Document:

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                                                                    Exhibit 10.3

                                 TERADYNE, INC.

                        1996 EMPLOYEE STOCK PURCHASE PLAN

                         (as amended as of May 23, 2002)

Article 1 - Purpose.

     This 1996 Employee Stock Purchase Plan (the "Plan") is intended to
encourage stock ownership by all eligible employees of Teradyne, Inc. (the
"Company"), a Massachusetts corporation, and its participating subsidiaries
(as defined in Article 17) so that they may share in the growth of the Company
by acquiring or increasing their proprietary interest in the Company. The Plan
is designed to encourage eligible employees to remain in the employ of the
Company and its participating subsidiaries. The Plan is intended to constitute
an "employee stock purchase plan" within the meaning of Section 423(b) of the
Internal Revenue Code of 1986, as amended (the "Code").

Article 2 - Administration of the Plan.

     The Plan may be administered by a committee appointed by the Board of
Directors of the Company (the "Committee"). The Committee shall consist of not
less than two members of the Company's Board of Directors. The Board of
Directors may from time to time remove members from, or add members to, the
Committee. Vacancies on the Committee, howsoever caused, shall be filled by the
Board of Directors. The Committee may select one of its members as Chairman, and
shall hold meetings at such times and places as it may determine. Acts by a
majority of the Committee, or acts reduced to or approved in writing by a
majority of the members of the Committee, shall be the valid acts of the
Committee.

     The interpretation and construction by the Committee of any provisions of
the Plan or of any option granted under it shall be final, unless otherwise
determined by the Board of Directors. The Committee may from time to time adopt
such rules and regulations for carrying out the Plan as it may deem best,
provided that any such rules and regulations shall be applied on a uniform basis
to all employees under the Plan. No member of the Board of Directors or the
Committee shall be liable for any action or determination made in good faith
with respect to the Plan or any option granted under it.

     In the event the Board of Directors fails to appoint or refrains from
appointing a Committee, the Board of Directors shall have all power and
authority to administer the Plan. In such event, the word "Committee" wherever
used herein shall be deemed to mean the Board of Directors.

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Article 3 - Eligible Employees.

     No option may be granted to any person serving as a member of the Committee
at the time of grant. Subject to the foregoing limitation, all employees of the
Company or any of its participating subsidiaries on United States payroll who
are employees of the Company or any of its participating subsidiaries (i) on or
before the first day of any Payment Period (as defined in Article 5) or (ii) for
employees first employed after the first day of a particular Payment Period, on
or before the first day of the next succeeding July in any such Payment Period,
and whose customary employment is not less than twenty hours per week and more
than five months in any calendar year shall be eligible to receive options under
the Plan to purchase common stock of the Company, par value $.125 per share
("Common Stock"). An employee eligible under this Plan solely by virtue of
clause (ii) of the preceding sentence shall be referred to herein as a "July
Employee." All eligible employees shall have the same rights and privileges
hereunder. Persons who elect to enter the Plan in accordance with Article 7 and
who are eligible employees on the first business day of any Payment Period (as
defined in Article 5) (or on the first business day of July with respect to July
Employees) shall receive their options as of such day. Persons who elect to
enter the Plan in accordance with Article 7 and who become eligible employees
after any date on which options are granted under the Plan shall be granted
options on the first business day of the next succeeding Payment Period or the
first business day of July (whichever is applicable) on which options are
granted to eligible employees under the Plan. In no event, however, may an
employee be granted an option if such employee, immediately after the option was
granted, would be treated as owning stock possessing five percent or more of the
total combined voting power or value of all classes of stock of the Company or
of any parent corporation or subsidiary corporation, as the terms "parent
corporation" and "subsidiary corporation" are defined in Section 424(e) and
(f) of the Code. For purposes of determining stock ownership under this
paragraph, the rules of Section 424(d) of the Code shall apply, and stock which
the employee may purchase under outstanding options shall be treated as stock
owned by the employee.

Article 4 - Stock Subject to the Plan.

     The stock subject to the options under the Plan shall be authorized but
unissued Common Stock, or shares of Common Stock reacquired by the Company,
including shares purchased in the open market. The aggregate number of shares
which may be issued pursuant to the Plan is 10,400,000, subject to adjustment as
provided in Article 12. If any option granted under the Plan shall expire or
terminate for any reason without having been exercised in full or shall cease
for any reason to be exercisable in whole or in part, the unpurchased shares
subject thereto shall again be available under the Plan.

Article 5 - Payment Period and Stock Options.

