Document:

EXHIBIT 10.5

[Shapiro & Co. logo]                                               Integrated

                                                                   Marketing
                                  Perma-Tune
                                 Marketing Plan                    Specialists

Objective
---------
To inform wholesalers and investors of the many benefits of the various
PermaTune products in a way that will entice new wholesalers to sell and current
wholesalers to promote the products, and investors to invest.

Strategies
----------
The objectives will be obtained through one-on-one meetings with wholesalers
using professionally-produced collateral materials, through involvement with
investors (based on broker-recommended action) and through public relations.

The six-month marketing plan will be broken into three phases:

          Phase I -                 Produce Collateral Materials

         Phase II -                 Wholesaler Meetings

          Phase III -               Follow-up and Public Relations

Phase I
-------
Shapiro & Company will design and produce material for Perma-Tune to use in
their dealings with wholesalers as well as investors. Projects in this phase
will include:

   Photo Shoot:         First priority will be to conduct a photo shoot to make
                        available professional photos for use in printed
                        materials.

   Mercedes Brochure:   Tri-fold brochure specific to Mercedes product

   Pocket Folder:       We recommend producing a generic Perma-Tune pocket
                        folder that can be used to provide materials to a
                        variety of audiences.

   Price List:          Simple information sheet

   Investor Materials:  Depending on recommendations of broker, these may be
                        printed pieces designed to fit into pocket folder or
                        may be "shells" which can be customized by Perma-Tune
                        for individual use.

               2901 Dallas Parkway, Suite 340 o Plano, Texas 75093
             - 972-608-2626 - Fax: 972-608.2611 - www.shapiroco.com

<PAGE>

Phase II
--------
Perma-Tune will spend time in this phase meeting with wholesalers, using the
tools created in Phase I. This activity will take place primarily in November
since the majority of the desired wholesalers are in California and you already
have plans to be there at that time. We also recommend beginning the public
relations retainer in November to prepare for activity in Phase Ill.

   Wholesaler Meetings: November

   Public Relations:    November/ December; planning for early 2001

Phase III
---------
This phase will consist of follow-up calls to contacts made in Phase II and of
implementing public relations. Time will also be spent in this phase evaluating
the financial status of Perma-Tune, reviewing the marketing efforts to date and
formulating some initial recommendations for the following months.

   Follow-up:           January and February

   Public Relations:    January, February and March

   Evaluate Status:     March

ESTIMATED COSTS

Phase I
-------
Collateral materials                     $ 13,000 - $18,000*
(see individual estimates
provided for each project)

Phase II
--------
PR Retainer                              $ 6,000.00
($3,000 / mo. )

Phase III
---------
PR Retainer                              $ 9,000.00
($3,000/mo.)

*Range based on various options within collateral materials

<PAGE>

  [Graph presentation]

                              PERMA-TUNE MARKETING

                   Oct       Nov     Dec     Jan      Feb     Mar
                  --------- ------- ------  -------- ------ ------

   Collateral     xxxxx
    Materials
---------------- --------- ------- ------  -------- ------- ------
---------------- --------- ------- ------  -------- ------- ------
   Wholesaler
    Meetings/
     Follow-up             xxxxx           xxxxx
---------------- --------- ------- ------  -------- ------- ------
---------------- --------- ------- ------  -------- ------- ------
   Public                  xxxxx   xxxxx   xxxxx    xxxxx   xxxx
    Relations
---------------- --------- ------- ------  -------- ------- ------
---------------- --------- ------- ------  -------- ------- ------<PAGE>   1
                                                                  EXHIBIT 4.1

      COMMON STOCK                                         COMMON STOCK

                              [PDF/SOLUTIONS LOGO]

         THIS CERTIFICATE IS TRANSFERABLE IN CANTON, MA OR NEW YORK, NY

             INCORPORATED UNDER THE LAWS OF THE STATE OF CALIFORNIA

                      SEE REVERSE FOR STATEMENTS RELATING
                            TO RIGHTS, PREFERENCES,
                      PRIVILEGES AND RESTRICTIONS, IF ANY

                               CUSIP 693282 10 5

THIS CERTIFIES THAT

is the record holder of

   FULLY PAID AND NONASSESSABLE SHARES OF THE COMMON STOCK, NO PAR VALUE, OF

                              PDF SOLUTIONS, INC.

transferable on the books of the Corporation by the holder hereof in person or
by duly authorized attorney upon surrender of this Certificate properly
endorsed. This Certificate is not valid unless countersigned and registered by
the Transfer Agent and Registrar.

        WITNESS the facsimile seal of the Corporation and the facsimile
signatures of its duly authorized officers.

