SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

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

                                    FORM 8-K

                                 CURRENT REPORT
                     PURSUANT TO SECTION 13 OR 15(d) OF THE
                         SECURITIES EXCHANGE ACT OF 1934



Date of report (Date of earliest event reported): October 27, 2004

                            FORRESTER RESEARCH, INC.
                 (Exact Name of Registrant Specified in Charter)

          Delaware                 000-21433                  04-2797789
 (State or Other Jurisdiction     (Commission              (I.R.S. Employer
      of Incorporation)           File Number)             Identification No.)


400 Technology Square, Cambridge, Massachusetts             02139
(Address of Principal Executive Offices)                  (Zip Code)



Registrant's telephone number, including area code: (617) 613-6000


                                      N/A
- --------------------------------------------------------------------------------
         (Former Name or Former Address, if Changed Since Last Report)




                                  Page 1 of 5
                        Exhibit Index appears on Page 4

ITEM 2.02 RESULTS OF OPERATIONS AND FINANCIAL CONDITION. The information contained in this current report on Form 8-K is furnished pursuant to Item 2.02 of Form 8-K "Results of Operations and Financial Condition". This information and the exhibits hereto are being furnished and shall not be deemed to be "filed" for the purposes of Section 18 of, or otherwise regarded as filed under, the Securities Exchange Act of 1934, as amended. The information contained in this report shall not be incorporated by reference into any filing of Forrester Research, Inc. with the SEC, whether made before or after the date hereof, regardless of any general incorporation language in such filings. On October 27, 2004, Forrester Research, Inc. issued a press release announcing its financial results for the quarter ended September 30, 2004, the full text of which is attached hereto as Exhibit 99.1. Forrester believes that pro forma financial results provide investors with consistent and comparable information to aid in the understanding of Forrester's ongoing business. Our pro forma presentation excludes the following: Amortization of acquisition-related intangibles - we exclude the non-cash effect of the amortization of acquisition-related intangibles from our pro forma results in order to more consistently present our ongoing results of operations. Impairments of non-marketable securities - we have consistently excluded both one-time gains and one-time write-offs related to our investments in non-marketable securities from our pro forma results in order to keep quarter over quarter comparisons consistent. Reorganization costs - we exclude reorganization costs in order to present a consistent basis for quarterly comparisons and to more consistently present our results of operations. However, these measures should be considered in addition to, not as a substitute for, or superior to, operating income or other measures of financial performance prepared in accordance with generally accepted accounting principles as more fully discussed in the Forrester's financial statements and filings with the Securities and Exchange Commission. - 2 -

SIGNATURE Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. FORRESTER RESEARCH, INC. By: /s/ WARREN HADLEY ----------------- Name: Warren Hadley Title: Treasurer and Chief Financial Officer Dated: October 27, 2004 - 3 -

Exhibit Index Exhibit Description Page ------- ----------- ---- 99.1 Press Release dated October 27, 2004. 5 - 4 -

                                                                    EXHIBIT 99.1

Forrester Research Announces Third-Quarter 2004 Financial Results

    CAMBRIDGE, Mass.--(BUSINESS WIRE)--Oct. 27, 2004--Forrester
Research, Inc. (Nasdaq: FORR) today announced its third-quarter ended
September 30, 2004 financial results.

    Third-Quarter Financial Performance

    --  Total revenues were $33.9 million, compared with $32.2 million
        for the third quarter of last year.

    --  On a GAAP-reported basis, which reflects an effective tax rate
        of 33.5 percent, Forrester reported third-quarter net income
        of $3.2 million or $0.14 per diluted share, compared with net
        income of $186,000, or $0.01 per diluted share, for the same
        period last year.

    --  On a pro forma basis, which excludes amortization of $1.4
        million of acquisition-related intangible assets, gains
        resulting from sales of marketable securities and
        non-marketable investments totaling $1.0 million, and which
        reflects a pro forma effective tax rate of 35 percent, net
        income was $3.4 million, or $0.15 per diluted share, for the
        third quarter of 2004. This compares with pro forma net income
        of $2.8 million, or $0.12 per diluted share, for the same
        period in 2003, which excluded amortization of $2.6 million of
        acquisition-related intangible assets, reorganization costs of
        $1.2 million, costs of $167,000 related to the integration of
        Giga Information Group, Inc., and a pro forma effective tax
        rate of 35 percent.

    Nine-Month Period Ended September 30, 2004, Financial Performance

    --  Total revenues were $100.5 million, compared with $90.7
        million for the same period last year.

