TERADYNE INC
S-8, 1996-06-28
INSTRUMENTS FOR MEAS & TESTING OF ELECTRICITY & ELEC SIGNALS
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      As filed with the Securities and Exchange Commission on June 28, 1996
                                                      

================================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                    FORM S-8

                          REGISTRATION STATEMENT UNDER
                           THE SECURITIES ACT OF 1933

                                 TERADYNE, INC.
             (Exact Name of Registrant as Specified in Its Charter)

     Massachusetts                                           04-2272148
(State or Other Jurisdiction of             (I.R.S. Employer Identification No.)
Incorporation or Organization)

                               321 Harrison Avenue
                           Boston, Massachusetts 02118
                    (Address of Principal Executive Offices)
                              --------------------

                        1996 Employee Stock Purchase Plan
                         1991 Employee Stock Option Plan
                            (Full Title of the Plan)
                              --------------------

                                 Owen W. Robbins
                            Executive Vice President
                                 Teradyne, Inc.
                               321 Harrison Avenue
                           Boston, Massachusetts 02118
                     (Name and Address of Agent For Service)

                                  617-482-2700
          (Telephone Number, Including Area Code, of Agent For Service)
                              --------------------
                                   Copies to:

                           William B. Asher, Jr., Esq.
                         Testa, Hurwitz & Thibeault, LLP
                                High Street Tower
                                 125 High Street
                           Boston, Massachusetts 02110
================================================================================
<PAGE>
                                      -2-
<TABLE>

===================================================================================================================
                         CALCULATION OF REGISTRATION FEE

===================================================================================================================
<CAPTION>



                                                     Proposed                 Proposed
                                                     Maximum                  Maximum
 Title of Securities    Amount to be              Offering Price              Aggregate            Amount of
 to be Registered       Registered                   Per Share              Offering Price      Registration Fee
 ----------------       ----------                   ---------              --------------      ----------------
<S>                     <C>                          <C>                    <C>                 <C>    
                                                                          

 1996 Employee Stock
 Purchase Plan

 Teradyne Common Stock,  700,000 shares               $16.75 (1)             $11,725,00          $4,043
 $.125 par value

 1991 Employee Stock
 Option Plan

 Teradyne Common Stock,  3,000,000 shares             $16.75 (1)             $50,250,000         $17,328
 $.125 par value


          TOTAL:         3,700,000 shares                                                        $21,371

===================================================================================================================
<FN>

     (1) None of such shares are subject to  outstanding  options.  The exercise
price of such options  shall be  determined  at the time of grant.  Accordingly,
pursuant to  Rule  457(h)(1),   the  price  of $16.75  per share,   which is the
average of the high and low prices  reported  on the New York Stock  Exchange on
June 26, 1996, is set forth solely for purposes of calculating the filing fee.
</FN>
</TABLE>
<PAGE>
                                      -3-


                                     PART I

              INFORMATION REQUIRED IN THE SECTION 10(a) PROSPECTUS

Item 1.  Plan Information.

         The documents containing the information  specified in this Item 1 will
be sent or  given  to  employees,  directors  or  others  as  specified  by Rule
428(b)(1).  In accordance  with the rules and  regulations of the Securities and
Exchange  Commission (the  "Commission")  and the instructions to Form S-8, such
documents  are not  being  filed  with  the  Commission  either  as part of this
Registration  Statement or as prospectuses or prospectus supplements pursuant to
Rule 424.

Item 2.  Registrant Information and Employee Plan Annual Information.

         The documents containing the information  specified in this Item 2 will
be sent or  given  to  employees,  directors  or  others  as  specified  by Rule
428(b)(1).  In accordance  with the rules and  regulations of the Commission and
the  instructions  to Form S-8,  such  documents  are not being  filed  with the
Commission either as part of this  Registration  Statement or as prospectuses or
prospectus supplements pursuant to Rule 424.

                                     PART II

               INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

Item 3.  Incorporation of Documents by Reference.

         The following  documents  filed by the  Registrant  with the Commission
pursuant to the Securities Exchange Act of 1934, as amended (the "Exchange Act")
are  incorporated  in this  Registration  Statement  by  reference  as of  their
respective dates (File No. 1-6462):

         (a) The  Registrant's  Annual  Report on Form 10-K for the fiscal  year
         ended  December  31,  1995 filed  pursuant  to the  Exchange  Act which
         contains  audited  financial  statements  for  the  fiscal  year  ended
         December 31, 1995.

         (b) The  Registrant's  Quarterly  Report  on Form  10-Q for the  fiscal
         quarter ended March 31, 1996, filed pursuant to the Exchange Act.

         (c) The section entitled "Description of Registrant's  Securities to be
         Registered"  contained in the  Registrant's  Registration  Statement on
         Form 8-A filed  pursuant to Section  12(b) of the Exchange Act on April
         10, 1979.

         All documents  subsequently filed with the Commission by the Registrant
pursuant to Sections  13(a),  13(c),  14 and 15(d) of the Exchange Act, prior to
the filing of a  post-effective  amendment  which  indicates that all securities
offered herein have been sold or which deregisters all securities then remaining
unsold,  shall be deemed to be  incorporated  by reference in this  Registration
Statement and to be a part hereof from the date of filing of such documents.

<PAGE>

                                      -4-


Item 4.  Description of Securities.

         Not applicable.

Item 5.  Interest of Named Experts and Counsel.

         The validity of the Common Stock  offered  hereby has been passed on by
Testa, Hurwitz & Thibeault,  LLP, 125 High Street, Boston,  Massachusetts 02110,
which serves as general counsel to the Registrant. Richard J. Testa, a member of
the  firm  and  Clerk,  Secretary  and  a  director  of  the  Registrant,   owns
beneficially 12,500 shares of Common Stock of the Registrant.

