares of Class B common stock, that person or
group will be able to obtain control of our company through the election of
directors.

The creation and issuance of the Class B common stock would render our company
more susceptible to unsolicited takeover bids from third parties. Our Board of
Directors has approved and proposed an amendment to our certificate of
incorporation to provide for a classified board of directors in the event the
recapitalization occurs. If our stockholders approve this proposal, our Board
will be divided into three classes with one class of directors to be elected
each year. If our stockholders approve the amendment to create a classified
Board of Directors, a potential acquiror could only elect a majority of the
Board of Directors over the course of two annual elections of directors.
Accordingly, the creation of a classified Board of Directors would mitigate in
part the increased risk of unsolicited takeover bids that will result from the
creation and issuance of the Class B common stock.

Upon completion of the recapitalization, and following the distribution of our
Class B common stock to the existing public stockholders of IMS, the existing
greater than five percent stockholders of IMS (and their affiliates) will own
approximately [18.6%] of the outstanding Class B common stock. In the event that
such persons, acting together, are able to obtain the votes of an additional
[31.5%] of the outstanding Class B common stock, such persons will have the
ability to control the election of 80% of our Board of Directors and thereby
control the management and affairs of our company. Accordingly, such
concentration of ownership may have the effect of delaying, deferring or
preventing a change in control of our company, impede a merger, consolidation,
takeover or other business combination involving our company or discourage a
potential acquiror from making a tender offer or otherwise attempting to obtain
control of our company.

THE REDUCTION IN CASH AND INCURRENCE OF BORROWINGS ASSOCIATED WITH THE PROPOSED
RECAPITALIZATION AND RELATED TRANSACTIONS COULD LIMIT FUTURE OPERATIONAL
FLEXIBILITY

If our stockholders approve the recapitalization and related transactions that
our Board of Directors has approved, we will expend a significant portion of our
cash and incur significant indebtedness. This will result in significant
interest costs and debt repayment obligations, and will limit the availability
of additional borrowings for other corporate purposes such as cash acquisitions
or significant investments in new areas of business.

If the stockholders approve the proposed recapitalization and related
transactions, we will declare and pay a $300 million cash dividend to our
stockholders. In addition, we will commence a stock repurchase program through
which we will acquire our own common stock on the open market. We will
repurchase the lesser of:

- -        an amount of our common stock valued at $300 million or

- -        a number of our shares equal to 20% of the total number of shares of
         our common stock outstanding.


                                      -8-
<PAGE>   10
In order to pay the cash dividend to our stockholders and finance the stock
repurchase program, we will use available cash and we will incur up to
approximately $450 million of debt financing. These transactions will limit the
amount of cash or borrowings available to us in the future, which could
adversely affect our future operations in various ways, including the following:

- -        we could become increasingly vulnerable to general adverse economic and
         industry conditions;

- -        we will be required to dedicate a substantial portion of our cash flow
         from operations to the payment of principal of, and interest on, our
         indebtedness, which will reduce the availability of cash flow to fund
         activities that might otherwise benefit us; these include cash
         acquisitions, additional investments in new business areas, capital
         expenditures, working capital needs, and other general corporate
         requirements;

- -        we will have reduced ability to obtain additional financing to fund
         such potentially beneficial future activities; and

- -        we may be placed at a competitive disadvantage as compared to less
         leveraged or better capitalized competitors, because of reduced ability
         to invest in our business.

WE WILL INCUR DEBT SERVICE OBLIGATIONS IN CONNECTION WITH THE RECAPITALIZATION
AND RELATED TRANSACTIONS THAT WE MAY NOT BE ABLE TO MEET

Our ability to make principal and interest payments on our outstanding debt will
depend on our future operating performance. Our future operating performance
itself depends on a number of factors, many of which are outside of our control.
These factors include prevailing economic conditions and financial, and
competitive and other factors affecting our business and operations. Although we
believe, based on current levels of operations, that our cash flow from
operations, together with other sources of liquidity, will be adequate to make
required payments of principal and interest on our debt, whether at or prior to
maturity, finance anticipated capital expenditures and fund working capital
requirements, we cannot assure you that our sources of cash will indeed be
sufficient for such purposes. If we are unable to generate sufficient cash flow
from operations, or if we require additional equipment loans or equipment and
working capital lines of credit in the future to service our debt, we may be
required to sell our assets, reduce our capital expenditures, refinance all or a
portion of our existing indebtedness or obtain other sources of financing. We
cannot assure you we would have access to sources of refinancing on commercially
reasonable terms, or at all.

