Document:

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                                                                    Exhibit 10.9

                       AMENDMENT TO EMPLOYMENT AGREEMENT

         This Amendment to Employment Agreement (this "Amendment") is made and
entered into as of July 1, 2000 by and between MarketFirst Software, Inc., a
Delaware corporation (the "Company"), and Peter R. Tierney (the "Executive").

          WHEREAS, that certain Amended and Restated Employment Agreement (the
"Agreement") was entered into as of January 1, 2000 by and between the Company
and the Executive.

          WHEREAS, the parties desire to amend the Agreement as set forth below.

          NOW, THEREFORE, in consideration of the mutual covenants,
representations, warranties and agreements contained herein, and intending to be
legally bound hereby, the parties agree as follows:

                                   ARTICLE I
                                  DEFINITIONS

          Except as otherwise defined herein, capitalized terms used herein
shall have the same meanings as those terms are defined in the Agreement.

                                  ARTICLE II
                                  AMENDMENTS

     2.1  Paragraph (a) of Section 2.1 of the Agreement is hereby amended and
restated in its entirety to read as follows:

          "(a)  Base Salary. $235,000 per year base salary, payable in
     installments in accordance with the Company's normal payroll practices,
     less such deductions or withholdings required by law."

     2.2  Paragraph (b) of Section 2.1 of the Agreement is hereby amended and
restated in its entirety to read as follows:

          "(b)  Bonus.  A target bonus of $100,000 per year, payable quarterly
     upon satisfaction of performance goals to be mutually agreed upon by
     Executive and the Board within 90 days after the Commencement Date and
     within 90 days after the beginning of each calendar year thereafter."

     2.3  Except as set forth above, the terms and conditions of the Agreement
shall remain in full force and effect.
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          IN WITNESS WHEREOF, the parties have entered into this Amendment as of
the date first written above.

                                    COMPANY

                                    MARKETFIRST SOFTWARE, INC., a Delaware
                                    corporation

                                    By: /s/ Robert W. Sator
                                      ------------------------------------------
                                      Robert W. Sator, Vice President of
                                        Finance and Administration

                                    EXECUTIVE

                                        /s/ Peter R. Tierney
                                    --------------------------------------------
                                    Peter R. Tierney

                                       2CONFIDENTIAL TREATMENT REQUESTED

                               SECOND AMENDMENT TO
                            SHAREHOLDERS' AGREEMENT

     This SECOND AMENDMENT TO SHAREHOLDERS'  AGREEMENT (the "Second  Amendment")
is dated as of April 1, 2000,  by and among TEXAS  INSTRUMENTS  INCORPORATED,  a
Delaware  corporation  ("TI"),  MEMC  ELECTRONIC  MATERIALS,  INC.,  a  Delaware
corporation ("MEMC"),  and MEMC SOUTHWEST INC., a Delaware corporation ("NUCO").
All terms used herein,  unless otherwise  defined,  shall have the same meanings
ascribed to them in the Agreement (as defined below).

                                    Recitals

     WHEREAS,  TI and MEMC  made and  entered  into that  certain  Shareholders'
Agreement  dated as of May 16, 1995,  which was accepted and ratified by NUCO on
May 30, 1995, and amended by all parties on April 20, 1999 (the "Agreement");

     WHEREAS,  TI, MEMC and NUCO wish to amend the Agreement,  along with the TI
Purchase Agreement,  the Lease and the Sublease, for reasons stated in the First
Amendment to the TI Purchase Agreement ("First TI Purchase Amendment"); and

     WHEREAS,  Article 34 of the  Agreement  allows the  Agreement to be amended
with the written consent of TI, MEMC and NUCO.

     NOW, THEREFORE, the parties agree as follows:

1.   Section  11.02(a)(iii)  of the Agreement is deleted in its entirety and the
     following is substituted in lieu thereof:

          "(iii) restrict TI from practicing first level epi deposition at TI on
     Existing  Products  (as defined in the First TI Purchase  Amendment),  in a
     volume not to exceed  [CONFIDENTIAL  MATERIAL  HAS BEEN  DELETED  AND FILED
     SEPARATELY WITH SEC] per calendar  quarter  through 2003,  after which date
     first  level epi  deposition  by TI on  Existing  Products  will not exceed
     [CONFIDENTIAL MATERIAL HAS BEEN DELETED AND FILED SEPARATELY WITH SEC]"

