ASPECT MEDICAL SYSTEMS INC
S-1/A, 2000-01-27
ELECTROMEDICAL & ELECTROTHERAPEUTIC APPARATUS
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<PAGE>   1

    AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON JANUARY 27, 2000

                                                      REGISTRATION NO. 333-86295
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                            ------------------------

                                AMENDMENT NO. 7

                                       TO

                                    FORM S-1
                          REGISTRATION STATEMENT UNDER
                           THE SECURITIES ACT OF 1933

                          ASPECT MEDICAL SYSTEMS, INC.
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)
                            ------------------------

<TABLE>
<S>                                  <C>                                  <C>
              DELAWARE                               3845                              04-2985553
  (STATE OR OTHER JURISDICTION OF        (PRIMARY STANDARD INDUSTRIAL               (I.R.S. EMPLOYER
   INCORPORATION OR ORGANIZATION)        CLASSIFICATION CODE NUMBER)             IDENTIFICATION NUMBER)
</TABLE>

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

                                TWO VISION DRIVE
                          NATICK, MASSACHUSETTS 01760
                                 (508) 653-0603
  (ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE, OF
                   REGISTRANT'S PRINCIPAL EXECUTIVE OFFICES)
                            ------------------------

                               NASSIB G. CHAMOUN
                     PRESIDENT AND CHIEF EXECUTIVE OFFICER
                          ASPECT MEDICAL SYSTEMS, INC.
                                TWO VISION DRIVE
                             NATICK, MASSACHUSETTS
                                 (508) 653-0603
 (NAME, ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE,
                             OF AGENT FOR SERVICE)
                            ------------------------

                                   COPIES TO:

<TABLE>
<S>                                                    <C>
                SUSAN W. MURLEY, ESQ.                                  LESLIE E. DAVIS, ESQ.
                  HALE AND DORR LLP                               TESTA, HURWITZ & THIBEAULT, LLP
                   60 STATE STREET                                        125 HIGH STREET
             BOSTON, MASSACHUSETTS 02109                            BOSTON, MASSACHUSETTS 02110
              TELEPHONE: (617) 526-6000                              TELEPHONE: (617) 248-7000
               TELECOPY: (617) 526-5000                               TELECOPY: (617) 248-7100
</TABLE>

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

    APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC:  As soon as
practicable after the effective date hereof.

    If any of the securities being registered on this Form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act,
check the following box. [ ]

    If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, check the following box and
list the Securities Act registration statement number of the earlier effective
registration statement for the same offering. [ ] __________

    If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration number of the earlier effective registration statement for the same
offering. [ ] __________

    If this Form is a post-effective amendment filed pursuant to Rule 462(d)
under the Securities Act, check the following box and list the Securities Act
registration number of the earlier effective registration statement for the same
offering. [ ] __________

    If delivery of the Prospectus is expected to be made pursuant to Rule 434,
please check the following box. [ ]
                            ------------------------


    THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(a) OF
THE SECURITIES ACT OF 1933 OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(a),
MAY DETERMINE.

- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>   2


                                EXPLANATORY NOTE



     This Amendment No. 7 to the Registrant's Registration Statement on Form S-1
(Commission File No. 333-86295) is being filed solely for the purpose of filing
Exhibits 3.5, 5.1, 10.3, 10.6, 10.7 and 10.26 thereto.

<PAGE>   3

                                   SIGNATURES


     Pursuant to the requirements of the Securities Act of 1933, the Registrant
has duly caused this Amendment No. 7 to the Registration Statement to be signed
on its behalf by the undersigned, thereunto duly authorized, in Natick,
Massachusetts on January 27, 2000.


                                          ASPECT MEDICAL SYSTEMS, INC.

                                          By:     /s/ J. NEAL ARMSTRONG
                                            ------------------------------------
                                            J. Neal Armstrong
                                            Vice President and Chief Financial
                                              Officer


     Pursuant to the requirements of the Securities Act of 1933, this Amendment
No. 7 to the Registration Statement has been signed below by the following
persons in the capacities and on the dates indicated.


<TABLE>
<CAPTION>
                     SIGNATURE                                    TITLE                      DATE
                     ---------                                    -----                      ----

<C>                                                  <S>                               <C>
              /s/ NASSIB G. CHAMOUN*                 President, Chief Executive        January 27, 2000
- ---------------------------------------------------    Officer and Director
                 Nassib G. Chamoun                     (Principal Executive Officer)

            /s/ J. BRECKENRIDGE EAGLE*               Chairman of the Board of          January 27, 2000
- ---------------------------------------------------    Directors
               J. Breckenridge Eagle

               /s/ J. NEAL ARMSTRONG                 Vice President and Chief          January 27, 2000
- ---------------------------------------------------    Financial Officer (Principal
                 J. Neal Armstrong                     Financial and Accounting
                                                       Officer)

           /s/ BOUDEWIJN L.P.M. BOLLEN*              Director                          January 27, 2000
- ---------------------------------------------------
              Boudewijn L.P.M. Bollen

               /s/ STEPHEN E. COIT*                  Director                          January 27, 2000
- ---------------------------------------------------
                  Stephen E. Coit

                /s/ EDWIN M. KANIA*                  Director                          January 27, 2000
- ---------------------------------------------------
                  Edwin M. Kania

               /s/ LESTER J. LLOYD*                  Director                          January 27, 2000
- ---------------------------------------------------
                  Lester J. Lloyd

               /s/ TERRANCE MCGUIRE*                 Director                          January 27, 2000
- ---------------------------------------------------
                 Terrance McGuire

                /s/ DONALD STANSKI*                  Director                          January 27, 2000
- ---------------------------------------------------
                  Donald Stanski

            *By: /s/ J. NEAL ARMSTRONG
   ---------------------------------------------
                 J. Neal Armstrong
                 Attorney-In-Fact
</TABLE>


<PAGE>   4

                                 EXHIBIT INDEX


<TABLE>
<CAPTION>
EXHIBIT
  NO.                               DESCRIPTION
- -------                             -----------
<C>         <S>
 1.1**      Form of Underwriting Agreement.
 3.1**      Restated Certificate of Incorporation of the Registrant.
 3.2**      Form of Restated Certificate of Incorporation to be in
            effect upon the closing of the offering.
 3.3**      By-Laws of the Registrant, as amended.
 3.4**      Form of Amended and Restated By-laws of the Registrant to be
            in effect upon the closing of the offering.
 3.5        Certificate of Amendment to the Restated Certificate of
            Incorporation of the Registrant (to be filed with the
            Secretary of State of the State of Delaware immediately
            prior to the effectiveness of this Registration Statement).
 4.1**      Specimen common stock certificate.
 4.2**      See Exhibits 3.2 and 3.4 for provisions of the Registrant's
            certificate of incorporation and by-laws defining the rights
            of holders of common stock.
 5.1        Opinion of Hale and Dorr LLP.
10.1**      1998 Director Stock Option Plan, as amended.
10.2+**     International Distribution Agreement, dated as of January
            21, 1998, by and between the Registrant and Nihon Kohden
            Corporation.
10.3+       International License Agreement, dated as of January 21,
            1998, by and between the Registrant and Nihon Kohden
            Corporation.
10.4**      Trademark License Agreement, dated May 25, 1994, by and
            between the Registrant and Aspect Electronics, Inc.
10.5**      License Agreement, dated as of October 31, 1995, by and
            between the Registrant and Siemens Medical Systems, Inc.
10.6+       Product Agreement, dated May 5, 1999, by and between the
            Registrant and Drager Medizintechnik GmbH.
10.7+       OEM Development and Purchase Agreement, dated August 6,
            1999, by and between the Registrant and Agilent
            Technologies, Inc. (formerly part of Hewlett-Packard
            Company).
10.8+**     Letter Agreement, dated August 3, 1999, by and between the
            Registrant and Agilent Technologies, Inc. (formerly part of
            Hewlett-Packard Company).
10.9+**     Distribution and License Agreement, dated as of April 1,
            1996, between SpaceLabs Medical, Inc. and the Registrant.
10.10**     Property Lease at 2 Vision Drive, by and between the
            Registrant and Vision Drive, Inc., successor in interest to
            Natick Executive Park Trust No. 2, dated September 8, 1994,
            as amended, together with Subordination, Non-Disturbance and
            Attornment Agreement, by and between the Registrant and
            Teachers Insurance Association of America, dated June 15,
            1995.
10.11**     Lease Extension Agreement, dated as of August 7, 1997, by
            and between the Registrant and Vision Drive, Inc.
10.12**     Loan and Security Agreement, dated as of December 10, 1999,
            by and between the Registrant and Imperial Bank; together
            with an Intellectual Property Security Agreement, dated as
            of December 10, 1999, by and between the Registrant and
            Imperial Bank and a Securities Account Control Agreement,
            dated as of December 10, 1999, by and between the Registrant
            and Imperial Bank.
10.13**     Promissory Note, dated February 18, 1997, as amended on
            April 14, 1997, made in favor of the Registrant by Nassib G.
            Chamoun, together with Pledge Agreement, dated as of
            February 18, 1997, as amended on April 14, 1997, by and
            between the Registrant and Nassib G. Chamoun.
</TABLE>

<PAGE>   5


<TABLE>
<CAPTION>
EXHIBIT
  NO.                               DESCRIPTION
- -------                             -----------
<C>         <S>
10.14**     Promissory Note, dated May 1, 1997, made in favor of the
            Registrant by Nassib G. Chamoun, together with Pledge
            Agreement, dated as of May 1, 1997, by and between the
            Registrant and Nassib G. Chamoun.
10.15**     Promissory Note, dated May 1, 1997, made in favor of the
            Registrant by Nassib G. Chamoun, together with Pledge
            Agreement, dated as of May 1, 1997, by and between the
            Registrant and Nassib G. Chamoun.
10.16**     Form of Promissory Note made in favor of the Registrant by
            certain directors and executive officers, together with Form
            of Pledge Agreement, by and between the Registrant and
            certain directors and executive officers, together with a
            schedule of material terms.
10.17**     Promissory Note, dated September 24, 1997, made in favor of
            the Registrant by Jeffrey Barrett.
10.18**     Promissory Note, dated April 10, 1998, made in favor of the
            Registrant by Jeffrey Barrett, together with Pledge
            Agreement, dated as of April 10, 1998, by and between the
            Registrant and Jeffrey Barrett.
10.19**     Series E Convertible Preferred Stock and Warrant Purchase
            Agreement, dated December 17, 1998, by and among the
            Registrant and the several purchasers named on Schedule I
            thereto.
10.20**     Fourth Amended and Restated Right of First Refusal and
            Co-Sale Agreement, dated December 17, 1998, by and among the
            Registrant and the several parties named on Schedules I, II
            and III thereto.
10.21**     Fourth Amended and Restated Registration Rights Agreement,
            dated December 17, 1998, by and among the Registrant and the
            several purchasers named on the signature pages thereto.
10.22**     Fourth Amended and Restated Voting Agreement, dated December
            17, 1998, by and among the Registrant and the several
            parties named on Schedules I, II and III thereto.
10.23**     Form of Warrant to purchase the Registrant's common stock,
            together with schedule of Warrantholders.
10.24+**    Supplier Agreement, dated August 13, 1999, between Novation,
            LLC and the Registrant.
10.25+**    Medical Products Distribution Agreement, dated October 1,
            1999, between Hewlett-Packard Company and the Registrant.
10.26+      OEM Development and Purchase Agreement, dated December 22,
            1999, by and between the Registrant and GE Marquette Medical
            Systems, Inc.
23.1        Consent of Hale and Dorr LLP (contained in Exhibit 5.1).
23.2**      Consent of Arthur Andersen LLP.
24.1**      Power of Attorney.
27.1**      Financial Data Schedule for fiscal year end December 31,
            1998.
27.2**      Financial Data Schedule for fiscal year end December 31,
            1999.
</TABLE>


- ------------
 + Confidential treatment has been requested as to certain portions of this
   Exhibit pursuant to Rule 406 promulgated under the Securities Act. Such
   portions have been omitted and filed separately with the Securities and
   Exchange Commission.

** Previously filed.

<PAGE>   1
                                                                     Exhibit 3.5

                            CERTIFICATE OF AMENDMENT
                                     TO THE
                                    RESTATED
                          CERTIFICATE OF INCORPORATION
                                       OF
                          ASPECT MEDICAL SYSTEMS, INC.

                             Pursuant to Section 242
                        of the General Corporation Law of
                              THE STATE OF DELAWARE

     Aspect Medical Systems, Inc. (the "Corporation"), a corporation duly
organized and existing under and by virtue of the General Corporation Law of the
State of Delaware, does hereby certify as follows:

     By vote of the Board of Directors of the Corporation, a resolution was duly
adopted pursuant to Sections 141 and 242 of the General Corporation Law of the
State of Delaware, setting forth an amendment to the Restated Certificate of
Incorporation of the Corporation and declaring said amendment to be advisable
and directing that it be submitted to and be considered by the stockholders of
the Corporation for approval. The stockholders of the Corporation duly approved
said proposed amendment by written consent in lieu of a special meeting in
accordance with Sections 228 and 242 of the General Corporation Law of the State
of Delaware. The resolution setting forth the amendment is as follows:

RESOLVED: That Article FOURTH of the Corporation's Restated Certificate of
          Incorporation, be, and hereby is, amended as follows:

          1.   by deleting the first paragraph in its entirety and inserting a
               new first paragraph in lieu thereof which shall read in its
               entirety as follows:

                    "FOURTH: The total number of shares that the Corporation
                    shall have authority to issue is 82,363,224 shares
                    consisting of 60,000,000 shares of Common Stock, par value
                    $0.01 per share (the "Common Stock"), and 22,363,224 shares
                    of preferred stock, par value $.01 per share (the "Preferred
                    Stock"), of which 406,898 shares have been designated Series
                    A-1 Convertible Preferred Stock (the "Series A-1 Preferred
                    Stock"), 3,800,428 shares have been designated Series B-1
                    Convertible Preferred Stock (the "Series B-1


<PAGE>   2


                    Preferred Stock"), 3,500,000 shares have been designated
                    Series C Convertible Preferred Stock (the "Series C
                    Preferred Stock"), 1,714,286 shares have been designated
                    Series D Convertible Preferred Stock (the "Series D
                    Preferred Stock"), 1,760,000 shares have been designated
                    Series E Convertible Preferred Stock (the "Series E
                    Preferred Stock"), 406,898 shares have been designated
                    Series A-2 Convertible Preferred Stock (the "Series A-2
                    Preferred Stock"), 3,800,428 shares have been designated
                    Series B-2 Convertible Preferred Stock (the "Series B-2
                    Preferred Stock"), 3,500,000 shares have been designated
                    Series C-2 Convertible Preferred Stock (the "Series C-2
                    Preferred Stock"), 1,714,286 shares have been designated
                    Series D-2 Convertible Preferred Stock (the "Series D-2
                    Preferred Stock") and 1,760,000 shares have been designated
                    Series E-2 Convertible Preferred Stock (the "Series E-2
                    Preferred Stock")."

          2.   by deleting Section B.5(a) in its entirety and inserting a new
               Section B.5(a) in lieu thereof which shall read in its entirety
               as follows:

                    "(a) The Corporation may, at its option, require all (and
                    not less than all) holders of shares of any series of
                    Preferred Stock then outstanding to convert their shares of
                    such series of Preferred Stock into shares of Common Stock,
                    at the then effective conversion rate pursuant to Section 4,
                    at any time on or after the closing (the "Closing") of the
                    sale of shares of the Corporation's Common Stock in a firm
                    commitment underwritten public offering pursuant to an
                    effective registration statement under the Securities Act of
                    1933, as amended (the "Securities Act"), (i) on or before
                    June 30, 2000, resulting in at least $20,000,000 of
                    aggregate gross proceeds; and (ii) after June 30, 2000, (x)
                    at a price per share which equals or exceeds $14.00, which
                    number shall be appropriately adjusted for stock splits,
                    stock dividends, combinations, reorganizations,
                    recapitalizations and other similar events involving a
                    change in capital structure of the Corporation; and (y)
                    resulting in at least $20,000,000 of aggregate gross


                                       -2-
<PAGE>   3


                    proceeds; PROVIDED that, in the event an underwritten public
                    offering does not meet the thresholds provided in this
                    paragraph (a), a vote of two-thirds (2/3) of the outstanding
                    shares of Preferred Stock may require all (and not less than
                    all) holders of shares of any series of Preferred Stock then
                    outstanding to convert their shares of such series of
                    Preferred Stock into shares of Common Stock, at the then
                    effective conversion rate pursuant to Section 4."

          3.   by deleting Section B.5(c) in its entirety and inserting a new
               Section B.5(c) in lieu thereof which shall read in its entirety
               as follows:

                    "(c) All certificates evidencing shares of Preferred Stock
                    which are required to be surrendered for conversion in
                    accordance with the provisions hereof shall, from and after
                    the date such certificates are so required to be
                    surrendered, be deemed to have been retired and canceled and
                    the shares of Preferred Stock presented thereby converted
                    into Common Stock for all purposes, notwithstanding the
                    failure of the holder or holders thereof to surrender such
                    certificates on or prior to such date. Upon the closing of
                    the sale of shares of Common Stock in a firm commitment
                    underwritten public offering meeting the requirements of
                    Section 5(a), the number of authorized shares of Series A-1
                    Preferred Stock, Series B-1 Preferred Stock, Series C
                    Preferred Stock, Series D Preferred Stock, Series E
                    Preferred Stock, Series A-2 Preferred Stock, Series B-2
                    Preferred Stock, Series C-2 Preferred Stock, Series D-2
                    Preferred Stock and Series E-2 Preferred Stock shall be
                    automatically reduced by the number of shares of Series A-1
                    Preferred Stock, Series B-1 Preferred Stock, Series C
                    Preferred Stock, Series D Preferred Stock, Series E
                    Preferred Stock, Series A-2 Preferred Stock, Series B-2
                    Preferred Stock, Series C-2 Preferred Stock, Series D-2
                    Preferred Stock and Series E-2 Preferred Stock that had been
                    designated as Series A-1 Preferred Stock, Series B-1
                    Preferred Stock, Series C Preferred Stock, Series D
                    Preferred Stock, Series E Preferred Stock, Series A-2
                    Preferred Stock, Series B-2


                                       -3-
<PAGE>   4


                    Preferred Stock, Series C-2 Preferred Stock, Series D-2
                    Preferred Stock and Series E-2 Preferred Stock and all
                    provisions included under Section 5 of this Article FOURTH
                    and all references to the Series A-1 Preferred Stock, Series
                    B-1 Preferred Stock, Series C Preferred Stock, Series D
                    Preferred Stock, Series E Preferred Stock, Series A-2
                    Preferred Stock, Series B-2 Preferred Stock, Series C-2
                    Preferred Stock, Series D-2 Preferred Stock and Series E-2
                    Preferred Stock in this Restated Certificate of
                    Incorporation shall be deleted and shall be of no further
                    force or effect."


                                       -4-
<PAGE>   5


     IN WITNESS WHEREOF, the Corporation has caused its corporate seal to be
affixed hereto and this Certificate of Amendment to the Restated Certificate of
Incorporation to be signed by its Vice President, Research and Development this
27th day of January, 2000.

                                    ASPECT MEDICAL SYSTEMS, INC.


                                    By: /s/ Philip H. Devlin
                                        ----------------------------------------
                                        Philip H. Devlin
                                        Vice President, Research and Development


                                       -5-

<PAGE>   1

                                                                     Exhibit 5.1


                                HALE AND DORR LLP
                               Counsellors at Law
                   60 State Street, Boston Massachusetts 02109



                                                              January 10, 2000

Aspect Medical Systems, Inc.
Two Vision Drive
Natick, Massachusetts 01760


         RE: Registration Statement on Form S-1
             ----------------------------------

Ladies and Gentlemen:

     This opinion is furnished to you in connection with a Registration
Statement on Form S-1 (Commission File No. 333-86295) (the "Registration
Statement") filed with the Securities and Exchange Commission (the "Commission")
under the Securities Act of 1933, as amended (the "Securities Act"), for the
registration of 3,450,000 shares of Common Stock, $0.01 par value per share (the
"Shares"), of Aspect Medical Systems, Inc., a Delaware corporation (the
"Company"), including 450,000 Shares issuable upon exercise of an over-allotment
option granted by the Company.

     The Shares are to be sold by the Company pursuant to an underwriting
agreement (the "Underwriting Agreement") to be entered into by and among the
Company and Morgan Stanley & Co. Incorporated, Deutsche Bank Securities, Inc.
and U.S. Bancorp Piper Jaffray, Inc., as representatives of the several
underwriters named in Schedule I to the Underwriting Agreement, the form of
which has been filed as Exhibit 1 to the Registration Statement.

     We are acting as counsel for the Company in connection with the issue and
sale by the Company of the Shares. We have examined signed copies of the
Registration Statement as filed with the Commission. We have also examined and
relied upon the Underwriting Agreement, minutes of meetings of the stockholders
and the Board of Directors of the Company as provided to us by the Company,
stock record books of the Company as provided to us by the Company, the
Certificate of Incorporation and By-Laws of the Company, each as restated and/or
amended to date, and such other documents as we have deemed necessary for
purposes of rendering the opinions hereinafter set forth.

     In our examination of the foregoing documents, we have assumed the
genuineness of all signatures, the authenticity of all documents submitted to us
as originals, the conformity to original documents of all documents submitted to
us as copies, the authenticity of the originals of such latter documents and the
legal competence of all signatories to such documents.

     We assume that the appropriate action will be taken, prior to the offer and
sale of the Shares in accordance with the Underwriting Agreement, to register
and qualify the Shares for sale under all applicable state securities or "blue
sky" laws.


<PAGE>   2


Aspect Medical Systems, Inc.
January 10, 2000
Page 2

     We express no opinion herein as to the laws of any state or jurisdiction
other than the state laws of the Commonwealth of Massachusetts, the Delaware
General Corporation Law statute and the federal laws of the United States of
America. To the extent that any other laws govern the matters as to which we are
opining herein, we have assumed that such laws are identical to the state laws
of the Commonwealth of Massachusetts, and we are expressing no opinion herein as
to whether such assumption is reasonable or correct.

     Based upon and subject to the foregoing, we are of the opinion that the
Shares have been duly authorized for issuance and, when the Shares are issued
and paid for in accordance with the terms and conditions of the Underwriting
Agreement, the Shares will be validly issued, fully paid and nonassessable.

     It is understood that this opinion is to be used only in connection with
the offer and sale of the Shares while the Registration Statement is in effect.

