UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                  SCHEDULE 13D
                    Under the Securities Exchange Act of 1934
                                (Amendment No. 8)


                    ELECTRO SCIENTIFIC INDUSTRIES INC. (ESIO)
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                                (Name of Issuer)

                                  Common Stock
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                         (Title of Class of Securities)

                                    285229100
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                                 (CUSIP Number)

                                David Nierenberg
                               The D3 Family Funds
                               19605 NE 8th Street
                                 Camas, WA 98607
                                 (360) 604-8600

                                 With a copy to:

                               Henry Lesser, Esq.
                                DLA Piper US LLP
                             2000 University Avenue
                            East Palo Alto, CA 94303
                                 (650) 833-2000

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                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)

                                 April 10, 2007
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             (Date of Event which Requires Filing of this Statement)

If the filing person has previously  filed a statement on Schedule 13G to report
the  acquisition  that is the  subject of this  Schedule  13D and is filing this
schedule because of ss.ss. 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the
following box |_|.



--------------------------------------------------------------------------------
    1       NAME OF REPORTING PERSONS
            I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (entities only)

            The D3 Family Fund, L.P.

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    2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)
                                                                         (a) |X|
                                                                         (b) |_|

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    3       SEC USE ONLY


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    4       SOURCE OF FUNDS (See Instructions)
            WC
--------------------------------------------------------------------------------
    5       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
            PURSUANT TO ITEMS 2(d) or 2(e)                            |_|

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    6       CITIZENSHIP OR PLACE OF ORGANIZATION
            Washington
--------------------------------------------------------------------------------
                        7     SOLE VOTING POWER
                              593,762 Common shares (2.0%)

      NUMBER OF     ------------------------------------------------------------
       SHARES           8     SHARED VOTING POWER
    BENEFICIALLY              0
      OWNED BY
        EACH        ------------------------------------------------------------
     REPORTING          9     SOLE DISPOSITIVE POWER
       PERSON                 593,762
        WITH
                    ------------------------------------------------------------
                       10     SHARED DISPOSITIVE POWER
                              0
--------------------------------------------------------------------------------
    11      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
            For the  reporting  person  listed on this  page,  593,762;  for all
            reporting persons as a group, 3,456,884 shares (11.8%)
--------------------------------------------------------------------------------
    12      CHECK  BOX IF THE  AGGREGATE  AMOUNT  IN ROW (11)  EXCLUDES  CERTAIN
            SHARES (See Instructions) |_|
--------------------------------------------------------------------------------
    13      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
            11.8%
--------------------------------------------------------------------------------
    14      TYPE OF REPORTING PERSON (See Instructions)
            PN
--------------------------------------------------------------------------------


                                       2


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    1       NAME OF REPORTING PERSONS
            I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (entities only)

            The DIII Offshore Fund, L.P.

--------------------------------------------------------------------------------
    2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)
                                                                         (a) |X|
                                                                         (b) |_|

--------------------------------------------------------------------------------
    3       SEC USE ONLY


--------------------------------------------------------------------------------
    4       SOURCE OF FUNDS (See Instructions)
            WC
--------------------------------------------------------------------------------
    5       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
            PURSUANT TO ITEMS 2(d) or 2(e)                            |_|

--------------------------------------------------------------------------------
    6       CITIZENSHIP OR PLACE OF ORGANIZATION
            Bahamas
--------------------------------------------------------------------------------
                        7     SOLE VOTING POWER
                              814,414 common shares (2.8%)

      NUMBER OF     ------------------------------------------------------------
       SHARES           8     SHARED VOTING POWER
    BENEFICIALLY              0
      OWNED BY
        EACH        ------------------------------------------------------------
     REPORTING          9     SOLE DISPOSITIVE POWER
       PERSON                 814,414
        WITH
                    ------------------------------------------------------------
                       10     SHARED DISPOSITIVE POWER
                              0
--------------------------------------------------------------------------------
    11      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
            For the  reporting  person  listed on this  page,  814,414;  for all
            reporting persons as a group, 3,456,884 shares (11.8%)
--------------------------------------------------------------------------------
    12      CHECK  BOX IF THE  AGGREGATE  AMOUNT  IN ROW (11)  EXCLUDES  CERTAIN
            SHARES (See Instructions) |_|
--------------------------------------------------------------------------------
    13      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
            11.8%
--------------------------------------------------------------------------------
    14      TYPE OF REPORTING PERSON
            PN
--------------------------------------------------------------------------------


                                       3


--------------------------------------------------------------------------------
    1       NAME OF REPORTING PERSONS
            I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (entities only)

            The D3 Family Bulldog Fund, L.P.