WE WILL ASSUME POTENTIALLY LARGE TAX LIABILITIES UNDER THE DISTRIBUTION
AGREEMENT WITH IMS

In connection with the recapitalization and related transactions with IMS, we
will enter into agreements with IMS governing the transactions. A critical
component of the transactions is the agreement by IMS to distribute to its
public stockholders, on a pro rata basis, the Class B common stock that IMS
receives from us in our recapitalization described above. The distribution, the
recapitalization and the related transactions will be contingent on receipt by
IMS of a favorable ruling from the Internal Revenue Service that the
distribution will be tax-free to IMS and its stockholders. However, even if IMS
receives a favorable IRS ruling, it is possible that under certain circumstances
actions by us (e.g. substantial acquisitions using our stock) following the
distribution could cause the distribution of shares of Class B common stock to
the public 


                                      -9-
<PAGE>   11
stockholders of IMS to become taxable to IMS. Under the terms of the
distribution agreement as currently proposed by IMS, we are required to
indemnify IMS for additional taxes, if any, attributable to such actions.
These potential obligations could substantially limit our ability to engage in
acquisitions or certain other transactions during the two-year period following
the recapitalization and the related transactions. These potential tax
liabilities may also make our company less attractive to a potential acquiror.

STOCK SALES FOLLOWING THE DISTRIBUTION MAY LOWER OUR STOCK PRICE

IMS currently holds 43.4% of the outstanding shares of Class A common stock of
our company. Following the recapitalization, the exchange of Class A common
stock held by IMS for Class B common stock and the distribution of the Class B
common stock to IMS Health stockholders, IMS will hold 6.7% of the common stock
outstanding. IMS stockholders will receive shares of our Class B common stock in
the proposed distribution from IMS. These stockholders may sell into the public
market all or a substantial portion of our shares that they receive in the
distribution by IMS. Sales of substantial amounts of our stock by IMS
stockholders could substantially increase the trading volume of our common stock
and could result in downward pressure on our stock price. Certain large
stockholders may be required to sell a significant amount of our shares if,
after the IMS distribution, by virtue of their holdings in our company plus
their holdings in IMS, they hold a larger amount of our stock than they are
permitted under their internal investment guidelines.

THE CREATION OF A CLASSIFIED BOARD OF DIRECTORS MAY DELAY OR PREVENT A CHANGE OF
CONTROL

If our stockholders approve the proposal to create a classified Board of
Directors, our Board will be divided into three classes with one class of
directors to be elected each year. A potential acquiror could only elect a
majority of the Board of Directors over the course of two annual elections of
directors, which could make our company less attractive to potential acquirors
and could therefore have the effect of depriving our stockholders of an
opportunity to sell their shares at a premium over prevailing market prices to a
third party bidder.


                                      -10-
<PAGE>   12
                                 USE OF PROCEEDS

Gartner Group will not receive any of the proceeds from the sale of the shares
listed below. All proceeds from the sale of the shares will be for the account
of the selling stockholders, as described below. See "Selling Stockholders" and
"Plan of Distribution."


                              SELLING STOCKHOLDERS

The following table sets forth, as of the date of this prospectus, the name of
each of the selling stockholders, the number of shares of Common Stock that each
selling stockholder owns, the number of shares of Common Stock owned by each
selling stockholder that may be offered for sale from time to time by this
prospectus, and the number of shares of Common Stock to be held by each selling
stockholder assuming the sale of all the Common Stock offered hereby.