Item 6.  Indemnification of Directors and Officers.

         Section 67 of the Massachusetts Business Corporation Law ("Section 67")
provides  that a  corporation  may  indemnify  its directors and officers to the
extent  specified in or authorized by (i) the articles of  organization,  (ii) a
by-law adopted by the stockholders,  or (iii) a vote adopted by the holders of a
majority of the shares of stock  entitled to vote on the election of  directors.
In all instances,  the extent to which a corporation provides indemnification to
its  directors and officers  under Section 67 is optional.  Article VI ("Article
Six")  of the  Registrant's  Restated  Articles  of  Organization,  as  amended,
provides  indemnification  to the  Registrant's  directors  and  officers to the
fullest extent permitted by Massachusetts law, including  circumstances in which
indemnification  is  otherwise  discretionary.  Section 2 of  Article  VI of the
Registrant's  Amended and  Restated  By-laws  provides  that each  director  and
officer shall be indemnified by the Registrant against  liabilities and expenses
in  connection  with any legal  proceeding to which such officer or director may
become a party by reason of being or having  been an officer or  director of the
Registrant or of any organization in which the Registrant directly or indirectly
owns shares or of which the  Registrant  is a creditor,  and  provides  that the
Board  of  Directors  of  the  Registrant  may,  without  stockholder  approval,
authorize the Registrant to enter into  agreements,  including any amendments or
modifications  thereto,  with any of its  directors  or officers  providing  for
indemnification  of such person to the maximum extent permitted under applicable
law and the  Registrant's  Restated  Articles of Organization,  as amended,  and
Amended and Restated By-Laws.

         Article Six  eliminates  the  personal  liability  of the  Registrant's
directors for monetary  damages for breach of their  fiduciary duty as directors
to the Registrant  and its  stockholders,  notwithstanding  any provision of law
imposing such liability.  Article Six does not, however,  eliminate liability of
the  Registrant's  directors (i) for breach of the director's duty of loyalty to
the Registrant or its stockholders, (ii) for acts or omissions not in good faith
or which involve  intentional  misconduct or a knowing  violation of law,  (iii)
under Section 61 or 62 of the  Massachusetts  Business  Corporation Law, or (iv)
for any  transaction  from  which the  director  derived  an  improper  personal
benefit.

         The  Registrant and its directors and officers are covered by liability
insurance. In addition, the directors and officers of the Registrant are covered
by individual indemnification agreements with the Registrant.

Item 7.  Exemption From Registration Claimed.

         Not applicable.

<PAGE>
                                      -5-

Item 8.  Exhibits.

Exhibit No.       Description of Exhibit
- -----------       ----------------------

4.1               1996 Employee Stock Purchase Plan

4.2               1991 Employee Stock Option Plan

5.1               Opinion of Testa, Hurwitz & Thibeault, LLP

23.1              Consent of Coopers & Lybrand L.L.P.

23.2              Consent of Price Waterhouse LLP

23.3              Consent of Deloitte & Touche LLP

23.4              Consent of Testa, Hurwitz & Thibeault, LLP (included in 
                  Exhibit 5.1)

24.1              Power of Attorney (found on Page 7 of this Registration 
                  Statement)

Item 9.  Undertakings.

         (a)      The undersigned Registrant hereby undertakes:

                  (1) To file,  during any  period in which  offers or sales are
                  being made, a  post-effective  amendment to this  registration
                  statement:

                           (i)  To include any prospectus required by 
                           Section 10(a)(3) of the Securities Act of 1933;
                           
                           (ii) To reflect in the prospectus any facts or events
                           arising after the effective date of the  registration
                           statement   (or  the   most   recent   post-effective
                           amendment  thereof)  which,  individually  or in  the
                           aggregate,  represent  a  fundamental  change  in the
                           information set forth in the registration  statement.
                           Notwithstanding   the  foregoing,   any  increase  or
                           decrease  in volume  of  securities  offered  (if the
                           total dollar value of  securities  offered  would not
                           exceed that which was  registered)  and any deviation
                           from  the low or high  end of the  estimated  maximum
                           offering  range  may  be  reflected  in the  form  of
                           prospectus filed with the Commission pursuant to Rule
                           424(b) if, in the  aggregate,  the  changes in volume
                           and price  represent no more than a 20% change in the
                           maximum  aggregate  offering  price  set forth in the
                           "Calculation  of  Registration   Fee"  table  in  the
                           effective registration statement;

                           (iii) To  include  any  material   information  with
                           respect to the plan of  distribution  not  previously
                           disclosed  in  the  registration   statement  or  any
                           material   change   to   such   information   in  the
                           registration statement;

                  (2) That, for the purpose of determining  any liability  under
                  the Securities Act of 1933, each such post-effective amendment
                  shall be deemed to be a new registration statement relating to

<PAGE>
                                      -6-

                  the  securities  offered  therein,  and the  offering  of such
                  securities at that time shall be deemed to be the initial bona
                  fide offering thereof;

                  (3) To remove from  registration by means of a  post-effective
                  amendment any of the securities  being registered which remain
                  unsold at the termination of the offering.

         (b) The undersigned  Registrant hereby undertakes that, for purposes of
         determining any liability under the Securities Act of 1933, each filing
         of the Registrant's  annual report pursuant to Section 13(a) or Section
         15(d) of the Securities  Exchange Act of 1934 (and,  where  applicable,
         each filing of an employee  benefit  plan's annual  report  pursuant to
         Section  15(d)  of  the  Securities  Exchange  Act  of  1934)  that  is
         incorporated by reference in the registration statement shall be deemed
         to be a new registration  statement  relating to the securities offered
         therein,  and the  offering  of such  securities  at that time shall be
         deemed to be the initial bona fide offering thereof.