2.   The following is added to Section 11.02(a)  immediately  preceding the last
     sentence thereof:

          "MEMC may elect at its  expense  to have TI's wafer  purchase  records
     audited by an independent third party acceptable to both parties to confirm
     the volumes set forth in (iii)  above.  In the event TI acquires  200mm epi
     reactors for the purpose of applying second level epi and  subsequently has
     excess   capacity,   TI  has  the  right  to  utilize  these  reactors  for
     [CONFIDENTIAL  MATERIAL  HAS BEEN  DELETED AND FILED  SEPARATELY  WITH SEC]
     first level epi  deposition on products  other than Existing  Products.  In
     addition,  if TI  contemplates  developing  capacity  for  first  level epi
     deposition  on  products  other than  Existing  Products,  MEMC and TI will
     negotiate in good faith a plan  determining  the method and timing in which
     TI may deposit first level epi on such other products."

3.   MEMC and TI agree that they will cause  their  representatives  on the NUCO
     Board of  Directors to approve  and/or  ratify this Second  Amendment,  the
     First TI Purchase  Amendment  and the  amendments to the Lease and Sublease
     referenced in the second "Whereas" clause above.  MEMC and TI further agree
     that the  implementation  of such amendments will be regularly  reviewed by
     the NUCO Board of Directors at their meetings.

4.   Except as specifically amended by this Second Amendment,  all provisions of
     the Agreement shall remain effective and binding. This Amendment,  together
     with the Agreement,  constitutes the entire  agreement  between the Parties
     relating to the subject matter hereof and  supersedes all prior  agreement,
     oral or written, and all other communications between the Parties.

5.   This Amendment shall be governed by the laws of the state of Texas, without
     regard to any conflicts of law principles  that may require the application
     of the laws of any other jurisdiction.

                  [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]

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     IN WITNESS  WHEREOF,  the parties have executed this Second Amendment as of
the date first above  written and the terms herein shall be effective as of that
date.

TEXAS INSTRUMENTS INCORPORATED          MEMC ELECTRONIC MATERIALS, INC.

By:  /s/ K. Balasubramanian             By:  /s/ Klaus R. von Horde
   -----------------------------           -----------------------------
Name:   K. Balasubramanian              Name:   Klaus R. von Horde
Title:  Senior Vice President           Title:  President and Chief Executive
                                                  Officer

MEMC SOUTHWEST INC.

By:  /s/ James Lang
   -----------------------------
Name: James Lang
Title:  PresidentCONFIDENTIAL TREATMENT REQUESTED

                               FIRST AMENDMENT TO
                             TI PURCHASE AGREEMENT

     This FIRST  AMENDMENT TO TI PURCHASE  AGREEMENT (the "First  Amendment") is
dated as of April 1,  2000,  by and  among  TEXAS  INSTRUMENTS  INCORPORATED,  a
Delaware  corporation  ("TI"),  MEMC  ELECTRONIC  MATERIALS,  INC.,  a  Delaware
corporation ("MEMC"),  and MEMC SOUTHWEST INC., a Delaware corporation ("NUCO").
All terms used herein,  unless otherwise  defined,  shall have the same meanings
ascribed to them in the Agreement (as defined below).

                                    Recitals

     WHEREAS,  TI, NUCO and MEMC made and entered into the TI Purchase Agreement
dated as of June 30, 1995 (the "Agreement"); and

     WHEREAS,  TI, MEMC and NUCO wish to amend the Agreement,  the Shareholders'
Agreement,  the  Lease  and the  Sublease  to  further  strengthen  the  MEMC/TI
relationship,  lower the total cost of ownership, provide competitive pricing to
TI,  and to  minimize  time and  resources  required  to  support  the  business
relationship; and

     WHEREAS,  Section 22.03 of the Agreement allows the Agreement to be amended
with the written consent of TI, MEMC and NUCO.