     For the duration of the Plan, the Payment Period shall be defined as the
twelve-month period commencing on the first day of January and ending annually
on the last day of December of each calendar year. Notwithstanding the
foregoing, the first Payment

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Period during which payroll deductions will be accumulated under the Plan shall
commence on July 1, 1996 and shall end on December 31, 1996.

     On the first business day of each Payment Period (or on the first business
day of July of such Payment Period in the case of a July Employee), the Company
will grant to each eligible employee who is then a participant in the Plan an
option to purchase on the last day of such Payment Period, at the Option Price
hereinafter provided for, a maximum of 6,000 shares, on condition that such
employee remains eligible to participate in the Plan throughout the remainder of
such Payment Period. The participant shall be entitled to exercise the option so
granted only to the extent of the participant's accumulated payroll deductions
on the last day of such Payment Period. If the participant's accumulated payroll
deductions on the last day of the Payment Period would enable the participant to
purchase more than 6,000 shares except for the 6,000 share limitation, the
excess of the amount of the accumulated payroll deductions over the aggregate
purchase price of the 6,000 shares shall be promptly refunded to the participant
by the Company, without interest. The Option Price per share for each Payment
Period shall be the lesser of (i) 85% of the fair market value of the Common
Stock on the first business day of the Payment Period (or, in the case of a July
Employee, on the first business day of July of such Payment Period) and (ii) 85%
of the fair market value of the Common Stock on the last business day of the
Payment Period, in either event rounded up to the nearest cent. The foregoing
limitation on the number of shares subject to option and the Option Price shall
be subject to adjustment as provided in Article 12.

     For purposes of the Plan, the term "fair market value" on any date means
(i) the average (on that date) of the high and low prices of the Common Stock on
the principal national securities exchange on which the Common Stock is traded,
if the Common Stock is then traded on a national securities exchange; or
(ii) the last reported sale price (on that date) of the Common Stock on The
Nasdaq Stock Market, if the Common Stock is not then traded on a national
securities exchange; or (iii) the average of the closing bid and asked prices
last quoted (on that date) by an established quotation service for
over-the-counter securities, if the Common Stock is not reported on The Nasdaq
Stock Market; or (iv) if the Common Stock is not publicly traded, the fair
market value of the Common Stock as determined by the Committee after taking
into consideration all factors which it deems appropriate, including, without
limitation, recent sale and offer prices of the Common Stock in private
transactions negotiated at arm's length.

     For purposes of the Plan, the term "business day" means a day on which
there is trading on The Nasdaq Stock Market or the aforementioned national
securities exchange, whichever is applicable pursuant to the preceding
paragraph; and if neither is applicable, a day that is not a Saturday, Sunday or
legal holiday in Massachusetts.

     Notwithstanding any other provision herein, no employee shall be granted an
option which permits the employee's right to purchase stock under the Plan, and
under all other Section 423(b) employee stock purchase plans of the Company and
any parent or subsidiary corporations, to accrue at a rate which exceeds $25,000
of fair market value of

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such stock (determined on the date or dates that options on such stock were
granted) for each calendar year in which such option is outstanding at any time.
The purpose of the limitation in the preceding sentence is to comply with
Section 423(b)(8) of the Code. If the participant's accumulated payroll
deductions on the last day of the Payment Period would otherwise enable the
participant to purchase Common Stock in excess of the Section 423(b)(8) $25,000
limitation described in this paragraph, the excess of the amount of the
accumulated payroll deductions over the aggregate purchase price of the shares
actually purchased shall be promptly refunded to the participant by the Company,
without interest.

Article 6 - Exercise of Option.

     Each eligible employee who continues to be a participant in the Plan on the
last day of a Payment Period shall be deemed to have exercised his or her option
on such date and shall be deemed to have purchased from the Company such number
of full shares of Common Stock reserved for the purpose of the Plan as the
participant's accumulated payroll deductions on such date will pay for at the
Option Price, subject to the 6,000 share limit of the option and the Section
423(b)(8) $25,000 limitation described in Article 5. If the individual is not a
participant on the last day of a Payment Period, then he or she shall not be
entitled to exercise his or her option. Only full shares of Common Stock may be
purchased under the Plan. Unused payroll deductions remaining in a participant's
account at the end of a Payment Period solely by reason of the inability to
purchase a fractional share (and for no other reason) shall be refunded.

Article 7 - Authorization for Entering the Plan.

     An employee may elect to enter the Plan by filling out, signing and
delivering to the Company an authorization:

          A. Stating the percentage to be deducted from the employee's pay;

          B. Authorizing the purchase of stock for the employee in each Payment
     Period in accordance with the terms of the Plan; and

          C. Specifying the exact name or names in which stock purchased for the
     employee is to be issued as provided under Article 11 hereof.