    --  On a GAAP-reported basis, which reflects an effective tax rate
        of 33.5 percent, Forrester reported net income of $606,000, or
        $0.03 per diluted share for the nine months ended 2004,
        compared to net income of $2.1 million or $0.09 per diluted
        share for the same period last year.

    --  On a pro forma basis, which excludes amortization of $5.1
        million of acquisition-related intangible assets,
        reorganization costs of $8.8 million related primarily to
        office space consolidations, gains resulting from sales of
        marketable securities and non-marketable investments totaling
        $1.0 million, and which reflects a pro forma effective tax
        rate of 35 percent, net income was $8.9 million, or $0.40 per
        diluted share, for the nine months ended 2004. This compares
        with pro forma net income of $7.4 million, or $0.33 per
        diluted share for the same period last year, which excludes
        amortization of $6.1 million of acquisition-related intangible
        assets, reorganization costs of $1.2 million, costs of
        $938,000 related to the integration of Giga Information Group,
        Inc., a net loss of $63,000 resulting from sales of marketable
        securities and non-marketable investments, and a pro forma
        effective tax rate of 35 percent.

    A reconciliation of GAAP results to pro forma results may be found
in the attached financial tables.

    "The second half of the year got off to a good start in the third
quarter," said George F. Colony, chairman of the board and chief
executive officer. "Dollar retention significantly improved to 86
percent, up from 73 percent a year ago. Forrester's key financial
metrics were positive during the third quarter: renewals and
enrichment were strong, cross-sell opportunities increased, and client
company retention continued on the upswing. In the fourth quarter, we
will remain focused on our busiest season for renewals while
attracting more new business before the end of the year."

    Forrester is providing fourth-quarter and reaffirming full-year
2004 guidance as follows:

    Fourth-Quarter 2004 (GAAP):

    --  Total revenues of approximately $35.0 million to $37.0
        million.

    --  Operating margin of approximately 8 percent to 10 percent.

    --  Interest income of approximately $650,000.

    --  An effective tax rate of 33.5 percent.

    --  Diluted earnings per share of approximately $0.10 to $0.12.

    Fourth-Quarter 2004 (Pro Forma):

    Pro forma financial guidance for the fourth quarter of 2004
excludes amortization of acquisition-related intangible assets of
approximately $1.3 million, as well as all gains and impairment
charges related to marketable securities and non-marketable
investments.

    --  Pro forma operating margin of approximately 13 percent to 15
        percent.

    --  Pro forma effective tax rate of 35 percent, which varies from
        our actual effective tax rate of 33.5 percent due to our
        tax-free interest income decreasing as a percentage of our pro
        forma pre-tax income.

    --  Pro forma diluted earnings per share of approximately $0.15 to
        $0.17.

    Full-Year 2004 (GAAP):

    --  Total revenues of approximately $133.0 million to $138.0
        million.

    --  Operating margin of approximately 0 percent to 2 percent.

    --  Interest income of approximately $2.7 million to $2.8 million.

    --  An effective tax rate of 33.5 percent.

    --  Diluted earnings per share of approximately $0.10 to $0.14.

    Full-Year 2004 (Pro Forma):

    Pro forma financial guidance for full-year 2004 excludes
amortization of acquisition-related intangible assets of approximately
$6.5 million, all gains and impairment charges related to
non-marketable securities, and reorganization and integration charges
of approximately $8.8 million.

    --  Pro forma operating margin of approximately 11 percent to 13
        percent.

    --  Pro forma effective tax rate of 35 percent, which varies from
        our actual effective tax rate of 33.5 percent due to our
        tax-free interest income decreasing as a percentage of our pro
        forma pre-tax income.

    --  Pro forma diluted earnings per share of approximately $0.52 to
        $0.57.

    Forrester is an independent technology research company that
provides pragmatic and forward-thinking advice about technology's
impact on business. Business, marketing, and IT professionals
worldwide collaborate with Forrester to align their technology
investments with their business goals. Forrester offers products and
services in four major areas: Research, Data, Consulting, and
Community. Established in 1983, Forrester is headquartered in
Cambridge, Mass. For additional information, visit www.forrester.com.

