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1.
    
    Subject to your execution and non-revocation of this letter agreement, as well as your
continuing fulfillment of all of your obligations hereunder, Forrester will provide you with
the following:
      2.
    
    You acknowledge that you have returned to Forrester all telephone cards, credit cards,
building cards, keys, work papers, files and other documentation, and other equipment
(exclusive of the company-issued laptop computer which you may keep), computer files and
diskettes, and all other Forrester records and property, without retaining any copies or
derivations thereof.3.
    
    You have agreed to submit for reimbursement purposes all business expense reports and any
necessary supporting documentation to Forrester by December 31, 2010. The severance pay set
forth in paragraph 1(a) above will take into account a proper reconciliation of amounts due to
you from Forrester and/or amounts due to Forrester from you. These reconciliation adjustments
may include, but are not limited to, outstanding travel advances or expenses, overdue American
Express bills, unreturned Company-owned equipment, and outstanding
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expense reports. For the avoidance of doubt, in the event these obligations to Forrester
have not been previously satisfied, Forrester will offset them against any severance
compensation payable hereunder.4.
    
    The Company affirms its prior agreement to defend and indemnify you relative to any tax
liability relating to your expatriate assignment in London, England from 2000  2002;
provided, however, that the Company will have no responsibility to so indemnify you if it is
determined that such tax liability was a result of your intentional misconduct, your improper
reporting, or your undue delay in providing necessary documents to the Company or its tax
advisors. You agree to promptly notify the Company in the event you are served with a levy,
audit notice, summons, subpoena or other legal process regarding any potential tax liability
for this time period.5.
    
    In consideration of the undertakings described herein, including the severance compensation
which Forrester has agreed to pay you hereunder, and to which you would not otherwise be
entitled, you, on behalf of yourself and your representatives, assigns, executors,
administrators, and heirs, hereby completely release and forever discharge Forrester Research,
Inc. and its subsidiaries, and all of their respective shareholders, officers, and all other
representatives, agents, directors, employees, employee benefit plans, successors, and
assigns, both individually and in their official capacities, from all claims, rights, demands,
actions, obligations, and causes of action, of every kind, nature, and character, known or
unknown, which you now have, may now have, or have ever had, against them arising from or in
any way connected with your employment relationship with Forrester Research, Inc., any actions
during the relationship, and/or the termination of such relationship. This release extends
to, without limitation, wrongful discharge claims; all claims relating to any contracts of
employment, express or implied; any claims related to defamation, privacy, misrepresentation,
or breach of the covenant of good faith and fair dealing, express or implied, and tort claims
of every nature; any claims under municipal, state, or federal statutes or ordinances; claimed
violations of fair employment practices, anti-discrimination, or civil rights laws (including
but not limited to all claims under Title VII of the Civil Rights Act of 1964, and any claims
of discrimination on the basis of race, sex, pregnancy, age, religion, national origin, sexual
orientation or sexual preference, handicap, disability, veteran status or any other protected
classification; claims under the Age Discrimination in Employment Act, as amended; claims
under the Family and Medical Leave Act, as amended, or any other federal or state law
concerning leaves of absence; claims under the Americans With Disabilities Act, as amended,
and any other laws and regulations relating to employment discrimination); claims under the
Worker Adjustment and Retraining Notification (WARN) Act; claims under the Employee
Retirement Income Security Act (other than claims against an employee benefit plan seeking
payment of a vested benefit under the terms of that plan); claims for wages, bonuses,
incentive compensation, stock payments, stock options, any form of equity participation, or
any other compensation or benefits;
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and claims for compensatory or punitive damages or attorneys fees. This release does not
apply to any vested stock options nor does it alter the terms of any stock option plans or
previously awarded grants under such plans.6.
    
    You agree that the terms of this letter agreement are confidential. All information relating
to the subject matter of this agreement, including the terms and amounts set forth herein,
have been and will be held confidential by you and not publicized or disclosed to any person
(other than an immediate family member, legal counsel, or financial advisor, provided that any
such individual to whom permissible disclosure is made agrees to be bound by these
confidentiality obligations), business entity, or government agency (except as mandated by
state or federal law). You also agree that you have not and will not disparage Forrester or
any of those connected with it. You represent that, as of the date of this letter agreement,
you have not breached the Employee Confidentiality, Proprietary Rights and Noncompetition
Agreement you entered into with Forrester, and you further agree to abide by such Agreement
going forward. Any breach of this letter agreement or the Employee Confidentiality,
Proprietary Rights and Noncompetition Agreement will be grounds for immediate termination
and/or disgorgement of any of the pay and benefits provided to you hereunder.7.
    
    Massachusetts law shall govern the validity and interpretation of this agreement.8.
    
    Any term or provision of this letter agreement that is determined to be invalid or
unenforceable by any court of competent jurisdiction shall, as to such jurisdiction, be
ineffective to the extent of such invalidity or unenforceability without rendering invalid or
unenforceable the remaining terms and provisions of this letter agreement or affecting the
validity or enforceability of any of the terms or provisions of this letter agreement in any
other jurisdiction; and any such invalid or unenforceable provision shall be modified by such
court so that it is enforceable to the greatest extent permitted by applicable law.9.
    
    This letter agreement constitutes the entire understanding of the parties with respect to
your employment, its termination, and all related matters, excepting only the Employee
Confidentiality, Proprietary Rights and Noncompetition Agreement that will remain in full
force and effect according to its terms. You and Forrester expressly warrant that each has
read and fully understands this agreement; that Forrester has advised you to consult with an
attorney before signing this agreement, and that you have had the opportunity to consult with
legal counsel of your own choosing and to have the terms of this agreement fully explained to
you; that you are not executing this agreement in reliance on any promises, representations,
or inducements other than those contained herein; and that you are executing this agreement
knowingly and voluntarily, and free of any duress or coercion. You may take up to twenty-one
(21) days from the date of your receipt of this letter agreement to decide to sign and return
this agreement to Forrester, provided that you may not sign this letter agreement until the
day following the Separation Date. The offer contained in this letter agreement will
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automatically become null and void if Forrester does not receive your signed acceptance in
this twenty-one (21) day time frame. Additionally, for a period of seven (7) days after
you sign this agreement, you may revoke your acceptance of this agreement by delivery of
written notice to Gail S. Mann, Chief Legal Officer, Forrester Research, Inc., 400
Technology Square, Cambridge, MA 02139. This agreement will not take effect until that
revocation period has expired, and provided you have not timely revoked your acceptance of
this agreement.10.
    
    This letter agreement, and the rights and obligations of the Company and you hereunder, shall
inure to the benefit of and shall be binding upon, you and your heirs and representatives.
   /s/ Elizabeth Lemons

Elizabeth Lemons 

Chief People Officer
  /s/ Julie Meringer

Julie Meringer
  5