EXHIBIT 32.2



                            CERTIFICATION PURSUANT TO
            SECTION 1350, CHAPTER 63 OF TITLE 18, UNITED STATES CODE,
                             AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

Pursuant to Section 1350, Chapter 63 of Title 18, United States Code, as
adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, the
undersigned, as Chief Financial Officer of Forrester Research, Inc. (the
"Company"), does hereby certify that to the undersigned's knowledge:

      1)    the Company's Annual Report on Form 10-K for the year ended
            December 31, 2003 fully complies with the requirements of Section
            13(a) or 15(d) of the Securities Exchange Act of 1934; and

      2)    the information contained in the Company's Annual Report on Form
            10-K for the year ended December 31, 2003 fairly presents, in all
            material respects, the financial condition and results of
            operations of the Company.

                                    /s/  Warren Hadley
                                    ------------------------------
                                    Warren Hadley
                                    Chief Financial Officer and Treasurer

Dated: March 11, 2004