Washington, D.C. 20549

                                  SCHEDULE 13G

                   Under the Securities Exchange Act of 1934
                      (Amendment No. ___________________)*

                             FORRESTER RESEARCH INC
                                (Name of Issuer)

                                  COMMON STOCK
                         (Title of Class of Securities)

                                 (CUSIP Number)

Check the following  box if a fee is being paid with this  statement [ ]. (A fee
is not required only if the filing person:  (1) has a previous statement on file
reporting  beneficial  ownership  of more  than  five  percent  of the  class of
securities  described  in Item 1;  and (2) has  filed  no  amendment  subsequent
thereto reporting  beneficial  ownership of five percent or less of such class.)
(See Rule 13d-7.)

* 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 the
disclosures provided in a prior cover page.

The information required in 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

CUSIP No. 34653109 13G Page 2 of 5 Pages - -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON CRAMER ROSENTHAL MCGLYNN, LLC IRS ID# 13-3156718 - -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [X] - -------------------------------------------------------------------------------- 3 SEC USE ONLY - -------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION INCORPORATED IN THE STATE OF NEW YORK - -------------------------------------------------------------------------------- NUMBER OF 5 SOLE VOTING POWER SHARES 0 BENEFICIALLY ------------------------------------------------------------- OWNED BY 6 SHARED VOTING POWER EACH 1,305,800 REPORTING -------------------------------------------------------------- PERSON 7 SOLE DISPOSITIVE POWER WITH 0 -------------------------------------------------------------- 8 SHARED DISPOSITIVE POWER 1,305,800 - -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,305,800 - -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* - -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 5.695% - -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* IA - -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT

Page 3 of 5 Pages Item 1. (a) Name of Issuer: FORRESTER RESEARCH INC (b) Address of Issuer's Principal Executive Offices: 400 Technology Square Cambridge, MA 02139 Item 2. (a) Name of Person Filing: CRAMER ROSENTHAL MCGLYNN, LLC (b) Address of Principal Business Office: 707 WESTCHESTER AVE, WHITE PLAINS, NY 10604 (c) Citizenship: INCORPORATED IN THE STATE OF NEW YORK (d) Title of Class of Securities: COMMON STOCK (e) CUSIP Number: 34653109 Item 3. If this statement is filed pursuant to Rules 13d-1(b), or 13d-2(b), check whether the person filing is a: (a) [ ] Broker or Dealer registered under Section 15 of the Act (b) [ ] Bank as defined in section 3(a)(6) of the Act (c) [ ] Insurance Company as defined in section 3(a)(19) of the Act (d) [ ] Investment Company registered under section 8 of the Investment Company Act (e) [X] Investment Adviser registered under section 203 of the Investment Advisers Act of 1940 (f) [ ] Employee Benefit Plan, Pension Fund which is subject to the provisions of the Employee Retirement Income Security Act of 1974 or Endowment Fund; see Section 240.13d-1(b)(1)(ii)(F) (g) [ ] Parent Holding Company, in accordance with Section 240.13d-1(b)(1)(ii)(G) (h) [ ] Group, in accordance with Section 240.13d- 1(b)(1)(ii)(H)

Page 4 of 5 Pages Item 4. Ownership. 1,305,800 Item 5. Ownership of Five Percent or Less of a Class. ONE CLASS OF STOCK 5.695% Item 6. Ownership of More Than Five Percent on Behalf of Another Person. NOT APPLICABLE Item 7. Identification and Classification of the Subsidiary which Acquired the Security Being Reported on By the Parent Holding Company. NOT APPLICABLE Item 8. Identification and Classification of Members of the Group. NOT APPLICABLE Item 9. Notice of Dissolution of Group. NOT APPLICABLE Item 10. Certification. By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired in the ordinary course of business and were not acquired for the purpose of and do not have the effect of changing or influencing the control of the issuer of such securities and were not acquired in connection with or as a participant in any transaction having such purpose or effect.

Signature. /s/ MICHAEL J. MARRONE VP - DIRECTOR OF OPERATIONS 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. Date: 02/12/2002 By: MICHAEL J. MARRONE VP - DIRECTOR OF OPERATIONS ---------------------------