Document:

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                                                                    Exhibit 10.2

CONFIDENTIAL

                                  July 30, 2001

Jupiter Media Metrix, Inc.
21 Astor Place
New York, New York 10003

Ladies and Gentlemen:

                I am pleased to offer to provide to Jupiter Media Metrix, Inc.
(the "Company") a $25,000,000 letter of credit (the "LOC") under the terms and
subject to the conditions described in the attached Terms and Conditions (the
"Terms and Conditions"). It is intended that the LOC will provide credit support
for the Company if it decides to obtain third party debt financing.

                My commitment to make this letter of credit available to the
Company is subject to the negotiation, execution and delivery of a definitive
letter of credit, in form and substance satisfactory to me.

                The Company agrees that this letter and the transactions
described in the Terms and Conditions are confidential, and it shall not
disclose any of the terms of such transactions to any other person or entity
("Person") without my prior written consent, except that the Company may
disclose this letter to the Company's employees, attorneys or accountants or as
may be required by law or any court or any regulatory body having jurisdiction
over it.

                Whether or not the transactions contemplated hereby are
consummated, the Company agrees (i) to pay on demand all my reasonable costs and
expenses and the fees and disbursements of my counsel incurred in connection
with this letter and the matters related thereto and the negotiation,
documentation and closing of the transactions contemplated hereby; and (ii) to
indemnify me, and my agents, counsel and other advisors against, and hold such
Persons harmless from, any and all losses, costs, damages (whether general,
punitive or otherwise), liabilities, indebtedness, claims, causes of action,
judgments, court costs and legal or other expenses, including fees and
disbursements of separate counsel selected by any such Person to represent any
such Person, which such Persons may suffer or incur in any way relating to or
arising out of the transactions contemplated hereby or the proposed use of the
proceeds of the transaction. The foregoing obligations of the Company shall
survive the termination of this letter as provided below or the consummation of
the transactions contemplated hereby, as the case may be. Should any amount
required to be paid pursuant to this paragraph not be paid on demand, interest
shall accrue thereon at ten percent (10%) per annum (360-day year, actual days
elapsed).

                This commitment letter shall be governed by and construed in
accordance with the laws of the State of New York.

                This commitment letter, together with the Terms and Conditions,
contains the entire and exclusive agreement of the parties with reference to the
matters discussed herein and

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therein and supersedes all prior drafts, communications, discussions and
understandings, oral or written, with respect thereto.

                This commitment is intended solely for the Company's benefit and
shall not be for the benefit of any other Person. The description of terms set
forth in the Terms and Conditions does not purport to, nor shall it be construed
as an attempt to, define all of the terms, conditions, covenants,
representations, warranties, events of default and other provisions usual and
customary in transactions of this type which may be contained in definitive
legal documentation for the transaction. Rather, it is intended only to outline
basic points of business understanding around which the legal documentation may
be structured.

                Please indicate the Company's acceptance of this commitment and
its agreement to the above provisions by causing this letter to be signed on
behalf of the Company in the place provided below and returning a copy of this
commitment letter so executed to me, whereupon this commitment letter shall
become a binding agreement between the Company and me subject to the terms and
conditions set forth herein and the Terms and Conditions. Even if this
commitment is accepted by the Company, such commitment shall expire upon the
earlier of (i) the close of business in New York, New York on July 31, 2002 or
(ii) a Change of Control (as defined in the Terms and Conditions), if a
definitive letter of credit satisfactory to me has not been executed prior to
such time.

                                        Very truly yours,

                                        /s/ Tod Johnson
                                        ----------------------------------
                                        Tod Johnson

Agreed and Accepted:
-------------------

JUPITER MEDIA METRIX, INC.

By  /s/ Robert Becker
    ---------------------------------
    Title: Chief Executive Officer

Date: July 30, 2001

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                           JUPITER MEDIA METRIX, INC.

                         PROPOSED TERMS AND CONDITIONS*

ISSUER:                         Morgan Guaranty Trust Company of New York

BENEFICIARY:                    Jupiter Media Metrix, Inc. (the "Company")

AMOUNT:                         $25,000,000

COMMITMENT EXPIRATION DATE:     The earlier of (i) July 31, 2002 or (ii) a sale,
                                merger or other business combination in one or a
                                series of transactions resulting in a third
                                party acquiring 50% or more of the Company's
                                voting stock or assets ("Change of Control").

TERM OF LETTER OF CREDIT:       The letter of credit will terminate upon the
                                earlier of (i) one year from the date of
                                issuance or (ii) a Change of Control.