     Such authorization must be received by the Company on or before the first
day of the next succeeding Payment Period or on or prior to the first day of
July of such Payment Period in the case of a July Employee.

     Unless a participant files a new authorization or withdraws from the Plan,
the deductions and purchases under the authorization the participant has on file
under the Plan will continue from one Payment Period to succeeding Payment
Periods as long as the Plan remains in effect.

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                                       -5-

     The Company will accumulate and hold for each participant's account the
amounts deducted from his or her pay. No interest will be paid on these amounts.

Article 8 - Maximum Amount of Payroll Deductions.

     An employee may authorize payroll deductions in an amount (expressed as a
whole percentage) not less than two percent (2%) but not more than ten percent
(10%) of the employee's cash compensation.

Article 9 - Change in Payroll Deductions.

     Deductions may not be increased during a Payment Period. Deductions may be
decreased during a Payment Period, provided that an employee may not decrease
his deduction more often than twice during any Payment Period (and with respect
to July Employees once during any Payment Period).

Article 10 - Withdrawal from the Plan.

     A participant may withdraw from the Plan (in whole but not in part) at any
time prior to the last day of a Payment Period by delivering a withdrawal notice
to the Company.

     To re-enter the Plan, an employee who has previously withdrawn must file a
new authorization on or before the first day of the next Payment Period in which
he or she wishes to participate. The employee's re-entry into the Plan becomes
effective at the beginning of such Payment Period, provided that he or she is an
eligible employee on the first business day of the Payment Period.

Article 11 - Issuance of Stock.

     Certificates for stock issued to participants shall be delivered as soon as
practicable after each Payment Period by the Company's transfer agent.

     Stock purchased under the Plan shall be issued only in the name of the
participant, or if the participant's authorization so specifies, in the name of
the participant and another person of legal age as joint tenants with rights of
survivorship.

Article 12 - Adjustments.

     Upon the happening of any of the following described events, a
participant's rights under options granted under the Plan shall be adjusted as
hereinafter provided:

          A. In the event that the shares of Common Stock shall be subdivided or
     combined into a greater or smaller number of shares or if, upon a
     reorganization,

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     split-up, liquidation, recapitalization or the like of the Company, the
     shares of Common Stock shall be exchanged for other securities of the
     Company, each participant shall be entitled, subject to the conditions
     herein stated, to purchase such number of shares of Common Stock or amount
     of other securities of the Company as were exchangeable for the number of
     shares of Common Stock that such participant would have been entitled to
     purchase except for such action, and appropriate adjustments shall be made
     in the purchase price per share to reflect such subdivision, combination or
     exchange; and

         B. In the event the Company shall issue any of its shares as a stock
     dividend upon or with respect to the shares of stock of the class which
     shall at the time be subject to options hereunder, each participant upon
     exercising such an option shall be entitled to receive (for the purchase
     price paid upon such exercise) the shares as to which the participant is
     exercising his or her option and, in addition thereto (at no additional
     cost), such number of shares of the class or classes in which such stock
     dividend or dividends were declared or paid, and such amount of cash in
     lieu of fractional shares, as is equal to the number of shares thereof and
     the amount of cash in lieu of fractional shares, respectively, which the
     participant would have received if the participant had been the holder of
     the shares as to which the participant is exercising his or her option at
     all times between the date of the granting of such option and the date of
     its exercise.

     Upon the happening of any of the foregoing events, the class and aggregate
number of shares set forth in Article 4 hereof which are subject to options
which have been or may be granted under the Plan and the limitations set forth
in the second paragraph of Article 5 shall also be appropriately adjusted to
reflect the events specified in paragraphs A and B above. Notwithstanding the
foregoing, any adjustments made pursuant to paragraphs A or B shall be made only
after the Committee, based on advice of counsel for the Company, determines
whether such adjustments would constitute a "modification" (as that term is
defined in Section 424 of the Code). If the Committee determines that such
adjustments would constitute a modification, it may refrain from making such
adjustments.