--------------------------------------------------------------------------------
    2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)
                                                                         (a) |X|
                                                                         (b) |_|

--------------------------------------------------------------------------------
    3       SEC USE ONLY


--------------------------------------------------------------------------------
    4       SOURCE OF FUNDS (See Instructions)
            WC
--------------------------------------------------------------------------------
    5       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
            PURSUANT TO ITEMS 2(d) or 2(e)                            |_|

--------------------------------------------------------------------------------
    6       CITIZENSHIP OR PLACE OF ORGANIZATION
            Washington
--------------------------------------------------------------------------------
                        7     SOLE VOTING POWER
                              2,048,708 common shares (7.0%)

     NUMBER OF      ------------------------------------------------------------
      SHARES            8     SHARED VOTING POWER
   BENEFICIALLY               0
     OWNED BY
       EACH         ------------------------------------------------------------
    REPORTING           9     SOLE DISPOSITIVE POWER
      PERSON                  2,048,708
       WITH
                    ------------------------------------------------------------
                       10     SHARED DISPOSITIVE POWER
                              0
--------------------------------------------------------------------------------
    11      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
            For the  reporting  person listed on this page,  2,048,708;  for all
            reporting persons as a group, 3,456,884 shares (11.8%)
--------------------------------------------------------------------------------
    12      CHECK  BOX IF THE  AGGREGATE  AMOUNT  IN ROW (11)  EXCLUDES  CERTAIN
            SHARES (See Instructions) |_|
--------------------------------------------------------------------------------
    13      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
            11.8%
--------------------------------------------------------------------------------
    14      TYPE OF REPORTING PERSON
            PN
--------------------------------------------------------------------------------


                                       4


--------------------------------------------------------------------------------
    1       NAME OF REPORTING PERSONS
            I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (entities only)

            Nierenberg Investment Management Company, Inc.

--------------------------------------------------------------------------------
    2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)
                                                                         (a) |X|
                                                                         (b) |_|

--------------------------------------------------------------------------------
    3       SEC USE ONLY


--------------------------------------------------------------------------------
    4       SOURCE OF FUNDS (See Instructions)
            WC
--------------------------------------------------------------------------------
    5       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
            ITEMS 2(d) or 2(e)                                        |_|

--------------------------------------------------------------------------------
    6       CITIZENSHIP OR PLACE OF ORGANIZATION
            Washington
--------------------------------------------------------------------------------
                        7     SOLE VOTING POWER
                              0

    NUMBER OF       ------------------------------------------------------------
     SHARES             8     SHARED VOTING POWER
  BENEFICIALLY                3,456,884 shares (11.8%)
    OWNED BY
      EACH          ------------------------------------------------------------
   REPORTING            9     SOLE DISPOSITIVE POWER
     PERSON                   0
      WITH
                    ------------------------------------------------------------
                       10     SHARED DISPOSITIVE POWER
                              3,456,884 shares
--------------------------------------------------------------------------------
    11      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
            For the  reporting  person listed on this page,  3,456,884;  for all
            reporting persons as a group, 3,456,884 shares (11.8%)
--------------------------------------------------------------------------------
    12      CHECK  BOX IF THE  AGGREGATE  AMOUNT  IN ROW (11)  EXCLUDES  CERTAIN
            SHARES (See Instructions) |_|
--------------------------------------------------------------------------------
    13      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
            11.8%
--------------------------------------------------------------------------------
    14      TYPE OF REPORTING PERSON
            PN
--------------------------------------------------------------------------------


                                       5


--------------------------------------------------------------------------------
    1       NAME OF REPORTING PERSONS
            I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (entities only)

            Nierenberg Investment Management Offshore, Inc.

--------------------------------------------------------------------------------
    2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)
                                                                         (a) |X|
                                                                         (b) |_|

--------------------------------------------------------------------------------
    3       SEC USE ONLY


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

    4       SOURCE OF FUNDS (See Instructions)
            WC
--------------------------------------------------------------------------------
    5       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
            PURSUANT TO ITEMS 2(d) or 2(e)
                                                                      |_|

--------------------------------------------------------------------------------
    6       CITIZENSHIP OR PLACE OF ORGANIZATION
            Bahamas
--------------------------------------------------------------------------------
                        7     SOLE VOTING POWER
                              0

    NUMBER OF       ------------------------------------------------------------
     SHARES             8     SHARED VOTING POWER
  BENEFICIALLY                814,414 common shares (2.8%)
    OWNED BY
      EACH          ------------------------------------------------------------
   REPORTING            9     SOLE DISPOSITIVE POWER
     PERSON                   0
      WITH
                    ------------------------------------------------------------
                       10     SHARED DISPOSITIVE POWER
                              814,414 common shares
--------------------------------------------------------------------------------
    11      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
            For the  reporting  person  listed  on this  page,  814,414  for all
            reporting persons as a group, 3,456,884 shares (11.8%)
--------------------------------------------------------------------------------
    12      CHECK  BOX IF THE  AGGREGATE  AMOUNT  IN ROW (11)  EXCLUDES  CERTAIN
            SHARES (See Instructions) |_|
--------------------------------------------------------------------------------
    13      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
            11.8%
--------------------------------------------------------------------------------
    14      TYPE OF REPORTING PERSON
            PN
--------------------------------------------------------------------------------