     Please note that we are opining only as to the matters expressly set forth
herein, and no opinion should be inferred as to any other matters. This opinion
is based upon currently existing statutes, rules, regulations and judicial
decisions, and we disclaim any obligation to advise you of any change in any of
these sources of law or subsequent legal or factual developments which might
affect any matters or opinions set forth herein.

     We hereby consent to the filing of this opinion with the Commission as an
exhibit to the Registration Statement in accordance with the requirements of
Item 601(b)(5) of Regulation S-K under the Securities Act and to the use of our
name therein and in the related Prospectus under the caption "Legal Matters." In
giving such consent, we do not hereby admit that we are in the category of
persons whose consent is required under Section 7 of the Securities Act or the
rules and regulations of the Commission.


                                        Very truly yours,
                                        /s/ Hale and Dorr LLP
                                        HALE AND DORR LLP


<PAGE>   1
                                                                    EXHIBIT 10.3

                          Aspect Medical Systems, Inc.
has requested that the marked portions of this agreement be granted confidential
  treatment pursuant to Rule 406 under the Securities Act of 1933, as amended.

                         INTERNATIONAL LICENSE AGREEMENT

      THIS AGREEMENT is made and entered into as of January 21, 1998 (the
"Effective Date"), by and between ASPECT MEDICAL SYSTEMS, INC. ("Aspect"), a
Delaware, U.S.A. corporation having offices at 2 Vision Drive, Natick,
Massachusetts 01760-2059, U.S.A., Attention: J. Breckenridge Eagle, Telecopy
No.: 1-508-647-2059, and NIHON KOHDEN CORPORATION ("NK"), a Japanese company
having offices at 31-4 Nishiochiai, 1-chome, Shinjuku-ku, Tokyo 161 Japan,
Attention: Hajime Yasuda, Telecopy No.: 81-3-5996-8097.

      WHEREAS, Aspect possesses certain intellectual and industrial property
rights; and

      WHEREAS, Aspect is willing to grant, and NK desires to acquire,
non-exclusive worldwide rights to use such rights in accordance with the terms
and conditions hereinafter set forth.

      NOW, THEREFORE, in consideration of the premises and mutual promises,
terms and conditions hereinafter set forth, and other good and valuable
consideration, the receipt and sufficiency of which are hereby acknowledged,
Aspect and NK (the "Parties") do hereby agree as follows:

1.    DEFINITIONS

As used herein, the following terms shall have the following definitions.

1.1   AFFILIATES. "Affiliates" of a Party hereto shall mean companies which are
controlled by, control or under common control with such Party. A company shall
be considered an "Affiliate" for only so long as such control exists. For the
purposes of this definition, partnerships or similar entities where a
majority-in-interest of its partners or owners are a Party hereto and/or
Affiliates of such Party shall also be deemed to be Affiliates of such Party.

1.2   AGREEMENT TERM. "Agreement Term" shall mean the period beginning on the
Effective Date and ending on the date of termination or expiration of this
Agreement, as the case may be.

1.3   BIS. "BIS"(TM) shall mean the Bispectral Index,(TM) which is Aspect's
proprietary processed EEG parameter that directly measures the hypnotic effects
of anesthetic and sedative agents on the brain.

<PAGE>   2

1.4   BUSINESS DAY. "Business Day" shall mean a day on which banks are open for
business in Natick, Massachusetts, U.S.A.

1.5   COMMENCEMENT DATE. "Commencement Date" shall mean the earlier of: (a)
May 1, 1999 (unless through no fault of NK, the MHW Approval has been delayed);
and (b) the MHW Approval Date.

1.6   CONTRACT YEAR. "Contract Year" shall mean the 12-month period commencing
on the Commencement Date, and then each 12-month period thereafter.

1.7   KIT. "Kit" shall mean Aspect's BIS Module Kit, as further described in
Exhibit A attached hereto and made a part hereof.

1.8   LICENSED TECHNOLOGY. "Licensed Technology" shall mean the Rights, the
Products and the Technical Information.

1.9   LICENSE TERM. "License Term" shall mean the period beginning on the
Commencement Date and ending on the date of termination or expiration of this
Agreement, as the case may be.

1.10  MHW APPROVAL DATE. "MHW Approval Date" shall mean the date on which NK
receives the approval of the Japanese Ministry of Health and Welfare to market
the Product in Japan.

1.11  PRODUCT. "Product" shall mean a BIS module.

1.12  RIGHTS. "Rights" shall mean:

(a)   the patents listed on Exhibit B attached hereto and made a part hereof,
and all continuations, divisions, extensions and reissues thereof;

(b)   the patent applications listed on Exhibit B hereto, and all continuations,
divisions, extensions and reissues thereof;

(c)   any and all continuations, divisions, reissues, extensions and other
filings that Aspect may file with the governmental agency which issues patents
in any jurisdiction with respect to such patents and/or patent applications
described in parts (a) and (b) above of this definition; and

(d)   all relevant copyrights and circuitry relating to the Software (as defined
in Section 2.6 below) or the Kits; and



                                      -2-
<PAGE>   3

(e)   any and all patents, patent applications, copyrights, mask work rights and
other intellectual property rights with respect to any inventions, which
patents, patent applications, copyrights, mask work rights and other rights (i)
are granted or to be granted to Aspect (either directly or through its
Affiliates, successors, assigns, agents or employees) and (ii) with respect to
which Aspect (either directly or through its Affiliates, successors, assigns,
agents or employees) shall have the right to grant licenses, sublicenses and
rights of the type described in Article 2 below;

PROVIDED, HOWEVER, that with respect to this definition, if any patents,
copyrights, mask work rights or other intellectual property rights have been or
are in the future issued, granted or registered based on or embodied in any
Product or any part of the Technical Information, such patents, copyrights, mask
work rights and other rights shall be deemed included in this definition.

1.13  TECHNICAL INFORMATION. "Technical Information" shall mean all trade
secrets, know-how, computer programs (including copyrights in said software),
knowledge, technology, means, methods, processes, practices, formulas,
techniques, procedures, technical assistance, designs, drawings, apparatus,
written and oral rectifications of data, specifications, assembly procedures,
schematics and other valuable information of whatever nature, whether
confidential or not, and whether proprietary or not, which is now in (or
hereafter, during the Agreement Term, comes into) the possession of Aspect and
which is necessary to the manufacture, assembly, sale, distribution, use,
installation, servicing or testing of the Product.

1.14  U.S. DOLLARS. "U.S. Dollars" shall mean lawful money of the United States
of America, in immediately available funds.



                                      -3-
<PAGE>   4

            Confidential Materials omitted and filed separately with
      the Securities and Exchange Commission. Asterisks denote omissions.



2.    GRANT OF RIGHTS AND LICENSES

Subject to all of the terms and conditions set forth in this Agreement:

2.1   USE OF RIGHTS.

(a)   Aspect hereby grants to NK a non-exclusive, worldwide right and license
during the Agreement Term to practice the Rights in order to manufacture, use
and sell the Product as a component of multi-parameter module patient monitoring
systems manufactured by or for NK. Specifically, but without limitation, the
Rights may not be used to make, use or distribute the Product for incorporation
into stand-alone EEG/BIS monitors.

(b)   During the Agreement Term, Aspect shall not grant, directly or indirectly,
the right and license described in Section 2.1(a) above to any other
manufacturer whose ultimate parent Affiliate has a principal place of business
in Japan.

(c)   For the rights and licenses granted hereunder, NK shall pay Aspect a
license fee of [**] within thirty (30) days of the execution of this Agreement.
NK may [**] of said license fee in order to pay withholding tax levied by the
Government of Japan. NK agrees to send to Aspect tax payment certificates
indicating payment of such withholding tax so that Aspect can be allowed by the
tax authorities of the United States a tax credit in the amount of such
withholding tax deducted in Japan.

2.2   USE OF TECHNICAL INFORMATION.

(a)   Aspect grants to NK a non-exclusive worldwide right and license during the
Agreement Term to use the Technical Information in connection with NK's exercise
of its rights and licenses granted in Section 2.1, and for no other purpose.

(b)   As soon as practical after the Effective Date, Aspect shall provide to NK,
at no additional cost to NK, all of the Technical Information.

2.3   TRADEMARKS, SERVICE MARKS AND TRADE NAMES.

(a)   NK shall be required to mark the Products with Aspect's trademarks,
service marks and trade names listed in Exhibit C hereto (the "Trademarks").
Aspect hereby grants NK the right to use the Trademarks on a non-exclusive basis
only for the License Term and solely for display or advertising purposes in
connection with the Products manufactured and sold in accordance with this
Agreement. During the License Term, NK may use, without Aspect's prior written
consent, trademarks, service marks and trade names in connection with the
Products other than the Trademarks; PROVIDED, HOWEVER, that the Trademarks are
always used in a manner which makes them at least as large and at least as
prominent as any other such trademarks, service marks or trade names appearing
on any such label, display or advertisement. Any use by NK of the Trademarks
shall be deemed to be a use of the same by Aspect. NK shall not at any time do
or permit any act to be done (including



                                      -4-

<PAGE>   5

without limitation registering any of the Trademarks in its own name or the name
of any entity other than Aspect) which may in any way impair the rights of
Aspect in the Trademarks. Except as provided above, NK has no rights in the
Trademarks or of any goodwill associated therewith and NK agrees that, except as
expressly provided in this Agreement, it shall not acquire any rights in respect
thereof and that all such rights and goodwill are, and shall remain, vested in
Aspect.

(b)   In order to comply with Aspect's quality control standards, NK shall: (i)
whenever it uses the Trademarks, include a statement that the Trademarks are
trademarks of Aspect; (ii) use the Trademarks in compliance with all relevant
laws and regulations; (iii) at Aspect's request, provide Aspect with samples of
the Products, so that Aspect can confirm that such Products are being
manufactured hereunder in a manner consistent with the quality standards which
Aspect applies in manufacturing BIS modules itself; and (iv) not modify any of
the Trademarks in any way and not use any of the Trademarks on or in connection
with any goods or services other than the Products.

2.4   RIGHT TO SUBLICENSE. NK shall not have the right to sublicense any of the
rights or licenses granted hereunder without Aspect's prior written consent,
which consent shall be withheld in Aspect's absolute discretion; PROVIDED,
HOWEVER, it is understood that NK shall have the right to grant sublicenses to
NK's Affiliates without Aspect's prior written consent. All sublicenses shall
not become effective until the sublicensee confirms in writing to Aspect that it
agrees to be bound by all of the terms and conditions contained in this
Agreement.

2.5   NO RIGHTS BY IMPLICATION. No rights or licenses with respect to Licensed
Technology are granted or deemed granted hereunder or in connection herewith,
other than those rights or licenses expressly granted in this Agreement.

2.6   SOFTWARE AND COMPUTER PROGRAMS. The Product includes circuitry and
software programs in binary code form which are designed for use with the
Product (the "Circuitry" and the "Software"). For the purpose of this Agreement,
the Circuitry and the Software shall not include any portion of the Product
which is proprietary to NK or which is developed by or licensed to NK,
independently of Rights and Technical Information provided by Aspect hereunder.
Aspect hereby grants to NK a non-exclusive and non-transferable worldwide
license, without the right to sublicense (except to purchasers of the Product
and NK's Affiliates which become sublicensees pursuant to Section 2.4 above),
during the Agreement Term to use the Circuitry, the Software and related
documentation provided by Aspect (the "Documentation") solely in connection with
operation of the Product. NK shall not disclose, furnish, transfer or otherwise
make available the Circuitry, the Software, the Documentation or any portion
thereof in any form to any third party (other than to purchasers of the Product
and NK's Affiliates which becomes sublicensees pursuant to Section 2.4 above)
and shall not duplicate the Circuitry, the Software, the Documentation or any



                                      -5-
<PAGE>   6



part thereof, except in connection with NK's manufacture and assembly of the
Product in accordance with this Agreement. Title to and ownership of and all
proprietary rights in or related to the Circuitry, the Software, the
Documentation and all partial or complete copies thereof shall at all times
remain with Aspect or its licensor(s). This Agreement shall not be construed as
a sale of any rights in the Circuitry, the Software, the Documentation, any
copies thereof or any part thereof. All references in this Agreement to sale,
resale or purchase of the Products, or references of like effect, shall, with
respect to the Circuitry, the Software and the Documentation mean licenses or
sublicenses of the Circuitry, the Software and the Documentation pursuant to
this Section 2.6. NK shall not disassemble, decompile or reverse engineer the
Circuitry, the Software or any part thereof (except in the European Union and
Norway, and only to the extent that it has the right to do so pursuant to
applicable law in order to ensure interoperability with other software
programs). NK shall retain and shall not alter or obscure any notices, markings
or other insignia which are affixed to the Software, the Documentation or any
part thereof at the time of delivery of such Software or such Documentation.

2.7   NON-COMPETITION. NK confirms that is has not previously, directly or
indirectly, marketed or manufactured monitoring equipment, either as stand-alone
monitors or as modules for monitors, which were designed to monitor the depth of
anesthesia. NK confirms that it has not previously, directly or indirectly,
developed monitoring equipment, either as stand-alone monitors or as modules for
monitors, which was designed to: (i) monitor the depth or effects of anesthesia
being administered to patients; and (ii) indicate any index of the depth or
effects of anesthesia to assist anesthesiologists to evaluate the depth or
effects of anesthesia using EEG (electroencephalogram). Until the first (1st)
anniversary of the termination or expiration of this Agreement, as the case may
be, PROVIDED, HOWEVER that: (I) NK shall be permitted, at any time, to develop
monitoring equipment designed to monitor the depth or effects of anesthesia
using physiological measures other than EEG; (II) NK shall be permitted, at any
time, to market and manufacture monitoring equipment designed to monitor the
depth or effects of anesthesia using physiological measures other than EEG, so
long as such equipment has been developed and manufactured by NK; (III) NK shall
be permitted after the expiration or termination of this Agreement to
manufacture and market monitoring equipment developed and manufactured by NK or
by any third party that is designed to monitor the depth or effects of
anesthesia using physiological measures other than EEG; and (IV) NK shall be
permitted to continue to market and improve its existing EEG monitors and
modules. Specifically, it will not be considered a violation of this Section
3(f) for NK to market and improve its existing EEG monitors or modules that
display any of the following parameters of brain function: EEG, EEG trends, CSA,
DSA, EP, EMG, or NCV, subject to the terms and conditions of this Section 2.7.

2.8   CHANGES TO KITS AND PRODUCTS.

(a)   From time to time during the Agreement Term, Aspect may introduce
improvements and modifications to the Kit. Aspect shall promptly deliver to NK
one reproducible copy of manufacturing drawings and engineering specifications
relating to such modification and improvement. NK may use, at its sole
discretion, each such modification or improvement under the terms and conditions
of this Agreement, without paying any additional amounts to Aspect. If NK
determines not to use such modification or improvement, Aspect shall continue to
supply NK with the Kit, but not as so modified or improved.

(b)   Notwithstanding anything contained in this Agreement to the contrary,
Aspect reserves the right from time to time during the License Term to require
NK, after consulting with NK, to modify or improve the Product (including
without limitation the software programs used in connection with the Product) if
the modification or improvement reasonably relates to efficacy or patient
safety. NK shall implement those changes to the Products being manufactured or
to be manufactured and to modify and improve Products previously manufactured
and shipped to customers in



                                      -6-
<PAGE>   7

order to incorporate such changes. In that event, Aspect agrees to repair or
replace Kits previously provided to NK or collected by NK from its customers,
free of charge, whether or not such repair or replacement occurs during the
relevant Warranty Period.

(c)   Aspect shall immediately provide NK with a written notice upon Aspect
becoming aware of the occurrence of any of the following events: (i) Aspect
recalls any Kit, or ceases or suspends the sale of any Kit due to any problem
which relates to such Kit's efficacy or patient safety in any country outside
Japan; (ii) any defect of any Kit or the Licensed Technology, which relates to
such Kit's efficacy or patient safety, is published, reported or made known to
the public by any third party, or found by Aspect; or (iii) any Kit or the
Licensed Technology contributed to or caused a death or serious injury, or any
Kit or the Licensed Technology malfunctioned and if that malfunction occurred
again, it would be likely to contribute or cause a death or serious injury.

2.9   INTELLECTUAL PROPERTY MAINTENANCE FEES. Aspect shall keep current all
Rights relevant to the Products, and shall pay all fees and expenses in
connection therewith promptly as such fees and expenses become due and payable.

2.10   NO KNOWLEDGE OF THIRD PARTY CLAIMS. Aspect represents and warrants to NK
that Aspect knows of no claim by any third party of infringement by Aspect on
such party's patent, trademark, copyright, trade secret or other intellectual
property rights.

2.11   DISCLAIMER OF LIABILITY. ASPECT MAKES NO EXPRESS OR IMPLIED WARRANTY,
STATUTORY OR OTHERWISE, CONCERNING THE LICENSED TECHNOLOGY OR ANY OTHER
INFORMATION COMMUNICATED TO NK, INCLUDING WITHOUT LIMITATION NO WARRANTY OF
FITNESS FOR A PARTICULAR PURPOSE, OR NO WARRANTIES AS TO QUALITY OR THE
USEFULNESS OF THE LICENSED TECHNOLOGY FOR ITS INTENDED PURPOSE; PROVIDED,
HOWEVER, if Aspect or NK shall discover any errors in the Licensed Technology
during the License Term, Aspect shall use commercially reasonable efforts to
correct such errors in the Licensed Technology without cost to NK.

IN NO EVENT, HOWEVER, SHALL ASPECT BE LIABLE TO NK FOR ANY SPECIAL,
CONSEQUENTIAL, INCIDENTAL, EXEMPLARY OR INDIRECT LOSSES OR DAMAGES RESULTING
FROM SUCH ERRORS IN THE LICENSED TECHNOLOGY.



                                      -7-
<PAGE>   8

            Confidential Materials omitted and filed separately with
      the Securities and Exchange Commission. Asterisks denote omissions.



3.    SALES BY ASPECT TO NK

3.1   OFFER AND ACCEPTANCE; PRICING.

(a)   NK shall have the right to purchase from Aspect Kits at a transfer price
of US[**] per Kit. For each proposed purchase by NK from Aspect, NK shall
present a purchase order to Aspect (a "Purchase Order"). Each Purchase Order
shall be deemed an offer to purchase and, unless NK is notified in writing to
the contrary within five (5) Business Days after Aspect receives it, such
Purchase Order shall be deemed accepted by Aspect.

(b)   Aspect's transfer prices shall be FCA (FREE CARRIER) Natick,
Massachusetts, U.S.A. Starting with the second (2nd) Contract Year, Aspect may
change those transfer prices; PROVIDED, HOWEVER, that: (i) such change may be
made only once a year effective as of the first day of April with the prior
written notice to be given by Aspect no later than the last day of December of
the preceding year, after consulting with NK; (ii) the annual increase shall be
no more than [**]; and (iii) no price change shall affect purchase orders
offered by NK and accepted by Aspect prior to the date such price change becomes
effective.

3.2   DELIVERY. Unless NK requests otherwise, all Kits ordered by NK shall be
packed for shipment and storage in accordance with Aspect's standard commercial
practices. It is NK's obligation to notify Aspect of any special packaging
requirements (which shall be at NK's expense if such requirement is in excess of
the scope of normal and necessary packaging for export). Aspect shall deliver
Kits into the possession of a common carrier designated by NK in Natick,
Massachusetts, U.S.A. no later than the date specified for such delivery on the
relevant purchase order. Risk of loss and damage to a Kit shall pass to NK upon
the delivery thereof to the common carrier designated by NK. If NK does not
designate a common carrier by the specified delivery date, then Aspect may do so
on NK's behalf. All claims for non-conforming shipments must be made in writing
to Aspect within thirty (30) days of the passing of risk of loss and damage.

3.3   METHOD OF PAYMENT

(a)   All amounts due and payable with respect to Kits delivered by Aspect in
accordance with this Article 3 shall be paid in full within 30 days after the
date of Aspect's invoice therefor. All such amounts shall be paid in U.S.
Dollars by wire transfer, to such bank or account as Aspect may from time to
time designate in writing. All costs incurred in connection with such wire
transfer shall be the



                                      -8-
<PAGE>   9

responsibility of NK. Whenever any amount hereunder is due on a day which is not
a day on which banks in Natick, Massachusetts, U.S.A. are open for business (a
"Business Day"), such amount shall be paid on the next such Business Day.
Amounts hereunder shall be considered to be paid as of the day on which funds
are received by Aspect's bank. No part of any amount payable to Aspect hereunder
may be reduced due to any counterclaim, set-off, adjustment or other right which
NK might have or assert against Aspect, any other party or otherwise.

(b)   All amounts due and owing to Aspect hereunder but not paid by NK on the
due date thereof shall bear interest (in U.S. Dollars) at the rate 18 per cent
per annum. Such interest shall accrue on the balance of unpaid amounts from time
to time outstanding from the date on which portions of such amounts become due
and owing until payment thereof in full.

3.4   LIMITED WARRANTY.

(a)   With respect to the Kit, Aspect makes the warranties set forth in
Exhibit D attached hereto and made a part hereof. Under no circumstances shall
the warranties set forth in Exhibit D hereto apply to a Kit which has been
customized, modified, damaged or misused by NK or any third party without
Aspect's authorization. NK's sole remedy for a non-conforming Kit is, at
Aspect's election, the repair or replacement thereof.

(b)   THE PROVISIONS OF THE FOREGOING WARRANTIES ARE IN LIEU OF ANY OTHER
WARRANTY, WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL (INCLUDING ANY WARRANTY OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE).

(c)   EXCEPT AS PROVIDED IN SECTION 5.2 HEREIN, ASPECT'S LIABILITY ARISING OUT
OF THE MANUFACTURE, SALE OR SUPPLYING OF KITS OR THEIR USE OR DISPOSITION,
WHETHER BASED UPON WARRANTY, CONTRACT, TORT OR OTHERWISE, SHALL NOT EXCEED THE
ACTUAL PURCHASE PRICE PAID BY NK FOR SUCH KITS.

(d)   After expiration of the Warranty Period, Aspect shall undertake repairs of
Kits or shall provide parts for repairs by NK, at reasonable cost to NK. Both
parties shall agree on the charge for such repairs and parts.

3.5   PRIORITY OF AGREEMENT. In the event of any discrepancy between any
Purchase Order and this Agreement, the terms of this Agreement shall govern.



                                      -9-
<PAGE>   10

            Confidential Materials omitted and filed separately with
      the Securities and Exchange Commission. Asterisks denote omissions.