    This press release contains forward-looking statements within the
meaning of the Private Securities Litigation Reform Act of 1995. These
statements include, but are not limited to, Forrester's financial and
operating targets for the third quarter of and full-year 2004,
statements about the potential success of product offerings, the
ability to achieve all of the anticipated benefits from the
acquisition of Giga Information Group, the amount of the charge and
any cost savings related to reductions in force and associated
actions, and the ability of Forrester to achieve success as the
economy improves. These statements are based on Forrester's current
plans and expectations and involve risks and uncertainties that could
cause actual future activities and results of operations to be
materially different from those set forth in the forward-looking
statements. Important factors that could cause actual future
activities and results to differ include, among others, Forrester's
ability to anticipate business and economic conditions, market trends,
competition, the ability to attract and retain professional staff,
possible variations in Forrester's quarterly operating results, risks
associated with Forrester's ability to offer new products and
services, any cost savings related to reductions in force and
associated actions, and Forrester's dependence on renewals of its
membership-based research services and on key personnel. Forrester
undertakes no obligation to update publicly any forward-looking
statements, whether as a result of new information, future events, or
otherwise. For further information, please refer to Forrester's
reports and filings with the Securities and Exchange Commission.

    The consolidated statements of income, consolidated balance
sheets, and consolidated statements of cash flows are attached.

    (C) 2004, Forrester Research, Inc. All rights reserved. Forrester
and WholeView 2 are trademarks of Forrester Research, Inc.


Forrester Research, Inc.
Consolidated Statements of Income
- ----------------------------------------------------------------------
(In thousands, except per share data)


                              Three months ended   Nine months ended
                                  September 30,        September 30,
                                2004       2003      2004       2003
                               ------------------  -------------------
                                   (Unaudited)         (Unaudited)

Revenues
   Research services          $ 23,544  $ 23,798   $ 69,579  $ 68,169
   Advisory services and
    other                       10,335     8,410     30,950    22,499
                               --------  --------  ---------  --------

Total revenues                  33,879    32,208    100,529    90,668

Operating expenses
   Cost of services and
    fulfillment                 13,266    12,525     40,782    36,380
   Selling and marketing        11,036    10,749     33,701    29,523
   General and administrative    4,291     3,927     11,687    10,985
   Depreciation and
    amortization                   744     1,520      2,801     5,052
   Amortization of intangible
    assets                       1,384     2,608      5,112     6,140
   Reorganization costs              -     1,230      8,751     1,230
   Integration costs                 -       167          -       938
                               --------  --------  ---------  --------

Total operating expenses        30,721    32,726    102,834    90,248

   Income (loss) from
    operations                   3,158      (518)    (2,305)      420

   Other income, net               680       787      2,168     2,692
   Gains on sales of
    marketable securities          678         -        678       509
   Non-marketable investment
    gains (impairments)            313         -        370      (572)
                               --------  --------  ---------  --------

   Income before income taxes    4,829       269        911     3,049

   Income tax provision          1,618        83        305       945
                               --------  --------  ---------  --------

   Net income                 $  3,211  $    186   $    606  $  2,104
                               ========  ========  =========  ========


   Diluted earnings per share $   0.14  $   0.01   $   0.03  $   0.09
                               ========  ========  =========  ========
   Diluted weighted average
    shares outstanding          22,345    22,741     22,577    22,793
                               ========  ========  =========  ========


   Basic earnings per share   $   0.15  $   0.01   $   0.03  $   0.09
                               ========  ========  =========  ========
   Basic weighted average
    shares outstanding          21,952    22,462     22,094    22,572
                               ========  ========  =========  ========


Pro forma data (1):
   Income (loss) from
    operations                $  3,158  $   (518)  $  (2,305) $   420
   Amortization of intangible
    assets                       1,384     2,608       5,112    6,140
   Reorganization costs              -     1,230       8,751    1,230
   Integration costs                 -       167           -      938
                               --------  --------   --------- --------
   Pro forma income from
    operations                   4,542     3,487      11,558    8,728

   Other income, net               680       787       2,168    2,692
                               --------  --------   --------- --------
   Pro forma income before
    income taxes                 5,222     4,274      13,726   11,420

   Pro forma income tax
    provision                    1,828     1,496       4,804    3,997
                               --------  --------   --------- --------

   Pro forma net income       $  3,394  $  2,778   $   8,922 $  7,423
                               ========  ========   ========= ========

   Pro forma diluted earnings
    per share                 $   0.15  $   0.12   $    0.40 $   0.33
                               ========  ========   ========= ========
   Diluted weighted average
    shares outstanding          22,345    22,741      22,577   22,793
                               ========  ========   ========= ========


(1) The pro forma data excludes amortization of intangibles and other
    integration costs related to acquisitions, reorganization costs
    and gains and impairments related to marketable and non-marketable
    investments, as well as their related tax effects. This does not
    purport to be prepared in accordance with Generally Accepted
    Accounting Principles.



