Document:

<PAGE>
                                                               EXHIBIT 10.10
                                 PROMISSORY NOTE

$1,478,832.38                                                    March 15, 2002
                                                               Atlanta, Georgia

         FOR VALUE RECEIVED, the undersigned, DAVID GOULD ("Borrower"), promises
to pay to the order of WITNESS SYSTEMS, INC., a Delaware corporation (the
"Lender"), in lawful money of the United States of America constituting legal
tender in payment of all debts and dues, public and private, the principal
amount of One Million Four Hundred Seventy Eight Thousand Eight Hundred Thirty
Two and 38/100 Dollars ($1,478,832.38).

         1.       INTEREST. From and after the date hereof (until maturity or
default as hereinafter provided), interest on the principal amount outstanding
shall accrue at an adjustable rate per annum equal to 325 basis points (3.25%)
in excess of the Federal Funds Rate (as hereinafter defined), and computed on
the basis of a 365-day year. The interest rate shall be adjusted monthly on the
first day of each calendar month hereafter upon any change in the Federal Funds
Rate to the appropriate percentage above the Federal Funds Rate most recently in
effect. "Federal Funds Rate" shall mean the rate per annum (rounded upwards, if
necessary, to the next 1/100th of 1%) equal to the weighted average of the rates
on overnight Federal funds transactions with member banks of the Federal Reserve
System arranged by Federal funds brokers, as published by the Federal Reserve
Bank of New York on the next succeeding business day.

         2.       PAYMENT.

                  (a)   Interest on the outstanding principal balance of the
                        indebtedness evidenced hereby shall be payable annually
                        with the initial payment due on or before February 1,
                        2003.

                  (b)   One third (1/3) of the principal balance of the
                        indebtedness evidenced hereby shall be due and payable
                        on or before each of the following dates:

                           (i)      February 1, 2003;
                           (ii)     February 1, 2004; and
                           (iii)    February 1, 2005.

                  (c)   On February 1, 2005 (the "Maturity Date"), the entire
                        outstanding principal balance of the indebtedness
                        evidenced hereby plus all accrued but unpaid interest
                        thereon shall be due and payable in full.

                  (d)   Notwithstanding anything herein to the contrary, the
                        entire outstanding principal balance of the
                        indebtedness evidenced hereby and all accrued but
                        unpaid interest shall be due and payable in full upon
                        the first to occur of the following:

                           (i)      The Maturity Date; or

                           (ii)     Ninety (90) days following the effective
                                    date of termination of Borrower's full time
                                    employment with the Lender, unless otherwise
                                    agreed to by Lender and Borrower.

<PAGE>
         3.       PREPAYMENT.

This Note may be prepaid in whole or in part without penalty, provided that any
partial prepayment shall be in integral multiples of $1,000.00.

         4.       SECURITY.

                  a.    Maintenance of Collateral. On the date hereof, Maker has
                        pledged to Lender, as collateral security, collateral of
                        a type described in the stock pledge agreement of even
                        date herewith, with a Collateral Value (as determined
                        herein) equal to at least 2.5 times the balance of this
                        Note. If at any time while this Note is outstanding, the
                        Collateral Value (as determined herein) of the
                        collateral shall be less than 1.5 times the unpaid
                        principal balance of this Note, Maker shall immediately
                        comply with Section 4b, below. The "Collateral Value" of
                        collateral shall be determined at any given time by
                        multiplying (i) the per share price of such stock at the
                        most recent close of trading on a trading exchange for
                        such stock (the "Market Value"), times (ii) the number
                        of shares of such stock held by Lender as collateral.
                        For all purposes the value of a share of Witness stock
                        shall be the Market Value.

                  b.    Breach of Collateral Maintenance. Maker agrees that the
                        failure to maintain collateral with a Collateral Value
                        as set forth above shall constitute an Event of Default
                        under this Note. In such event, the Maker shall, within
                        ten business days after the date Maker is notified by
                        Lender (in writing or orally) of such noncompliance,
                        either pledge additional collateral satisfactory to
                        Lender, in its sole discretion, or reduce the unpaid
                        principal balance of this Note such that, in either
                        case, the Collateral Value is then equal to at least 2.5
                        times the unpaid principal balance of this Note. Failure
                        to achieve the foregoing within ten business days after
                        the giving of notice by Lender as aforesaid shall be an
                        Event of Default under this Note. Notwithstanding the
                        foregoing terms of this Section 4.b., in the event that
                        during such ten business day period the Collateral Value
                        is equal to 1.1 or less times the principal balance of
                        the Note, then there shall immediately be an Event of
                        Default.