     If the Company is to be consolidated with or acquired by another entity in
a merger, a sale of all or substantially all of the Company's assets or
otherwise (an "Acquisition"), the Committee or the board of directors of any
entity assuming the obligations of the Company hereunder (the "Successor Board")
shall, with respect to options then outstanding under the Plan, either (i) make
appropriate provision for the continuation of such options by arranging for the
substitution on an equitable basis for the shares then subject to such options
either (a) the consideration payable with respect to the outstanding shares of
the Common Stock in connection with the Acquisition, (b) shares of stock of the
successor corporation, or a parent or subsidiary of such corporation, or
(c) such other securities as the Successor Board deems appropriate, the fair
market value of which shall not exceed the fair market value of the shares of
Common Stock subject to such options immediately preceding the Acquisition; or
(ii) terminate each participant's

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                                       -7-

options in exchange for a cash payment equal to the excess of the fair market
value on the date of the Acquisition of the number of shares of Common Stock
that the participant's accumulated payroll deductions as of the date of the
Acquisition could purchase, at an option price determined with reference only to
the first business day of the applicable Payment Period (or the first business
day of July of such Payment Period in the case of a July Employee) and subject
to the 6,000 share limit, Code Section 423(b)(8) and fractional-share
limitations on the amount of stock a participant would be entitled to purchase
over the aggregate option price to such participant thereof.

     The Committee or Successor Board shall determine the adjustments to be made
under this Article 12, and its determination shall be conclusive.

Article 13 - No Transfer or Assignment of Employee's Rights.

     An option granted under the Plan may not be transferred or assigned,
otherwise than by will or by the laws of descent and distribution. Any option
granted under the Plan may be exercised, during the participant's lifetime, only
by the participant.

Article 14 - Termination of Employee's Rights.

     Whenever a participant ceases to be an eligible employee because of
retirement, voluntary or involuntary termination, resignation, layoff,
discharge, death or for any other reason, his or her rights under the Plan shall
immediately terminate, and the Company shall promptly refund, without interest,
the entire balance of his or her payroll deduction account under the Plan;
provided, however, that if an employee is laid off during the last three months
of any Payment Period, he shall nevertheless be deemed to be a participant in
the Plan on the last day of the Payment Period. Notwithstanding the foregoing,
eligible employment shall be treated as continuing intact while a participant is
on military leave, sick leave or other bona fide leave of absence, for up to
90 days, or, if such leave is longer than 90 days, for so long as the
participant's right to re-employment is guaranteed either by statute or by
written contract. Notwithstanding any other provision herein, if a participant's
employment is terminated by reason of retirement, and the date of such
termination occurs after the date that is 3 months prior to the last day of the
Payment Period, such participant's rights under the Plan are not immediately
terminated, and if the participant has not withdrawn from the Plan, such
participant's options shall be deemed to have been exercised on the last day of
the Payment Period in accordance with the terms of the Plan.

Article 15 - Termination and Amendments to Plan.

     The Plan may be terminated at any time by the Company's Board of Directors
but such termination shall not affect options then outstanding under the Plan.
If at any time shares of stock reserved for the purpose of the Plan remain
available for purchase but not in sufficient number to satisfy all then unfilled
purchase requirements, the available shares shall be apportioned among
participants in proportion to the amount of payroll

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deductions accumulated on behalf of each participant that would otherwise be
used to purchase stock, and the Plan shall terminate. Upon such termination or
any other termination of the Plan, all payroll deductions not used to purchase
stock will be refunded, without interest.

     The Committee or the Board of Directors may from time to time adopt
amendments to the Plan provided that, without the approval of the shareholders
of the Company, no amendment may (i) increase the number of shares that may be
issued under the Plan; (ii) change the class of employees eligible to receive
options under the Plan, if such action would be treated as the adoption of a new
plan for purposes of Code Section 423(b) and the regulations thereunder; or
(iii) cause Rule 16b-3 under the Securities Exchange Act of 1934 to become
inapplicable to the Plan.

Article 16 - Limits on Sale of Stock Purchased under the Plan.

     The Plan is intended to provide shares of Common Stock for investment and
not for resale. The Company does not, however, intend to restrict or influence
any employee in the conduct of his or her own affairs. An employee may,
therefore, sell stock purchased under the Plan at any time the employee chooses,
subject to compliance with any applicable federal or state securities laws and
subject to any restrictions imposed under Article 21 to ensure that tax
withholding obligations are satisfied. THE EMPLOYEE ASSUMES THE RISK OF ANY
MARKET FLUCTUATIONS IN THE PRICE OF THE STOCK.

Article 17 - Participating Subsidiaries.

     The term "participating subsidiary" shall mean any present or future
subsidiary of the Company, as that term is defined in Section 424(f) of the
Code, that is designated from time to time by the Board of Directors to
participate in the Plan. The Board of Directors shall have the power to make
such designation before or after the Plan is approved by the shareholders.

Article 18 - Optionees Not Shareholders.

     Neither the granting of an option to an employee nor the deductions from
his or her pay shall constitute such employee a stockholder of the shares
covered by an option until such shares have been actually purchased by the
employee.

Article 19 - Application of Funds.

     The proceeds received by the Company from the sale of Common Stock pursuant
to options granted under the Plan will be used for general corporate purposes.