Forrester Research, Inc.
Consolidated Balance Sheets
- ----------------------------------------------------------------------
(In thousands)

                                            September 30, December 31,
                                                    2004        2003
                                                ----------   ---------
                                               (Unaudited)

Assets:
  Cash and cash equivalents                    $   36,621   $  22,385
  Marketable securities                            91,779     104,348
  Accounts receivable, net                         25,113      40,013
  Deferred commissions                              5,150       5,999
  Prepaid expenses and other current assets         7,325       7,079
                                                ----------   ---------
Total current assets                              165,988     179,824
  Property and equipment, net                       6,025       8,266
  Goodwill, net                                    56,894      57,006
  Intangible assets, net                            8,345      13,456
  Deferred income taxes                            39,709      40,159
  Non-marketable investments and other assets      13,822      12,264
                                                ----------   ---------
Total assets                                   $  290,783   $ 310,975
                                                ==========   =========

Liabilities and stockholders' equity:
  Accounts payable                             $    2,570   $   2,566
  Accrued expenses                                 27,363      31,457
  Deferred revenue                                 60,769      68,630
                                                ----------   ---------
Total liabilities                                  90,702     102,653
  Preferred stock                                       -           -
  Common stock                                        246         243
  Additional paid-in capital                      177,793     172,523
  Retained earnings                                67,551      66,945
  Treasury stock, at cost                         (44,923)    (30,300)
  Accumulated other comprehensive loss               (586)     (1,089)
                                                ----------   ---------
Total stockholders' equity                        200,081     208,322
                                                ----------   ---------
Total liabilities and stockholders' equity     $  290,783   $ 310,975
                                                ==========   =========


Forrester Research, Inc.
Consolidated Statements Cash Flows
- ----------------------------------------------------------------------
(In thousands)

                                                   Nine months ended
                                                      September 30,
                                                    2004         2003
                                                   -------------------
                                                       (Unaudited)

Cash flows from operations:
  Net income                                      $    606   $  2,104
  Adjustments to reconcile net income to net cash
   provided by operating activities -
     Depreciation                                    2,801      5,052
     Amortization of intangible assets               5,112      6,140
     Non-marketable investments (gains) impairments   (370)       572
     Realized gains on sales of marketable
      securities                                      (678)      (509)
     Tax benefit from stock options                    256        239
     Deferred income taxes                              (2)       747
     Non-cash reorganization costs                   1,844          -
     Increase in provision for doubtful accounts       224          -
     Accretion of premiums on marketable securities    635        618
     Changes in assets and liabilities, net of
      acquisition -
       Accounts receivable                          15,541      9,088
       Deferred commissions                            849       (434)
       Prepaid expenses and other current assets      (296)     2,401
       Accounts payable                               (116)    (1,395)
       Accrued expenses                             (4,025)    (4,714)
       Deferred revenue                             (8,770)   (16,914)
                                                  ---------  ---------
Net cash provided by operating activities           13,611      2,995

Cash flows from investing activities:
  Acquisition of Giga Information Group, Inc.,
   net of cash acquired                                  -    (57,027)
  Purchases of property and equipment               (2,423)    (1,122)
  Purchase of non-marketable investments            (2,263)    (3,150)
  Decrease (increase) in other assets                  842     (1,439)
  Purchase of marketable securities               (107,478)  (164,338)
  Proceeds from sales and maturities of
   marketable securities                            121,623   230,641
                                                   --------- ---------
Net cash provided by investing activities            10,301     3,565

Cash flows from financing activities:
  Proceeds from issuance of common stock under
   employee stock option plans and employee stock
   purchase plan                                      2,959     2,070
  Acquisition of treasury shares                    (12,623)   (6,796)
  Structured stock repurchase                            54    (1,793)
                                                   --------- ---------
Net cash used in financing activities                (9,610)   (6,519)

Effect of exchange rate changes on cash and cash
 equivalents                                            (66)     (178)
                                                   --------- ---------

Net increase (decrease) in cash and
 cash equivalents                                    14,236      (137)

Cash and cash equivalents, beginning of period       22,385    11,479
                                                   --------- ---------

Cash and cash equivalents, end of period           $ 36,621  $ 11,342
                                                   ========= =========


    CONTACT: Forrester Research, Inc.
             Kimberly Maxwell, 617-613-6234
             Director, Investor Relations
             kmaxwell@forrester.com
             or
             Karyl Levinson, 617-613-6262
             Director, Corporate Communications
             press@forrester.com