                  c.    Sale or Substitution of Collateral. If no Event of
                        Default has occurred under this Note or would result
                        from such action, Maker may sell, trade, or withdraw any
                        part of the collateral; provided that the Collateral
                        Value shall continue to equal at least 2.5 times the
                        unpaid principal balance of this Note.

         5.       DEFAULT.

                  a.    Event of Default. An event of default ("Event of
                        Default") shall occur (a) if Maker or any other obligor
                        on all or part of this Note shall fail to timely and
                        properly pay or observe, keep or perform any term,
                        covenant, agreement or condition in this Note or in any
                        other agreement between Maker and Lender or between
                        Lender and any other obligor on this Note.

                  b.    Rights and Remedies. If any Event of Default shall
                        occur, then, in each and every such case, Lender may,
                        without (a) presentment, demand, or protest, (b) notice
                        of default, dishonor, demand, non-payment, or protest,
                        (c) notice of intent to accelerate all or any part of
                        the obligation represented hereby, (d) notice of
                        acceleration of all or any part of the obligation
                        represented hereby, or (e) notice of any other kind, all
                        of which Maker hereby expressly waives (except for any
                        notice required under this Note,

<PAGE>

             any other loan document or which may not be waived under applicable
             law), at any time thereafter exercise and/or enforce any of the
             following rights and remedies, at Lender's option:

                  i.       Acceleration. The obligation represented hereby
                           shall, at Lender's option, become immediately due and
                           payable, and the obligation, if any, of Lender to
                           permit further borrowings shall at Lender's option
                           immediately cease and terminate.

                  ii.      Retirement of Collateral. Instruct any Agent or
                           Broker to release, all or any part of the collateral
                           to Lender, retire such collateral, and apply an
                           amount equal to the Market Value per share to the
                           payment of any or all of the obligation represented
                           hereby in such order and manner as Lender shall, in
                           its discretion, choose.

                  iii.     Uniform Commercial Code. All of the rights, powers
                           and remedies of a secured creditor under the Uniform
                           Commercial Code ("UCC") as adopted in the
                           jurisdiction to which Lender is subject under this
                           Agreement.

         Maker specifically understands and agrees that any sale by Lender of
all or part of the collateral pursuant to the terms of this Agreement may be
effected by Lender at times and in manners which could result in the proceeds of
such sale being significantly and materially less than might have been received
if such sale had occurred at different times or in different manners, and Maker
hereby releases Lender and its officers and representatives from and against any
and all obligations and liabilities arising out of or related to the timing or
manner of any such sale.

         If, in the opinion of Lender, there is any question that a public sale
or distribution of any collateral will violate any state or federal securities
law, Lender may offer and sell such Collateral in a transaction exempt from
registration under federal securities law, and any such sale made in good faith
by Lender shall be deemed "commercially reasonable."

         Notwithstanding anything to the contrary in this Note, the Maker shall
have the right, on and after the date which is six months plus one day after the
date of this Note, to meet Maker's collateral maintenance obligations under
Section 4 of this Note by directing Lender to recover and retire a number of
shares held under the pledge agreement, and apply the fair market value thereof
to reduce the balance due under this Note, such that the collateral maintenance
requirements of Section 4 hereof are thereby satisfied. If, prior to such date,
an Event of Default shall occur under this Note, the rate of interest payable on
the unpaid principal balance hereunder shall thereafter equal 18% per annum.

         6.       RECOURSE. Borrower shall be 100% personally liable for the
obligations evidenced hereby.

         7.       PAYMENT IN SHARES. Subsequent to the date which is six (6)
months after the date of this Note, Borrower may make any payment due and
payable or otherwise permitted hereunder by delivery of shares of Lender's
common stock owned by and fully vested in Borrower to Lender; provided, however,
that any such shares delivered as payment hereunder shall have been owned by,
vested in and fully paid for by Borrower for more than six (6) months prior to
the date such payment is made. For purposes of payments hereunder, any shares of
Lender's common stock shall be valued at their then fair market value

<PAGE>

(as determined by the closing market price on NASDAQ on the date of tender) for
application to the balance of the principal and all interest payments hereunder.