3.6   MINIMUM PURCHASE REQUIREMENTS WITH RESPECT TO BIS SENSORS.

(a)   NK' s minimum purchase of BIS sensors from Aspect under the international
distribution agreement between the Parties dated as of the date hereof for the
first (1st) Contract Year (as defined in this Agreement) shall be [**] per year
for each Product sold by NK hereunder. For the purpose of this provision, such
one year period for the minimum purchase of BIS sensors for each Product shall
separately commence on the first day of the month following the month when NK
resells such Product to NK's customers. To administer this provision, NK shall
inform Aspect from time to time (but no less frequently than quarterly), to the
extent such information is available to NK, of the names and addresses of
hospitals purchasing Products from NK and the number of Products sold by NK. On
or before the end of the first (1st) Contract Year, the Parties shall review
minimum sensor usage based on the actual experience during such Contract Year,
and shall adjust this requirement accordingly for subsequent Contract Years. For
the purposes of this provision, a "purchase" of sensors within a Contract Year
shall mean paying Aspect for such sensors on or before the last day of such
Contract Year.

(b)   Failure to meet the minimum purchase requirement described in
Section 3.6(a) above shall constitute a material breach of this Agreement for
the purposes of Section 6.2 below. Termination shall be the only consequence of
NK failing to satisfy this minimum purchase requirement.

4.    CONFIDENTIAL INFORMATION

4.1   CONFIDENTIALITY OBLIGATIONS. Each Party (the "disclosing Party") has a
proprietary interest in information which it discloses to the other Party (the
"receiving Party"), whether in connection with this Agreement or otherwise,
which is (a) a trade secret, confidential or proprietary information, (b) not
publicly known, and (c) annotated by a legend, stamp or other written
identification as confidential or proprietary information, or if disclosed
orally, is identified as confidential or proprietary by a written instrument
within 30 days of such disclosure (hereinafter referred to as "Proprietary
Information"). The receiving Party shall disclose the Proprietary Information of
the disclosing Party only to those of its agents and employees to whom it is
necessary in order properly to carry out their duties as limited by the terms
and conditions hereof. Both during and after the Agreement Term, all disclosures
by the receiving Party to its agents and employees shall be held in strict
confidence by such agents and employees. During and after the Agreement Term,
the receiving Party, its agents and employees shall not use the Proprietary
Information for any purpose other than in connection with discharging its duties
pursuant to this Agreement. The receiving Party shall, at its expense, return to
the



                                      -10-
<PAGE>   11

disclosing Party the Proprietary Information of the disclosing Party as soon as
practicable after the termination or expiration of this Agreement. During the
Agreement Term and thereafter, all such Proprietary Information shall remain the
exclusive property of the disclosing Party. This Article 4 shall also apply to
any consultants or subcontractors that the receiving Party may engage in
connection with its obligations under this Agreement.

4.2   EXCEPTIONS. Notwithstanding anything contained in this Agreement to the
contrary, the receiving Party shall not be liable for a disclosure of the
Proprietary Information of the disclosing Party if the information so disclosed:
(a) was in the public domain at the time of disclosure without breach of this
Agreement; or (b) was known to or contained in the records of the receiving
Party from a source other than the disclosing Party at the time of disclosure by
the disclosing Party to the receiving Party and can be so demonstrated; or (c)
becomes known to the receiving Party from a source other than the disclosing
Party without breach of this Agreement by the receiving Party and can be so
demonstrated; or (d) was disclosed pursuant to court order or as otherwise
compelled by law.

5.    INDEMNIFICATIONS

5.1   IN FAVOR OF ASPECT. NK hereby agrees to indemnify, defend and hold
harmless Aspect, its Affiliates and all officers, directors, employees and
agents thereof from all liabilities, claims, damages, losses, costs, expenses,
demands, suits and actions (including without limitation attorneys' fees,
expenses and settlement costs) (collectively, "Damages") arising out of: (i)
NK's failure to comply with relevant laws and regulations; (ii) personal
injuries and/or property damages resulting from the Product which relate to the
portion of the Product developed and manufactured by NK or which relate to the
failure of NK to incorporate the Kit within the Product in accordance with the
Technical Information provided by Aspect hereunder; or (iii) NK's making
representations or warranties with respect to the Kits which are not authorized
by Aspect hereunder.

5.2   IN FAVOR OF NK. Aspect hereby agrees to indemnify, defend and hold
harmless NK, its Affiliates and all officers, directors, employees and agents
thereof from all Damages arising out of: (i) the Products or the Kits infringing
on the intellectual property rights of third parties; (ii) use of the Trademarks
in accordance with Section 2.3(a) above which infringes on the trademark,
service mark or trade name rights of third parties; or (iii) personal injuries
and/or property damages resulting from the Product which relate to the portion
of the Product developed and manufactured by Aspect or which relate to NK's
incorporation of the Kit within the Product in accordance with the Technical
Information provided by Aspect hereunder; PROVIDED, HOWEVER, that:



                                      -11-
<PAGE>   12

(a)   Aspect shall have no obligation for any claim of infringement arising
from: (i) any combination by NK of the Product and/or the Kits with any other
product not supplied or approved in writing by Aspect (unless such combination
is a normal combination with other monitoring equipment or any part thereof),
where such infringement would not have occurred but for such combination; (ii)
the adaptation or modification of the Product and/or the Kits not performed or
not authorized by Aspect, where such infringement would not have occurred but
for such adaptation or modification; (iii) the misuse of the Product and/or the
Kits or the use of the Product and/or the Kits in an application for which they
were not designed by Aspect, where such infringement would not have occurred but
for such use or misuse; or (iv) a claim based on intellectual property rights
owned by NK or any of its Affiliates.

(b)   In the event that the Products are held in a suit or proceeding to
infringe any intellectual property rights of a third party, and the use of the
Product or the Kits is enjoined or Aspect reasonably believes that it is likely
to be found to infringe or likely to be enjoined, Aspect shall, at its sole cost
and expense, either (i) procure for NK the right to continue manufacturing,
using and selling the Products and/or using and selling the Kits, or (ii)
replace the Product and/or the Kits with non-infringing Products of equivalent
functionality. If neither (i) or (ii) are practicable, either party may
terminate this Agreement, effective immediately, upon giving the other party
written notice. Upon such termination, Aspect shall refund to NK the Unused
Portion of the license fee described in Section 2.1(c) above, according to
Section 6.6 below.

(c)   This Section 5.2 constitutes NK's exclusive remedy in the event that the
Product, the Kits and/or the Trademarks infringe on the intellectual property
rights of third parties.

5.3   INDEMNIFICATION PROCEDURES. The Party benefitting from an indemnity
hereunder (the "indemnified party") hereby agrees that: (a) the other Party (the
"indemnifying Party") shall have sole control and authority with respect to the
defense or settlement of any such claim; and (b) the indemnified Party and its
Affiliates, officers, directors, employees and agents thereof shall cooperate
fully with the indemnifying Party, at the indemnifying Party's sole cost and
expense, in the defense of any such claim. Any settlement of any such claims
that imposes any liability or limitation on the indemnifying Party shall not be
entered into without the prior written consent of the indemnifying Party.

5.4   PARTIAL INDEMNIFICATION. In the event a claim is based partially on an
indemnified claim described in Sections 5.1 and/or 5.2 above and partially on a
non-indemnified claim, or is based partially on a claim described in Section 5.1
above and partially on a claim described in Section 5.2 above, any payments and
reasonable attorney fees incurred in connection with such claims are to be
apportioned between the Parties in accordance with the degree of cause
attributable to each Party.



                                      -12-
<PAGE>   13
            Confidential Materials omitted and filed separately with
      the Securities and Exchange Commission. Asterisks denote omissions.


6.    TERMINATION OR EXPIRATION

6.1   EXPIRATION OF AGREEMENT. Unless it is terminated earlier pursuant to this
Article, this Agreement shall continue in full force and effect until it
automatically expires on the fourth (4th) anniversary of the Commencement Date.
Both parties shall discuss the renewal of this Agreement at least six (6) months
prior to such expiration of this Agreement.

6.2   TERMINATION FOR CAUSE. Upon the occurrence of a material breach or default
as to any obligation hereunder by either Party and the failure of the breaching
Party to promptly pursue (within thirty (30) days after receiving written notice
thereof from the non-breaching Party) a reasonable remedy designed to cure (in
the reasonable judgment of the non-breaching Party) such material breach or
default, this Agreement may be terminated by the non-breaching Party by giving
written notice of termination to the breaching Party, such termination being
immediately effective upon the giving of such notice of termination.

6.3   AFTER TERMINATION OR EXPIRATION. The Parties agree that, once this
Agreement is terminated or expires, NK shall immediately cease: (a) any use or
practice of the Licensed Technology; and (b) any development, manufacture, use
or sale of the Product; PROVIDED, HOWEVER, that: (i) NK shall have the right to
manufacture Products using the Kits which are in NK's possession at the time of
such termination or expiration; (ii) NK shall have the right to sell Products
which are in NK's possession at the time of such termination or expiration, and
manufactured by NK under 6.3(a) above, for a period of three (3) months after
such termination or expiration; PROVIDED, HOWEVER, that NK may, at its option,
within ten (10) days after the end of such three (3) month period, notify Aspect
that it has elected to extend this period for nine (9) additional months, in
which case NK shall pay Aspect US [**] for each module sold during such nine (9)
month period; (iii) Aspect or any third party designated by Aspect shall sell to
NK the parts necessary to repair the Products and shall grant to NK the right to
repair Products, for a period reasonably deemed that Products are used by the
customers; and (iv) Aspect or any third party designated by Aspect shall
continue to supply NK with BIS sensors to use with Products, for a period
reasonably deemed that Products are used by the customers.

6.4   PAYMENT OBLIGATIONS CONTINUE. Upon termination or expiration of this
Agreement, nothing shall be construed to release NK from its obligations to pay
Aspect any and all amounts accrued but unpaid pursuant to Article 3 above prior
to the date of such termination or expiration.



                                      -13-
<PAGE>   14
            Confidential Materials omitted and filed separately with
      the Securities and Exchange Commission. Asterisks denote omissions.


6.5   NO DAMAGES FOR TERMINATION. The Parties agree that if either Party
terminates the other Party pursuant to this Article 6, then the terminating
Party shall not be liable for damages or injuries suffered by the other Party as
a result of that termination, unless otherwise expressly provided herein.

6.6   REFUND OF LICENSE FEE. In the event that this Agreement is terminated for
any reason (other than based on a material breach or default of NK in accordance
with Section 6.2 above), the Unused Portion of the license fee paid to Aspect by
NK under Section 2.1(c) of this Agreement shall be refunded to NK by Aspect. For
the purpose of this Agreement, "Unused Portion" shall mean the amount which
equals US [**] multiplied by a fraction, the numerator of which [**] in which
this Agreement is [**] in the period in which this Agreement is effective after
the [**] and the denominator of which is [**]. In no event may this fraction be
less than [**]. In the event that this Agreement is terminated before
Commencement Date (other than based on a material breach or default of NK in
accordance with Section 6.2 above), the full amount of such license fee [**]
shall be refunded to NK.

7.    MISCELLANEOUS

7.1   NO INDIRECT DAMAGES. IN NO EVENT SHALL EITHER PARTY BE LIABLE TO THE OTHER
PARTY FOR SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, LOSS OF PROFITS OR LOSS OF USE DAMAGES) ARISING OUT OF THE
MANUFACTURE, USE, SALE OR SUPPLYING OF THE PRODUCT OR KITS, EVEN IF SUCH PARTY
HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES OR LOSSES.

7.2   ASSIGNMENTS. This Agreement and the rights and obligations hereunder may
not be assigned, delegated or transferred by either Party without the prior
written consent of the other Party; PROVIDED, HOWEVER, that the other Party's
consent shall not be required with respect to any assignment, delegation or
transfer by a Party to (i) an Affiliate of such Party; or (ii) the purchaser of
all or substantially all of the assets or stock of such Party, through merger,
consolidation or otherwise. To the extent permitted by this Agreement, this
Agreement shall be binding upon and inure to the benefit of the permitted
successors and assigns of both Parties.

7.3   GOVERNING LAW. This Agreement shall be construed and governed according
to, and any arbitration shall be conducted in accordance with, the laws of the
Commonwealth of Massachusetts, U.S.A., excluding its conflicts of laws
principles.

7.4   DISPUTE RESOLUTION. Any dispute, controversy or claim arising out of or
relating to this Agreement or to a breach hereof, including its interpretation,
performance or termination, shall be finally resolved by arbitration. The
arbitration shall be conducted by three (3) arbitrators, one to be appointed by
Aspect, one to be appointed by NK and a third being nominated by the two
arbitrators so selected or, if they cannot agree on a third arbitrator, by the
President of the American Arbitration Association. The arbitration shall be
conducted in English and in accordance with the commercial arbitration rules of
the United Nations Commission



                                      -14-
<PAGE>   15

on International Trade Law. The arbitration, including the rendering of the
award, shall take place in Los Angeles, California, U.S.A. and shall be the
exclusive forum for resolving such dispute, controversy or claim. The decision
of the arbitrators shall be binding upon the parties hereto, and the expense of
the arbitration (including without limitation the award of attorneys' fees to
the prevailing party) shall be paid as the arbitrators determine. The decision
of the arbitrators shall be executory, and judgment thereon may be entered by
any court of competent jurisdiction. Notwithstanding anything contained in this
Section to the contrary, each Party shall have the right to institute judicial
proceedings against the other Party or anyone acting by, through or under such
other Party, in order to enforce the instituting Party's rights hereunder
through reformation of contract, specific performance, injunction or similar
equitable relief.

7.5   ENTIRE AGREEMENT. This Agreement supersedes and cancels any previous
agreements or understandings, whether oral, written or implied, heretofore in
effect and sets forth the entire agreement between Aspect and NK with respect to
the subject matter hereof. No modification or change may be made in this
Agreement except by written instrument duly signed by a duly authorized
representative of each Party.

7.6   NOTICES. All notices given under this Agreement shall be in writing and
shall be addressed to the Parties at their respective addresses and telecopy
numbers, and to the attention of the individuals set forth above. Either Party
may change its address, telecopy number and contact person for purposes of this
Agreement by giving the other Party written notice of its new address, telecopy
number or contact person. Any such notice if given or made by registered or
recorded delivery international air mail letter shall be deemed to have been
received on the earlier of the date actually received and the date fifteen (15)
calendar days after the same was posted (and in proving such it shall be
sufficient to prove that the envelope containing the same was properly addressed
and posted as aforesaid) and if given or made by telecopy transmission shall be
deemed to have been received at the time of dispatch, unless such date of deemed
receipt is not a day on which banks in the receiving party's home city are open
for business, in which case the date of deemed receipt shall be the next day on
which banks in the receiving party's home city are open for business.

7.7   WAIVERS. None of the conditions or provisions of this Agreement shall be
held to have been waived by any act or knowledge on the part of either Party,
except by an instrument in writing signed by a duly authorized officer or
representative of such Party. Further, the waiver by either Party of any right
hereunder or the failure to enforce at any time any of the provisions of this
Agreement, or any rights with respect thereto, shall not be deemed to be a
waiver of any other rights hereunder or any breach or failure of performance of
the other Party.



                                      -15-
<PAGE>   16

7.8   RESPONSIBILITY FOR TAXES. Taxes now or hereafter imposed with respect to
the transactions contemplated hereunder (with the exception of income taxes or
other taxes imposed upon Aspect and measured by the gross or net income of
Aspect, and with the exception of withholding tax set forth in Section 2.1(c)
above) shall be the responsibility of NK, and if paid or required to be paid by
Aspect, the amount thereof shall be added to and become a part of the amounts
payable by NK hereunder.

7.9   SEVERABILITY. If any provision of this Agreement is declared invalid or
unenforceable by a court having competent jurisdiction, it is mutually agreed
that this Agreement shall endure except for the part declared invalid or
unenforceable by order of such court. The Parties shall consult and use their
best efforts to agree upon a valid and enforceable provision which shall be a
reasonable substitute for such invalid or unenforceable provision in light of
the intent of this Agreement.

7.10  COUNTERPARTS. This Agreement may be executed in one or more counterparts,
each of which shall be deemed an original, but all of which together shall
constitute one and the same instrument.

7.11  RELATIONSHIP OF THE PARTIES.

(a)   The relationship between Aspect and NK shall not be construed to be that
of employer and employee, nor to constitute a partnership, joint venture or
agency of any kind. Neither Party shall have any right to enter into any
contracts or commitments in the name of, or on behalf of, the other Party, or to
bind the other Party in any respect whatsoever.

(b)   NK shall not obligate or purport to obligate Aspect by issuing or making
any affirmations, representations, warranties or guaranties with respect to Kits
to any third party, other than the warranties described in Exhibit D hereto.

7.12  LANGUAGE. All written material, correspondence, Technical Information,
notices and oral assistance supplied by either Party hereunder shall be in the
English language.

7.13  SURVIVAL OF CONTENTS. Notwithstanding anything else in this Agreement to
the contrary, the parties agree that Sections 2.7, 2.11, 3.3 and 3.4 and
Articles 4, 5, 6 and 7 shall survive the termination or expiration of this
Agreement, as the case may be.


                                      -16-
<PAGE>   17
7.14  COMPLIANCE WITH LAWS. NK covenants that all of its activities under or
pursuant to this Agreement shall comply with all applicable laws, rules and
regulations. NK shall be responsible for obtaining all licenses, permits and
approvals which are necessary or advisable for sales of Products in all
jurisdictions and for the performance of its duties hereunder. In particular,
but without limitation, NK shall be responsible for all submissions to the MHW
which may be required to obtain marketing approval of the Product. NK shall use
its best efforts to obtain such MHW approvals as expeditiously as possible. NK
shall promptly give Aspect written notice of the MHW Approval Date. Aspect
shall: (i) fully comply with any applicable law, regulation and rule of
government of the United States and agencies or instrumentalities thereof; and
(ii) maintain all U.S. governmental approvals and licenses necessary to produce
and export the Kit.


                                      -17-
<PAGE>   18
7.15  HEADINGS. Any headings contained herein are for directory purposes only,
do not constitute a part of this Agreement, and shall not be employed in
interpreting this Agreement.

     IN WITNESS WHEREOF, the parties hereto have signed this Agreement under
seal.

                                          ASPECT MEDICAL SYSTEMS, INC.

                                          By /s/ J. B. Eagle
                                             -----------------------------------
                                          Name:  J. B. Eagle
                                          Title: Chairman

                                          NIHON KOHDEN CORPORATION

                                          By /s/ Kazuo Ogino
                                             -----------------------------------
                                          Name:  Kazuo Ogino
                                          Title: Prsident and Chief Executive


EXHIBIT A     Description of BIS Module Kit
EXHIBIT B     Patents and Patent Applications
EXHIBIT C     Trademarks, Service Marks and Trade Names
EXHIBIT D     Warranties for Kit


                                      -18-
<PAGE>   19


EXHIBIT A

DESCRIPTION OF BIS MODULE KIT

The BIS `Module Kit' is designed specifically for OEM applications and allows
the integration of Aspect's BIS monitoring technology into OEM patient
monitoring systems. The BIS Engine will interface to the patient via the Aspect
BIS sensor and to the OEM equipment utilizing a serial (RS-232) 3-wire interface
and the necessary power connections.

The BIS module kits consists of a Digital Signal Converter (DSC-2) that is
placed in proximity to the patient and a small circuit board that resides in the
OEM equipment. The DSC-2 is a small (palm sized) front-end to the BIS Engine
circuit board that provides the patient interface and performs the high
performance analog to digital conversion of the EEG signals. The EEG signals are
transmitted in digital format from the DSC-2 to the BIS engine circuit board via
a 20 foot cable that is hard wired connected at the DSC-2.

The BIS Engine circuit board measures 3 x 4 inches. This board performs digital
signal processing on the digitized EEG signal and outputs the Bispectral Index
to the OEM system via the RS-232 serial connection. The board is constructed
using double sided surface mount techniques. The connections to the BIS Engine
circuit board are a serial interface (RS-232) and power.

Detailed Technical Specifications:

Digital Output:               RS-232 Serial Output
                              (8 data, 1 stop, no parity 115 kBaud)

Parameters:                   BIS, Suppression Ratio,
                              EMG, Raw EEG

Electrical Safety:            Conforms to UL 544, IEC-601-1

Power:                        3.5 Watts Maximum
                              +5V (500 mA)
                              +12V (77 mA)

Artifact Rejection:           Automatic


                                      -19-
<PAGE>   20


Bispectral Index:   0-100 Scale

Digital Signal Converter (DSC-2)

Description: The DSC amplifies and digitizes the signal close to the patient to
minimize electrical interference.

Weight:        4.7 oz (0.13 kg)

Dimensions:    2.6 x 1.0 x 4.3 inches
               (6.6 x 2.5 x 10.8 cm)

Cable Length: 23 ft (7.0 m) integral DSC cable, 1.5 ft (0.45) patient interface
cable.



BIS Engine PCB

Physical:           3x4 inch SMT PCB
Processing Power:   50 MFlops

Software Upgrades

The BIS engine software is stored in reprogrammable FLASH memory. Software
upgrades can be accomplished on-site or remotely via the serial interface.

Serial Identifier

Each BIS engine is given a unique serial identifier. This allows for electronic
identification of every BIS Engine.




                                      -20-
<PAGE>   21

EXHIBIT B

PATENTS AND PATENT APPLICATIONS

<TABLE>
<CAPTION>
<S>            <C>                  <C>                                          <C>

- -------------- -------------------- -------------------------------------------- -------
 US PATENT #        PATENT                              DESCRIPTION
- -------------- -------------------- -------------------------------------------- -------
  4,907,597    EEG BIS #1           Cerebral Bio-Potential Analysis Patents
- -------------- -------------------- covering adaption of bispectral analysis     -------
  5,010,891    EEG BIS #2           and means for extracting information for
- -------------- -------------------- diagnostic and monitoring applications       -------
  5,320,109    EEG BIS #3
- -------------- --------------------                                              -------
  5,458,117    EEG BIS #4
- -------------- -------------------- -------------------------------------------- -------
  5,381,804    A1000/A1050/DSC      Interface to biopotential signal acquisition
- -------------- -------------------- -------------------------------------------- -------
  5,305,746    ZipPrep Electrode    Self-prepping electrode technology
- -------------- -------------------- -------------------------------------------- -------
   pending     BIS Sensor System    Interface to BIS Disposable
                                    Sensor/Electrode
- -------------- -------------------- -------------------------------------------- -------
   pending     BIS Sensor           Disposable
                                    BIS (Zip Prep) Sensor
- -------------- -------------------- -------------------------------------------- -------
</TABLE>











                                      -21-
<PAGE>   22

EXHIBIT C

TRADEMARKS



           Aspect(R)

           ZIPPREP(TM)

           Zipprep(TM)

           A-1050(TM)

           A-1000(TM)

           A-2000(TM)

           Bispectral Index(TM)

           BIS(TM)

           BIS(TM)





                                      -22-

<PAGE>   23

EXHIBIT D

WARRANTY

Aspect warrants to the initial Purchaser that the BIS MODULE KIT ("Warranted
Product") will be free from defects in workmanship or materials, when given
normal, proper, and intended usage for a period of 18 months from the date of
its initial shipment to Purchaser, or 12 months from the date of resale by
Purchaser, whichever period first expires. Excluded from this warranty are
expendable components and supply items such as, but not limited to, electrodes,
cables, and prep solutions. Aspect's obligations under this warranty are to
repair or replace any Warranted Product or part thereof that Aspect reasonably
determines to be covered by this warranty and to be defective in workmanship or
materials provided that the Purchaser has given notice of such warranty claim
within the Warranty Period and the Warranted Product is returned to the factory
with freight prepaid. Repair or replacement of Products under this warranty does
not extend the Warranty Period.