     NOW, THEREFORE, the parties agree as follows:

1.   "Existing  Products" means 125mm epi wafers,  125mm polished wafers, 125 mm
     test monitor wafers,  150 mm epi wafers, 150 mm polished wafers, and 150 mm
     test monitor wafers

2.   Section  4.01(a)  of the  Agreement  is  deleted  in its  entirety  and the
     following is substituted in lieu thereof:

          "(a) Beginning no later than the end of fourth  calendar  quarter 2000
     and ending December 31, 2005, TI commits to purchase, subject to NUCO's and
     MEMC's  (and its  Subsidiaries')  material  compliance  with TI's  quality,
     delivery and service  requirements (as described in Section  2.03(c)),  and
     NUCO and MEMC (and its Subsidiaries) commit to sell to TI in the aggregate,
     a minimum  each year of the lesser of (i)  [CONFIDENTIAL  MATERIAL HAS BEEN
     DELETED  AND FILED  SEPARATELY  WITH SEC] of TI's  worldwide  needs of such
     Existing  Products offered for sale by MEMC (and its Subsidiaries) or NUCO,
     or (ii)  [CONFIDENTIAL  MATERIAL HAS BEEN DELETED AND FILED SEPARATELY WITH
     SEC] (the "Existing  Product Loading  Commitment").  If either NUCO or MEMC
     (or its  Subsidiaries)  cannot supply a specific Existing Product needed by
     TI, TI's Existing Product Loading Commitment stated in this section 4.01(a)
     shall be decreased in equal proportion. Unless mutually agreed differently,
     TI shall  initiate a volume  ramp to MEMC and NUCO in the  second  calendar
     quarter 2000 and shall make an effort to reach the Existing Product Loading
     Commitment by the end of the third calendar  quarter 2000. After 2005, MEMC
     and TI will  negotiate  in good faith  whether the purchase  agreement  for
     Existing Products will be continued, and if so, on what terms."

3.   Section 4.01(b) is deleted in its entirety and the following is substituted
     in lieu thereof:

          "MEMC and TI shall mutually agree on a [CONFIDENTIAL MATERIAL HAS BEEN
     DELETED AND FILED SEPARATELY WITH SEC] for NUCO's Existing Facility."

4.   The second  sentence of Section  4.01(d) of the Agreement is deleted in its
     entirety.

5.   In the second  sentence of Section  4.03(a),  the  parenthetical  phrase is
     deleted and replaced with the following:

          "(unless  such  shortfall  is  solely  attributable  to NUCO or  MEMC,
     including,  but not limited to, NUCO's  inability to supply  products or to
     materially comply with TI's quality, delivery and service requirements,  as
     described in Section 2.03(c))"

6.   Section 4.03(b) is deleted in its entirety.

7.   The following is added as Section 4.05 to Article IV of the Agreement.

          "Purchases  from Other MEMC Sites.  TI agrees to qualify the  existing
     MEMC (and its Subsidiaries') manufacturing sites (Novara, Kuala Lumpur, St.
     Peters,  Utsonimiya) at TI's expense.  If reasonably  requested by MEMC, TI
     agrees  to  qualify  Existing  Products   manufactured  at  MEMC  (and  its
     Subsidiaries')  manufacturing  sites at MEMC's  expense  and at TI's actual
     cost not to exceed  Seventy-Five  Thousand  U.S.  Dollars  (US$75,000)  per
     product qualification.  MEMC and NUCO can elect to supply TI qualified MEMC
     product  from  any TI  qualified  MEMC  (and  Subsidiaries)  site  and TI's
     purchases  of  Existing  Products  manufactured  at such sites  shall count
     towards the fulfillment of TI's Existing Product Loading Commitment."

8.   Section  10.01 (a) and (b) are deleted in their  entirety and the following
     is substituted in lieu thereof:

          "(a)  Beginning  April 1, 2000, the price to be paid by TI to NUCO and
     MEMC (and its  Subsidiaries)  in a calendar quarter for each product in the
     six product  families  (125mm epi, 125 mm polished,  etc.)  comprising  the
     Existing  Products  shall be  [CONFIDENTIAL  MATERIAL  HAS BEEN DELETED AND
     FILED  SEPARATELY  WITH SEC] than the  "Benchmark  Price" for that  product
     family,  defined as the  [CONFIDENTIAL  MATERIAL HAS BEEN DELETED AND FILED
     SEPARATELY  WITH SEC] for  sales of that  product  family  in the  previous
     calendar  quarter to  [CONFIDENTIAL  MATERIAL  HAS BEEN  DELETED  AND FILED
     SEPARATELY  WITH SEC] who purchased  from  [CONFIDENTIAL  MATERIAL HAS BEEN
     DELETED  AND  FILED  SEPARATELY  WITH  SEC] in that  product  family in the
     previous calendar quarter.  The Benchmark Price and the price to be paid by
     TI shall be in U.S.  Dollars.  Beginning July 1, 2000, the price paid by TI
     for any product family in a given quarter shall [CONFIDENTIAL  MATERIAL HAS
     BEEN DELETED AND FILED  SEPARATELY  WITH SEC]. If the calculation of the TI
     price  demonstrates a putative TI price that is [CONFIDENTIAL  MATERIAL HAS
     BEEN DELETED AND FILED SEPARATELY WITH SEC]. A sample price  calculation is
     attached hereto as Exhibit A.