         8.       WAIVERS. Borrower hereby waives demand, presentment for
payment, notice of dishonor, protest, and notice of protest and diligence in
collection or bringing suit and agree that the holder hereof may accept partial
payment, or release or exchange security or collateral, without discharging or
releasing any unreleased collateral or the obligations evidenced hereby.
Borrower further waives any and all rights of exemption, both as to personal and
real property, under the constitution or laws of the United States or the State
of Georgia.

         9.       ATTORNEYS' FEES. Borrower agrees to pay reasonable attorneys'
fees and costs actually incurred by the holder hereof in collecting on this
Note, whether by suit or otherwise.

         10.      UNCONDITIONAL PAYMENT. Borrower is and shall be obligated to
pay principal and any and all other amounts which become payable hereunder
absolutely and unconditionally and without any abatement, postponement,
diminution or deduction and without any reduction for counterclaim or setoff. In
the event that at any time any payment received by Lender hereunder shall be
deemed by a court of competent jurisdiction to have been a voidable preference
or fraudulent conveyance under any bankruptcy, insolvency or other debtor relief
law, then the obligation to make such payment shall survive any cancellation or
satisfaction of this Note or return thereof to Borrower and shall not be
discharged or satisfied with any prior payment thereof or cancellation of this
Note, but shall remain a valid and binding obligation enforceable in accordance
with the terms and provisions hereof, and such payment shall be immediately due
and payable upon demand.

         11.      MISCELLANEOUS. As used herein, the terms "Borrower," "Lender"
and "holder" shall be deemed to include their respective successors, legal
representatives and assigns, whether by voluntary action of the parties or by
operation of law. This Note is given under the seal of the Borrower, and it is
intended that this Note is and shall constitute and have the effect of a sealed
instrument according to law. This Note has been negotiated, and is being
executed and delivered in the State of Georgia, or if executed elsewhere, shall
become effective upon the Lender's receipt and acceptance of the executed
original of this Note in the State of Georgia; provided, however, that the
Lender shall have no obligation to give, nor shall Borrower be entitled to
receive, any notice of such acceptance for this Note to become a binding
obligation of Borrower. Borrower hereby submits to jurisdiction in the State of
Georgia. This Note shall be governed by and be construed in accordance with the
laws of the State of Georgia. It is intended, and the Borrower and the holder
hereof specifically agree, that the laws of the State of Georgia governing
interest shall apply to this Note and to this transaction. This Note may not be
modified except by written agreement signed by the Borrower and the holder
hereof, or by their respective successors or assigns.

         12.      TIME OF ESSENCE.TIME IS OF THE ESSENCE in connection with this
Note.

         IN WITNESS WHEREOF, Borrower has caused this Note to be executed and
delivered under seal as of the date first set forth above.

LENDER:                                                       BORROWER:

/s/ Loren Wimpfheimer                              /s/ David Gould        [SEAL]
---------------------                              -----------------------
By: Loren Wimpfheimer, SVP                         David Gould
Witness Systems, Inc<PAGE>

                                                                  EXHIBIT 10.11

                                                                  March __, 2002

Witness Systems, Inc.
300 Colonial Center Parkway
Roswell, GA  30076-4899
Attn: Loren Wimpfheimer

David Gould
1880 Durand Mill Drive
Atlanta, GA 30307

                Re: David B. Gould Pledge Account No.:xxx

Dear Mr. Gould and Mr. Wimpfheimer:

        This letter will document the agreement reached between and among
Goldman, Sachs & Co. ("Goldman"), David Gould ("Pledgor"), and Witness Systems,
Inc. ("the Secured Party") with regard to the assets in the above-referenced
account ("Account") maintained with Goldman, which Account is owned by Pledgor.
Pledgor has pledged the assets in the Account, together with all additions
thereto and all substitutions and replacements thereof (the "Pledged Assets") to
the Secured Party in connection with a loan made by the Secured Party to
Pledgor.