To request repair or replacement under this warranty, Purchaser should contact
Aspect at 2 Vision Drive, Natick, Massachusetts 01760, 800-442-2051 or
508-647-2088. Aspect will authorize Purchaser to return the Warranted Product
(or part thereof) to Aspect. Aspect shall determine whether to repair or replace
Products and parts covered by this warranty and all Products or parts replaced
shall become Aspect's property. In the course of warranty service, Aspect may
but shall not be required to make engineering improvements to the Warranted
Product or part thereof. If Aspect reasonably determines that a repair or
replacement is covered by the warranty, Aspect shall bear the costs of shipping
the repaired or replacement Product to Purchaser. All other shipping costs shall
be paid by Purchaser. Risk of loss or damage during shipments under this
warranty shall be borne by the party shipping the Product. Products shipped by
Purchaser under this warranty shall be packaged in the original shipping
container or equivalent packaging to protect the Product. If Purchaser ships a
Product to Aspect in unsuitable packaging, any physical damage present in the
Product on receipt by Aspect (and not previously reported) will be presumed to
have occurred in transit and will be the responsibility of Purchaser.

Unless authorized or instructed by Aspect in advance, this warranty does not
extend to any Warranted Products or part thereof: that have been subject to
misuse, neglect or accident; that have been damaged by causes external to the
Warranted Product, including but not limited to failure of or faulty electrical
power; that have been used in violation of Aspect's instructions; that have been
affixed to any nonstandard accessory attachment; on which the serial number has
been removed or made illegible; that have been modified by anyone other than
Aspect; or that have been disassembled, serviced, or reassembled by anyone other
than Aspect, unless authorized by Aspect. Aspect shall have no obligation to
make repairs, replacements, or corrections which result, in whole or in part,
from normal wear and tear. Aspect



                                      -23-
<PAGE>   24

makes no warranty (a) with respect to any products that are not Warranted
Products, (b) with respect to any products purchased from a person other than
Aspect or an Aspect-authorized distributor or (c) with respect to any product
sold under a brand name other than Aspect.














                                      -24-
<PAGE>   25

THIS WARRANTY IS THE SOLE AND EXCLUSIVE WARRANTY FOR ASPECT'S PRODUCTS, EXTENDS
ONLY TO THE PURCHASER AND IS EXPRESSLY IN LIEU OF ANY OTHER EXPRESS OR IMPLIED
WARRANTIES INCLUDING WITHOUT LIMITATION ANY WARRANTY AS TO MERCHANTABILITY OR
FITNESS FOR A PARTICULAR PURPOSE. EXCEPT AS OTHERWISE PROVIDED HEREIN, ASPECT'S
MAXIMUM LIABILITY ARISING OUT OF THE SALE OF THE PRODUCTS OR THEIR USE, WHETHER
BASED ON WARRANTY, CONTRACT, TORT OR OTHERWISE, SHALL NOT EXCEED THE ACTUAL
PAYMENTS RECEIVED BY ASPECT IN CONNECTION THEREWITH. ASPECT SHALL NOT BE LIABLE
FOR ANY INCIDENTAL, SPECIAL OR CONSEQUENTIAL LOSS, DAMAGE OR EXPENSE (INCLUDING
WITHOUT LIMITATION LOST PROFITS) DIRECTLY OR INDIRECTLY ARISING FROM THE SALE,
INABILITY TO SELL, USE OR LOSS OF USE OF ANY PRODUCT. EXCEPT AS SET FORTH
HEREIN, ALL PRODUCTS ARE SUPPLIED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER
EXPRESS OR IMPLIED.

























                                      -25-

<PAGE>   1
                                                 Drager/Aspect Product Agreement
                                                         Drager-Aspect Vers1.doc
                                                                        20.04.99

                                                                    Exhibit 10.6


                          Aspect Medical Systems, Inc.
has requested that the marked portions of this agreement be granted confidential
  treatment pursuant to Rule 406 under the Securities Act of 1933, as amended.

                         Drager/Aspect Product Agreement



                                     between

                          Aspect Medical Systems, Inc.
                                 2 Vision Drive
                                     Natick
                                  MA 01760-2059
                                       USA

                         - hereinafter called "Aspect" -


                                       and

                           Drager Medizintechnik GmbH
                            Moislinger Allee 53 - 55
                                  23558 Lubeck
                                     Germany
                         - hereinafter called "Drager" -

         - Aspect and Drager together hereinafter called "the Parties" -


<PAGE>   2
                                                 Drager/Aspect Product Agreement
                                                                        20.04.99
                                      - 2 -

     Confidential Materials omitted and filed separately with the Securities
              and Exchange Commission. Asterisks denote omissions.

Whereas Aspect has a long-standing tradition of designing, manufacturing and
distributing neuromonitors including the BIS (Bispectral Index) and Sensors for
neuromonitors.


Whereas Drager has a long-standing tradition of designing, manufacturing and
distributing medical equipment.


Whereas Drager is in the process of designing a new anesthesia workplace.


Whereas Drager wishes to integrate Aspect's BIS technology and to offer a
Drager-BIS-Module as an option into this and other workplace solutions for the
[**] and [**]


Whereas Aspect desires to sell and Drager desires to purchase, on the terms and
conditions set forth below in this Agreement, certain quantities of Aspect BIS
Module Kits and the required Sensors manufactured by Aspect.

Now, therefore,

in consideration of the mutual covenants, terms and conditions hereinafter
expressed, the Parties agree as follows:

1.       DEFINITIONS

1.1      The term "Aspect BIS Module Kits" shall mean Aspect's BIS Module Kits
         as further defined in the specifications in Exhibit A.

         The Parties hereto may change Exhibit A, to the extent it may then be
         necessary to reflect a subsequent modification made pursuant to Clause
         7 of this Agreement.

1.2      The term "Drager-BIS-Module" shall mean an Aspect BIS Module Kit that
         is integrated by Drager into a Drager Workplace.


<PAGE>   3
                                                 Drager/Aspect Product Agreement
                                                                        20.04.99
                                      - 3 -

     Confidential Materials omitted and filed separately with the Securities
              and Exchange Commission. Asterisks denote omissions.

1.3      The term "Aspect BIS Sensor" shall mean a single use disposable sensor
         for the use with the Aspect BIS Module Kits or the Aspect stand-alone
         BIS monitor.

1.4      The term [**] shall mean a [**] that has been [**] in accordance with
         [**] to [**] with the [**] Drager shall own all right, title, and
         interest in any modifications (the "[**]" made to the [**] to [**] the
         [**] for use in the [**]. The [**] will [**] Aspect BIS Module Kits
         sold by Aspect [**]. The [**] may [**] in [**] depending upon
         negotiations between the Parties (See Exhibit A, Section 1.5).

1.5      The term "Products" shall mean the Aspect BIS Module Kits, the
         Drager-BIS-Modules, the Aspect's BIS Sensors,[**].

1.6      The term "Drager Workplace" shall mean a combination of devices for
         [**] and [**] with a [**] and [**] to all [**]. The definition Drager
         Workplace includes a [**] and a [**] for [**].

2.       DRAGER'S RIGHTS TO PURCHASE AND SELL AND ASPECT'S RESPONSIBILITIES

2.1      Drager shall have the non-exclusive right during the term of this
         Agreement to purchase the Aspect BIS Module Kit for the sole purpose of
         integrating the Aspect BIS Module Kit into a Drager Workplace and
         reselling the finished Drager-BIS-Module worldwide.

         Subject to Clause 2.2 Drager shall have the exclusive right during the
         term of this Agreement to purchase the [**] for the [**] of [**] the
         [**] except in the USA. Aspect shall not have the right to manufacture
         or distribute the [**] to [**].

         Drager shall have the non-exclusive right during the term of this
         Agreement to purchase the Aspect BIS Sensor for the non-exclusive
         resale worldwide except in the USA.

2.2      Drager will sell the Drager-BIS-Module, the [**] and the Aspect BIS
         Sensor through its designated distribution network, and Aspect shall
         not with respect to the Drager-BIS-Module and the [**] make any sales
         promotion, shall not establish any branch, shall not have any supply
         depot or supply the Drager-BIS-Module or [**] to any party other than
         Drager.


<PAGE>   4
                                                 Drager/Aspect Product Agreement
                                                                        20.04.99
                                      - 4 -


     Confidential Materials omitted and filed separately with the Securities
              and Exchange Commission. Asterisks denote omissions.


         It is understood, however, that in the event that Drager distributes
         [**] and [**] customers using [**] of the number of [**] used by [**].
         Drager shall then grant Aspect a non-exclusive royalty-free right and
         license under its rights to the [**] to [**] Aspect BIS Sensors that
         have been [**] for use with [**] to [**].

2.3      Aspect agrees to provide all reasonable help for Drager with respect to
         the design and/or integration of the Aspect BIS Module Kit into a new
         Drager Workplace.

2.4      Drager agrees [**] the [**] for an [**] equipment.

2.5      Aspect shall obtain any official approvals, permits, licenses and other
         consent required to sell Aspect's BIS Module Kit and Aspect's BIS
         Sensor worldwide, at such time and in such manner as determined by
         Aspect or required by Drager to serve reasonable commercial purposes of
         both companies. Drager shall receive copies of any such documents.

         Drager shall obtain any official approvals, permits, licenses and other
         consent required to sell Drager products worldwide, in such time and in
         such manner as determined by Drager. If necessary, Aspect shall receive
         copies of any such documents belonging to the Drager-BIS-Module and the
         [**]. Aspect will provide any reasonable support required by Drager to
         obtain the necessary approvals for the Drager-BIS-Module and the [**].

2.6      The parties intend to agree on a co-marketing concept for the Products.

3.       PRICES

3.1      The prices for Aspect BIS Module Kits and BIS Sensors shall be as set
         forth in Exhibit B hereto. The price per product is FOB, Boston as per
         Incoterms 1990. All prices for Aspect BIS Module Kits and BIS Sensors
         are exclusive of all taxes, levies and assessments imposed on such
         products purchased hereunder, excluding taxes based on Aspect's
         possession thereof prior to the originally scheduled delivery and taxes
         on Aspect's net income from the transaction. Drager intends to
         introduce the new Drager anesthesia workplace to the market [**].


<PAGE>   5
                                                 Drager/Aspect Product Agreement
                                                                        20.04.99
                                      - 5 -


  Confidential Materials omitted and filed separately with the Securities and
                Exchange Commission. Asterisks denote omissions.

3.2      Prices, billing and all payments due hereunder shall be in US$.

3.3      September of each year with effect on 1st January of the following
         year, the prices for Aspect's BIS Module Kit set forth in Exhibit B may
         be adjusted by mutual Agreement. The first adjustment of prices may be
         made prior to October 1, 2002 with effect on January 1, 2003.

         The prices for Aspect's BIS Sensor will be based on the Sensor Price
         Schedule set forth in Exhibit B applied to the prevailing List Price of
         the BIS Sensor in the U.S.

         Any adjustments to BIS Sensor prices may only be made prior to October
         1 of each year for effect on January 1 of the following year. Assuming
         [**] are requested [**] by [**] will be based on the Sensor Price
         Schedule set forth in Exhibit B for the [**] to which will be [**]
         required to [**] the [**] (See also Exhibit A, Section 1.5).

4.       PURCHASE

4.1      All Products shall be ordered in writing, specifying the product type,
         number of units, desired delivery date and means of shipment. Purchase
         orders may be sent by facsimile machine. Such orders shall be
         considered to have been accepted by Aspect only upon Aspect's issuance
         of written acknowledgment confirming its acceptance of the purchase
         order. Aspect's acknowledgment may be sent by facsimile machine and
         shall state delivery date.

4.2      Ownership of, title to, and risk of loss with respect to any product
         sold to Drager hereunder shall pass to Drager upon delivery to carrier
         in Boston packed and ready for shipment to Drager. Aspect shall ship
         products in a manner consistent with Aspect's usual shipping practices.
         Transportation and shipping charges from Boston, including costs
         incurred by Aspect relating to packing, storage, documentation and
         similar items which result from special shipping instructions of
         Drager, and the cost of any insurance which Drager may request in
         connection with the products, shall be added to the price stated on
         invoices and shall be paid by Drager at the time that payment of the
         purchase price for such products is due and payable.


<PAGE>   6
                                                 Drager/Aspect Product Agreement
                                                                        20.04.99
                                      - 6 -


  Confidential Materials omitted and filed separately with the Securities and
                Exchange Commission. Asterisks denote omissions.


4.3      Drager shall have the right to handle the purchase of Products via
         another company belonging to the Drager Group. Drager will inform
         Aspect in writing with respect to such decision. Drager will further
         ensure that this company will adhere to the provisions of this
         Agreement.

5.       FORECAST, DELIVERY TIME

5.1      Drager shall provide a non-binding quarterly rolling forecast for a
         minimum of the successive two quarters.

5.2      Aspect shall ship the Products in lots of [**] units.

5.3      Aspect shall ship Aspect BIS Module Kits within (eight) 8 weeks of its
         receipt of purchase orders therefore, assuming the quantity ordered is
         reasonably consistent with the forecast.

5.4      Aspect shall ship [**] within (four) 4 weeks of its receipt of purchase
         orders therefore, assuming the quantity ordered is reasonably
         consistent with the forecast.

5.5      In the event of cancellation of any purchase order, Drager will be
         liable to Aspect for the payment of reasonable cancellation charges.

6.       PAYMENT; INSPECTIONS; RETURNS

6.1      All purchases hereunder shall be paid within thirty (30) days from date
         of invoice to Drager.

6.2      All Products received by Drager shall conform in all material respects
         to the specifications set forth in Exhibit A.

         Receiving inspection by Drager may be performed on a sampling basis
         which shall be in accordance with the Testing Specifications as
         established in Exhibit C. Exhibit C will be negotiated later.


<PAGE>   7
                                                 Drager/Aspect Product Agreement
                                                                        20.04.99
                                      - 7 -


     Confidential Materials omitted and filed separately with the Securities
              and Exchange Commission. Asterisks denote omissions.

         Acceptance by Drager on a sampling basis shall not prejudice or
         restrict the right of Drager to accumulate and return at Aspect's
         expense for full credit or replacement (freight and insurance prepaid
         to Drager) non-conforming Products discovered during Drager's
         inspection process, which in no event shall extend beyond the warranty
         period provided in Clause 8. Any such return must be made within 30
         days of discovery of any such Products' nonconformance by Drager.

         Aspect must be given the opportunity to inspect and/or correct Products
         for which Drager shall request credit or replacement to enable Aspect
         to determine for itself that said Products do not meet specifications,
         and such credit or replacement shall be made by Aspect only if and when
         it determines that Products do not meet specifications. No Product may
         be returned without Aspect's approval, which, subject to the last
         sentence of the preceding Paragraph under this Clause 6.2, shall not be
         unreasonably withheld.

7.       MODIFICATION OF PRODUCTS

7.1.     Aspect shall inform Drager

         (a)      about planned modifications of Aspect's BIS Module Kit,
                  Aspect's BIS Sensors, [**] and modifications relating to BIS
                  of Aspect's stand alone Monitor,

         (b)      of any modification which will affect the approval of the
                  Products or the Drager Workplace and /or the proper function
                  within the Drager Workplace.

         In case (b), Aspect shall not be allowed to modify Aspect's BIS Module
         Kit, Aspect's BIS Sensor or [**] sold to Drager without Drager's prior
         written consent. Additionally Drager shall have the right to decide if
         Drager wishes to take over the modification. If Drager refuses to take
         over the modification, Aspect shall be obliged to deliver the
         unmodified Aspect BIS Module Kit, Aspect's BIS Sensors and [**] for a
         period of eighteen (18) months beginning with the date Drager announces
         its decision. After this eighteen-months period Aspect can cease to
         deliver the unmodified Aspect BIS Module Kit, Aspect's BIS Sensors or
         [**]. In the event that Aspect believes that a modification or
         improvement relates to patient safety, Drager will accept these
         modifications under the condition that Aspect will agree to repair or
         replace Aspect's BIS Module Kits, Aspect's BIS Sensors or [**]
         previously provided to Drager or Drager customers at no charge.


<PAGE>   8
                                                 Drager/Aspect Product Agreement
                                                                        20.04.99
                                      - 8 -


     Confidential Materials omitted and filed separately with the Securities
              and Exchange Commission. Asterisks denote omissions.

7.2.     Drager shall promptly inform Aspect of any proposed modification which
         will affect Aspect product approval.

7.3      Aspect agrees in principle to [**] of the [**] and [**] the [**] is
         [**]. Aspect and Drager must agree on a mutually-acceptable time
         schedule and on a mutually-acceptable price for the [**] Aspect shall
         own all right title and interest in any [**] to the Aspect BIS Module
         Kit pursuant to this Section 7.3.

8.       WARRANTY

8.1      Subject to Exhibit E, Aspect hereby warrants to Drager that for a
         period of twelve (12) months after each Product is sold by Drager, or
         an authorized Drager Distributor and delivered to an end user, or
         eighteen (18) months after such Products are received from Aspect by
         Drager, whichever period shall be shorter, that such Products will
         conform in all material respects to the specifications set forth in
         Exhibit A and be free from any defects in workmanship and materials. In
         the event of a breach of the warranty under this Section, Aspect's
         responsibility and Drager's remedy shall first be repair or replacement
         of the Product, at Aspect's option. In the event that, after Aspect has
         attempted to repair or replace the product, the Product does not
         conform to the warranty provided in this Section 8.1, Aspect will
         refund the purchase price for such Product. This paragraph summarizes
         Aspect's responsibility and Drager's sole remedy with respect to the
         warranty set forth in this Section 8.1.

8.2      Notwithstanding the foregoing, Aspect's warranty as set forth above
         does not cover:

         (i)      defects emanating from improper or unauthorized use or
                  maintenance of such products by Drager or any subsequent
                  purchaser thereof;

         (ii)     normal deterioration or normal wear and tear;

         (iii)    disposable items such as the [**] Aspect BIS Sensor after the
                  expiration date marked on the Sensor packaging

         (iv)     catastrophe, fault or negligence of Drager or anyone claiming
                  through or on behalf of Drager; or

         (v)      subject to Exhibit A, causes external to the Products
                  including without limitation power or air conditioning
                  failure.


<PAGE>   9
                                                 Drager/Aspect Product Agreement
                                                                        20.04.99
                                      - 9 -


     Confidential Materials omitted and filed separately with the Securities
              and Exchange Commission. Asterisks denote omissions.

8.3      THE PROVISIONS OF THE FOREGOING WARRANTIES ARE IN LIEU OF ANY OTHER
         WARRANTY, WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL (INCLUDING ANY
         WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE).


9.       QUALITY ASSURANCE

         Aspect shall adhere to a quality assurance system in accordance with
         the Quality Assurance Agreement as established in Exhibit D.

10.      SERVICE

10.1     Drager assumes full responsibility to render service with respect to
         the maintenance, repair, or replacement of Products, accessory items,
         or parts therefor sold by Drager.

10.2     Aspect agrees to supply Drager, at Drager's expense, with any and all
         special tools and equipment reasonably required for Drager to service,
         maintain or test the Products sold hereunder. Drager agrees to make
         payment for such items to Aspect within thirty (30) days from the date
         of invoice.

10.3     Aspect shall adhere to the Service Agreement as per Exhibit E. Exhibit
         E will be negotiated later.

11.      TRAINING AND DOCUMENTS

         Aspect personnel shall be made available free of charge for a
         reasonable number of training sessions reasonably required by Drager
         with respect to the sales and application know-how, the maintenance,
         repair or replacement of the Products, or parts therefore.

         Aspect will supply Drager free of charge with a reasonable quantity of
         technical, sales and application materials for internal purposes in
         English and German (if available) such as manuals and other technical
         materials relating to the Aspect BIS Module Kits and Aspect's BIS
         Sensors. Aspect will supply Drager at cost price with a reasonable
         quantity of catalogues and literature relating to the Aspect BIS Module
         Kits and Aspect's BIS Sensors.




<PAGE>   10
                                                 Drager/Aspect Product Agreement
                                                                        20.04.99
                                     - 10 -


     Confidential Materials omitted and filed separately with the Securities
              and Exchange Commission. Asterisks denote omissions.

         Drager agrees to provide, at its own expense, and subject to Aspect's
         prior written approval, translation and printing of technical, sales,
         operation and service materials in the language(s) commonly used in the
         areas where Drager will sell the Products.

         Drager Lubeck will coordinate training and flow of information for all
         Drager participants. Training will be held in English language.

12.      REPLACEMENT PARTS

         Subject to Exhibit E, Aspect agrees to supply Drager with replacement
         parts for the Aspect BIS Module Kits sold hereunder for a period of ten
         (10) years after the date of the last sale of Aspect BIS Module Kits by
         Aspect to Drager hereunder. Prices for the replacement parts will be
         set by Aspect in accordance with Clause 3. Drager shall make payment of
         the replacement parts supplied hereunder within thirty (30) days from
         the date of invoice.

13.      PATENT INDEMNITY

13.1     (a) Except as provided below, Aspect shall defend and indemnify Drager
         from and against any damages, liabilities, costs and expenses
         (including reasonable attorneys' fees) arising out of any claim that
         the Aspect BIS Module, the Aspect BIS Sensor or the [**] infringe a
         valid patent or copyright or misappropriates a trade secret of a third
         party, provided that (i) Drager shall have promptly provided Aspect
         written notice thereof and reasonable cooperation, information, and
         assistance in connection therewith, and (ii) Aspect shall have sole
         control and authority with respect to the defense, settlement, or
         compromise thereof. Should any Product become or, in Aspect's opinion,
         be likely to become the subject of an injunction preventing its use as
         contemplated herein, Aspect may, at its option, (1) procure for Drager
         the right to continue using such product, (2) replace or modify such
         product so that it becomes non-infringing, or, if (1) and (2) are not
         reasonably available to Aspect after consultation in good faith with
         Drager, then (3) terminate Drager's rights to the allegedly infringing
         product and refund to Drager the amount which Drager has paid to Aspect
         for such products which are in the possession of Drager or its
         subdistributors. Drager will immediately inform Aspect as soon as
         Drager becomes aware of any threatened or actual liability claim by a
         third party relating to the Aspect BIS Module, the [**] and the Aspect
         BIS Sensor.