The shares being offered by the selling stockholders were acquired from Gartner
Group in connection with our acquisition of G2R, Inc., a California corporation,
in January 1999, and our acquisition of The Research Board, Inc., a New York
corporation, in May 1998. We may amend or supplement this prospectus from time
to time to update the disclosure set forth herein.


<TABLE>
<CAPTION>
                                             SHARES BENEFICIALLY OWNED   NUMBER OF SHARES   SHARES BENEFICIALLY OWNED
        NAME OF SELLING STOCKHOLDER            PRIOR TO OFFERING(1)           BEING             AFTER OFFERING(1)
        ---------------------------          ------------------------------------------------------------------------
                                               NUMBER        PERCENT         OFFERED          NUMBER        PERCENT
                                               ------        -------         -------          ------        -------
<S>                                            <C>           <C>            <C>               <C>           <C>
James Grugan                                       353 (2)      *               353             -              *
The Graham and Nicole Kemp                     357,980 (3)      *           357,980             -              *
   Family Trust

Naomi Von Simson                                91,973 (4)      *            91,973             -              *

Ernest Von Simson                               91,972 (5)      *            91,972             -              *

          Total                                542,278          *           542,278             -              *
</TABLE>

*    Less than 1%

(1)  Based upon [101,097,930] shares of Company Common Stock outstanding as of
     the close of business on [April 2, 1999] and including the shares to be
     sold hereunder.

(2)  71 of these shares are held in escrow with U.S. Bank Trust.

(3)  71,596 of these shares are held in escrow with U.S. Bank Trust.

(4)  59,355 of these shares are held in escrow with State Street Bank and Trust
     Company.

(5)  59,354 of these shares are held in escrow with State Street Bank and Trust
     Company.


                                      -11-
<PAGE>   13
                              PLAN OF DISTRIBUTION

The shares covered by this prospectus may be offered and sold from time to time
by the selling stockholders. The selling stockholders will act independently of
Gartner Group in making decisions with respect to the timing, manner and size of
each sale. The selling stockholders may sell the shares being offered hereby on
the New York Stock Exchange, or otherwise, at prices and under terms then
prevailing or at prices related to the then current market price, at varying
prices or at negotiated prices. The shares offered hereby may be sold, without
limitation, by one or more of the following means of distribution: (a) a block
trade in which the broker-dealer so engaged will attempt to sell such shares as
agent, but may position and resell a portion of the block as principal to
facilitate the transaction; (b) purchases by a broker-dealer as principal and
resale by such broker-dealer for its own account pursuant to this prospectus;
(c) an over-the-counter distribution in accordance with the rules of the New
York Stock Exchange; (d) ordinary brokerage transactions and transactions in
which the broker solicits purchasers; and (e) privately negotiated transactions.
To the extent required, this prospectus may be amended and supplemented from
time to time to describe a specific plan of distribution.

In connection with distributions of the shares offered hereby, the selling
stockholders may enter into hedging transactions with broker-dealers or other
financial institutions. In connection with such transactions, broker-dealers or
other financial institutions may engage in short sales of Gartner Group's common
stock in the course of hedging the positions they assume with selling
stockholders. The selling stockholders may also sell our common stock short and
deliver the shares offered hereby to close out such short positions. The selling
stockholders may also enter into option or other transactions with
broker-dealers or other financial institutions which require the delivery to
such broker-dealer or other financial institution of shares offered hereby,
which shares such broker-dealer or other financial institution may resell
pursuant to this prospectus (as supplemented or amended to reflect such
transaction). The selling stockholders may also pledge the shares offered hereby
to a broker-dealer or other financial institution, and, upon a default, such
broker-dealer or other financial institution, may effect sales of the pledged
shares pursuant to this prospectus (as supplemented or amended to reflect such
transaction). In addition, any shares offered hereby that qualify for sale
pursuant to Rule 144 may, at the option of the holder thereof, be sold under
Rule 144 rather than pursuant to this prospectus.