         (c) Insofar  as  indemnification  for  liabilities  arising  under the
         Securities  Act of 1933 may be  permitted  to  directors,  officers and
         controlling  persons  of  the  Registrant  pursuant  to  the  foregoing
         provisions,  or otherwise,  the Registrant has been advised that in the
         opinion of the Securities and Exchange Commission such  indemnification
         is against  public  policy as expressed  in the Act and is,  therefore,
         unenforceable.  In the event that a claim for  indemnification  against
         such liabilities  (other than the payment by the Registrant of expenses
         incurred or paid by a director,  officer or  controlling  person of the
         Registrant in the successful defense of any action, suit or proceeding)
         is  asserted  by  such  director,  officer  or  controlling  person  in
         connection with the securities being  registered,  the Registrant will,
         unless in the  opinion of its  counsel  the matter has been  settled by
         controlling  precedent,  submit to a court of appropriate  jurisdiction
         the  question  whether  such  indemnification  by it is against  public
         policy  as  expressed  in the Act and  will be  governed  by the  final
         adjudication of such issue.



<PAGE>

                                      -7-


                                   SIGNATURES

      Pursuant to the requirements of the Securities Act of 1933, the Registrant
certifies  that it has  reasonable  grounds to believe  that it meets all of the
requirements  for  filing  on Form S-8 and has  duly  caused  this  Registration
Statement  to be  signed  on its  behalf  by  the  undersigned,  thereunto  duly
authorized, in Boston, Massachusetts, on the 28th day of June, 1996.

                                                TERADYNE, INC.


                                                By:/s/ Owen W. Robbins
                                                ----------------------       
                                                Owen W. Robbins,
                                                Executive Vice President


                        POWER OF ATTORNEY AND SIGNATURES

      We, the  undersigned  officers and  directors of  Teradyne,  Inc.,  hereby
severally  constitute and appoint  Alexander V. d'Arbeloff,  Owen W. Robbins and
Richard J. Testa,  and each of them singly,  our true and lawful  attorneys with
full power to them, and each of them singly,  to sign for us and in our names in
the capacities  indicated below,  the Registration  Statement filed herewith and
any  and all  amendments  thereto  (including  post-effective  amendments),  and
generally to do all such things in our names and on our behalf in our capacities
as officers and directors to enable Teradyne, Inc. to comply with the provisions
of the  Securities  Act  of  1933,  as  amended,  and  all  requirements  of the
Securities  and  Exchange  Commission,   hereby  ratifying  and  confirming  our
signatures as they may be signed by our said attorneys,  or any of them, to said
Registration Statement and any and all amendments thereto.

      Pursuant  to  the  requirements  of  the  Securities  Act  of  1933,  this
Registration  Statement  has been signed below by the  following  persons in the
capacities and on the dates indicated.

<TABLE>
<CAPTION>

      Signature                               Title(s)                                      Date
      ---------                               --------                                      ----
<S>                                           <C>                                           <C>   

/s/ Alexander V. d'Arbeloff                   Chairman of the Board and                     June 28, 1996
- ------------------------------------          Chief Executive Officer
Alexander V. d'Arbeloff                       


/s/ James A. Prestridge                       Vice Chairman of the Board and                June 28, 1996
- ------------------------------------          Executive Vice President
James A. Prestridge                           


/s/ Owen W. Robbins                           Vice Chairman of the Board and                June 28, 1996
- ------------------------------------          Executive Vice President
Owen W. Robbins                               (Principal Financial Officer)
                          

/s/ George W. Chamillard                      President, Chief Operating                    June 28, 1996
- ------------------------------------          Officer, and Member of the Board                                            
George W. Chamillard                          


<PAGE>

                                      -8-

/s/ Donald J. Hamman                          Controller                                    June 28, 1996
- ------------------------------------                                                                                 
Donald J. Hamman


/s/ Edwin L. Artzt                            Director                                      June 28, 1996
- ------------------------------------
Edwin L. Artzt


/s/ James W. Bagley                           Director                                      June 28, 1996
- ------------------------------------
James W. Bagley


/s/ Albert Carnesale                          Director                                      June 28, 1996
- ------------------------------------
Albert Carnesale


/s/ Daniel S. Gregory                         Director                                      June 28, 1996
- ------------------------------------
Daniel S. Gregory


                                              Director                                      June ___, 1996
- ------------------------------------
Dwight H. Hibbard


/s/ John P. Mulroney                          Director                                      June 28, 1996
- ------------------------------------
John P. Mulroney


/s/ Richard J. Testa                          Director                                      June 28, 1996
- ------------------------------------
Richard J. Testa
</TABLE>

<PAGE>

                                      -9-


                                  EXHIBIT INDEX



Exhibit No.       Description
- -----------       -----------

4.1               1996 Employee Stock Purchase Plan

4.2               1991 Employee Stock Option Plan

5.1               Opinion of Testa, Hurwitz & Thibeault, LLP

23.1              Consent of Coopers & Lybrand L.L.P.

23.2              Consent of Price Waterhouse LLP

23.3              Consent of Deloitte & Touche LLP

23.5              Consent of Testa, Hurwitz & Thibeault, LLP (included in
                  Exhibit 5.1)

24.1              Power of Attorney (found on Page 7 of this Registration
                  Statement)


<PAGE>




                                   Exhibit 4.1



<PAGE>

 

                                 TERADYNE, INC.

