Washington, D.C. 20549


Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
OMB Number: 3235-0287
Estimated average burden
hours per response: 0.5
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
1. Name and Address of Reporting Person*

(Last) (First) (Middle)


(City) (State) (Zip)
2. Issuer Name and Ticker or Trading Symbol
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director 10% Owner
X Officer (give title below) Other (specify below)
Chief Research Officer
3. Date of Earliest Transaction (Month/Day/Year)
4. If Amendment, Date of Original Filed (Month/Day/Year)
6. Individual or Joint/Group Filing (Check Applicable Line)
X Form filed by One Reporting Person
Form filed by More than One Reporting Person
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Common Stock 3,010 D
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year) 7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Incentive Stock Option (right to buy) $22.19 (1) 04/02/2016 Common Stock 4,061 4,061 D
Non-Qualified Stock Option (right to buy) $22.19 (1) 04/02/2016 Common Stock 3,939 3,939 D
Explanation of Responses:
1. The options are subject to forfeiture in the event Forrester does not achieve pro forma operating margin targets established by the Compensation and Nominating Committee of the Board of Directors for fiscal 2006. If the pro forma operating margin target is met, the options vest in annual increments over either two or three years from the date of grant, depending on the level of pro forma operating margin achieved.
Kimberly A. Maxwell, attorney in fact for Daniel Mahoney 04/04/2006
** Signature of Reporting Person Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
I hereby constitute and appoint each of Kimberly

Maxwell and Brittany Roberts signing singly, my true and lawful

attorney-in-fact to:

(1)	execute for and on my behalf, in my
as an officer and/or director of Forrester Research, Inc. (the
Forms 3, 4 and 5 in accordance with Section 16(a) of the
Exchange Act of 1934 and the rules thereunder;
(2)	do and
perform any and
all acts for and on my behalf that may be necessary or
desirable to
complete and execute any such Form 3, 4 or 5 and timely file
such form with
the United States Securities and Exchange Commission and
any stock exchange
or similar authority; and
(3)	take any other action
of any type
whatsoever in connection with the foregoing which, in the
opinion of such
attorney-in-fact, may be to my benefit, in my best
interest, or that I am
legally required to do, it being understood that
the documents executed by
such attorney-in-fact on my behalf pursuant to
this Power of Attorney shall
be in such form and shall contain such terms
and conditions as such
attorney-in-fact may approve in such
attorney-in-fact's discretion.

hereby grant to each such
attorney-in-fact full power and authority to do
and perform any and every
act and thing whatsoever requisite, necessary, or
proper to be done in
the exercise of any of the rights and powers herein
granted, as fully to
all intents and purposes as I might or could do if
personally present,
with full power of substitution or revocation, hereby
ratifying and
confirming all that such attorney-in-fact, or such
substitute or substitutes, shall lawfully do or cause to
be done by
virtue of this power of attorney and the rights and powers
granted.  I acknowledge that the attorneys-in-fact, in serving in
capacity at my request, are not assuming, nor is the Company assuming,

any of my responsibilities to comply with Section 16 of the Securities

Exchange Act of 1934. This Power of Attorney shall remain in full force
effect until I am no longer required to file Forms 3, 4 and 5 with
to my holdings of and transactions in Company securities, unless
I  earlier
revoke it in a signed writing delivered to the

WITNESS WHEREOF, I have caused this Power of
Attorney to be executed as of
this 1st day of April, 2003.

Daniel Mahoney

Daniel Mahoney
Print Name

Drafter's Note:  In filing a Section
16(a) report on behalf of a
reporting person, an attorney-in-fact should
indicate after the signature
line on the form that he or she is signing as
such.  The Power of
Attorney should be attached to and filed with the
report, if it has not
previously been filed with the Commission.  If it is
not practicable to
file the Power of Attorney at the time of filing of the
original report,
it should be filed as soon as practicable as an amendment
to the original
filing. The Power of Attorney need not be filed with
subsequent reports.