                                       6


      This  Amendment  No. 8 to  Schedule  13D  (this  "Amendment")  amends  the
below-indicated  items from the Schedule 13D previously filed by or on behalf of
the  undersigned  parties (the  "Reporting  Persons") (the "Schedule  13D"),  by
supplementing such Items with the information below:

Item 4.  Purpose of Transaction

We are pleased with ESIO's announcement on April 10 that it booked strong orders
in its third  fiscal  quarter and that its board  approved a $50  million  share
repurchase  program.  We expressed our enthusiasm for these developments  during
the company's conference call.

The concerns which we had expressed in our prior 13D amendment related to ESIO's
balance  sheet  management,  financial  strategy,  and investor  communications.
ESIO's  announcements  on April 10 were  responsive to our concerns.  Though the
initial size of the company's  share  repurchase  program is smaller than we had
proposed,  we  recognize  the  deliberation  which  has gone  into  the  board's
decision,  appreciate  the change in their  direction,  and view  their  initial
commitment as tangible and  substantial.  As we said during the conference call,
we view ESIO's commitment to repurchasing  shares as being  shareholder-friendly
and  accretive.  We  hope  and  trust  that  the  program  will be  carried  out
effectively  and  expeditiously  and that it will  have the  intended  impact on
ESIO's return on equity. Evidently ESIO's board anticipates this as well. If our
thinking proves right,  then we also hope that the company will continue with an
enlarged and ongoing share repurchase program in the future.

As we have said  before,  we have been  patient,  supportive,  and  constructive
shareholders of ESIO for a long time. The company's  April 10  announcement  has
refreshed our patience. As long term investors,  we are now prepared to wait and
watch  the  company's  performance.  We  recognize  that  boosting  ROE into the
mid-teens,  through repurchases and improving operating  performance,  will take
time.  At present,  we do not  anticipate  nominating  our own  alternate  board
candidates at the company's 2007 annual shareholder meeting.

The previous statements as to the views of the Reporting Persons regarding their
investment in ESIO represent  solely their own analyses and judgments,  based on
publicly-available  information and their own internal evaluation thereof. Those
statements are not intended,  and should not be relied on, as investment  advice
to any other investor or prospective  investor.  To the extent those  statements
reflect  assessments of possible  future  developments,  those  assessments  are
inherently  subject to the  uncertainties  associated  with all  assessments  of
future  events;  actual  developments  may  materially  differ  as a  result  of
circumstances  affecting ESIO and/or  extrinsic  factors such as developments in
the  company's  industry and the economic  environment.  The  Reporting  Persons
reserve the right to change their internal  evaluation of this investment in the
future,  as well as to increase or decrease their investment  depending on their
evaluation,  without  further  amending their Schedule 13D except as required by
applicable rules.

Item 5.  Interest in Securities of the Issuer

      (a, b) The Reporting Persons, in the aggregate, beneficially own 3,456,884
common shares, constituting approximately 11.8% of the outstanding shares.


                                       7


      (c) Since  Amendment  No. 7 to Schedule  13D, the  following  purchases of
Shares were made by D3 Family Funds in open market transactions:

        Fund                            Trade Date   Quantity   Price
        ----                            ----------   --------   -----
        D3 Family Fund, LP               3/29/2007     8,560    18.79
        D3 Family Bulldog Fund, LP       3/29/2007    30,440    18.79
        DIII Offshore Fund, LP           3/29/2007    12,000    18.79


                                       8


SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, each of the
undersigned  certifies that the  information set forth in the Statement is true,
complete and correct.

                                           D3 Family Fund, L.P., and D3 Bulldog
                                           Fund, L.P.

                                           By: Nierenberg Investment Management
                                               Company, Inc.

                                           Its: General Partner

April 12, 2007                          By: /s/ David Nierenberg
-------------------------                 ----------------------------------
                                                 David Nierenberg, President


                                           DIII Offshore Fund, L.P.

                                           By: Nierenberg Investment Management
                                               Offshore, Inc.

                                           Its: General Partner

April 12, 2007                          By: /s/ David Nierenberg
-------------------------                 ----------------------------------
                                                 David Nierenberg, President


                                           Nierenberg Investment Management
                                               Company, Inc.


April 12, 2007                          By: /s/ David Nierenberg
-------------------------                 ----------------------------------
                                                 David Nierenberg, President

                                           Nierenberg Investment Management
                                               Offshore, Inc.

April 12, 2007                          By: /s/ David Nierenberg
-------------------------                 ----------------------------------
                                                 David Nierenberg, President


                                       9