                        1996 EMPLOYEE STOCK PURCHASE PLAN

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.

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 have  completed  more than 90 days of  employment  with 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 ninetieth day prior to 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

<PAGE>


"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 700,000,  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  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 3,000 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 3,000 shares except for the 3,000
share limitation, the excess of the amount of the accumulated payroll deductions
over the aggregate purchase price of the 3,000 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.

<PAGE>


         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 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 3,000 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;

<PAGE>


         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 at least thirty days
before the first day of the next succeeding Payment Period or fifteen days 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.

         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  at least thirty days 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.

<PAGE>




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, 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 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 3,000 share  limit,  Code  Section  423(b)(8)  and

<PAGE>


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  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.



<PAGE>



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.

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

<PAGE>


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.

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 4.2

<PAGE>


                                 TERADYNE, INC.

                         1991 EMPLOYEE STOCK OPTION PLAN

                    (Amended and Restated as of May 23, 1996)

         1.  Purpose.  This 1991  Employee  Stock  Option  Plan (the  "Plan") is
intended to provide  incentives  (a) to the  employees  of Teradyne,  Inc.  (the
"Company"),  its parent (if any) and any present or future  subsidiaries  of the
Company   (collectively,   "Related   Corporations")   by  providing  them  with
opportunities to purchase stock in the Company pursuant to options which qualify
as "incentive  stock options" under Section 422 of the Internal  Revenue Code of
1986, as amended (the "Code"),  granted hereunder ("ISO" or "ISOs");  and (b) to
directors,  employees and consultants of the Company and Related Corporations by
providing them with  opportunities  to purchase stock in the Company pursuant to
non-statutory  stock options granted hereunder ("NSO" or "NSOs").  Both ISOs and
NSOs are referred to hereafter  individually as an "Option" and  collectively as
"Options."  As used herein,  the terms  "parent" and  "subsidiary"  mean "parent
corporation" and "subsidiary  corporation" as those terms are defined in Section
425 of the Code.

         2.  Administration of the Plan.

             A.  Board  or  Committee  Administration.  The  Plan   shall be
administered  by the Board of  Directors  of the Company  (the  "Board") or by a
committee appointed by the Board (the "Committee"); provided, that to the extent
required by Rule 16b-3 of the Securities and Exchange  Commission ("Rule 16b-3")
under the  Securities  Exchange Act of 1934,  as amended (the "1934 Act"),  with
respect to  specific  grants of  Options,  the Plan shall be  administered  by a
disinterested  administrator or administrators within the meaning of Rule 16b-3.
Hereinafter all references in this Plan to the "Committee"  shall mean the Board
if no Committee has been appointed. Subject to ratification of the grant of each
Option by the Board (if so required by applicable state law), and subject to the
terms of the Plan,  the Committee  shall have the authority to (i) determine the
employees  of the  Company  and  Related  Corporations  (from among the class of
employees  eligible  under  paragraph  3 to  receive  ISOs) to whom  ISOs may be
granted,  and to determine the individuals and entities (from among the class of
individuals  and entities  eligible  under  paragraph 3 to receive NSOs) to whom
NSOs may be granted;  (ii)  determine  the time or times at which Options may be
granted; (iii) determine the option price of shares subject to each Option; (iv)
determine  whether each Option  granted  shall be an ISO or a NSO; (v) determine
(subject  to  paragraph  7) the time or times  when  each  Option  shall  become
exercisable  and the duration of the exercise  period;  (vi)  determine  whether
restrictions  such as repurchase  options are to be imposed on shares subject to
Options,  and the nature of such  restrictions  if any, and (vii)  interpret the
Plan and  prescribe  and  rescind  rules and  regulations  relating  to it.  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.  The Committee may from time to time adopt such rules and regulations
for  carrying  out the Plan as it may deem  best.  No member of the Board 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.

         3.  Eligible  Employees and Others. ISOs may be granted to any employee
of the Company or any Related Corporation.  NSOs may be granted to any employee,
consultant or director of the Company or any Related Corporation; provided, that
no Option may be granted hereunder to any non-employee director. Granting of any
option to any  individual  or entity shall  neither  entitle that  individual or
entity to, nor disqualify him from, participation in any other grant of Options.

<PAGE>

         4.  Stock. The stock subject to Options shall be authorized but 
unissued  shares of Common Stock of the Company,  par value $.125 per share (the
"Common  Stock"),  or shares of Common  Stock  required  by the  Company  in any
manner.  The aggregate number of shares which may be issued pursuant to the Plan
is  9,000,000,  subject to adjustment as provided in paragraph 13. 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 for
grants of Options under the Plan.

         5.  Granting of Options.  Options may be granted  under the Plan at any
time after March 13, 1991 and prior to March 13,  2001.  The date of grant of an
option under the Plan will be the date specified by the Committee at the time it
grants the Option,  provided,  however, that such date shall not be prior to the
date on which the Committee acts to approve the grant.  The Committee shall have
the right, with the consent of the optionee, to convert an ISO granted under the
Plan to a NSO pursuant to paragraph 16.

         6.  Minimum Option Price; ISO Limitations.

             A.  Price for NSOs.  The  price  per  share  specified  in the
agreement  relating to each NSO granted under the Plan shall in no event be less
than the minimum legal  consideration  therefor  required  under the laws of the
Commonwealth  of  Massachusetts.  No more than 200,000 NSOs may be granted under
the Plan for less than "fair market value" (as hereinafter defined).