<PAGE>   11
                                                 Drager/Aspect Product Agreement
                                                                        20.04.99
                                     - 11 -


     Confidential Materials omitted and filed separately with the Securities
              and Exchange Commission. Asterisks denote omissions.

         (b) Aspect shall have no liability or obligation to Drager hereunder
         with respect to any patent, copyright or trade secret infringement or
         claim thereof based upon (i) use of the Products by Drager in
         combination with devices or products other than the Drager Workplace,
         (ii) use of the Products in an application or environment for which
         such Products were not designed or contemplated, (iii) modifications,
         alterations or enhancements of the Products not created by or for
         Aspect, or (iv) any claims of infringement of a patent, copyright or
         trade secret in which Drager or any affiliate of Drager has an
         interest. Drager shall indemnify and hold Aspect harmless from all
         costs, damages and expenses (including reasonable attorneys' fees)
         arising from any claim enumerated in clauses (i) through (iv) above,
         provided that (i) Aspect shall have promptly provided Drager written
         notice thereof and reasonable cooperation, information, and assistance
         in connection therewith, and (ii) Drager shall have sole-control and
         authority with respect to the defense, settlement or compromise
         thereof. Aspect will immediately inform Drager as soon as Aspect
         becomes aware of any threatened or actual liability claim by a third
         party relating to Clause (iv) above.

         (c) the foregoing states the entire liability of the Parties with
         respect to infringement of patents, copyrights and trade secrets by the
         Products or any part thereof or by their operation.

13.2     The obligation of the Parties hereto as set forth in this Clause 13
         shall continue notwithstanding the termination of this Agreement.

14.      TRADEMARK

         Any Drager-BIS-Module or [**] sold by Drager under this Agreement shall
         bear the trademark of Drager.

         Drager is required to mark the Drager-BIS-Module and [**] additionally
         to the Drager trademark with the Aspect BIS(TM) trademark as approved
         by Aspect and in accordance with the following provisions:

(a)      Ownership. Drager acknowledges and agrees that Aspect is the sole and
         exclusive owner of all right, title and interest in and to the
         following trademarks (the "Aspect Trademarks"): "Aspect", "BIS", "BIS
         Sensor".

         Drager recognizes the value of the Aspect Trademarks and the good will
         associated with the Aspect Trademarks. Drager agrees that its use of
         the


<PAGE>   12
                                                 Drager/Aspect Product Agreement
                                                                        20.04.99
                                     - 12 -


         Aspect Trademarks and any good will arising therefrom shall inure to
         the benefit of Aspect. Nothing contained herein shall create, nor shall
         be construed as an assignment of, any right, title or interest in or to
         the Aspect Trademarks to Drager, other than the grant of a license in
         Section 14(c) below; it being acknowledged and agreed that all other
         right, title and interest in and to the Aspect Trademarks is expressly
         reserved by Aspect. Drager shall keep the Aspect Trademarks free from
         all liens, mortgages or other encumbrances. Drager agrees that it will
         not attack or otherwise challenge the title, validity or any other
         rights of Aspect in or to the Aspect Trademarks.

(b)      Notice. All Products that use the Aspect Trademarks shall be
         accompanied, where reasonable and appropriate, by a proprietary notice
         with respect to Aspect consisting of the following elements:

         1. The statement "[insert trademark(s)] is a proprietary trademark(s)
         of Aspect."

         2. Drager will include the "(TM)" or "(R)" symbol, as instructed by
         Aspect, a reasonable time before the first prominent use of the Aspect
         Trademark in the Products.

         3. Drager shall reproduce copyright and trademark notices of Aspect in
         the relating documents.

(c)      License. Aspect hereby grants to Drager a nonexclusive, worldwide,
         royalty-free license (without the right to sublicense) to use the
         Aspect Trademarks to designate and promote Products. Drager shall have
         no other right to use, display or utilize the Aspect Trademarks for any
         other purpose or in any other manner.

(d)      Quality Standards. Upon reasonable notice and request, Aspect may
         inspect copies of the Products, advertising and promotional materials
         on which the Aspect Trademarks are used so that Aspect may monitor
         compliance with this Agreement. Quality standards are further described
         in Exhibit D to this Agreement.

(e)      Protection and Infringement. Drager agrees to cooperate with and assist
         Aspect in obtaining, maintaining, protecting, enforcing and defending
         Aspect proprietary rights in and to the Aspect Trademarks. In the event
         that Drager learns of any infringement, threatened infringement or
         passing-off of the Aspect Trademarks, or that any third party claims or
         alleges that the Aspect Trademarks infringe the rights of the third
         party or are otherwise liable to


<PAGE>   13
                                                 Drager/Aspect Product Agreement
                                                                        20.04.99
                                     - 13 -


         cause deception or confusion to the public, Drager shall be required to
         notify Aspect giving the particulars thereof, and Drager shall provide
         necessary information and assistance to Aspect in the event that Aspect
         decides that proceedings should be commenced.

(f)      Termination. In addition to the termination rights set forth in Section
         21 hereof, in the event that Drager is in material breach of any
         provision of this Section 14, Aspect may, upon 30 days written notice,
         terminate the license granted in Section 14(c) if Drager does not cure
         such breach or default within such 30-day period. The parties recognize
         that curing such breach or default may require development of a new
         version of the Product. If this is the case, then Drager will be deemed
         to have cured such breach or default if, within the 30-day cure period,
         Drager presents to Aspect a plan for revision of the Product that will
         cure such breach or default, such plan is reasonably acceptable to
         Aspect, and such revision is released and distributed within three
         months following written notice of such breach or default.

         In addition to the provisions of Section 21 hereof, upon termination of
         the license granted in Section 14(c), or upon termination of this
         Agreement, for whatever cause except Sections 21.5, 21.6 and 21.7:

         1.       Drager shall immediately cease and desist from any further use
                  of the Aspect Trademarks and any trademarks confusingly
                  similar thereto, either directly or indirectly;

         2.       All rights in the Aspect Trademarks granted to Drager
                  hereunder shall immediately revert to Aspect;

         3.       In the event that this Agreement is terminated for any reason
                  other than a material breach or material default by Drager,
                  Drager shall have a period of 30 days thereafter to dispose of
                  all of the unsold Products bearing the Aspect Trademarks and
                  advertising and promotional materials relating thereto which
                  had been completed by it prior to such termination, provided
                  such Products and materials were in the process of manufacture
                  more than 30 days before such termination.





<PAGE>   14
                                                 Drager/Aspect Product Agreement
                                                                        20.04.99
                                     - 14 -


     Confidential Materials omitted and filed separately with the Securities
              and Exchange Commission. Asterisks denote omissions.

15.      PRODUCT RECALL PROGRAM

         In the event of any recall of the Product by Aspect or required by
         Drager for safety or efficacy reasons resulting from Aspect's failure
         to supply any BIS Module Kits, Aspect BIS Sensors, or [**] that (1)
         conform in all material respects to the specifications set forth in
         Exhibit A or (2) are free from defects in workmanship and materials,
         Aspect agrees to repair or replace all recalled Products previously
         supplied to Drager at no expense to Drager. Aspect also agrees to
         consult with Drager to establish a reasonable process for managing the
         recall. Drager will maintain all necessary sales records to facilitate
         the recall.

16.      PRODUCT LIABILITY

16.1     Aspect will indemnify, protect, and save Drager harmless from all
         claims, demands, suit, or actions for damages to property or person
         which may be sustained by any third party, and which are caused by any
         defect or deficiency in the design or manufacture of any of the
         Products sold to Drager under this Agreement.

         The foregoing indemnity shall survive the expiration or termination of
         this Agreement, but Aspect shall not be responsible for any loss or
         damage caused by acts or omissions of Drager. Aspect shall have no
         liability or responsibility of any kind to Drager under this Clause 16
         for any claims, demands, suits, or actions unless Aspect shall have
         been notified within 30 days time following notification to Drager of
         any such claims, demands, suits, or actions and shall have an adequate
         opportunity to defend. Aspect shall have the sole control and authority
         with respect to the defense, settlement or compromise thereof.

         Should Drager desire to have its own counsel participate in any such
         action or suit, the cost of such counsel shall be borne exclusively by
         Drager. The obligation of the Parties set forth in this Clause 16 shall
         continue notwithstanding the termination of this Agreement.



<PAGE>   15
                                                 Drager/Aspect Product Agreement
                                                                        20.04.99
                                     - 15 -


     Confidential Materials omitted and filed separately with the Securities
              and Exchange Commission. Asterisks denote omissions.

16.2     Drager will indemnify, protect, and save Aspect harmless from all
         claims, demands, suit, or actions for damages to property or person
         which may be sustained by any third party and which are caused by any
         defect or deficiency in the design or manufacture of the Drager
         Workplace or of that portion of the Drager-BIS-Module developed or
         manufactured by Drager, or which relate to the failure of Drager to
         incorporate the Aspect BIS Module Kit within the Drager-BIS-Module in
         accordance with the technical information provided by Aspect, or
         Drager's activities in connection with use or sale of the Products.

         The foregoing indemnity shall survive the expiration or termination of
         this Agreement, but Drager shall not be responsible for any loss or
         damage caused by acts or omissions of Aspect. Drager shall have no
         liability or responsibility of any kind to Aspect under this Clause 16
         for any claims, demands, suits, or actions unless Drager shall have
         been notified within [**] time following notification to Aspect of any
         such claims, demands, suits, or actions and shall have an adequate
         opportunity to defend. Drager shall have sole control and authority
         with respect to the defense, settlement or compromise thereof.

         Should Aspect desire to have its own counsel participate in any such
         action or suit, the cost of such counsel shall be borne exclusively by
         Aspect. The obligation of the Parties set forth in this Clause 16 shall
         continue notwithstanding the termination of this Agreement.

17.      [**] PROJECT

17.1     It is Drager's intention that the Product will become the [**] for
         monitoring the level of hypnosis in Drager anesthesia Workplaces and it
         is [**] of the [**]. However, Drager shall be free to provide
         alternative technology in the event that

         (i)      necessary regulatory approvals for the Products are withdrawn
                  and will not be granted during a [**] period after withdrawn,

         (ii)     approvals have not been granted within a period of [**]
                  following the completion of the Drager-BIS-Module and
                  submission of the necessary requests for approvals to the
                  appropriate regulatory agencies

         (iii)    Aspect is unable to supply Aspect BIS Module Kits in
                  accordance with the specifications and is unable to
                  reinstitute supply within [**] days of written notification

<PAGE>   16
                                                 Drager/Aspect Product Agreement
                                                                        20.04.99
                                     - 16 -


     Confidential Materials omitted and filed separately with the Securities
              and Exchange Commission. Asterisks denote omissions.

         (iv)     Aspect's market share worldwide for monitoring the effect of
                  anesthesia on the brain with BIS [**].

         (v)      Aspect stops or reduces marketing and product improvement
                  activities materially below the level currently performed.

17.2     Drager may offer in Drager anesthesia workplaces and in other Drager
         products complementary parameters [**] to Aspect's Bispectral Index.
         Any parameter claimed to be a measure of the hypnotic effect of
         anesthetics based on processing of the continuous EEG, is considered to
         be [**] will only be [**] to the BIS.

         Notwithstanding the foregoing, Drager is free to offer EEG parameters
         based on the continuous EEG such as median frequency, spectral edge
         frequency, compressed spectral array (CSA) and/or density spectral
         array (DSA), and may also offer evoked potentials, in addition to the
         BIS.

17.3     In the event that the Aspect's BIS Module Kit sold to Drager contains
         applications unique to Drager Aspect shall for the term of this
         Agreement and for [**] after its termination refrain from selling
         similar products to any third party.

18.      FORCE MAJEURE

         Neither Aspect nor Drager shall be liable for any delay in, or failure
         of, performance hereunder due to any contingency reasonably beyond its
         control, rendering performance commercially unreasonable including, but
         not limited to, an act of God, war (declared or undeclared),
         mobilization, riot, strike, labor dispute, fire, flood, shortages, or
         failure or delays of energy, materials, supplies or equipment,
         unavailability of transportation, goods or services, transportation
         embargoes or delays, or breakdowns in machinery or equipment,
         governmental restrictions or actions but shall not include any royalty
         or other payment imposed or agreed to by Aspect or Drager resulting
         from a third party claim of intellectual property right infringement or
         violation as further described in Clause 13; provided, however, that
         the Party affected shall exert its reasonable best efforts to eliminate
         or cure or overcome any of such causes and to resume performance of its
         covenants.




<PAGE>   17
                                                 Drager/Aspect Product Agreement
                                                                        20.04.99
                                     - 17 -


19.      SECRECY

19.1     If marked as "Confidential Information", Drager and Aspect are each
         obliged to preserve in strict confidence any trade secrets,
         confidential information and technical information of the other Party
         and to refrain from disclosing, during the period of this Agreement and
         any time after expiration of this Agreement, any such information to
         third parties. Notwithstanding the foregoing, information which is
         orally or visually disclosed to the recipient by the disclosing party,
         or is disclosed in writing without an appropriate letter, proprietary
         stamp or legend, shall constitute Confidential Information if the
         disclosing party, within thirty (30) days after such disclosure,
         delivers to the recipient a written document or documents describing
         such Confidential Information and referencing the place and date of
         such oral, visual or written disclosure and the names of the employees
         or officers of the recipient to whom such disclosure was made.

         Both Parties represent and warrant that they have exercised, and will
         continue to exercise the same standard of due care in hiring,
         supervising and selecting those employees to whom they disclose such
         confidential information, so that the confidentiality of all such
         information is protected. No such confidential information disclosed by
         either party to the other in connection with this Agreement shall be
         disclosed to any person or entity other than the recipient's employees
         and contractors directly involved with the recipient's use of such
         information who are bound by written agreement to protect the
         confidentiality of such information, and such information shall be
         otherwise protected by the recipient from disclosure to others with the
         same degree of care accorded to its own proprietary information.

19.2     The Parties' obligation of non-disclosure shall not apply with respect
         to such information, which

         (1)      is already known to the receiving Party before disclosure by
                  the divulging Party, providing that the receiving Party has
                  written records to substantiate its knowledge; or

         (2)      is in the public domain at the time of disclosure to the
                  receiving Party or, after such disclosure, enters into the
                  public domain through no fault of the receiving Party;

         (3)      is independently developed by the receiving Party without
                  reference to or reliance on the Confidential Information; or


<PAGE>   18
                                                 Drager/Aspect Product Agreement
                                                                        20.04.99
                                     - 18 -



         (4)      is lawfully disclosed to the receiving Party by a third party
                  under circumstances permitting its unrestricted disclosure by
                  the receiving party.

         Upon termination of this Agreement, each party shall promptly deliver
         to the other all confidential information of the other party in the
         possession or control of such party and all copies thereof. The
         obligations under this Section 19 shall continue for both parties for a
         period of 3 years after delivery by Aspect to Drager of the last
         Product under this Agreement.

20.      RELATIONSHIP BETWEEN THE PARTIES

         During the term hereof, the relationship of the Parties is that of
         seller (Aspect) and buyer (Drager).

         Nothing herein contained shall be deemed to authorize or empower either
         Party, its affiliates, its agents or employees, to act as agent for the
         other Party or conduct business in the name, or for the account of the
         other Party or any of its affiliates or otherwise bind it or them in
         any manner.

21.      TERM AND TERMINATION

21.1     This Agreement shall come into force when it has been duly signed by
         both Parties and shall remain in force until December 31, 2005, unless
         earlier terminated in accordance with the provisions hereof.

         It shall be automatically renewed thereafter for additional periods of
         one (1) calendar year each unless one Party gives at least twelve (12)
         calendar months prior to the end of the original term hereof and each
         one (1) year period thereafter a written notice to the other Party of
         its intention to terminate. First notice of termination may not be
         given until [**].



<PAGE>   19
                                                 Drager/Aspect Product Agreement
                                                                        20.04.99
                                     - 19 -


     Confidential Materials omitted and filed separately with the Securities
              and Exchange Commission. Asterisks denote omissions.

21.2     Aspect shall have the right to terminate this Agreement, effective upon
         the delivery of written notice to Drager, in the event Drager fails to
         make any payment when due to Aspect pursuant to this Agreement or any
         invoice for Products. Aspect will [**] to Drager after Drager's receipt
         of Aspect's written demand for payment, provided Aspect has submitted
         proof of delivery in order to rectify any payment problem or
         discrepancy and has stated that the Agreement will be terminated if
         Drager fails to make the due payment within the [**].

21.3     Furthermore, either Party may terminate this Agreement if the other
         Party commits any material breach of its obligations hereunder (other
         than payment defaults addressed in Clauses 21.2 hereof) and such breach
         is not resolved within [**] after written notice thereof is given to
         the Party in breach of this Agreement.

21.4     Should Drager or Aspect at any time during the period of this Agreement
         be adjudged bankrupt or insolvent, or have a Receiver appointed in
         respect of its assets or shall make any arrangement or composition with
         its creditors or shall be wound up, whether voluntarily or
         compulsorily, or make a general assignment for the benefit of
         creditors, then in such event the other Party may, at its option,
         terminate this Agreement effective upon giving notice thereof in
         writing to the other. In the event either Drager or Aspect exercises
         this option, said Party shall incur no liability or obligation with
         respect to said termination.

21.5     In the event of the merger, consolidation or sale of substantially all
         assets of Aspect to a competitor of Drager, Drager may, at its option,
         terminate Section 17 of this Agreement effective upon giving notice
         thereof in writing to Aspect. In the event Drager wishes to exercise
         this option, Drager shall do so within 30 days following written notice
         from Aspect of the merger, consolidation or sale of substantially all
         assets of Aspect, and neither Aspect (or its successors) or Drager
         shall incur liability or obligation with respect to said termination.

         In the event of the merger, consolidation or sale of substantially all
         assets of Drager to a company outside of the Drager-Group, Aspect may,
         at its option, terminate this Agreement effective upon giving notice
         thereof in writing to Drager. In the event Aspect exercises this
         option, Aspect shall do so within 30 days following written notice from
         Drager of the merger, consolidation or sale of substantially all assets
         of Drager, and neither Drager (or its successors) or Aspect shall incur
         liability or obligation with respect to said termination.


<PAGE>   20
                                                 Drager/Aspect Product Agreement
                                                                        20.04.99
                                     - 20 -


     Confidential Materials omitted and filed separately with the Securities
              and Exchange Commission. Asterisks denote omissions.


21.6     Subject to the second paragraph of this Section 21.6, in the event of
         termination the Parties agree that Drager shall have the right to
         purchase the Aspect BIS Module Kit and the [**] for [**] following
         termination of the Agreement or Aspect BIS Sensors for [**] following
         termination of the Agreement.

         In the event of termination of the Agreement as a result of a material
         breach of the Agreement by Drager in accordance with Sections 21.2 or
         Section 21.3, Drager shall not be permitted to continue to purchase
         [**] Aspect BIS Sensors beyond [**] termination of the Agreement. If
         Aspect intends to [**] of the [**] the Parties shall [**] in good
         faith.

21.7     In the event of termination, the Parties further agree to finalize
         current sales projects. A complete list of these sales projects has to
         be exchanged by the Parties no later than fourteen (14) days after the
         termination.

21.8     Due to the fact that some Exhibits of this Agreement will be negotiated
         later each Party shall have the right to terminate this Agreement if
         the parties cannot reasonably agree on the content of one of these
         Exhibits.

22.      MISCELLANEOUS

22.1     This Agreement shall not be assignable either in whole or in part
         without the prior written consent of the other Party except, subject to
         Section 21.5, to a party that acquires all or substantially all of
         either Parties' business by merger, sale of assets, or otherwise.

22.2     Subject to Clause 21.1 hereof, this Agreement shall inure to the
         benefit of and be binding upon the Parties hereto.

22.3     The headings used herein are for ease of reference only and are not to
         be used in interpretation or construction of this Agreement.

22.4     The provisions of this Agreement and its Exhibits shall not be
         extended, varied, changed, modified or supplemented other than by
         agreement in writing signed by the Parties hereto.

22.5     In the event of any inconsistency or conflict between the provisions of
         this Agreement and any Purchase Order or other document, the provisions
         of this Agreement shall prevail.


<PAGE>   21
                                                 Drager/Aspect Product Agreement
                                                                        20.04.99
                                     - 21 -



22.6     All notices or other communications which shall or may be given
         pursuant to this Agreement shall be in writing in the English language
         and shall be delivered by personal delivery, certified mail, or telefax
         at the address set forth below, or at such other address as such party
         may hereafter designate in writing as the appropriate address for the
         receipt of such notice.

           To Aspect at:

              Aspect Medical Systems, Inc.
              2 Vision Drive
              Natick
              MA 01760-2059
              USA
              Tel.: 508-647-2072
              Fax:   508-647-2059
              Attention: J.Breckenridge Eagle

           To Drager at:

              Drager Medizintechnik GmbH
              Moislinger Allee 53 - 55
              D-23558 Lubeck
              Federal Republic of Germany
              Tel.:  451-882-2295
              Fax:   451-882-2793
              Attention: Business Unit Anaesthesia, Swen Grunitz-Post

         All notices shall be deemed served on the day on which personally
         served, or of by certified mail, or telefax on the date of actual
         receipt.

21.7     The waiver by either Party hereto of any default hereunder or of any
         breach of any covenant, agreement or condition contained herein shall
         not be construed to constitute a waiver of any other default or breach
         hereof whether similar or otherwise.

22.8     If any provision of this Agreement should be held unenforceable, or
         illegal with respect to any jurisdiction, it (i) shall be deemed
         severable from the other provisions which shall remain valid and
         enforceable; and (ii) shall remain in effect in other jurisdiction
         where such provision is otherwise enforceable and legal.



<PAGE>   22
                                                 Drager/Aspect Product Agreement
                                                                        20.04.99
                                     - 22 -


         This Agreement may be executed simultaneously in multiple counterparts,
         each of which shall be deemed an original and all of which together
         shall constitute one and the same agreement.

22.10    Neither party shall have the right to sublicense any of the rights or
         licenses granted under this agreement outside the company group without
         the other's prior written consent.