        Goldman agrees that it will comply with all notifications relating to
redemption and transfer of the Pledged Assets ("Entitlement Order") originated
by the Secured Party in the form of Exhibit 1 and delivered to Goldman without
further consent of Pledgor. Without limiting the foregoing, prior to the receipt
by Goldman of a Notice of Exclusive Control (defined below) from the Secured
Party, as described below, Goldman may act on Entitlement Orders and other
instructions from the Pledgor to transact any and all investment activity in the
Account and to make transfers of securities or cash in connection with: (i)
sales or purchases of securities in the Account; and (ii) the payment of
Goldman's normal and customary commissions and fees in connection therewith.
Notwithstanding anything in this letter to the contrary, Pledgor shall not be
authorized to make "free transfers" (i.e., transfers of securities or cash other
than in connection with investment activity in the Account or in connection with
the payment of related commissions and fees) absent joint written instructions
from Pledgor and an authorized representative of the Secured Party; provided,
however, that Pledgor may withdraw and Goldman may release to Pledgor, all
interest and dividends paid or accrued on assets in the Account and such release
of interest and dividends shall not be regarded as a "free transfer". Goldman
makes no representations regarding the transferability of the Pledged Assets,
including, but not limited to, whether such assets are restricted in accordance
with Rule 144 or otherwise.
<PAGE>

        Pledgor hereby authorizes Goldman to provide, and Goldman undertakes to
provide, the Secured Party with copies of all monthly statements for the Account
and duplicate confirmations of all trading activity in the Account. In addition,
each of the parties hereby agrees that: i) upon receipt by Goldman of an
Entitlement Order substantially similar to Exhibit 1, and after it has had
reasonable opportunity to comply, such event shall be deemed to be an
instruction by Secured Party to liquidate securities in the Account and transfer
the proceeds to the Secured Party as described in such notice in the manner
stated in such notice; and ii) Goldman shall be authorized to act, and shall
act, in accordance with such instruction.

        Upon receipt by Goldman of a "Notice of Exclusive Control" in the form
substantially similar to Exhibit 2, and after it has had reasonable opportunity
to comply, Goldman will cease complying with Entitlement Orders or other
instructions concerning the Account originated by Pledgor or its representatives
and cease distributing interest or dividends on property in the Account to
Pledgor. Each Entitlement Order and Notice of Exclusive Control originated by
the Secured Party shall be signed by the Secured Party, and such signature is to
have been duly acknowledged before a notary public. Goldman shall be entitled to
rely upon any Entitlement Order or Notice of Exclusive Control or other
instructions referred to herein that it reasonably believes to be from the
appropriate party. Notice to Goldman shall be provided by delivery of such
notice to General Counsel, Goldman, Sachs & Co., 1 New York Plaza, New York,
N.Y., 10004, with a copy to the Director, Wealth Management Operations, One
Hanover Plaza, New York, N.Y., 10005.

        The undertakings of Goldman as set forth herein are specifically
conditioned upon the Secured Party's agreement, as indicated by its signature
below, that the security interests maintained by Goldman are, and shall remain,
senior to and shall have priority over, the junior security interests asserted
by the Secured Party such that all of the obligations of Pledgor to Goldman and
its affiliates, whether arising out of the Account or out of any other account
or agreement, must be satisfied in full prior to the satisfaction of any
obligation of Pledgor to the Secured Party.

        Please be advised however, that, except as specifically provided in this
letter, Goldman does not, and will not, undertake, and hereby specifically
disavows, any obligation to the Secured Party, or any third party with respect
to the Account, or any related agreement or undertaking between Pledgor and the
Secured Party. Without in any way limiting the foregoing disclaimer: (i) Goldman
shall have no obligation to monitor the activity in the Account nor shall
Goldman have any responsibility whatsoever for the performance or observance by
Pledgor of any loan, guarantee or other agreement(s) with the Secured Party and;
(ii) except with regard to the transfer or redemption instructions contained in
an Entitlement Order

                                       2
<PAGE>

originated by the Secured Party or the liquidation and transfer instructions
contained in the Notice of Exclusive Control referred to above, Goldman shall
accept instructions with regard to the Account only from Pledgor, regardless of
any notice, demand or other communication received from the Secured Party or any
third party with regard to the Account. Goldman's records do not reflect any
pledge or security interest with respect to the Pledged Assets in favor of any
party other than as stated herein.