             B.  Price for ISOs.  The  price  per  share  specified  in the
agreement relating to each ISO granted under the Plan shall not be less than the
fair market  value per share of Common  Stock on the date of such grant.  In the
case of an ISO to be granted to an employee  owning stock  possessing  more than
ten percent of the total  combined  voting  power of all classes of stock of the
Company  or any  Related  Corporation,  the  price per  share  specified  in the
agreement  relating  to such ISO shall not be less than 110  percent of the fair
market value of Common Stock on the date of grant.

             C. $100,000 Annual  Limitation on ISOs. Each eligible employee
may be granted ISOs only to the extent that,  in the  aggregate  under this Plan
and all incentive stock option plans of the Company and any Related Corporation,
such ISOs do not become  exercisable  for the first time by such employee during
any calendar  year in a manner which would entitle the employee to purchase more
than  $100,000  in fair  market  value  (determined  at the time  the ISOs  were
granted) of Common  Stock in that year.  Any  options  granted to an employee in
excess of such amount will be granted as Non-Qualified Options.

             D.  Determination  of Fair  Market  Value.  If, at the time an
Option is granted under the Plan, the Company's Common Stock is publicly traded,
"fair market  value" shall be  determined  as of the date such Option is granted
and shall  mean (i) the  average  (on that  date) of the high,  low and  closing
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  National  Market  List,  if the Common
Stock is not then traded on a national securities exchange; or (iii) the closing
bid  price  (or  average  of bid  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 National Market List. However, if the Common
Stock is not  publicly  traded at the time an Option is granted  under the Plan,
"fair market  value" shall be deemed to be the fair 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.

         7.  Option  Duration.  Subject to earlier  termination  as  provided in
paragraphs  9 and 10,  each Option  shall  expire on the date  specified  by the
Committee, but not more than (i) ten years and one day from the date of grant in
the case of  NSOs,  (ii)  ten  years  from the date of grant in the case of ISOs

<PAGE>

generally,  and  (iii)  five  years  from  the date of grant in the case of ISOs
granted to an  employee  owning  stock  possessing  more than ten percent of the
total  combined  voting  power of all  classes  of stock of the  Company  or any
Related Corporation.  Subject to earlier termination as provided in paragraphs 9
and 10,  the term of each  ISO  shall  be the  term  set  forth in the  original
instrument  granting such ISO,  except with respect to any part of such ISO that
is converted into a NSO pursuant to paragraph 16.

         8.  Exercise of Option.  Subject to the  provisions of paragraphs 9 
through 12, each option granted under the Plan shall be exercisable as follows:

             A.  Vesting.  The Option shall either be fully  exercisable  on the
         date of grant  or  shall  become  exercisable  thereafter  in such  
         installments  as the Committee may specify.

             B.  Full Vesting of Installments.  Once an installment becomes 
         exercisable it shall remain exercisable until expiration or termination
         of the Option, unless otherwise specified by the Committee.          

             C.  Partial Exercise.  Each Option or installment may be exercised 
         at any time or from time to time, in whole or in part, for up to the 
         total number of shares with respect to which it is then exercisable.
         
             D.  Acceleration of Vesting. The Committee shall have the right
         to accelerate  the date of exercise of any  installment  of any Option;
         provided,  that the  Committee  shall not,  without  the consent of the
         optionee, accelerate the exercise date of any installment of any Option
         granted to any employee as an ISO (and not previously  converted into a
         NSO pursuant to paragraph  16) if such  acceleration  would violate the
         annual  vesting  limitation  contained  in Section 422 of the Code,  as
         described in paragraph 6(C).

         9.  Termination of Employment.  If an optionee ceases to be employed by
the  Company  and all  Related  Corporations  other  than by  reason of death or
disability  as defined in paragraph 10, no further  installments  of his Options
shall become  exercisable,  and his Options shall terminate after the passage of
90 days  from the date of  termination  of his  employment;  provided,  that the
Committee  may specify  that NSOs may remain  exercisable  for more than 90 days
from the date of termination of employment;  provided, further, that in no event
shall any Option or part or  installment  thereof  become or remain  exercisable
after  its  specified  expiration  date.   Employment  shall  be  considered  as
continuing  uninterrupted  during any bona fide leave of absence  (such as those
attributable to illness,  military obligations or governmental service) provided
that the period of such leave does not exceed 90-days or, if longer,  any period
during which such optionee's  right to reemployment is guaranteed by statute.  A
bona fide leave of absence with the written  approval of the Committee shall not
be considered an interruption of employment  under the Plan,  provided that such
written approval contractually  obligates the Company or any Related Corporation
to continue the employment of the optionee after the approved period of absence.
Options granted under the Plan shall not be affected by any change of employment
within or among the Company and Related  Corporations,  so long as the  optionee
continues to be an employee of the Company or any Related  Corporation.  Nothing
in the Plan  shall be deemed to give any  grantee  of any Option the right to be
retained  in  employment  or  other  service  by  the  Company  or  any  Related
Corporation for any period of time.

         Notwithstanding  anything to the contrary  contained above, in the case
of normal retirement, NSOs granted to an optionee shall remain exercisable until
the date which is the earlier of (i) the NSOs' specified expiration date or (ii)
90 days from the date upon which such optionee  becomes employed by a competitor
of the Company, to the extent of the number of shares which have vested prior to
and during such period.  The  Committee  shall have the absolute  discretion  to
determine  whether and as of what date any  optionee is employed by a competitor
of the Company.