21.11    Compliance with Laws. Drager shall comply with all laws, legislation,
         rules, regulations, governmental requirements and industry standards
         with respect to the Products, and the performance by Drager of its
         obligations hereunder, existing in any jurisdiction into which Drager
         directly or indirectly distributes the Products. Aspect shall inform
         Drager if export of Aspect's BIS Module Kit or Aspect's Sensors are
         restricted to any country or require certain permission in any country.

21.12    IN THE EVENT THAT U.S. LAW IS APPLIED TO THIS AGREEMENT, ASPECT OR
         DRAGER SHALL NOT BE LIABLE FOR ANY LOSS OF DATA, LOSS OF PROFITS OR
         LOSS OF USE OF THE PRODUCTS OR FOR ANY INDIRECT DAMAGES OF ANY KIND
         (WHETHER SPECIAL, INCIDENTAL, CONSEQUENTIAL OR OTHER INDIRECT DAMAGES)
         IN CONNECTION WITH THE USE OR PERFORMANCE OF THE PRODUCTS.

23.      APPLICABLE LAW

         This Agreement shall be governed, construed and interpreted in
         accordance with the laws of Switzerland, without regard to its conflict
         of laws principles.

         The United Nations Convention on contracts for the International Sale
         of Goods shall not apply.

24.      DISPUTE SETTLEMENT, PLACE OF JURISDICTION

24.1     The Parties shall try to settle any dispute arising in connection with
         this present Agreement amicably. In case of a local sales conflict a
         task force of Drager and Aspect consisting of the persons named under
         Clause 22.6 will take care of such dispute settlement.

24.2     In the event disputes cannot be settled amicably according to Clause
         24.1, in connection with this present Agreement shall be exclusively
         and finally settled by the courts of Zurich.

Natick, ......April 29, 1999.....       Lubeck, .......May 5, 1999..............

J. Breckenridge Eagle                   [Illegible]
 .................................       ........................................
Aspect Medical Systems, Inc.            Drager Medizintechnik GmbH



<PAGE>   23
                                                 Drager/Aspect Product Agreement
                                                                        20.04.99
                                     - 23 -


     Confidential Materials omitted and filed separately with the Securities
              and Exchange Commission. Asterisks denote omissions.

EXHIBIT A


of the               Drager/Aspect Product Agreement
between              Aspect Medical Systems, Inc.
and                  Drager Medizintechnik GmbH


Products

1.1      The Drager-BIS-Module will incorporate Aspect's BIS Module Kit.

         Aspect's BIS 'Module Kit' is designed specifically for OEM applications
         and allows the integration of Aspect's BIS monitoring technology into
         OEM equipment. The BIS Engine will interface to the patient via the
         Aspect BIS sensor and to the OEM equipment utilizing a serial (RS-232)
         3-wire interface and the necessary power connections.

         The BIS Module Kit consists of a Digital Signal Converter (DSC-2) that
         is placed in proximity to the patient and a small circuit board that
         resides in the OEM equipment. The DSC-2 is a small (palm sized)
         front-end to the BIS Engine circuit board that provides the patient
         interface and performs the high performance analog to digital
         conversion of the EEG signals. The EEG signals are transmitted in
         digital format from the DSC-2 to the BIS engine circuit board via a 12
         foot cable that is hard wired connected at the DSC-2.

         The BIS Engine circuit board measures 3 x 4 inches. This board performs
         digital signal processing on the digitized EEG signal and outputs the
         Bispectral Index to the OEM system via the RS-232 serial connection.
         The board is constructed using double sided surface mount techniques.
         The connections to the BIS Engine circuit board are a serial interface
         (RS-232), power, and DSC connections.



<PAGE>   24

                                                 Drager/Aspect Product Agreement
                                                                        20.04.99

     Confidential Materials omitted and filed separately with the Securities
              and Exchange Commission. Asterisks denote omissions.



                                     - 24 -


       Detailed Technical Specifications:

       Digital Output:             [**]

       Main Parameters:            [**]

       Electrical Safety:          [**]

       Power:                      [**]

       Artifact Rejection:         [**]

       Bispectral Index:           [**]


       Digital Signal Converter (DSC-2)

       Description:                [**] to the [**]

       Weight:                     [**]

       Dimensions:                 [**]

       Cable Length:               [**]


       BIS Engine PCB

       Physical:                   [**]

       Processing Power:           [**]


       Software Upgrades
       [**] software is stored in [**]. Software upgrades can be accomplished
       [**] via the [**].


       Serial Identifier
       Each [**] serial identifier. This allows for [**].




<PAGE>   25
                                                 Drager/Aspect Product Agreement
                                                                        20.04.99
                                     - 25 -



     Confidential Materials omitted and filed separately with the Securities
              and Exchange Commission. Asterisks denote omissions.

                  [Graphic of Aspect BIS Module Kit and Sensor]

1.2      In addition to the main parameters indicated in Exhibit A, Section 1.1,
         the Aspect BIS Module Kit shall also provide the [**].

         When the Drager-BIS-Module is in use in a Drager Workplace System,
         there will be a possibility to display each of the following [**] as
         well as the [**] in the [**] when used for [**] and in [**].

1.3      Aspect shall ensure that all BIS enhancements that Aspect develops for
         Aspect's stand alone BIS monitor will be available in the BIS Module
         Kit sold to Drager as appropriate and as soon as reasonably possible.

         Drager will agree to distribute a modified BIS Sensor in the event
         Aspect determines that an enhancement to the BIS Module Kit requires
         the use of a modified Sensor. All conditions, prices and so on won't be
         changed for the new sensors. If this occurs, and if [**] in accordance
         with Section 1.5 of Exhibit A, [**] to provide a [**] of the [**] for
         the [**] use of [**]. Possible additional costs will be incorporated in
         the transfer price for the [**] and reasonable volumes will be
         required.

         In the event that Aspect develops a different product involving a
         different type of index, patient sensor, or application, Aspect and
         Drager will develop a mutually-satisfactory new, or amended, agreement.

1.4      For integration into a Drager Workplace, Drager will design an Drager
         Workplace specific Drager-BIS-Module. Aspect will grant all reasonable
         help to Drager designing the Drager-BIS-Module.

1.5      On the [**]. The possibility to use [**] the original Aspect BIS
         monitor will be negotiated later. Possible additional costs [**] will
         be incorporated in the transfer price and [**] will be required.

1.6      Both Parties agree to work out a common technical requirement
         specification for the Products. The latest version of this technical
         requirement specification signed by both Parties will be the
         specification of the Product to be manufactured by Aspect for Drager.

Natick, .....4/29/99.............       Lubeck, .........May 5, 1999 ...........

J. Breckenridge Eagle                   [illegible]
 .................................       ........................................
Aspect Medical Systems, Inc.            Drager Medizintechnik GmbH


<PAGE>   26
                                                 Drager/Aspect Product Agreement
                                                                        20.04.99
                                     - 26 -



     Confidential Materials omitted and filed separately with the Securities
              and Exchange Commission. Asterisks denote omissions.


         EXHIBIT B


         of the                    Drager/Aspect Product Agreement
         between                   Aspect Medical Systems, Inc.
         and                       Drager Medizintechnik GmbH


         PRICES AND DISCOUNTS

         The price for one Aspect BIS Module Kit is US$[**].

         The components consists of a [**] and [**] and a [**] and [**].

         Drager shall have the right to manufacture on a royalty free basis the
         circuit board based on design specifications provided by Aspect. In
         this case the price for the remaining components is US$[**] for one
         Aspect BIS Module Kit. The Parties will agree in the future on the
         terms of a manufacturing license.

         The price of the Aspect BIS Module Kit always includes 5 Sensors.
         Drager agrees to supply these Sensors together with each
         Drager-BIS-Module to its customers.

         The Parties agree that Aspect will grant to Drager an additional
         discount on the price of the Aspect BIS Module Kit depending on a
         certain yearly quantity : Aspect will grant an additional discount of
         [**] for a yearly quantity of more than [**] Aspect BIS Module Kits.

         Aspect [**] the [**] subsequent to the date of this agreement, for
         products sold by Aspect [**] to other customers of Aspect [**]. Aspect
         will provide Drager with a [**] to [**] that [**] by other Aspect
         customers.

         The price to Drager for the Aspect-BIS-Sensor will be as follows:

         The transfer price to Drager for the Aspect BIS Sensor will vary
         between[**] of the List Price of the Aspect BIS Sensor in the United
         States. This is equivalent to a discount off of Aspect's List price in
         the United States for the BIS Sensor between [**].


<PAGE>   27
                                                 Drager/Aspect Product Agreement
                                                                        20.04.99
                                     - 27 -


     Confidential Materials omitted and filed separately with the Securities
              and Exchange Commission. Asterisks denote omissions.


         As of January 1, 1999, the List Price for Aspect's BIS Sensor is
         US$15.00 The actual amount of the discount off the U.S. List Price will
         depend upon the volume of Aspect BIS Sensors shipped by Drager for use
         with Drager-BIS-Modules. Prior to the shipment by Drager of the first
         [**]Drager-BIS-Modules, the discount available to Drager for purchase
         of the Aspect BIS Sensors will be set at [**] of Aspect's List Price
         for the BIS Sensor in the United States. Following the shipment of the
         first [**] Drager-BIS-Modules, the discount available to Drager will
         depend upon the volume of Aspect BIS Sensors shipped each quarter
         divided by the number of documented Drager-BIS-Modules installed minus
         the first [**] Drager-BIS-Modules installed. Using this formula, the
         Aspect BIS Sensor price schedule is as follows:

Sensor Shipments per module per quarter-Note 1        Discount off US List price
- ----------------------------------------------        --------------------------

  up [**]                                             [**]
   [**]                                               [**]
   [**]                                               [**]
   [**]                                               [**]
   [**]                                               [**]
   [**]                                               [**]
or more [**]                                          [**]

Note 1: Sensor consumption rate calculated based on total Aspect BIS Sensors
shipped during the quarter divided by the average Drager-BIS Module installed
base during the quarter minus [**].

In the event that Drager requests that Aspect develop the Drager-BIS-Sensor,
Aspect will sell Drager-BIS-Sensors to Drager in accordance with the same
discount schedule as above, with possible additional costs as noted in Section
1.5 of Exhibit A.

According to Clause 2.1 of the Agreement Drager shall not distribute Sensors in
the USA. Therefore, Aspect will pay a commission to Drager of [**] of the
amounts paid by the customer for each Sensor shipped for use with a
Drager-BIS-Module in the USA.



 Natick, .......4/29/99 ............           Lubeck, ......May 5, 1999  ......

 J. Breckenridge Eagle                         [illegible]
 ...................................           .................................
 Aspect Medical Systems, Inc.                  Drager Medizintechnik GmbH

<PAGE>   28
                                                 Drager/Aspect Product Agreement
                                                                        20.04.99
                                     - 28 -




EXHIBIT C


of the                    Drager/Aspect Product Agreement
between                   Aspect Medical Systems, Inc.
and                       Drager Medizintechnik GmbH



TESTING SPECIFICATIONS FOR THE PRODUCTS



(to be negotiated later)




Natick, .......4/29/99 ................   Lubeck, ......May 5, 1999  .......

J. Breckenridge Eagle                     [illegible]
 .......................................   ..................................
Aspect Medical Systems, Inc.              Drager Medizintechnik GmbH




<PAGE>   29
                                                 Drager/Aspect Product Agreement
                                                                        20.04.99
                                     - 29 -



EXHIBIT D


of the                    Drager/Aspect Product Agreement
between                   Aspect Medical Systems, Inc.
and                       Drager Medizintechnik GmbH




QUALITY ASSURANCE AGREEMENT





(to be negotiated later)








Natick, .......4/29/99 .................         Lubeck, ......May 5, 1999  ....

J. Breckenridge Eagle                            [illegible]
 ........................................         ...............................
Aspect Medical Systems, Inc.                     Drager Medizintechnik GmbH

<PAGE>   30
                                                 Drager/Aspect Product Agreement
                                                                        20.04.99
                                     - 30 -

EXHIBIT E


of the        Drager/Aspect Product Agreement
between       Aspect Medical Systems, Inc.
and           Drager Medizintechnik GmbH


SERVICE AGREEMENT





(to be negotiated later)













Natick, .......4/29/99 .................         Lubeck, ......May 5, 1999  ....

J. Breckenridge Eagle                            [illegible]
 ........................................         ...............................
Aspect Medical Systems, Inc.                     Drager Medizintechnik GmbH

<PAGE>   1
                          Aspect Medical Systems, Inc.
has requested that the marked portions of this agreement be granted confidential
  treatment pursuant to Rule 406 under the Securities Act of 1933, as amended.

                                                                    Exhibit 10.7

                          ASPECT MEDICAL SYSTEMS, INC.

                     OEM DEVELOPMENT AND PURCHASE AGREEMENT

         Agreement dated this Sixth day of August, 1999 , by and between Aspect
Medical Systems, Inc, a Delaware corporation with its principal offices located
at Two Vision Drive, Natick, Massachusetts ("Aspect") and Hewlett-Packard GmbH
("HP"), a German corporation with its principal offices located in Germany at
71034 Boblingen, Herrenberger Str. 110-140, for the purchase and/or license by
HP of products under the terms and conditions contained in this Agreement.

1.   BACKGROUND.

          (a)  Aspect is a developer, manufacturer and distributor of medical
               devices, equipment, accessories and related hardware, software
               and related products and accessories.

          (b)  HP is a manufacturer of medical equipment, in particular of
               multiparameter patient monitors.

          (c)  Aspect and HP intend to make available to HP customers a solution
               to integrate Aspect's BIS technology with HP's patient monitors.
               In a first phase of the cooperation Aspect and HP will develop
               appropriate components in a joint project (the "BIS Project").
               In the second phase of the cooperation, HP intends to purchase
               and/or license specified products for integration with its own
               systems and products. Aspect agrees to sell and/or license to HP
               the products described below, subject to the terms and conditions
               contained in this Agreement.

          (d)  It is the intention of both Parties to negotiate a separate,
               independent distribution agreement (the "Distribution Agreement")
               under which HP will also sell the Aspect 2000 BIS Monitor and
               Aspect BIS Sensors in certain geographies.

2.   DEFINITIONS.

          "Aspect's Bispectral Index" or "BIS" is Aspect's proprietary processed
          EEG parameter that measures the hypnotic effects of anesthetic and
          sedative agents on the brain during surgery.

          "HP Patient Monitors" means a family of multi-parameter modular
          patient monitoring systems manufactured by or for HP. When the HP BIS
          System is complete, HP Patient Monitors will display BIS data
          (waveforms, numerics, status info), and provide setup and operation
          information (user interface), alarming, and network connectivity.

          "HP BIS System" is the sum of all components involved in integrating
          the BIS with HP Patient Monitors.

                                        1


<PAGE>   2
          "HP BIS Module" is a standard size parameter module for HP Patient
          Monitors to convert the data as delivered by the HP BIS Engine from
          the BIS Protocol to the HP Patient Monitor's internal format.

          "Module Cable" is a cable used to connect the HP BIS Engine to the HP
          BIS Module.

          "DSC Cable" is a cable used to connect the Digital Signal Converter to
          the HP BIS Engine.

          "HP BIS Engine" is the processing unit for deriving the BIS data from
          the raw EEG signal and consists of Aspect's "BIS Engine" board
          modified for HP and built into a housing with appropriate connectors
          to connect to the DSC Cable and the Module Cable.

          "Digital Signal Converter" (or "DSC") is used to amplify the analog
          EEG signals as acquired by the BIS sensors and convert it from analog
          to digital signals.

          "Aspect BIS Module Kit" means the bundle of all components of the HP
          BIS System that are developed and manufactured by Aspect and
          licensed/sold to HP under this Agreement: DSC, DSC Cable, HP BIS
          Engine, and Module Cable.

          "Aspect BIS Sensor" means a single use disposable sensor manufactured
          by Aspect for use with the Aspect A2000 BIS monitor or with the Aspect
          BIS Module Kit and that is required to generate Aspect's Bispectral
          Index.

          "Sensor Startup Kit" is a set of Aspect BIS Sensors that may be part
          of each HP BIS System sale by HP in selected geographies outside North
          America.

          "A2000" means Aspect's stand-alone BIS monitor for use with the Aspect
          BIS Sensor and that generates Aspect's Bispectral Index.

          "Aspect Products" means Aspect BIS Module Kits and any other product
          that can be ordered by HP as listed in Exhibit A (Aspect Products and
          Purchase Prices).

          "Software" means Aspect software programs in binary code form which
          are designed for use with the Aspect BIS Module Kit.

          "BIS Protocol" is Aspect's proprietary communication protocol provided
          for purposes of communication between the HP BIS Engine, the HP BIS
          Module and HP Patient Monitors

          "Documentation" means the BIS Engine Serial Interface Specification.

          "Territory" shall mean all countries in which HP is permitted under
          this Agreement to distribute Aspect Products.

          "Party" or "Parties" shall mean Aspect and HP each individually or
          jointly.

                                        2


<PAGE>   3


          Confidential Materials omitted and filed separately with the
          Securities and Exchange Commission. Asterisks denote omissions.

3.   BIS MODULE DEVELOPMENT PROJECT.

     3.1. PROJECT SCOPE

          (a)  Aspect and HP will be performing activities to develop a HP BIS
               System. Aspect will modify Aspect's standard BIS Engine product
               described in Exhibit B to create a HP BIS Engine. HP will develop
               a HP BIS Module to interface with Aspect's modified BIS Engine.

          (b)  The following specifications/documents will be created and agreed
               upon by both parties prior to completion of Phase 1 of the Module
               Development Project:

               -    Functional Technical Specification (FTS): This is a
                    specification that defines the interface between the HP BIS
                    Engine and the HP BIS Module. This document is an HP
                    specification that is derived principally from
                    specifications and materials from Aspect.

               -    System Hazard Analysis: To be performed in Phase 1 of the
                    project.

               -    External Specification: Specification describing the HP BIS
                    Module and the Aspect BIS Module Kit as a system from the
                    customer's viewpoint.

               -    Project Plan: The project plan will include a detailed
                    project schedule, detailed project description, and other
                    information not included in the FTS.

     3.2. PROJECT TIMING

The overall project duration is expected to be approximately [**]. The product
introduction is planned for [**]. The expected major project milestones are
described below:

August, 99        Start Project - Phase 1 - Definition
Dec, 99           Start Phase 2A - Specification

     3.3. PROJECT PHASE DESCRIPTIONS

The following phases of the project closely correlate with the standard internal
project phases of the HP development process.

                                        3


<PAGE>   4


          Confidential Materials omitted and filed separately with the
          Securities and Exchange Commission. Asterisks denote omissions.

PHASE 1: PROJECT DEFINITION

Phase 1 defines the project at a high level.

The principal technical issues to resolve are the [**] requirements and the [**]
requirements for the [**].

At the end of Phase 1 the following documents are created: External
Specification (preliminary), Functional Technical Specification (preliminary),
an initial Hazard Analysis, and a detailed Project Schedule., In addition, HP
shall create internal Functional Plans, including a development plan,
verification and validation plan, manufacturing plan, marketing plan,and
regulatory plan.

PHASE 2A: SPECIFICATION

In Phase 2A the detailed design specifications are created: External
Specification (Final), Technical Specification (Final), Hazard Analysis (Final)
and definition of Aspect's Qualification Test Procedure (verification and
validation plan for all items identified under the Functional Technical
Specification).

PHASE 2B: DESIGN (IMPLEMENTATION)

The actual electrical, circuit schematics, and mechanical design and
implementation is performed in Phase 2B. The output of Phase 2B is a functional
prototype. This functional prototype is intended to be a faithful representation
of the product, including actual molded materials, electronics and software.
During this phase, the Outgoing Inspection Procedure from Aspect is also
defined.

PHASE 3: VERIFICATION

Design verification testing of software, electronics and mechanical components
is performed in Phase 3. Additionally EMI testing of the system is performed in
this phase of the project. Aspect will perform an [**] of the [**] as a [**]
with the BIS Module.

Clinical field trials are started in Phase 3. It is anticipated that field
trials of the BIS Module System will be conducted in [**] hospitals in Europe
and [**] hospitals in the US. The completion of field trials occurs by the end
of Phase 4.

During this phase, results of the Qualification Tests and Outgoing Inspection
will also be reviewed for all prototypes.

PHASE 4: VALIDATION

The following tasks are accomplished during Phase 4: Software Validation: Formal
validation testing of the BIS Module System.

                                        4


<PAGE>   5


          Confidential Materials omitted and filed separately with the
          Securities and Exchange Commission. Asterisks denote omissions.

Manufacturing Pilot Build: It is expected that [**] systems will be built, of
which [**] units will be required at the beginning of Phase 3 for clinical field
trials. The systems will be used for clinical trials, engineering test, and for
sales demos. Final Test Procedure: Used to 100% test the Aspect BIS Module Kit
and HP BIS Module as a final test in manufacturing.

     3.4 PROJECT MANAGEMENT.

          (a)  Each party shall appoint a "Project Manager" who oversees and
               manages the joint project on a day-to-day basis.

          (b)  The Project Managers shall meet regularly based on the project
               needs to assess the project status and discuss and resolve any
               issues or problems. These meetings may be held face-to-face or as
               telephone or video conferences.

          (c)  Both Parties' project teams shall conduct project meetings from
               time to time as deemed useful.

          (d)  Each Party shall bear its own communication and travel costs.

          (e)  All communication in conjunction with this Agreement shall be
               directed to the appropriate person and address as listed in
               Exhibit C (Contact Persons/Addresses).

     3.5. JOINT RESPONSIBILITIES.

          (a)  Both Parties will actively work together in performing a joint
               Hazard Analysis for the HP BIS System at the beginning of the BIS
               Project.

          (b)  Both Parties will generate a joint External Specification of the
               HP BIS System.

          (c)  The parties will jointly develop and agree on a Verification and
               Validation Plan for testing the performance and safety of the
               entire BIS System prior to its release to shipment.

          (d)  The verification and validation of the HP BIS System will be
               performed under HP's overall responsibility at HP's Boeblingen
               premises. Aspect agrees to support this effort as defined in the
               Verification and Validation Plan and as may be required in case
               of problems. Verification and validation of Aspect's BIS Module
               Kit will be performed by Aspect in Aspect's Natick facility.
               After successful validation by HP of the HP BIS System, Aspect
               will also validate the HP BIS System output and confirm in a
               written certificate that the BIS value as displayed on the HP
               Patient Monitor is equivalent to Aspect's BIS implementation.

          (e)  Both parties will inform each other of any planned change in its
               products that may affect compatibility of the HP BIS System
               components or the available regulatory approvals. The Change
               Notification Agreement Form (attached as Exhibit D) will be used
               for this purpose.