Any broker-dealer participating in such transactions as agent may receive
commissions from the selling stockholder and/or purchasers of the shares offered
hereby (and, if it acts as agent for the purchaser of such shares, from such
purchaser). Usual and customary brokerage fees will be paid by the selling
stockholder. Broker-dealers may agree with the selling stockholder to sell a
specified number of shares at a stipulated price per share, and, to the extent
such a broker-dealer is unable to do so acting as agent for the selling
stockholder, it may purchase as principal any unsold shares at the price
required to fulfill the broker-dealer commitment to the selling stockholder.
Broker-dealers who acquire shares as principal may thereafter resell such shares
from time to time in transactions (which may involve cross and block
transactions and which may involve sales to and through other broker-dealers,
including transactions of the nature described above) in the over-the-counter
market, in negotiated transactions or otherwise at market prices prevailing at
the time of sale or at negotiated prices, and in connection with such resales,
may pay to or receive from the purchasers of such shares commissions computed as
described above.

To comply with the securities laws of certain states, if applicable, the shares
offered hereby will be sold in such jurisdictions only through registered or
licensed brokers or dealers. In addition, in certain states the shares offered
hereby may not be sold unless they have been registered or qualified for sale in
the applicable state or an exemption from the registration or qualification
requirement is available and is complied with.


                                      -12-
<PAGE>   14
We have advised the selling stockholders that the anti-manipulation rules of
Regulation M of the Exchange Act may apply to sales of the shares offered hereby
in the market and to the activities of the selling stockholders and their
affiliates. In addition, we will make copies of this prospectus available to the
selling stockholders and have informed them of the need for delivery of copies
of this prospectus to purchasers at or prior to the time of any sale of the
shares offered hereby. The selling stockholders may indemnify any broker-dealer
that participates in transactions involving the sale of the shares against
certain liabilities, including liabilities arising under the Securities Act.

At the time a particular offer of shares is made, if required, a prospectus
supplement will be distributed that will set forth the number of shares being
offered and the terms of the offering, including the name of any underwriter,
dealer or agent, the purchase price paid by any underwriter, any discount,
commission and other item constituting compensation, any discount, commission or
concession allowed or reallowed or paid to any dealer, and the proposed selling
price to the public.

                    INDEMNIFICATION OF DIRECTORS AND OFFICERS

Our Certificate of Incorporation limits the liability of our directors for
monetary damages to the maximum extent permitted by Delaware law. Delaware law
provides that directors of a corporation will not be liable personally for
monetary damages for breach of their fiduciary duties as directors, except for
liability (i) for any breach of their duty of loyalty to the corporation or its
stockholders; (ii) for acts or omissions not made in good faith or that involve
intentional misconduct or a knowing violation of law; (iii) for unlawful
payments of dividends or unlawful stock repurchases or redemptions as provided
in Section 174 of the Delaware General Corporation Law; or (iv) for any
transaction from which the director derived an improper personal benefit.

Our Bylaws provide that we must indemnify our directors and executive officers
and may indemnify our other officers, employees and agents to the fullest extent
permitted by law. Our Bylaws also permit us to secure insurance on behalf of any
officer, director, employee or other agent for any liability arising out of his
or her actions in such capacity, regardless of whether the Bylaws would permit
indemnification.

We have entered into agreements to indemnify our directors and officers, in
addition to the indemnification provided for in our Bylaws. These agreements,
among other things, indemnify our directors and officers for certain expenses
(including attorneys' fees), judgments, fines and settlement amounts incurred by
any such person in any action or proceeding, including any action by or in the
right of Gartner Group, arising out of such person's services as a director or
officer of Gartner Group, or any subsidiary of Gartner Group or any other
company or enterprise to which the person provides services at our request.

We also maintain an insurance policy insuring our directors and officers against
liability for certain acts and omissions while acting in their official
capacities.

Insofar as indemnification for liabilities arising under the Securities Act of
1933 may be permitted to directors, officers or persons controlling Gartner
Group pursuant to the foregoing provisions, we have been informed that in the
opinion of the Securities and Exchange Commission such indemnification is
against public policy as expressed in the Act and is therefore unenforceable.