<PAGE>

         10. Death; Disability.

             A. Death.  If an  optionee  ceases to be employed by the Company 
         and all Related Corporations by reason of his death, any Option of his 
         may be to exercised,  the extent of the number of shares  with  respect
         to which he has  theretofore  been granted  options  (whether or not 
         such  options have vested in  accordance  with their  terms) by his 
         estate,  personal  representative  or beneficiary  who has acquired the
         Option by will or by the laws of descent and  distribution,  (i) in the
         case of ISOs, at any time prior to the earlier of the  ISOs'  specified
         expiration date or 180 days from the date of the optionee's death or 
         (ii) in the case of NSOs, at any time prior to the earlier of the NSOs'
         specified expirationdate or one year from the date of the optionee's 
         death.

             B.  Disability.  If an   optionee   ceases  to  be  employed by the
         Company and all Related  Corporations by reason of his disability,  any
         Option  theretofore  granted to such optionee shall remain  exercisable
         until the date  which is (i) in the case of ISOs,  the  earlier  of the
         ISOs,  specified  expiration  date or 180  days  from  the  date of the
         termination of the  optionee's  employment or (ii) in the case of NSOs,
         the earlier of the NSOs'  specified  expiration  date or 33 months from
         the date of the termination of the optionee's employment, to the extent
         of the  number of shares (a) which,  in the case of ISOs,  have  vested
         prior to and during the period  specified  in clause (i) and (b) which,
         in the case of NSOs,  have vested  prior to and during the period which
         is 30 months  from the date the  optionee  ceases to be employed by the
         Company.  For the purposes of this Plan,  the term  "disability"  shall
         mean "permanent and total disability" as defined in Section 22(e)(3) of
         the Code or any successor statute.

         11. Assignability. No Option shall be assignable or transferable by the
optionee except by will or by the laws of descent and distribution, and during 
the lifetime of the optionee each Option shall be exercisable only by him.

         12. Terms and  Conditions  of Options.  Options  shall be evidenced by
instruments  (which need not be  identical)  in such forms as the  Committee may
from time to time  approve.  Such  instruments  shall  conform  to the terms and
conditions  set forth in  paragraphs  6 through 11 hereof and may  contain  such
other  provisions as the Committee deems  advisable  which are not  inconsistent
with the Plan,  including  restrictions  applicable  to  shares of Common  Stock
issuable  upon  exercise of Options.  The Committee may from time to time confer
authority  and  responsibility  on one or more of its own members  and/or one or
more officers of the Company to execute and deliver such instruments. The proper
officers of the Company are  authorized  and directed to take any and all action
necessary  or  advisable  from  time to  time to  carry  out the  terms  of such
instruments.

         13. Adjustments.  Upon the occurrence of any of the following events, 
an optionee's rights with respect to Options granted to him hereunder shall be
adjusted as hereinafter provided, unless otherwise specifically provided in the 
written agreement between the optionee and the Company relating to such Option:

             A.  Stock  Dividends and Stock Splits.  If the shares of Common
         Stock shall be subdivided into a greater or smaller number of shares or
         if the  Company  shall  issue any  shares  of  Common  Stock as a stock
         dividend  on its  outstanding  Common  Stock,  the  number of shares of
         Common  Stock  deliverable  upon  the  exercise  of  Options  shall  be
         appropriately increased or decreased  proportionately,  and appropriate
         adjustments  shall be made in the  purchase  price per share to reflect
         such subdivision, combination or stock dividend.

             B.  Consolidations  or  Mergers.  If  the  Company  is  to  be
         consolidated  with or acquired by another  entity in a merger,  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, as to outstanding Options, either (i) make appropriate
         provision for the  continuation  of such Options by  substituting on an

<PAGE>

 
         equitable  basis  for the  shares  then  subject  to such  Options  the
         consideration  payable with respect to the outstanding shares of Common
         Stock in connection with the  Acquisition;  or (ii) upon written notice
         to the  optionees,  provide that all Options must be exercised,  to the
         extent then exercisable,  within a specified number of days of the date
         of such notice, at the end of which period the options shall terminate;
         or (iii)  terminate all Options in exchange for a cash payment equal to
         the  excess of the fair  market  value of the  shares  subject  to such
         Options  (to the  extent  then  exercisable)  over the  exercise  price
         thereof.

             C. Recapitalization  or  Reorganization.  In the  event  of a
         recapitalization  or  reorganization  of  the  Company  (other  than  a
         transaction  described  in  subparagraph  B  above)  pursuant  to which
         securities  of the  Company or of another  corporation  are issued with
         respect to the  outstanding  shares of Common  Stock,  an optionee upon
         exercising  an Option  shall be entitled  to receive  for the  purchase
         price paid upon such exercise the  securities he would have received if
         he  had  exercised  his  Option  prior  to  such   recapitalization  or
         reorganization.

             D.  Modification of ISOs.     Notwithstanding  the foregoing,  any
         adjustments  made pursuant to  subparagraphs  A, B or C with respect to
         ISOs  shall be made only after the  Committee,  after  consulting  with
         counsel for the  Company,  determines  whether such  adjustments  would
         constitute  a  "modification"  of such ISOs (as that term is defined in
         Section 425 of the Code) or would  cause any  adverse tax  consequences
         for the holders of such ISOs.  If the  Committee  determines  that such
         adjustments  made with respect to ISOs would  constitute a modification
         of such ISOs, it may refrain from making such adjustments.

             E.   Dissolution or Liquidation.  In the event of the proposed 
         dissolution or liquidation of the Company, each Option will terminate 
         immediately prior to the consummation of such proposed action or at  
         such other time and subject to such other conditions as shall be 
         determined by the Committee.

             F.  Issuances  of  Securities.  Except as  expressly  provided
         herein,  no issuance by the Company of shares of stock of any class, or
         securities convertible into shares of stock of any class, shall affect,
         and no adjustment by reason  thereof shall be made with respect to, the
         number or price of shares subject to Options.  No adjustments  shall be
         made for dividends paid in cash or in property other than securities of
         the Company.