Dated:

                                     [SEAL]

/s/  PETER COHN                                      /s/ JOHN KACHIG KIBARIAN
---------------------------                          --------------------------
     SECRETARY                                          PRESIDENT AND CHIEF
                                                        EXECUTIVE OFFICER

COUNTERSIGNED AND REGISTERED:
        EQUISERVE TRUST COMPANY, N.A.
             TRANSFER AGENT AND REGISTRAR

By: /s/ [SIGNATURE ILLEGIBLE]
    ------------------------------------
                    AUTHORIZED SIGNATURE

<PAGE>   2
         COMMON STOCK                                       COMMON STOCK

                             [PDF SOLUTIONS, LOGO]

         THIS CERTIFICATE IS TRANSFERABLE IN CANTON, MA OR NEW YORK, NY

             INCORPORATED UNDER THE LAWS OF THE STATE OF CALIFORNIA

                     SEE REVERSE FOR STATEMENTS RELATING TO
                        RIGHTS, PREFERENCES, PRIVILEGES
                            AND RESTRICTIONS, IF ANY

                               CUSIP 693282 10 5

THIS CERTIFIES THAT

IS THE OWNER OF

            FULLY PAID AND NONASSESSABLE SHARES OF THE COMMON STOCK,
                                NO PAR VALUE, OF

                              PDF SOLUTIONS, INC.

transferable on the books of the Corporation by the holder hereof in person or
by duly authorized attorney upon surrender of this Certificate properly
endorsed.  This Certificate is not valid unless countersigned and registered by
the Transfer Agent and Registrar.

        WITNESS the facsimile seal of the Corporation and the facsimile
signatures of its duly authorized officers.

Dated:

                                     [SEAL]

/s/  PETER COHN                                        /s/  JOHN KACHIG KIBARIAN
     ----------------------                             ------------------------
     SECRETARY                                          PRESIDENT AND CHIEF
                                                        EXECUTIVE OFFICER

COUNTERSIGNED AND REGISTERED:
        EQUISERVE TRUST COMPANY, N.A.
             TRANSFER AGENT AND REGISTRAR

By: /s/ [SIGNATURE ILLEGIBLE]
    ------------------------------------
                    AUTHORIZED SIGNATURE

<PAGE>   3
     A statement of the rights, preferences, privileges and restrictions
granted to or imposed upon the respective classes or series of shares and upon
the holders thereof as established, from time to time, by the Articles of
Incorporation of the Corporation and by any certificate of determination, and
the number of shares constituting each class and series and the designations
thereof, may be obtained by the holder hereof upon written request and without
charge from the Secretary of the Corporation at its corporate headquarters.

     The following abbreviations, when used in the inscription on the face
of this certificate, shall be construed as though they were written out in full
according to applicable laws or regulations:

<TABLE>
        <S>                                            <C>
        TEN COM   --  as tenants in common              UNIF GIFT MIN ACT -- ...................Custodian...............
        TEN ENT   --  as tenants by the entireties                                 (Cust)                    (Minor)
        JT TEN    --  as joint tenants with right of                         under Uniform Gifts to Minors
                      survivorship and not as tenants                        Act........................................
                      in common                                                                 (State)
                                                        UNIF TRF MIN ACT  -- .............Custodian (until age.........)
                                                                                 (Cust)
                                                                             ....................under Uniform Transfers
                                                                                    (Minor)
                                                                             to Minors Act..............................
                                                                                                   (State)
</TABLE>

    Additional abbreviations may also be used though not in the above list.

        FOR VALUE RECEIVED,___________________________hereby sell, assign and
transfer unto

PLEASE INSERT SOCIAL SECURITY OR OTHER
   IDENTIFYING NUMBER OF ASSIGNEE
--------------------------------------

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

_______________________________________________________________________________
 (PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING ZIP CODE, OF ASSIGNEE)

_______________________________________________________________________________

_______________________________________________________________________________

________________________________________________________________________ Shares
of the common stock represented by the within Certificate, and do hereby
irrevocably constitute and appoint

______________________________________________________________________ Attorney
to transfer the said stock on the books of the within named Corporation
with full power of substitution in the premises.

Dated________________________

                                X_______________________________________________

                                X_______________________________________________
                                 THE SIGNATURE(S) TO THIS ASSIGNMENT MUST
                                 CORRESPOND WITH THE NAME(S) AS WRITTEN UPON THE
                       NOTICE:   FACE OF THE CERTIFICATE IN EVERY PARTICULAR,
                                 WITHOUT ALTERATION OR ENLARGEMENT OR ANY
                                 CHANGE WHATSOEVER.

Signature(s) Guaranteed

By___________________________________
THE SIGNATURE(S) MUST BE GUARANTEED
BY AN ELIGIBLE GUARANTOR INSTITUTION
(BANKS, STOCKBROKERS, SAVINGS AND
LOAN ASSOCIATIONS AND CREDIT UNIONS
WITH MEMBERSHIP IN AN APPROVED
SIGNATURE GUARANTEE MEDALLION PROGRAM),
PURSUANT TO S.E.C. RULE 17Ad-15.

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