                                      -13-
<PAGE>   15
                                  LEGAL MATTERS

Certain legal matters relating to the validity of the securities offered hereby
will be passed upon for Gartner Group by Wilson Sonsini Goodrich & Rosati,
Professional Corporation, Palo Alto, California.


                                     EXPERTS

The consolidated financial statements and schedule of Gartner Group, Inc. and
subsidiaries as of September 30, 1998 and 1997, and for each of the years in the
three-year period ended September 30, 1998, have been incorporated by reference
herein and in the registration statement in reliance upon the reports of KPMG
LLP, independent certified public accountants, incorporated by reference herein,
and upon the authority of said firm as experts in accounting and auditing.


                                      -14-
<PAGE>   16
================================================================================


                                 542,278 Shares


                               GARTNER GROUP, INC.



                                  COMMON STOCK



                                   PROSPECTUS




                                 April 21, 1999



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

<PAGE>   17
                                     PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 14.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.

         The fees and expenses incurred by Gartner Group in connection with the
offering are payable by Gartner Group and, other than filing fees, are estimated
as follows:


<TABLE>
<S>                                                                              <C>
         Securities and Exchange Commission Registration Fee..................   $ 3,062

         Legal Fees and Expenses..............................................   $10,000

         Accounting Fees......................................................   $ 6,000

         Miscellaneous........................................................   $ 2,000

                  Total.......................................................   $21,062
</TABLE>

ITEM 15.  INDEMNIFICATION OF OFFICERS AND DIRECTORS.

The Delaware General Corporation Law provides that directors of a corporation
will not be personally liable for monetary damages for breach of their fiduciary
duties as directors, except for liability (i) for any breach of their duty of
loyalty to the corporation or its stockholders; (ii) for acts or omissions not
in good faith or that involve intentional misconduct or a knowing violation of
law; (iii) for unlawful payments of dividends or unlawful stock repurchases or
redemptions as provided in Section 174 of the Delaware General Corporation Law;
or (iv) for any transaction from which the director derived an improper personal
benefit. In accordance with Delaware law, the Company's Amended and Restated
Certificate of Incorporation (the "Restated Certificate") contains a provision
to limit the personal liability of directors for violations of their fiduciary
duty. This provision eliminates the personal liability of directors for monetary
damages for actions involving a breach of their fiduciary duty of care,
including any such actions involving gross negligence.

The Restated Certificate and the Company's Amended and Restated Bylaws provide
that the Company shall indemnify its officers and directors to the fullest
extent permitted by law. [The Company has entered into indemnification
agreements with each of its directors and officers.] These agreements provide
indemnification under certain circumstances for acts or omissions that may not
be covered by directors' and officers' liability insurance

ITEM 16.  EXHIBITS.

         The following exhibits are filed with this Registration Statement:

Exhibit
Number        Description
- ------        -----------
4.1           Section 5.1 of the Agreement and Plan of Merger dated as of
              December 23, 1998 by and among Gartner Group, Inc., G2R, Inc. and
              Graham Kemp.

5.1           Opinion of Wilson, Sonsini, Goodrich & Rosati, Professional
              Corporation

23.1          Consent of Wilson Sonsini Goodrich & Rosati, Professional
              Corporation (included in Exhibit 5.1).

23.2          Consent of KPMG LLP
<PAGE>   18
24.1          Power of Attorney (included on pg. II-4 of this Registration
              Statement under the caption "Signatures").


ITEM 17.  UNDERTAKINGS.