                                        5


<PAGE>   6


          (f)  Both parties will provide each other reasonable engineering
               consultation free of charge.

          (g)  Aspect and HP will provide each other free of charge with certain
               number of prototypes and product samples for development,
               verification and validation, and getting regulatory approvals.

     3.6. HP RESPONSIBILITIES.

          (a)  HP shall develop the HP BIS Module according to the mutually
               agreed Functional Technical Specification and External
               Specification at HP's own cost.

          (b)  HP will take responsibility for the development, design and
               performance of the HP BIS Module and for the combination of the
               Aspect components (BIS Module Kit) with the HP components (HP BIS
               Module, HP Patient Monitor) of the HP BIS System.

     3.7. ASPECT RESPONSIBILITIES.

          (a)  Aspect shall develop the HP BIS Engine, the DSC Cable and the
               Module Cable according to the mutually agreed specifications at
               Aspect's own cost.

          (b)  Aspect will take responsibility for the development, design and
               performance of the Aspect BIS Module Kit.

          (c)  Aspect shall make available the BIS Protocol specification to HP
               for implementation into the HP BIS Module or otherwise into HP
               Patient Monitors.

          (d)  Aspect will undertake reasonable efforts to maintain backward
               compatibility for future versions of the BIS Protocol, however no
               guarantee is given.

          (e)  Aspect will inform HP of future changes to the BIS Protocol as
               early as possible and make available such changed BIS Protocol
               specification to HP. The Change Notification Agreement Form
               (attached as Exhibit D) will be used for this purpose.
               Notwithstanding anything to the contrary in the Change
               Notification Agreement Form, HP shall not withhold its approval
               of any future changes to the BIS Protocol as provided in Section
               3.7 (d).

4. PURCHASE AND SALE OBLIGATIONS; LICENSES.

          (a)  General. Subject to the terms and conditions of this Agreement,
               Aspect agrees to sell to HP the Aspect Products listed on Exhibit
               A (Aspect Products and Purchase Prices). For these products,
               Aspect grants to HP or HP's subdistributors a non-exclusive,
               worldwide distribution right for the term of this Agreement. HP
               represents and warrants that the components of the Aspect BIS
               Module Kits purchased from Aspect under this Agreement shall be
               used as components in, incorporated into, or integrated with,
               systems and products which HP sells or leases to third-party
               users in the regular course of business. HP further certifies
               that the components of the Aspect BIS Module Kits will only be
               resold, leased, rented, licensed or otherwise transferred to
               third parties for use as a part of an HP BIS System or as
               replacement parts used in HP BIS Systems.

                                        6


<PAGE>   7



          (b)  BIS Sensors. Apart from section 4.a., Aspect hereby grants HP the
               right to distribute Aspect BIS Sensors solely to HP's customers
               outside North America and solely for use with HP BIS Systems.

          (c)  Sensor Startup Kit. Aspect hereby grants HP the right to sell the
               Sensor Startup Kit for use with the HP BIS System in geographies
               outside North America.

          (d)  Software License. Aspect hereby grants to HP a non-exclusive and
               non-transferable worldwide license, without the right to
               sublicense (except to purchasers of HP BIS Systems and to HP's
               subdistributors), during the term of the Agreement to use the
               Software and related Documentation provided by Aspect solely in
               connection with operation of the components of Aspect BIS Module
               Kit in the HP BIS System. Thereafter, Aspect grants to HP a right
               to use the Software and related Documentation used in conjunction
               with the HP BIS Systems being sold by HP on the date of
               termination with respect to service and support of installed HP
               BIS Systems for a period of 10 years, after termination of the
               Agreement. All rights granted to HP customers to use the HP BIS
               System shall be irrevocable as long as such customers are in
               compliance with the terms of use for such HP BIS Systems and does
               not cure such non-compliant use within 90 days of being notified.
               HP shall not disclose, furnish, transfer, distribute or otherwise
               make available the Software, the Documentation or any portion
               thereof in any form to any third party (other than to purchasers
               of HP BIS Systems and to HP's subdistributors) and shall not
               duplicate the Software, the Documentation or any part thereof
               (other than for HP's internal use). Title to and ownership of and
               all proprietary rights in or related to the Software, the
               Documentation and all partial or complete copies thereof shall at
               all times remain with Aspect or its licensor(s). This Agreement
               shall not be construed as a sale of any rights in the Software,
               the Documentation, any copies thereof or any part thereof. All
               references in this Agreement to sale, resale or purchase of the
               BIS Module Kits or the components thereof, or references or like
               effect, shall, with respect to the Software and the Documentation
               mean licenses or sublicenses of the Software and the
               Documentation pursuant to this Section 4. HP shall not
               disassemble, decompile or otherwise reverse engineer the Software
               or any part thereof, except if Aspect is required under
               applicable law to permit HP to reverse engineer any Software. In
               such event, HP may reverse engineer the Software but only to the
               extent Aspect is required to permit such reverse engineering. HP
               shall retain and shall not alter or obscure any notices, markings
               or other insignia which are affixed to the Software, the
               Documentation or any part thereof at the time it receives such
               Software or such Documentation.

          (e)  BIS Protocol License. Aspect hereby grants to HP a non-exclusive,
               worldwide, irrevocable, royalty-free license to implement
               Aspect's proprietary BIS Protocol and sell it to HP's end
               customers as part of its products for use solely with the Aspect
               BIS Module Kit.

                                        7


<PAGE>   8


               Confidential Materials omitted and filed separately with the
               Securities and Exchange Commission. Asterisks denote omissions.

5. ROYALTIES.

          (a)  For each BIS Module Kit that HP is purchasing from Aspect HP
               shall pay a purchase price for the BIS Module Kit and a royalty
               fee as specified in Exhibit A (Aspect Products and Purchase
               Prices).

          (b)  Within 30 days after the Effective Date, HP shall pay Aspect an
               amount of [**] US$ as prepaid royalties, which will be credited
               against the actual royalty component of the purchase price that
               is due for the sale of the first [**] Aspect BIS Module Kits. It
               is understood that [**] of this amount to [**] in connection with
               the [**].

          (c)  In the event that the Agreement is terminated by HP because
               Aspect is unable to deliver a HP BIS Engine before October
               31st,[**](in accordance with Section 23.2, paragraph b), or in
               the event Aspect fails to deliver the first [**] Aspect BIS
               Module Kits for whatever reason, excluding breach by HP or
               failure to order then Aspect shall refund HP according to the
               following rules:

               (i)  Aspect shall refund to HP that part of the prepayment that
                    is not yet consumed by unit royalties, however not more than
                    [**] US$.

               (ii) Aspect shall [**] of the [**] that is [**] for the [**]. For
                    purposes of [**] it is [**].

          (d)  Aspect agrees to [**] a [**] in accordance with the terms
               outlined in [**] in accordance with Section 5 (c) in the event
               that [**] as determined on a [**] and [**] following the [**] of
               [**]. HP agrees to [**] for [**] in connection with [**]. At such
               time as Aspect completes an initial public offering of its common
               stock, the requirement to [**] will terminate.

6. SCOPE OF DELIVERY

          (a)  Purchase Orders. Purchase orders (via Fax, e-mail, other
               electronic transmission or paper) for Aspect Products to be
               purchased under this Agreement (the "Orders") must be received by
               Aspect during the term of this Agreement and must specify a
               delivery date in accordance with the lead-time schedule outlined
               below under Section 6, paragraph e) All HP Purchase Orders will
               make reference to the appropriate engineering drawing or
               manufacturing reference numbers.

          (b)  Order Acknowledgements. HP purchase orders will be acknowledged
               by Aspect within 5 days after receipt of the order, provided that
               the order is technically correct and that the requested delivery
               time is within the agreed lead time and that the latest forecast
               provided by HP is not exceeded by more than [**] and the quantity
               ordered does not exceed by more than [**] the quantity ordered in
               the preceding month. If the requested delivery time is lower than
               the agreed lead time, or if HP's latest forecast is exceeded by
               more than [**], Aspect shall use reasonable efforts to complete
               the order requirements and to acknowledge the order within 10
               days of its receipt. Order acknowledgements shall not be
               unreasonably withheld.

          (c)  Forecasts. HP shall furnish to Aspect a non-binding monthly
               forecast during the term of this Agreement with the number and
               type of Aspect Products for which HP expects to submit orders for
               the following twelve months. Existing open purchase orders are
               not usually reflected in these forecast numbers.

                                        8


<PAGE>   9


          Confidential Materials omitted and filed separately with the
          Securities and Exchange Commission. Asterisks denote omissions.

          (d)  Cancellation Charges. In the event of the cancellation of any
               Order by HP, HP shall be liable for the payment of cancellation
               charges based on the number of days prior to scheduled delivery
               that written notice of cancellation is received by Aspect, as
               outlined below:
<TABLE>
<CAPTION>
<S>                                                          <C>
    > 10 weeks prior to acknowledged delivery                [**]
    6 - 10 weeks prior to acknowledged delivery              [**] of order value
    4 - 6 weeks prior to acknowledged delivery               [**] of order value
    2 - 4 weeks prior to acknowledged delivery               [**] of order value
    < 2 weeks prior to acknowledged delivery                 [**] of order value
</TABLE>

          (e)  Lead Times. Lead times for the Aspect BIS Module Kit are expected
               to be 12 weeks.

7. PRICES.

          (a)  Purchase Prices. The prices of Aspect Products purchased by HP
               hereunder (the "Purchase Prices") which are ordered during the
               term of the Agreement shall be as set forth in Exhibit A (Aspect
               Products and Purchase Prices).

          (b)  Purchase Price Changes. In consideration of the market situation
               and after consultation with HP, the Purchase Prices set forth in
               Exhibit A (Aspect Products and Purchase Prices) will be reviewed
               12 months after first delivery of production units and annually
               thereafter. Any price increase will become effective only after
               mutual agreement between both Parties, subject to the following:

               (i)  In the event the materials cost for the Aspect BIS Module
                    Kit increases by more than [**]. Aspect shall have the right
                    no more than once per year during the term of this Agreement
                    to increase the Purchase Price of the Aspect BIS Module Kit
                    by an equivalent amount by giving HP written notice of such
                    increase not less than [**] days prior to the date upon
                    which the increased Purchase Price is to become effective.
                    No Purchase Price increase shall apply to Orders for Aspect
                    Products accepted by Aspect prior to or during such [**] -
                    day period which are to be delivered within [**] days of the
                    date of such notice.

          (c)  Aspect may reduce the Purchase Price of any Aspect Product at any
               time. Such reduction shall be applicable to all Aspect Products
               not shipped at the time of the reduction.

          (d)  [**] the Purchases Prices [**] the [**] for [**] and based on
               similar terms and conditions [**] that has entered into a [**]
               the date of this agreement.

          (e)  Taxes. All prices for Aspect Products are exclusive of all
               federal, state and local taxes, levies and assessments, and HP
               shall be responsible for the payment of all such taxes, levies
               and/or assessments imposed on Aspect Products purchased and/or
               licensed by HP hereunder, excluding taxes based on Aspect's net
               income

                                        9


<PAGE>   10



              from the transaction. HP shall be responsible for providing in a
              timely manner all documentation, in the nature of exemption
              certificates or otherwise, necessary to allow Aspect to refrain
              from collections, such as sales tax, which it would otherwise be
              obligated to make

8. TERMS OF PAYMENT.

          (a)  Invoices. HP shall pay to Aspect the Purchase Price of all Aspect
               Products shipped hereunder within 30 days after the receipt of
               Aspect's invoice. Nothing herein shall affect Aspect's right to
               withhold shipment or otherwise exercise its rights under Section
               24 (Termination) hereof in the event of HP's failure to make
               payment when due for Aspect Products delivered to HP. Aspect's
               invoices to HP for Aspect Products purchased under this Agreement
               shall be addressed to:

                  Hewlett-Packard GmbH
                  Department ASC-AP
                  Postfach 1430
                  D-71004 Boeblingen
                  Germany

                  Late Payment Charge. Subject to applicable law, service and/or
                  interest charges not exceeding the lesser of 1-1/2% per month
                  or the highest amount permitted by law may, at the election of
                  Aspect, be assessed on amounts past due more than 30 days.

9. SHIPMENT AND DELIVERY.

          (a)  Delivery Location. Each shipment must indicate the exact address
               of the recipient on the outside of the packaging as follows:

               Hewlett-Packard GmbH
               HSG-E Healthcare Solution Group Europe
               c/o Js. Mueller Spedition GmbH
               Eugen Zeyer Str. 1
               D-75382 Althengstett
               Germany

          (b)  All shipments hereunder shall be freight collect, F.C.A. point of
               origin (Incoterms 1990). All Aspect Products shall be deemed
               delivered and subject to HP's dominion and control when placed in
               the possession of the carrier, packed and ready for shipment to
               HP.. Aspect shall cooperate with HP in the documentation and
               proof of loss claims promptly presented by HP to the appropriate
               carrier and/or insurer.

          (c)  Delivery and Packaging Instructions Delivery and Packaging
               requirements will need to conform to the standards outlined in
               the HP Delivery and Packaging Standard (attached as Exhibit E)

                                       10


<PAGE>   11


          Confidential Materials omitted and filed separately with the
          Securities and Exchange Commission. Asterisks denote omissions.

          (d)  Delivery Date and Date of Dispatch. The requested delivery date
               will be specified on the HP Purchase Order. Aspect will utilize
               reasonable efforts to ensure that the order is delivered in
               accordance with Aspect's order acknowledgement and that the the
               date of dispatch is 10 days prior to the delivery date.

10. ACCEPTANCE.

Any Aspect Product shipped hereunder may be subjected to inspection and
performance testing by HP, in accordance with applicable product specifications
in effect at the time of delivery of such Aspect Products to HP. HP shall
provide written notice to Aspect of the rejection of any such Aspect Product
within [**] days of the date of receipt of any Aspect Product; if more than
[**]% of Aspect Products received in any single shipment do not pass HP's
inspection or performance testing HP may reject the entire shipment lot. Aspect
shall have [**] days from receipt of a notice from HP rejecting an Aspect
Product either, at its option, to make any necessary repairs to the defective
Aspect Product or to replace it. If Aspect replaces an Aspect Product, HP shall
dispose of the replaced Aspect Product in accordance with Aspect's instructions
and at Aspect's expense. HP's sole remedy for rejected Aspect Products shall be
limited to repair or replacement of such Aspect Products.

11. WARRANTY.

          (a)  General. Aspect warrants solely to HP that Aspect Products
               (including Software) delivered hereunder shall perform
               substantially in accordance with the specifications in Exhibit B
               (Aspect's Standard Module Kit) or other applicable product
               specifications as published by Aspect in effect at the time of
               delivery of such Aspect Product (including Software), and shall
               be free from defects in materials and workmanship, when given
               normal, proper and intended usage, for twelve months from the
               date of installation of the HP BIS System at HP's end customer
               site, or eighteen months from the date of shipment by Aspect to
               HP, whichever is less . Aspect agrees, during the applicable
               warranty period, to repair or replace (at Aspect's option) all
               defective Aspect Products within 30 days after date of return to
               Aspect and without cost to HP. This warranty shall not apply to
               expendable components and supply items, such as, but not limited
               to, cables (except for failures occurring within 180 days of
               receipt of shipment), fuses and bulbs (or disposable items such
               as an Aspect BIS Sensor after the expiration date marked on the
               Sensor packaging); nor shall Aspect have any obligation under
               this Agreement to make repairs or replacements which are required
               by normal wear and tear, or which result, in whole or in part,
               from catastrophe, fault or negligence of HP, or anyone claiming
               through or on behalf of HP, or from improper or unauthorized use
               of Aspect Products, or use of Aspect Products in a manner for
               which they were not designed, or by causes external to Aspect
               Products such as, but not limited to, power or air conditioning
               failure.

                                       11


<PAGE>   12


               Confidential Materials omitted and filed separately with the
               Securities and Exchange Commission. Asterisks denote omissions.

          (b)  Warranty Procedures. HP shall notify Aspect of any Aspect
               Products which it believes to be defective during the applicable
               warranty period and which are covered by the warranties set forth
               in paragraph (a). At Aspect's option, such Aspect Products shall
               be returned by HP to Aspect's designated facility for examination
               and testing, or may be repaired on site by Aspect. Aspect shall
               either repair or replace, within 30 days of receipt by Aspect,
               any such Aspect Product found to be so defective and promptly
               return such Aspect Products to HP. Transportation and insurance
               costs, and/or risk of loss or damage during shipments, shall be
               borne by Aspect. Should Aspect's examination and testing not
               disclose any defect covered by the foregoing warranty, Aspect
               shall so advise HP and dispose of or return the Aspect Product in
               accordance with HP's instructions and at HP's sole expense.

          (c)  Repair Warranty. Aspect warrants its repair work and/or
               replacement parts for the duration of the original warranty
               period as set forth in paragraph (a) or at least 6 months
               whichever is longer.

          (d)  LIMITATION. THE PROVISIONS OF THE FOREGOING WARRANTIES ARE IN
               LIEU OF ANY OTHER WARRANTY, WHETHER EXPRESS OR IMPLIED, WRITTEN
               OR ORAL (INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR
               A PARTICULAR PURPOSE). THE FOREGOING WARRANTIES EXTEND TO HP ONLY
               AND SHALL NOT BE APPLICABLE TO ANY OTHER PERSON OR ENTITY
               INCLUDING, WITHOUT LIMITATION, CUSTOMERS OF HP.

12. SERVICE AND SUPPORT.

          (a)  Service and Support. HP shall be responsible for providing
               installation, customer training, service and support (including
               repair) to its end customers for the Aspect Products sold
               hereunder and HP shall bear all related costs incurred for labor,
               parts, or travel to perform such service.

          (b)  Central Repair Service. For the term of this Agreement, Aspect
               agrees to provide central repair service to HP for Aspect
               Products sold hereunder at a charge and as further detailed in
               Exhibit F (Service/Repair).

          (c)  Excessive Failure Rate. If the Annual Failure Rate of Aspect's
               BIS Module Kit excluding out-of-box failures and cables exceeds
               the value as specified in Exhibit B (Aspect's Standard Module
               Kit) by more than [**] then Aspect shall reimburse HP for any
               additional cost (including material and labor, ) incurred by HP
               for repairing the units in excess of the above limit.

          (d)  Service Period. For a period of [**] following the last delivery
               to HP of the applicable Aspect Product ordered by HP hereunder,
               Aspect shall make available repair service (or at Aspect's sole
               discretion, exchange units for the Aspect Products) for purchase
               by HP and third party users of the Aspect products at


                                       12


<PAGE>   13


               Confidential Materials omitted and filed separately with the
               Securities and Exchange Commission. Asterisks denote omissions.
               Aspect's then-current prices for such repair services and
               exchange units. After expiry of this [**] period, Aspect may, in
               its sole discretion, continue to supply repair services (and/or
               exchange units for the Aspect Products) subject to the mutual
               written agreement of the Parties.

          (e)  Service Reporting. Aspect shall maintain a complete record of all
               repair activities performed on any Aspect products received for
               repair, and will provide HP with a monthly report on all service
               actions including failure and repair statistics at a sub-
               assembly levelas laid down in Exhibit F (Service/Repair). Service
               Reports for each product shall be sent electronically by email to
               responsible procurement and technical marketing engineer (Contact
               Persons shown in Exhibit C, Contact Persons / Addresses).
               Rootcause analysis is to be performed and reported by Aspect in
               case of abnormal failures, incidents and malfunctions.


13. QUALITY ASSURANCE.

          (a)  Both parties agree to maintain ISO900x, EN460x, European
               directive 93/42/EEC Annex II ("MDD AX-II") certification status
               and compliance with the U.S. Food and Drug Administration's
               ("FDA") Quality System Regulation ("QSR"), the European Medical
               Device Directive ("MDD"), and other appropriate regulations
               pertinent to the development, manufacturing and marketing of this
               kind of medical product.

          (b)  All Products developed under this Agreement shall fully comply
               with the above quality requirements and guidelines (MDD AX-II,
               FDA QSR, etc.)

          (c)  If the actual Annual Failure Rate ("AFR") of the BIS Module Kit
               or subcomponents thereof exceeds the expected value specified in
               Exhibit B (Aspect's Standard Module Kit) by more than [**] then
               Aspect agrees to investigate the root cause of the problem and
               take the appropriate corrective actions to bring the AFR back
               into the specified range.

14. REGULATORY MATTERS.

          (a)  Aspect shall assume full regulatory responsibility for the Aspect
               Products, including obtaining and maintaining all applicable
               governmental authorizations and regulatory approvals required to
               distribute the BIS Module Kit. Both Parties will work together to
               develop a regulatory plan during phase 1 of the Project which
               defines precisely what these regulatory and localization
               requirements are for all countries where the HP BIS System is
               intended to be sold. In particular, Aspect shall be responsible
               for generating its own Device Master Record for the BIS Module
               Kit and obtaining the CE-mark. It is understood that the BIS
               Module Kit will be a component of the HP BIS System for which HP
               assumes full regulatory responsibility as provided in Section 14
               (c).

                                       13


<PAGE>   14


               Confidential Materials omitted and filed separately with the
               Securities and Exchange Commission. Asterisks denote omissions.

          (b)  HP shall assume full regulatory responsibility for the HP
               Products, including obtaining and maintaining all applicable
               governmental authorizations and regulatory approvals required to
               distribute the HP Patient Monitors and the HP BIS Module in all
               countries in the Territory.

          (c)  HP shall assume the regulatory responsibility for the combination
               of the Aspect and HP components in the HP BIS System. Aspect
               shall fully support HP as required in the process of obtaining
               regulatory approvals by making available to HP any required
               information, data, certificates, or technical files in the
               requested formats.

          (d)  For bringing the Aspect Products into the market in countries
               affected by the European Medical Device Directive ("MDD"), Aspect
               is the legally responsible manufacturer under the MDD as named in
               detail in Exhibit C (Contact Persons/Addresses). The Aspect
               Products shall be marked accordingly.

          (e)  HP and Aspect shall inform each other in writing immediately
               about any event that may require incident reporting in any
               country of the Territory.