          "(b) During the term of this Amendment and for two  succeeding  years,
     TI may elect, at its expense, to have MEMC's and its Subsidiaries' customer
     sales  records  audited by an  independent  third party  acceptable to both
     parties to confirm that the Benchmark Price has been  calculated  using the
     methodology  described in Exhibit A and if the audit  reveals that MEMC did
     not follow the described methodology and the result is a discrepancy in the
     amount  paid by TI,  NUCO or MEMC,  as the case  may be,  shall  pay TI any
     overpayments  and TI  shall  pay MEMC or  NUCO,  as the  case  may be,  any
     underpayments.  If the  discrepancy is an overpayment by TI exceeding Fifty
     Thousand U.S. Dollars (US$50,000) in a quarter,  MEMC shall pay the cost of
     the audit  attributable  to such  quarter(s).  Details of the audit  report
     shall remain confidential between MEMC and the independent third party."

9.   In Section  14.01,  each  occurrence  of "QDCS" shall be replaced  with the
     following:

          " product quality, delivery and service".

10.  Schedule 1.00 of the Agreement shall be amended to include Section 4.01 (a)
     and (b),  Section 4.05,  and Section 10.01 (a) and (b). With respect to any
     sales of  Existing  Products  by MEMC or any  MEMC  Subsidiary  to TI,  the
     parties agree that the terms and conditions of the Agreement shall apply to
     such  sales  (except  that TI's right of first  refusal in Section  4.01(d)
     shall not apply to MEMC or its Subsidiaries).

11.  TI will  request the consent of Meridian  Trust  Company and Bankers  Trust
     Company to the  Sublease  amendment.  NUCO agrees that once TI has obtained
     such  consent,  NUCO will  promptly  exercise  its option to renew both the
     Lease and the Sublease for the first  Renewal Term (as defined in the Lease
     and Sublease).  TI and NUCO agree that the deadline for exercise by NUCO of
     such renewal options is hereby extended to August 31, 2000. If TI is unable
     to obtain the aforementioned consents prior to August 31, 2000, TI and NUCO
     shall negotiate in good faith a further extension of such deadline.

12.  Except as specifically  amended by this First Amendment,  all provisions of
     the Agreement shall remain effective and binding. This Amendment,  together
     with the Agreement,  constitutes the entire  agreement  between the Parties
     relating to the subject matter hereof and  supersedes all prior  agreement,
     oral or written, and all other communications between the Parties.

13.  Each Party hereto,  its successors,  shareholders and assigns,  release and
     forever  discharge  and hold  harmless  each other Party,  its  successors,
     shareholders  and assigns,  jointly and severally,  of and from any and all
     manner of claims whatsoever because of any manner of thing done, or omitted
     to be done,  existing at any time prior to and  including  the date of this
     Amendment,  in law, in equity or  otherwise,  liquidated  or  unliquidated,
     known or unknown,  suspected  or  unsuspected,  arising  from or related to
     loading commitment,  pricing, QDCS, or practices of epi production. Nothing
     in this  Agreement  shall be  construed as an admission of liability of any
     Party, all such liability being expressly denied.

14.  This Amendment shall be governed by the laws of the state of Texas, without
     regard to any conflicts of law principles  that may require the application
     of the laws of any other jurisdiction.  In no event shall the UN Convention
     on  Contracts  for the  International  Sale of Goods be  applicable  to the
     transactions under the Amendment.

     IN WITNESS  WHEREOF,  the parties have executed this First  Amendment as of
the date first above  written and the terms herein shall be effective as of that
date.

TEXAS INSTRUMENTS INCORPORATED              MEMC ELECTRONIC MATERIALS, INC.

By:  /s/ K. Balasubramanian                 By:  /s/ Klaus R. von Horde
   ------------------------------              ---------------------------------
Name:   K. Balasubramanian                  Name:  Klaus R. von Horde
Title:  Senior Vice President               Title: President and Chief Executive
                                                     Officer

MEMC SOUTHWEST INC.

By:  /s/ James Lang
   ------------------------------
Name:  James Lang
Title:  President

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