         A.       The undersigned Registrant hereby undertakes:

         (1) To file, during any period in which offers or sales are being made,
a post-effective amendment to this Registration Statement: (i) to include any
prospectus required by section 10(a)(3) of the Securities Act; (ii) to reflect
in the prospectus any facts or events arising after the effective date of the
Registration Statement (or the most recent post-effective amendment thereof)
which, individually or in the aggregate, represent a fundamental change in the
information set forth in the Registration Statement. Notwithstanding the
foregoing, any increase or decrease in volume of securities offered (if the
total dollar value of securities offered would not exceed that which was
registered) and any deviation from the low or high end of the estimated maximum
offering range may be reflected in the form of prospectus filed with the
Commission pursuant to Rule 424(b) (Section 230.424(b) of this chapter) if, in
the aggregate, the changes in volume and price represent no more than a 20%
change in the maximum aggregate offering price set forth in the "Calculation of
Registration Fee" table in the effective registration statement; and (iii) to
include any material information with respect to the plan of distribution not
previously disclosed in the Registration Statement or any material change to
such information in the Registration Statement; provided, however, that (i) and
(ii) do not apply if the Registration Statement is on Form S-3, Form S-8 or Form
F-3, and the information required to be included in a post-effective amendment
by (i) and (ii) is contained in periodic reports filed with or furnished to the
Commission by the Registrant pursuant to Section 13 or Section 15(d) of the
Exchange Act that are incorporated by reference in the Registration Statement.

         (2) That, for the purpose of determining any liability under the
Securities Act, each such post-effective amendment shall be deemed to be a new
registration statement relating to the securities offered therein, and the
offering of such securities at that time shall be deemed to be the initial bona
fide offering thereof.

         (3) To remove from registration by means of a post-effective amendment
any of the securities being registered which remain unsold at the termination of
the offering.

         B. Undertaking Regarding Filings Incorporating Subsequent Exchange Act
Documents by Reference.

The undersigned Registrant hereby undertakes that, for purposes of determining
any liability under the Securities Act of 1933, each filing of the Registrant's
annual report pursuant to Section 13(a) or 15(d) of the Securities Exchange Act
of 1934 (and, where applicable, each filing of an employee benefit plan's annual
report pursuant to Section 15(d) of the Securities Exchange Act of 1934) that is
incorporated by reference in the Registration Statement shall be deemed to be a
new registration statement relating to the securities offered therein, and the
offering of such securities at that time shall be deemed to be the initial bona
fide offering thereof.

         C. Undertaking Regarding Indemnification.

Insofar as indemnification for liabilities arising under the Securities Act of
1933 may be permitted to directors, officers and controlling persons of the
registrant pursuant to the provisions described in Item 15 above, or otherwise,
the Registrant has been advised that in the opinion of the Securities and
Exchange Commission such 


                                      II-2
<PAGE>   19
indemnification is against public policy as expressed in the Securities Act and
is, therefore, unenforceable. In the event that a claim for indemnification
against liabilities (other than the payment by the Registrant of expenses
incurred or paid by a director, officer or controlling person of the Registrant
in the successful defense of any action, suit or proceeding) is asserted by such
director, officer or controlling person in connection with the securities being
registered, the Registrant will, unless in the opinion of its counsel the matter
has been settled by controlling precedent, submit to a court of appropriate
jurisdiction the question whether such indemnification by it is against public
policy as expressed in the Securities Act and will be governed by the final
adjudication of such issue.

         D. Undertaking Regarding Registration Statement Permitted by Rule 430A.

         (1) For purposes of determining any liability under the Securities Act
of 1933, the information omitted from the form of prospectus filed as part of
this registration statement in reliance upon Rule 430A and contained in a form
of prospectus filed by the Registrant pursuant to Rule 424(b)(1) or (4) or
497(h) under the Securities Act shall be deemed to be part of this Registration
Statement as of the time it was declared effective.

         (2) For the purpose of determining liability under the Securities Act
of 1933, each post-effective amendment that contains a form of prospectus shall
be deemed to be a new registration statement relating to the securities offered
therein, and the offering of such securities at that time shall be deemed to be
the initial bona fide offering thereof.


                                      II-3
<PAGE>   20
                                   SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, as amended, the
Registrant certifies that it has reasonable cause to believe that it meets all
of the requirements for filing on Form S-3 and has duly caused this Registration
Statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in the City of Stamford, State of Connecticut on April , 1999.

                                         GARTNER GROUP, INC.