PURPOSE OF LETTER OF CREDIT:    To provide credit support for borrowing from a
                                third party lender.

LOAN DOCUMENTS:                 Loan documents between the Company and an
                                institutional lender ("Loan Documents") shall be
                                subject to the approval of Mr. Johnson.

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

        *   These Proposed Terms and Conditions are subject to the provisions of
an accompanying letter agreement dated July 30, 2001.

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LETTER OF CREDIT FEES:          During the term of the letter of credit, the
                                Company will, on a quarterly basis in arrears,
                                either (i) pay to Mr. Johnson an amount in cash
                                equal to .25% of the amount of the letter of
                                credit or (ii) issue warrants to Mr. Johnson to
                                purchase 125,000 shares of Common Stock of the
                                Company. At each quarterly interval, the Company
                                may pay cash or issue warrants at its option.
                                The warrants would have an exercise price of
                                $.01 per share and a term of 5 years from the
                                date of issuance. The Warrants would also be
                                entitled to registration rights.

                                The Company shall pay all fees and expenses
                                incurred by Mr. Johnson in connection with the
                                letter of credit, including any issuance fees
                                and commission charges.

                                In the event of a drawdown on the Letter of
                                Credit, interest will accrue at the default
                                interest rate set forth in the Loan Documents.

REIMBURSEMENT:                  Mr. Johnson shall be reimbursed for all
                                reasonable costs and expenses incurred in
                                connection with this letter.

CONDITIONS PRECEDENT TO         Drawdowns may only occur upon the occurrence of
DRAWDOWNS:                      an Event of Default under the Loan Documents.

COLLATERAL:                     Mr. Johnson to receive an assignment of all
                                collateral held by the Lender in the event of a
                                drawdown of the letter of credit by the Lender.
                                The Loan Documents will provide that Mr. Johnson
                                be subrogated to the rights of the Lender upon
                                an event of default under the Loan Documents.

GOVERNING LAW:                  New York<PAGE>   1

                                                                    Exhibit 10.3

June 15, 2001

Mary Ann Packo
301 West 57th Street, #22-D
New York, NY 10019

        Re:     Severance Agreement

        This letter agreement sets forth the terms and conditions under which
you shall be entitled to a severance payment from Jupiter Media Metrix, Inc.
(the "Company"). Please sign your name at the end of this letter agreement,
which shall evidence your agreement to the terms and conditions contained
herein.

        In the event that the Company (or a successor entity) terminates your
employment without "Cause" (as defined below) at any time prior to June 15, 2003
or in the event that you terminate your employment for "Good Reason" (as defined
below) at any time prior to June 15, 2003, you shall be entitled to receive a
severance payment equal to twelve months of your base salary at the rate in
effect on the date of termination. The Company (or successor entity) shall pay
such severance amount, at its option, either (i) in a lump sum payment within 30
days following the termination of employment or (ii) over the twelve-month
severance period (or shorter period) in accordance with the Company's customary
pay practices and subject to all required withholding.

        Termination by you for "Good Reason" shall mean your resignation within
60 days of the any of the following events (the "Trigger Events"):

                (i)     a material reduction in your duties and
                        responsibilities;

                (ii)    a material reduction in your salary or bonus (except in
                        the event of a broad reduction affecting the salaries or
                        bonuses of all or most of the Company's (or successor
                        entity's) senior executives);

                (iii)   a change in your reporting relationship so that you no
                        longer report directly to the chief operating officer,
                        president or chief executive officer of the Company (or
                        successor entity); or

                (iv)    a relocation of your primary worksite to a location
                        outside New York City.

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        You agree to give the Company thirty days' written notice and
opportunity to cure prior to resigning for "Good Reason."

        "Cause" is defined as (i) your conviction of any felony or crime of
moral turpitude; (ii) gross negligence or willful misconduct by you in
connection with your position with the Company; or (iii) your willful and
material breach of your Confidentiality and Noncompetition Agreement.

        This letter agreement constitutes an integrated, written contract,
expressing the entire agreement between us with respect to the subject matter
hereof. In this regard, you agree that you are not relying on any promises or
representations which do not appear in this letter agreement. We further agree
that this letter agreement can be amended or modified only by a written
agreement, signed by each of us.

                                            JUPITER MEDIA METRIX, INC.

                                            By: /s/ Tod Johnson
                                                ------------------------------
                                                Name: Tod Johnson
                                                Title: Chief Executive Officer

Agreed to and acknowledged by:

 /s/ Mary Ann Packo
--------------------------
Mary Ann Packo

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