        Pledgor agrees to indemnify and hold Goldman, its affiliates, and its
and their partners, employees, agents, officers and directors, harmless from any
claim, loss, liability or expense, including attorney's fees and the costs of
instituting or defending any proceedings relating thereto, arising out of or
relating to the Account, this agreement, and any actions Goldman may take or not
take pursuant to this agreement, provided that such actions or inactions are not
the result of the gross negligence or willful misconduct of Goldman, its agents
or its employees. The Secured Party agrees to indemnify and hold Goldman, its
affiliates, and its and their partners, employees, agents, officers and
directors, harmless from any claim, loss, liability or expense, including
attorney's fees and the costs of instituting or defending any proceedings
relating thereto, arising out of or relating to, actions taken by Goldman in
response to an Entitlement Order or Notice of Exclusive Control issued by the
Secured Party, provided that such actions or inactions are not the result of the
gross negligence or willful misconduct of Goldman, its agents or its employees.
The foregoing indemnification shall survive the termination of this agreement
and the Account.

        The obligations of Goldman set forth above shall continue in effect
until the earlier of (a) the notification by the Secured Party to Goldman of
such termination in writing; (b) the unilateral termination of this agreement by
Goldman, such termination to be effective thirty (30) business days' after
written notice thereof is given to Pledgor and the Secured Party; or (c) the
transfer of the assets in the Account as directed by the Secured Party following
its origination of an Entitlement Order or its presentation of a Notice of
Exclusive Control. Upon the occurrence of any such event, the obligations of
Goldman set forth above with respect to the operation and maintenance of the
Account shall terminate.

                                       3
<PAGE>

        This agreement: (i) shall be binding on and shall inure to be benefit of
the successors and assigns of the parties hereto; (ii) may not be amended except
by a written instrument signed by all the parties hereto; (iii) the
establishment and maintenance of the Account, and all interests, duties and
obligations with respect to the Account, shall be governed by the law of the
State of New York; and (iv) supplements the account agreement executed by
Pledgor with regard to the Account.

        This agreement may be executed in any number of counterparts, each of
which shall be an original, but all of which shall together constitute one and
the same agreement.

                                               Sincerely,

                                               GOLDMAN, SACHS & CO.,
                                               a New York limited partnership

                                               By:     _________________________
                                                       Name:
                                                       Title:

Acknowledged and Agreed:

David Gould

By: _________________________
Name: David Gould
Title:
-----------------------------

Witness Systems, Inc.

By: ___________________________
Name: Loren Wimpfheimer
Title:

                                       4
<PAGE>

Exhibit 1

                                ENTITLEMENT ORDER

         This Entitlement Order is being sent pursuant to the letter dated March
22, 2002 between and among Goldman, Sachs & Co. ("Goldman"), David Gould
("Pledgor"), and Witness Systems, Inc. ("the Secured Party") with regard to
Account No. 003-025665 (the "Account") maintained by Pledgor at Goldman.

         Pursuant to the above-referenced agreement, Goldman is hereby
instructed as follows: [PICK ONE]

_____ Goldman shall [transfer all assets in the Account][redeem all assets in
the Account eligible for redemption and transfer the proceeds of such
redemption] to the account indicated below.

                                      [OR:]

_____ Goldman shall transfer the following assets in the Account to the account
indicated below: [LIST ASSETS]

         Any assets or proceeds transferred to the Secured Party are to be wired
by Goldman to the following account:

        [wiring instructions]

For Secured Party

Name and Title

                                       5
<PAGE>

Exhibit 2
                           NOTICE OF EXCLUSIVE CONTROL

         This Notice of Exclusive Control is being sent pursuant to the letter
dated March 22, 2002 between and among Goldman, Sachs & Co. ("Goldman"), David
Gould ("Pledgor"), and Witness Systems, Inc. ("the Secured Party") with regard
to Account No. xxx (the "Account") maintained by Pledgor at Goldman.

         Pursuant to the above-referenced agreement, Goldman is hereby
instructed as follows:

_____ (a) Goldman shall freeze all assets and activity in the Account pending
further written instructions from the Secured Party.