                                         By:   /s/ Michael Fleisher
                                               --------------------------------
                                                   Michael Fleisher
                                                   Chief Financial Officer

                                POWER OF ATTORNEY

Each person whose signature appears below constitutes and appoints William T.
Clifford and Michael Fleisher and each of them, as attorneys-in-fact, each with
the power of substitution, for him or her in any and all capacities, to sign any
amendment to this Registration Statement and to file the same, with exhibits
thereto and other documents in connection therewith, with the Securities and
Exchange Commission, granting to said attorneys-in-fact, and each of them, full
power and authority to do and perform each and every act and thing requisite and
necessary to be done in connection therewith, as fully to all intents and
purposes as he or she might or could do in person, hereby ratifying and
confirming all that said attorneys-in-fact or any of them, or their or his
substitute or substitutes, may lawfully do or cause to be done by virtue hereof.

Pursuant to the requirements of the Securities Act of 1933, as amended, this
Registration Statement has been signed below by the following persons in the
capacities and on the dates indicated.

<TABLE>
<CAPTION>
                   Signature                                           Title                               Date
                   ---------                                           -----                               ----

<S>                                               <C>                                                  <C> 
/s/  William T. Clifford                          Director, President and Chief Executive Officer      April 3, 1999
- --------------------------------------------
     William T. Clifford

/s/  Michael Fleisher                                  Executive Vice President, Finance and           April 3, 1999
- --------------------------------------------        Administration, and Chief Financial Officer
     Michael Fleisher                               

/s/  Manual A. Fernandez                                 Director and Chairman of the Board            April 2, 1999
- --------------------------------------------
     Manual A. Fernandez

/s/  William O. Grabe                                                 Director                         April 1, 1999
- --------------------------------------------
     William O. Grabe

/s/  Max D. Hopper                                                    Director                         April 2, 1999
- --------------------------------------------
     Max D. Hopper

/s/  John P. Imley, Jr.                                               Director                         April 1, 1999
- --------------------------------------------
     John P. Imley, Jr.

/s/  Stephen G. Pagliuca                                              Director                         April 2, 1999
- --------------------------------------------
     Stephen G. Pagliuca

/s/  Dennis G. Sisco                                                  Director                         April 2, 1999
- --------------------------------------------
     Dennis G. Sisco

/s/                                                                   Director      
- --------------------------------------------
     Robert E. Weissman
</TABLE>


                                      II-4
<PAGE>   21
     Robert E. Weissman


                                  EXHIBIT INDEX

Exhibit
Number                                      Description
- ------                                      -----------
    4.1           Section 5.1 of the Agreement and Plan of Merger dated as of
                  December 23, 1998 by and among Gartner Group, Inc., G2R, Inc.
                  and Graham Kemp.

    5.1           Opinion of Wilson, Sonsini, Goodrich & Rosati, Professional
                  Corporation

   23.1           Consent of Wilson Sonsini Goodrich & Rosati, Professional
                  Corporation (included in Exhibit 5.1).

   23.2           Consent of KPMG LLP

   24.1           Power of Attorney (included on pg. II-4 of this Registration
                  Statement under the caption "Signatures").


                                      II-5

<PAGE>   1
                                   EXHIBIT 4.1









                          AGREEMENT AND PLAN OF MERGER

                                  BY AND AMONG

                               GARTNER GROUP, INC.

                                    G2R, INC.

                                       AND

                                   GRAHAM KEMP




                          DATED AS OF DECEMBER 23, 1998
<PAGE>   2
                  5.1      Registration.