             G.  Fractional Shares.  No fractional shares shall be issued under 
         the Plan and the optionee shall receive from the Company cash in lieu 
         of such fractional shares.

             H.  Adjustments.  Upon  the  happening  of any  of the  events
         described in  subparagraphs  A, B or C above,  the class and  aggregate
         number of shares set forth in  paragraph  4 hereof  that are subject to
         Options which previously have been or subsequently may be granted under
         the Plan shall also be  appropriately  adjusted  to reflect  the events
         described in such  subparagraphs.  The Committee or the Successor Board
         shall  determine  the  specific  adjustments  to  be  made  under  this
         paragraph 13 and,  subject to paragraph 2, its  determination  shall be
         conclusive.

         If any person or entity  owning  restricted  Common  Stock  obtained by
exercise of an Option receives shares or securities or cash in connection with a
corporate  transaction described in subparagraphs A, B or C above as a result of
owning such restricted  Common Stock, such shares or securities or cash shall be
subject to all of the conditions and  restrictions  applicable to the restricted
Common  Stock  with  respect  to which such  shares or  securities  or cash were
issued, unless otherwise determined by the Committee or the Successor Board.

         14. Means of Exercising  Options. An Option (or any part or installment
thereof)  shall be  exercised  by giving  written  notice to the  Company at its
principal office address.  Such notice shall identify the Option being exercised

<PAGE>


and  specify  the number of shares as to which such  Option is being  exercised,
accompanied by full payment of the purchase price therefor  either (a) in United
States  dollars in cash or by check,  or (b) at the discretion of the Committee,
through  delivery of shares of Common Stock having fair market value equal as of
the date of the exercise to the cash exercise price of the Option, or (c) at the
discretion of the Committee in exceptional  cases, by delivery of the optionee's
personal  recourse  note bearing  interest  payable not less than annually at no
less than 100% of the  lowest  applicable  Federal  rate,  as defined in Section
1274(d)  of  the  Code,  or  (d) at the  discretion  of  the  Committee,  by any
combination of (a), (b) and (c) above. If the Committee exercises its discretion
to permit  payment of the  exercise  price of an ISO by means of the methods set
forth in clauses (b) or (c) of the preceding sentence,  such discretion shall be
exercised  in  writing  at  the  time  of the  grant  of  the  ISO in  question.
Alternatively,  payment  may be made in whole or in part in shares of the Common
Stock of the  Company  already  owned by the  person or persons  exercising  the
Option  or  shares  subject  to the  Option  being  exercised  (subject  to such
restrictions  and  guidelines  as the  Board may  adopt  from time to time),  or
consistent  with  applicable  law,  through the delivery of an assignment to the
Company of a sufficient amount of the proceeds from the sale of the Common Stock
acquired  upon  exercise  of the  Option and an  authorization  to the broker or
selling  agent to pay that  amount to the  Company,  which  sale shall be at the
participant's  direction at the time of exercise.  The holder of an Option shall
not have the rights of a shareholder  with respect to the shares  covered by his
option until the date of issuance of a stock certificate to him for such shares.
Except as  expressly  provided  above in paragraph 13 with respect to changes in
capitalization and stock dividends, no adjustment shall be made for dividends or
similar  rights  for  which  the  record  date is  before  the date  such  stock
certificate is issued.

         15. Term and  Amendment of Plan.  This Plan was adopted by the Board on
March 13, 1991, and shall expire on the end of the day on March 13, 2001 (except
as to Options outstanding on that date). The Board may at any time terminate the
Plan or make such  modification  or  amendment  thereof  as it deems  advisable;
provided,  however,  that the Board may not, without approval by the affirmative
vote of the holders of a majority of the securities of the Company  present,  or
represented,  and entitled to vote at a meeting duly held in accordance with the
applicable  laws  of the  state  in  which  the  Company  is  incorporated,  (i)
materially  increase the benefits accruing to participants  under the Plan; (ii)
increase the number of shares for which  Options may be granted  under the Plan;
or (iii) materially  modify the requirements as to eligibility for participation
in the Plan. Termination or any modification or amendment of the Plan shall not,
without consent of a participant,  affect his rights under an option  previously
granted to him.

         16. Conversion of ISOs into NSOs;  Termination of ISOs. The Committee,
with the  written  approval of any  optionee,  may in its  discretion  take such
actions as may be necessary to convert such optionee's ISOs (or any installments
of portions of installments thereof) that have not been exercised on the date of
conversion  into  NSOs  at any  time  prior  to the  expiration  of  such  ISOs,
regardless  of whether  the  optionee is an employee of the Company or a Related
Corporation at the time of such conversion. Such actions may include, but not be
limited to,  extending the exercise period or reducing the exercise price of the
appropriate  installments of such Options.  At the time of such conversion,  the
Committee  (with the consent of the optionee) may impose such  conditions on the
exercise of the resulting NSOs as the Committee in its discretion may determine,
provided that such conditions shall not be inconsistent with this Plan.  Nothing
in the Plan  shall  be  deemed  to give  any  optionee  the  right to have  such
optionee's  ISOs converted into NSOs, and no such  conversion  shall occur until
and unless the Committee  takes  appropriate  action.  The  Committee,  with the
consent of the optionee,  may also terminate any portion of any ISO that has not
been exercised at the time of such termination.

         17. Application of Funds.  The proceeds received by the Company from 
the sale of shares pursuant to Options granted under the Plan shall be used for 
general corporate purposes.