_____ (b) Goldman shall liquidate assets in the Account which are needed to
yield $_________ in proceeds, and transfer such proceeds to the Secured Party.
If the assets contained in the Account have a liquidation value exceeding
$__________, Goldman shall have the sole discretion to determine which assets
are liquidated. If the liquidation of all assets in the Account shall yield less
than $___________, Goldman shall liquidate all assets and transfer all proceeds
to the Secured Party.

        Any proceeds transferred to the Secured Party are to be wired by Goldman
to the following account:

        [wiring instructions]

For Secured Party

------------------------
Name and Title

                                       6
<PAGE>

ADDENDUM TO THE PLEDGE AGREEMENT AMONG GOLDMAN SACHS & CO., WITNESS SYSTEM AND
DAVID GOULD.

The parties hereto agree that the Pledge Agreement dated March __, 2002 to which
this Addendum is annexed, is hereby modified as follows:

         1.       Paragraph 2, lines 3-9 the words "Without limiting the
                  foregoing, prior to the receipt by Goldman of a Notice of
                  Exclusive Control (defined below) from the Bank, as described
                  below, Goldman may act on Entitlement Orders and other
                  instructions from the Pledgor to transact any and all
                  investment activity in the Account and to make transfers of
                  securities or cash in connection with: (i) sales or purchases
                  of securities in the Account; and (ii) the payment of
                  Goldman's normal and customary commissions and fees in
                  connection therewith." should be deleted and replaced with
                  "Without limiting the foregoing, prior to the receipt by
                  Goldman of a Notice of Exclusive Control (defined below) from
                  the Secured Party, as described below, Goldman may not act on
                  Entitlement Orders and other instructions from the Pledgor to
                  transact any and all investment activity in the Account and to
                  make transfers of securities or cash in connection with: (i)
                  sales or purchases of securities in the Account; and (ii) the
                  payment of Goldman's normal and customary commissions and fees
                  in connection therewith, absent joint written instructions
                  from Pledgor and an authorized representative at Witness
                  Systems."

         2.       The words "provided, however, that Pledgor may withdraw and
                  Goldman may release to Pledgor, all interest and dividends
                  paid or accrued on assets in the Account and such release of
                  interest and dividends shall not be regarded as a "free
                  transfer"." should be deleted from paragraph 2, line 13,14 &
                  15.

         3.       Paragraph 5, beginning with the words "The undertakings"
                  should be deleted and replace with ""The undertakings of
                  Goldman as set forth herein are specifically conditioned upon
                  the Secured Party's agreement, as indicated by its signature
                  below, that the security interests with regard to the Account
                  maintained by Goldman are, and shall remain, senior to and
                  shall have priority over, the junior security interests
                  asserted by the Secured Party and the Account solely with
                  respect to payment of (i) customary fees and commissions
                  related to the Assets, and (ii) financial assets duly
                  purchased for the Account in accordance with the provisions
                  hereof ("Reserved Rights"). Except for the Reserved Rights,
                  the Secured Party's security interests in the Account shall
                  have a priority over those of Goldman. Goldman shall not
                  advance margin or other credit against the Account nor
                  hypothecate the assets in the Account without the Secured
                  Party's prior written consent."

<PAGE>

         4.       The words "The Secured Party acknowledges that if it is the
                  issuer of a class of securities registered pursuant to Section
                  12 of the Securities Exchange Act of 1934, as amended, it may
                  have public disclosure requirements under U.S. federal
                  securities laws with respect to the pledge agreement and
                  transactions relating thereto, and agrees and covenants that
                  it will comply with all such disclosure requirements. The
                  Secured Party also represents and warrants that the pledge
                  agreement and any transactions relating thereto do not violate
                  or conflict with any law applicable to it, any provision of
                  its constitutional documents, any order or judgment of any
                  court or other agency of government applicable to it or any
                  contractual restriction binding on it or affecting it or any
                  of its assets." should be after the word "herein", paragraph
                  6, line 13.

         Except as modified hereby, all of the provisions of the Pledge
         Agreement are ratified and confirmed Witness Systems, David Gould and
         Goldman Sachs.

     On behalf of:

     GOLDMAN SACHS & CO.

        By: ___________________

     On behalf of Witness Systems:

     WITNESS SYSTEMS

    By: ___________________

     Acknowledged and agreed to by:

     -----------------------
     DAVID GOULD

                                       2

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