                           (a)      Within forty-five (45) days following the
Effective Time, Gartner shall prepare and file with the SEC a Registration
Statement on Form S-3 (the "S-3") to register under the Securities Act of 1933
(the "1933 Act") all shares of Gartner Common Stock issued in connection with
the Merger. The Company shall provide to Gartner and its counsel for inclusion
in the S-3, in form and substance reasonably satisfactory to Gartner and its
counsel, such information concerning the Company and its shareholders as Gartner
or its counsel may reasonably request. Gartner shall use its reasonable
commercial efforts to respond to any comments of the SEC, with the reasonable
assistance and consent of the Company, to have the S-3 declared effective under
1933 Act as promptly as practicable after such filing, and to cause the
prospectus incorporated therein to be mailed to the Company Shareholders who
receive Gartner Common Stock on the Merger at the earliest practicable time
after the S-3 has been declared effective by the SEC. Whenever any event occurs
which should be set forth in an amendment or supplement to the S-3 filing,
Gartner or the Company, as the case may be, shall promptly inform the other
company of such occurrence and cooperate in filing with the SEC such amendment
or supplement. Except as provided by Section 5.1(b), Gartner shall use
reasonable commercial efforts to maintain the effectiveness of such S-3 until
twelve (12) months following the Effective Time.

                           (b)      Gartner shall have the right, upon giving
notice of the exercise of such right (the "Delay Notice") to each Company
Shareholder who receives Gartner Common Stock, to require the Company
Shareholders not to sell any Gartner Common Stock pursuant to the S-3 filed
pursuant to Section 5.1 for a reasonable period (as determined in good faith by
the Board of Directors of Gartner (the "Board")) from the date on which such
notice is given, if (i)(A) Gartner is engaged in or proposes to engage in
discussions or negotiations with respect to, or has proposed or taken a
substantial step to commence, or there otherwise is pending, any merger,
acquisition, other form of business combination, divestiture, tender offer,
financing or other transaction, or there is an event or state of facts relating
to Gartner, in each case which is material to Gartner (as determined in good
faith by the Board) (any such negotiation, step, event or state of facts being
herein called a "Material Activity"), (B) in the reasonable judgment of the
Board, after consultation with counsel, disclosure of such Material Activity
would be necessary or advisable so as to permit the Gartner Common Stock to be
sold in compliance with applicable laws and (C) such disclosure would, in the
reasonable judgment of the Board, be adverse to the interests of Gartner, or
(ii) the Board, in its reasonable judgment, deems it necessary to file a
post-effective amendment to the S-3 or to prepare a supplement to, or otherwise
amend, the form of prospectus contained therein; and during any such period each
Company Shareholder agrees not to sell any Gartner Common Stock under the S-3
for such period of time as the Board, upon the advice of counsel, may in good
faith deem advisable.

<PAGE>   1
                                                                     Exhibit 5.1


                                 April 21, 1999

Gartner Group, Inc.
P.O. Box 10212
56 Top Gallant Road
Stamford, CT 06904-2212

         RE:  REGISTRATION STATEMENT ON FORM S-3

Ladies and Gentlemen:

         We have examined the Registration Statement on Form S-3 to be filed by
you with the Securities and Exchange Commission on or about April 21, 1999 (the
"Registration Statement"), in connection with the registration under the
Securities Act of 1933, as amended, of a total of 542,278 shares of your Common
Stock (the "Shares"). We understand that the Shares are to be sold from time to
time on the New York Stock Exchange at prevailing prices or as otherwise
described in the Registration Statement. As legal counsel for Gartner Group,
Inc., we have examined the proceedings taken by you in connection with the sale
of the Shares.

         It is our opinion that the Shares are legally and validly issued, fully
paid and nonassessable.

         We consent to the use of this opinion as an exhibit to the Registration
Statement and further consent to the use of our name wherever appearing in the
Registration Statement and any amendments to it.

                                       Very truly yours,
   
                                       /s/ Wilson Sonsini Goodrich & Rosati
                                       ------------------------------------
                                       WILSON SONSINI GOODRICH & ROSATI
                                       Professional Corporation


<PAGE>   1
                                                                    Exhibit 23.2


                          INDEPENDENT AUDITORS' CONSENT

The Board of Directors
Gartner Group, Inc.

We consent to the use of our reports incorporated by reference herein and to the
reference to our firm under the heading "Experts" in the prospectus.

                                              /s/      KPMG LLP

St. Petersburg, Florida
April 21, 1999



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