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                                       -9-

Article 20 - Notice to Company of Disqualifying Disposition.

     By electing to participate in the Plan, each participant agrees to notify
the Company in writing immediately after the participant transfers Common Stock
acquired under the Plan, if such transfer occurs within two years after the
first business day of the Payment Period in which such Common Stock was
acquired. Each participant further agrees to provide any information about such
a transfer as may be requested by the Company or any subsidiary corporation in
order to assist it in complying with the tax laws. Such dispositions generally
are treated as "disqualifying dispositions" under Sections 421 and 424 of the
Code, which have certain tax consequences to participants and to the Company and
its participating subsidiaries.

Article 21 - Withholding of Additional Income Taxes.

     By electing to participate in the Plan, each participant acknowledges that
the Company and its participating subsidiaries are required to withhold taxes
with respect to the amounts deducted from the participant's compensation and
accumulated for the benefit of the participant under the Plan, and each
participant agrees that the Company and its participating subsidiaries may
deduct additional amounts from the participant's compensation, when amounts are
added to the participant's account, used to purchase Common Stock or refunded,
in order to satisfy such withholding obligations. Each participant further
acknowledges that when Common Stock is purchased under the Plan the Company and
its participating subsidiaries may be required to withhold taxes with respect to
all or a portion of the difference between the fair market value of the Common
Stock purchased and its purchase price, and each participant agrees that such
taxes may be withheld from compensation otherwise payable to such participant.
It is intended that tax withholding will be accomplished in such a manner that
the full amount of payroll deductions elected by the participant under Article 7
will be used to purchase Common Stock. However, if amounts sufficient to satisfy
applicable tax withholding obligations have not been withheld from compensation
otherwise payable to any participant, then, notwithstanding any other provision
of the Plan, the Company may withhold such taxes from the participant's
accumulated payroll deductions and apply the net amount to the purchase of
Common Stock, unless the participant pays to the Company, prior to the exercise
date, an amount sufficient to satisfy such withholding obligations. Each
participant further acknowledges that the Company and its participating
subsidiaries may be required to withhold taxes in connection with the
disposition of stock acquired under the Plan and agrees that the Company or any
participating subsidiary may take whatever action it considers appropriate to
satisfy such withholding requirements, including deducting from compensation
otherwise payable to such participant an amount sufficient to satisfy such
withholding requirements or conditioning any disposition of Common Stock by the
participant upon the payment to the Company or such subsidiary of an amount
sufficient to satisfy such withholding requirements.

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                                       -10-

Article 22 - Governmental Regulations.

     The Company's obligation to sell and deliver shares of Common Stock under
the Plan is subject to the approval of any governmental authority required in
connection with the authorization, issuance or sale of such shares.

     Government regulations may impose reporting or other obligations on the
Company with respect to the Plan. For example, the Company may be required to
identify shares of Common Stock issued under the Plan on its stock ownership
records and send tax information statements to employees and former employees
who transfer title to such shares.

Article 23 - Governing Law.

     The validity and construction of the Plan shall be governed by the laws of
Massachusetts, without giving effect to the principles of conflicts of law
thereof.

Article 24 - Approval of Board of Directors and Stockholders of the Company.

     The Plan was adopted by the Board of Directors on March 19, 1996 and on
such date the Board of Directors resolved that the Plan was to be submitted to
the shareholders of the Company for approval at the next meeting of
shareholders. If the Plan does not receive such approval, all payroll deductions
shall be returned without interest and the Plan shall be terminated.<PAGE>

                                                                   EXHIBIT 10(i)

                                 AMENDMENT NO. 6
                                       TO
                         AMERICAN DENTAL PARTNERS, INC.
                   AMENDED AND RESTATED 1996 STOCK OPTION PLAN

         The American Dental Partners, Inc. Amended and Restated 1996 Stock
Option Plan, as previously amended (the "Plan"), is hereby amended pursuant to
the following provisions:

         1.       Definitions

         All capitalized terms used in this amendment which are not otherwise
defined herein shall have the respective meanings given such terms in the Plan.

         2.       Shares Subject To Plan

         The total number of shares of Common Stock for which options may be
granted under the Plan, as provided under Section 2(a) of the Plan, as
previously adjusted and increased, is increased by 300,000 shares to a total of
1,573,246 shares of Common Stock.

         3.       Effective Date; Construction

         The effective date of this amendment is May 3, 2002, and this amendment
shall be deemed to be a part of the Plan as of such date. In the event of any
inconsistencies between the provisions of the Plan and this amendment, the
provisions of this amendment shall control. Except as modified by this
amendment, the Plan shall continue in full force and effect without change.

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