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

<PAGE>


         19. Withholding of Additional Income Taxes. Upon the exercise of a NSO,
the making of a  Disqualifying  Disposition  (as defined in paragraph 20) or the
vesting of restricted  Common Stock  acquired on the exercise of an Option,  the
Company,  in  accordance  with  Section  3402(a) of the Code,  may  require  the
optionee to pay  additional  withholding  taxes in respect of the amount that is
considered  compensation includable in such person's gross income. The Committee
in its  discretion  may  condition  (i) the  exercise  of an  Option or (ii) the
vesting of restricted  Common Stock  acquired by  exercising  an Option,  on the
optionee's payment of such additional withholding taxes.

         20. Notice to Company of Disqualifying  Disposition.  Each employee who
receives ISO shall agree to notify the Company in writing  immediately after the
employee makes a disqualifying disposition of any Common Stock received pursuant
to  the  exercise  of an  ISO  (a  "Disqualifying  Disposition").  Disqualifying
Disposition means any disposition  (including any sale) of such stock before the
later of (a) two years  after the  employee  was  granted the ISO under which he
acquired such stock,  or (b) one year after the employee  acquired such stock by
exercising  such ISO. If the employee has died before such stock is sold,  these
holding period  requirements do not apply and no Disqualifying  Disposition will
thereafter occur.

         21. Governing Laws; Construction.  The validity and construction of the
Plan and the instruments evidencing Options shall be governed by the laws of the
Commonwealth of Massachusetts.  In construing this Plan, the singular shall 
include the plural and the masculine gender shall include the feminine and 
neuter, unless the context otherwise requires.


<PAGE>



                                   Exhibit 5.1

<PAGE>



                                                                   June 25, 1996


Teradyne, Inc.
321 Harrison Avenue
Boston, Massachusetts 02118

      Re:     Registration Statement on Form S-8 Relating to the
              1996 Employee Stock Purchase Plan and the
              1991 Employee Stock Option Plan (collectively, the "Plans")
              -----------------------------------------------------------

Ladies and Gentlemen:

      Reference is made to the  above-captioned  Registration  Statement on Form
S-8 (the "Registration  Statement") filed by Teradyne, Inc. (the "Company") with
the  Securities  and Exchange  Commission  under the  Securities Act of 1933, as
amended, relating to an aggregate of 3,700,000 shares of Common Stock, par value
$.125 per share, of the Company (the "Shares").

      We are counsel to the Company and are familiar with the proceedings of its
shareholders  and Board of  Directors.  We have  examined  original or certified
copies of the  Company's  Restated  Articles of  Organization,  as amended,  the
Company's Amended and Restated By-Laws,  the corporate records of the Company to
the date hereof, and such other certificates,  documents,  records and materials
as we have deemed necessary in connection with this opinion. 

      We are members only of the Bar of the  Commonwealth of  Massachusetts  and
are  not  experts  in,  and  express  no  opinion  regarding,  the  laws  of any
jurisdiction  other than the Commonwealth of Massachusetts and the United States
of America. 

      Based upon and subject to the  foregoing,  we are of the opinion  that the
Shares issued or proposed to be issued by the Company pursuant to the Plans will
be, upon receipt of the consideration provided for in the Plans, validly issued,
fully paid and  nonassessable  after issuance of such Shares in accordance  with
the terms of the Plans.

      We hereby  consent  to the filing of this  opinion  as Exhibit  5.1 to the
Registration Statement.

                                Very truly yours,


                                /s/ Testa, Hurwitz & Thibeault, LLP
                                -----------------------------------
                                TESTA, HURWITZ & THIBEAULT, LLP





<PAGE>



                                  Exhibit 23.1


<PAGE>


                       CONSENT OF INDEPENDENT ACCOUNTANTS



We consent to the incorporation by reference in this  registration  statement on
Form S-8 of our report dated January 18, 1996,  except as to the third paragraph
of Note E,  for  which  the  date  is  January  31,  1996 on our  audits  of the
consolidated financial statements of Teradyne,  Inc. as of December 31, 1995 and
1994,  and for each of the three years in the period  ended  December  31, 1995,
appearing  in the Annual  Report on Form 10-K of Teradyne,  Inc.  filed with the
Securities and Exchange Commission pursuant to the Securities Act of 1934.



                                                    /s/ Coopers & Lybrand L.L.P.
                                                    ----------------------------
                                                    COOPERS & LYBRAND L.L.P.


Boston, Massachusetts
June 27, 1996
<PAGE>



                                  Exhibit 23.2


<PAGE>


                       CONSENT OF INDEPENDENT ACCOUNTANTS


We  hereby  consent  to the  incorporation  by  reference  in this  Registration
Statement on Form S-8 of our report  dated  September  20, 1995  relating to the
consolidated  financial  statements of Megatest Corporation and its subsidiaries
as of and for the year ended August 31, 1994, which report appears on page 32 of
Teradyne,  Inc.'s  Annual  Report on Form 10-K for the year ended  December  31,
1995.



/s/ Price Waterhouse LLP
- ------------------------
PRICE WATERHOUSE LLP


San Jose, California
June 26, 1996
<PAGE>



                                  Exhibit 23.3


<PAGE>


CONSENT OF DELOITTE & TOUCHE LLP

We consent to the incorporation by reference in this  registration  statement of
Teradyne,  Inc. on Form S-8 of our report dated  September  21, 1993 relating to
the  consolidated   financial   statements  of  Megatest   Corporation  and  its
subsidiaries for the year ended August 31, 1993,  appearing in the Annual Report
on Form 10-K of Teradyne, Inc. for the year ended December 31, 1995.




/s/ Deloitte & Touche LLP
- -------------------------
DELOITTE & TOUCHE LLP

San Jose, California
June 26, 1996



<PAGE>


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