          (f)  In the event of any recall of an Aspect Product required by a
               governmental agency for safety or efficacy reasons, or requested
               by Aspect at its sole discretion, which is the result of Aspect's
               failure to supply Aspect Products that (1) conform in all
               material respects to the applicable published specifications
               (including the specifications set forth in Exhibit B (Aspect's
               Standard Module Kit)) or (2) are free from defects in material
               and workmanship (when given normal, proper and intended usage),
               Aspect agrees to repair or replace at its own costs all Aspect
               Products subject to the recall and previously delivered to HP.
               Aspect also agrees to consult with HP to establish a reasonable
               process for managing the recall and Aspect shall be [**]
               (including, but not limited to [**] that are consistent with the
               recall process agreed to by the Parties. In the event the recall
               is not required by a governmental agency for safety or efficacy
               reasons, but is instead requested by Aspect at its sole
               discretion, Aspect will be responsible for determining the scope
               of the recall, including the number of units, timeframe for the
               recall, and criteria for completion. HP agrees to maintain all
               necessary sales records to facilitate the recall.

          (g)  HP may at its sole discretion delegate some of the obligations
               under this Section 14 to its subdistributors.

          (h)  For the purpose of facilitating product traceability, all
               Products purchased from Aspect by HP will require identification
               of an internal order number and tracking code.

15. PRODUCT CHANGES; DISCONTINUED PRODUCTS; FUTURE PRODUCTS; CONTINUED SUPPLY.

          (a)  Product Changes. Aspect shall have the right, at any time and
               from time to time, to make substitutions and modifications to
               Aspect Products, provided that such substitutions or
               modifications will not materially affect form, fit or function of
               Aspect

                                       14


<PAGE>   15


          Confidential Materials omitted and filed separately with the
          Securities and Exchange Commission. Asterisks denote omissions.

          Products. In the event that any proposed substitution or modification
          affects, in Aspect's reasonable judgment, the form, fit or function of
          a Aspect Product, Aspect shall give HP written notice of such proposed
          substitution or modification at least [**] days prior to its taking
          effect and HP shall have the right, during such [**] -day period and
          for [**] days thereafter, to order Aspect Products without such
          substitution or modification for delivery within [**] days after such
          substitution or modification takes effect. Aspect shall give written
          notice of any proposed change to the Aspect Products using the
          Supplier Change Notification Agreement Form (attached as Exhibit D)
          and provide the appropriate verification and validation information
          evaluating the affect on the HP BIS System. Notwithstanding anything
          to the contrary in the Change Notification Agreement Form, HP shall
          not unreasonably withhold its approval of any such changes.

     (b)  Discontinued Products. Aspect agrees to notify HP in writing not less
          than [**] in advance of the discontinuance of any Aspect Product. HP
          shall be able to place orders for at least [**] after receipt of the
          written notice in any case. In addition, HP shall be entitled to
          determine its lifetime-buy quantities and place a corresponding last
          purchase order.

     (c)  Future Products. The Aspect Products are designed for use in measuring
          the effects of anesthetic and sedative agents on the brain during
          surgery. In the event that Aspect develops a product involving a
          different type of index, patient sensor, or application, Aspect and HP
          agree to discuss a new agreement for the purchase of such new product
          or products by HP.

     (d)  Continued Supply. In the event that (a) Aspect makes an assignment for
          the benefit of creditors, or a receiver, trustee in bankruptcy or
          similar officer is appointed to take charge of any or all of Aspect's
          property, or Aspect files a voluntary petition under federal
          bankruptcy laws or similar state statutes or such a petition is filed
          against Aspect and is not dismissed within sixty (60) days, and (b)
          Aspect fails to deliver Aspect Products ordered by HP under this
          Agreement within [**] of the delivery date specified on a purchase
          order complying with Section 4 and accepted by Aspect in accordance
          with Section 4, upon request of HP, Aspect shall grant to HP, a
          nonexclusive license to use the Manufacturing Materials to make and
          have made the Aspect Products for use in the HP BIS System, until [**]
          after Aspect is ready and able to deliver Aspect Products to HP under
          the terms of this Agreement and has notified HP thereof. This includes
          a non-exclusive license to use any tools, design documentation, or any
          other manufacturing materials which may be necessary. The
          manufacturing materials supplied by Aspect shall include a list of the
          Aspect suppliers of parts for Aspect Products. Upon exercise by HP of
          the manufacturing license set forth above, HP shall pay Aspect a
          "Manufacturing License Fee" equal to the royalty specified on Exhibit
          A (Aspect's Products and Purchase Prices).

                                       15


<PAGE>   16


16. OWNERSHIP AND PROTECTION OF RESULTS.

     (a)  It is expressly agreed that neither Aspect nor HP will transfer to any
          Party any patent rights, copyrights or intellectual property of any
          kind that either Party owns at the effective date of this agreement.

     (b)  Aspect shall retain the title to and possession of any models,
          patterns, dies, molds, jigs, fixtures, and other tools made for or
          obtained in connection with this Agreement and solely related to the
          Aspect Products, even if made for, obtained by or paid for by HP.

     (c)  If there are developments (including patentable inventions) conceived,
          created or reduced to practice as part of the joint development
          project then the rights to such developments shall be retained (a) by
          Aspect if conceived, created or reduced to practice solely by Aspect,
          or (b) by HP, if solely conceived, created or reduced to practice by
          HP, or (c) jointly by HP and Aspect (without any duty to account to
          the other) if jointly developed by HP and Aspect provided that:

          HP shall assign to Aspect all rights to any development relating to
          Aspect's BIS Module Kit

          and Aspect shall assign to HP all rights to any development relating
          to the HP Patient Monitor or HP BIS Module subject to Aspect's
          retained rights to the BIS Protocol.

17. DOCUMENTATION AND TRAINING.

         Aspect agrees to provide HP with such product literature, operations
and maintenance manuals, other information and training (including training to
avoid possible misrepresentation of Aspect's Bispectral Index) as is mutually
agreed, to enable HP properly to sell and maintain Aspect Products, provided
that in no event shall the source code or source listings of Aspect Software be
required to be disclosed or provided by Aspect to HP pursuant to this Section 17
or otherwise. Such training needs to begin at least three months prior to
introduction of the HP BIS System and will be defined as part of the Project's
marketing plan.

18. CONFIDENTIALITY.

         No confidential information disclosed by either party to the other in
connection with this Agreement shall be disclosed to any person or entity other
than the recipient party's employees and contractors directly involved with the
recipient party's use of such information who are bound by written agreement to
protect the confidentiality of such information, and such information shall
otherwise be protected by the recipient party from disclosure to others with the
same degree of care accorded to its own confidential information of like
importance. In addition, each party and its representatives shall use the
confidential information only for the purposes specified under this Agreement
and such information shall not be used for any other purpose without the prior
written consent of the disclosing party. To be subject to this provision,
information must be delivered in writing and designated as proprietary or, if
initially delivered orally, must be confirmed

                                       16


<PAGE>   17



in writing as confidential within 30 days after the oral disclosure. Information
will not be subject to this provision if it is or becomes a matter of public
knowledge without the fault of the recipient party, if it was a matter of
written record in the recipient party's files prior to disclosure to it by the
other party, or if it was or is received by the recipient party from a third
person under circumstances permitting its unrestricted disclosure by the
recipient party. Upon termination of this Agreement, each party shall promptly
deliver to the other all confidential information of the other party in the
possession or control of such party and all copies thereof, provided that each
party may retain a copy thereof for archival purposes. The obligations under
this Section 18 shall continue for both parties for a period of 10 years after
delivery by Aspect to HP of the last Aspect Product under this Agreement. HP is
entitled to transmit confidential information of Aspect to Hewlett-Packard
Company and to its subsidiaries and affiliated companies. In this case these
companies may only use such information to the same extent as HP is entitled to
under this Agreement. HP will be responsible that these companies comply with
the confidentiality provisions of this Agreement.

19. INDEMNITIES.

     19.1. INDEMNITIES BY ASPECT.

          (a)  Except as provided below, Aspect shall defend and indemnify HP
               from and against any damages, liabilities, costs and expenses
               (including reasonable attorneys' fees and court costs) arising
               out of any claim that Aspect Products purchased and/or licensed
               hereunder infringe any patent or copyright or misappropriate a
               trade secret of a third party, provided that (i) HP shall have
               promptly provided Aspect written notice thereof and reasonable
               cooperation, information, and assistance in connection therewith,
               and (ii) Aspect shall have sole control and authority with
               respect to the defense, settlement, or compromise thereof. Should
               any Aspect Products delivered hereunder become or, in Aspect's
               opinion, be likely to become the subject of such a claim, Aspect
               may, at its option, either (x) procure for HP the right to
               continue purchasing and using such Aspect Products, or (y)
               replace or modify such Aspect Products so that they become
               non-infringing or if (x) and (y) are not reasonably available to
               Aspect, then (z) terminate HP's rights under this Agreement to
               purchase the allegedly infringing Product and refund to HP the
               amount which HP has paid to Aspect for such Products which are in
               the possession of HP, upon return of such Products in their
               unopened packages to Aspect at its principal facility in the
               United States (freight and insurance at Aspect's expense). In
               such event, Aspect may withhold further shipments of infringing
               or potentially infringing Aspect Products.

               Aspect shall have no liability or obligation to HP hereunder with
               respect to any patent, copyright infringement or trade secret
               misappropriation or claim thereof based upon

               (i)  compliance with designs, plans or specifications of HP,

               (ii) use of Aspect Products by HP in combination with devices or
                    products not purchased and/or licensed hereunder where the
                    Aspect Products would not themselves be infringing,



                                       17


<PAGE>   18



               (iii)use of the Aspect Products by HP in an application or
                    environment for which such Aspect Products were not designed
                    or contemplated, or

               (iv) modifications of the Aspect Products by HP

          (b)  Aspect's liability hereunder shall not exceed the purchase and/or
               license price paid by HP for the Aspect Products found to be
               infringing. The foregoing states the entire liability of Aspect
               with respect to infringement or misappropriation of patents,
               copyrights and trade secrets by the Products or any part thereof
               or by their operation.

          (c)  In the event that any claim is brought against HP as a result of
               personal injuries and/or property damages resulting from that
               portion of the HP BIS System developed and manufactured by
               Aspect, and provided further that such claims do not arise as a
               result of the misuse of the HP BIS System , or the use of the HP
               BIS System in an application for which it was not designed by
               Aspect, where such claim would not have occurred but for such
               misuse or use, Aspect agrees that it shall indemnify and hold HP
               harmless from and against any damages, liabilities, costs and
               expenses arising out of such claim, provided that HP shall
               promptly provide Aspect written notice thereof and reasonable
               cooperation, information and assistance in connection therewith
               and Aspect shall have sole control and authority with respect to
               the defense, settlement or compromise.

         19.2.    INDEMNITIES BY HP.

              (a) Except as provided below, HP shall defend and indemnify Aspect
              from and against any damages, liabilities, costs and expenses
              (including reasonable attorneys' fees and court costs) incurred by
              Aspect as a result of or arising from HP's activities under this
              Agreement, including, without limitation, product liability,
              customer warranty and service claims, provided that

               (i)  Aspect shall have promptly provided HP written notice
                    thereof and reasonable cooperation, information and
                    assistance in connection therewith, and

               (ii) HP shall have sole control and authority with respect to the
                    defense, settlement or compromise thereof, and provided
                    further that

              (iii) HP shall not be liable to Aspect under this Section 19.2 to
                    the extent that such damages, liabilities, costs and
                    expenses arise from Aspect's negligence or a breach of any
                    representation or warranty by Aspect hereunder.

20. TRADEMARKS.

     20.1. ASPECT TRADEMARKS.

          (a)  Ownership. HP acknowledges and agrees that Aspect is the sole and
               exclusive owner of all right, title and interest in and to the
               trademarks (the "Aspect Trademarks") identified on Exhibit H
               (Aspect Trademarks). HP recognizes the value of the Aspect
               Trademarks and the good will associated with the Aspect
               Trademarks. HP agrees that its use of the Aspect Trademarks and
               any good will

                                       18


<PAGE>   19



          arising therefrom shall inure to the benefit of Aspect. Nothing
          contained herein shall create, nor shall be construed as an assignment
          of, any right, title or interest in or to the Aspect Trademarks to HP,
          other than the grant of a license in Section 20.1 (c) below; it being
          acknowledged and agreed that all other right, title and interest in
          and to the Aspect Trademarks is expressly reserved by Aspect. HP shall
          keep the Aspect Trademarks free from all liens, mortgages or other
          encumbrances. HP agrees that it will not attack or otherwise challenge
          the title, validity or any other rights of Aspect in or to the Aspect
          Trademarks.

          (b)  Notice. All HP BIS Systems that use the Aspect Trademarks shall
               be accompanied, where reasonable and appropriate, by a
               proprietary notice consisting of the following elements:

               (i)  The statement "[insert trademark(s)] is a trademark(s) of
                    Aspect Medical Systems, Inc."

               (ii) HP will include the "(TM)" or "(R)" symbol, as instructed by
                    Aspect, after the first prominent use of the Aspect
                    Trademark in the HP Patient Monitor and related materials.
                    HP shall have a period of 30 days in which to begin to use
                    the "(R)" symbol in replacement of the "(TM)" symbol upon
                    receiving instruction to do so by Aspect. HP may continue to
                    deliver stocked literature before the change becomes
                    effective.


              (iii) HP shall reproduce copyright and trademark notices of Aspect
                    on the "splash screen" or in the same location where HP
                    reproduces its own copyright notices .

          (c)  License. Aspect hereby grants to HP a nonexclusive, worldwide,
               royalty-free license (without the right to sublicense) to use the
               Aspect Trademarks to designate and promote Aspect Products in HP
               BIS Systems. HP shall have no other right to use, display or
               utilize the Aspect Trademarks for any other purpose or in any
               other manner.

          (d)  Quality Standards.

               (i)  Upon reasonable notice and request, and at a mutually
                    acceptable date and location, Aspect may inspect the
                    advertising and promotional materials on which the Aspect
                    Trademarks are used so that Aspect may monitor compliance
                    with this Agreement.

               (ii) Compliance. Aspect acknowledges the high standards of
                    quality and excellence established by HP with respect to
                    products bearing HP's trademarks. HP acknowledges the high
                    standards of quality and excellence established by Aspect
                    with respect to products bearing the Aspect Trademarks. HP
                    agrees that HP Patient Monitors with which the Aspect
                    Trademarks are used shall be of such quality so as to
                    maintain such high standards and to reflect well upon
                    Aspect. HP agrees to adhere to HP's own or the following
                    quality standards (whichever may be more rigorous) for use
                    of the Aspect Trademarks by HP:

                    -    In order to ensure that Aspect Products and HP Patient
                         Monitors distributed under the Aspect Trademarks comply
                         with the consistent quality standards of Aspect, all
                         Aspect Products and HP Patient Monitors distributed by
                         or for HP

                                       19


<PAGE>   20


               Confidential Materials omitted and filed separately with the
               Securities and Exchange Commission. Asterisks denote omissions.

                         which bear an Aspect Trademark shall conform to those
                         standards which Aspect provides to HP in writing. HP
                         shall cause each major new release of such HP Patient
                         Monitors to comply with such standards or remove the
                         Aspect Trademark(s) from any such new release, which
                         does not comply with such standards. HP shall have a
                         period of 30 days in which to bring newly shipped HP
                         Patient Monitors into compliance with any standard
                         provided to it by Aspect following the date of this
                         Agreement.

                    -    HP acknowledges that if Aspect Products or HP Patient
                         Monitor products bearing the Aspect Trademarks fail to
                         satisfy the quality standards set forth above, the
                         substantial good will which Aspect have built and now
                         possess in the Aspect Products and in the Aspect
                         Trademarks will be impaired.

          (e)  Protection and Infringement. HP agrees to cooperate with and
               assist Aspect in obtaining, maintaining, protecting, enforcing
               and defending Aspect' proprietary rights in and to the Aspect
               Trademarks. In the event that HP learns of any infringement,
               threatened infringement or passing-off of the Aspect Trademarks,
               or that any third party claims or alleges that the Aspect
               Trademarks infringe the rights of the third party or are
               otherwise liable to cause deception or confusion to the public,
               HP shall notify Aspect giving the particulars thereof, and HP
               shall provide necessary information and assistance to Aspect in
               the event that Aspect decides that proceedings should be
               commenced.

          (f)  Termination. In addition to the termination rights set forth in
               Section 23 hereof, in the event that HP is in material breach of
               any provision of this Section 20, Aspect may, upon [**] written
               notice, terminate the license granted in Section 20.1 (c) if HP
               does not cure such breach or default within such [**] period. The
               parties recognize that curing such breach or default may require
               development of a new version of HP BIS System. If this is the
               case, then HP will be deemed to have cured such breach or default
               if, within the [**] cure period, HP presents to Aspect a plan for
               revision of HP Product that will cure such breach or default,
               such plan is reasonably acceptable to Aspect, and such revision
               is released and distributed within three months following written
               notice of such breach or default.

               In addition to the provisions of Section 23 hereof, upon
               termination of the license granted in Section 20.1 (c), or upon
               termination of this Agreement, for whatever cause:

               (i)  HP shall immediately cease and desist from any further use
                    of the Aspect Trademarks and any trademarks confusingly
                    similar thereto, either directly or indirectly;

               (ii) All rights in the Aspect Trademarks granted to HP hereunder
                    shall immediately revert to Aspect;

              (iii) In the event that this Agreement is terminated for any
                    reason other than a material breach or material default by
                    HP, HP shall have a period of 30 days thereafter to dispose
                    of all of the unsold HP BIS Systems bearing the

                                       20


<PAGE>   21


               Confidential Materials omitted and filed separately with the
               Securities and Exchange Commission. Asterisks denote omissions.

                    Trademarks and advertising and promotional materials
                    relating thereto which had been completed by it prior to
                    such termination, provided such HP BIS Systems and materials
                    were in the process of manufacture more than [**] before
                    such termination.

          (g)  Promotional Claims. The general form of any promotional claims by
               HP regarding Aspect's Bispectral Index technology and/or the
               integration of this technology in HP Patient Monitors, and the
               specific form of the use of Aspect's trade names and trademarks,
               and of intended use claims regarding Aspect's Bispectral Index
               technology, in promotional material, advertisement, and/or in
               written technical literature shall be subject to review and
               approval by Aspect prior to its publication or display.

     20.2. HP TRADEMARKS.

          (a)  The general form of any potential claim by Aspect that HP uses
               Aspect's Bispectral Index technology as part of the HP Patient
               Monitors, and the specific form of the use of HP's trade names
               and trademarks in promotional material, advertisement, and/or in
               written technical literature shall be subject to review and
               approval by HP prior to its publication or display.

          (b)  Upon termination of this Agreement any reference to HP and it's
               trademarks must be immediately removed from any literature or
               other display and must no longer be distributed.

21. EXPORT.

     HP shall not export, directly or indirectly, HP BIS Systems or other
     products, information or materials provided by Aspect hereunder, to any
     country for which the United States requires any export license or other
     governmental approval at the time of export without first obtaining such
     license or approval. It shall be HP's responsibility to comply with the
     latest United States export regulations, and HP shall defend and indemnify
     Aspect from and against any damages, fines, penalties, assessments,
     liabilities, costs and expenses (including reasonable attorneys' fees and
     court costs) arising out of any claim that HP BIS Systems or other
     products, information or materials provided by Aspect hereunder were
     exported or otherwise shipped or transported in violation of applicable
     laws and regulations.

22. CO-MARKETING PROGRAM.

     (a)  HP and Aspect may agree to undertake co-marketing programs in certain
          geographies.

     (b)  HP and Aspect have agreed on a co-marketing program in North America
          as described in Exhibit G (Co-Marketing Program) to this Agreement.


                                       21

<PAGE>   22


          Confidential Materials omitted and filed separately with the
          Securities and Exchange Commission. Asterisks denote omissions.

23. TERM; DEFAULT AND TERMINATION.

    23.1. TERM AND RENEWAL.

          The initial term of this Agreement shall commence on the date first
          specified above (the "Effective Date") and shall continue for a period
          of 6 years. The term of this Agreement shall be automatically renewed
          for successive 12 month periods unless either party provides written
          notice of termination to the other party at least 60 days prior to
          expiration of the Agreement.

    23.2. TERMINATION FOR GOOD CAUSE.

          (a)  The Agreement may be terminated by Aspect giving 30 days written
               notice to HP in the event HP has not commercially introduced an
               HP BIS System by October 31st 2001.

          (b)  The Agreement may be terminated by HP giving 30 days written
               notice to Aspect if Aspect has failed to provide a BIS Module Kit
               with the necessary regulatory approvals to HP by [**].

          (c)  Events of Default. The following shall constitute events of
               default under this Agreement:

               (i)  if either Party assigns this Agreement or any of its rights
                    or obligations hereunder except in connection with the sale
                    of such Party's business to which this Agreement relates
                    (the word "assign" to include, without limiting the
                    generality thereof, a transfer of a majority interest in the
                    Party) without the prior written consent of the respective
                    other Party. Notwithstanding the foregoing, it is understood
                    that this Agreement shall be assigned to Agilent
                    Technologies GmbH, at Herrenberger Strasse 110 - 130,
                    D-71034 Boeblingen, Germany and that Aspect consents to such
                    assignment.; or

               (ii) if either Party shall neglect or fail to perform or observe
                    any of its obligations to the other Party hereunder,
                    including, without limiting the generality thereof, the
                    timely payment of any sums dueor Aspect's inability to
                    deliver Aspect Products, and such failure is not cured
                    within [**] in the event of a default in the payment of
                    amounts owed the other Party) after written notice thereof
                    from the other Party; or

              (iii) if there is (w) a dissolution, termination of existence,
                    liquidation, insolvency or business failure of either Party,
                    or the appointment of a custodian or receiver of any part of
                    either Party's property, if such appointment is not
                    terminated or dismissed within thirty (30) days; (x) a
                    composition or an assignment or trust mortgage for the
                    benefit of creditors by either Party; (y) the commencement
                    by either Party of any bankruptcy proceeding under

                                       22


<PAGE>   23


                           Confidential Materials omitted and filed separately
                         with the Securities and Exchange Commission. Asterisks
                         denote omissions.

                    the United States Bankruptcy Code or any other federal or
                    state bankruptcy, reorganization, receivership, insolvency
                    or other similar law affecting the rights of creditors
                    generally; or (z) the commencement against either Party of
                    any proceeding under the United States Bankruptcy Code or
                    any other federal or state bankruptcy, reorganization,
                    receivership, insolvency or other similar law affecting the
                    rights of creditors generally, which proceeding is not
                    dismissed within thirty (30) days.

          (d)  Remedies. Upon any event of default, and in addition to any other
               remedies either Party may have at law or in equity, the
               non-defaulting Party may cancel any outstanding Order, refuse to
               make or take further Orders or deliveries, cancel any discount
               given, and declare all obligations immediately due and payable.
               The non-defaulting Party shall have all the remedies of a secured
               party under the Uniform Commercial Code and any other applicable
               law. The defaulting Party shall be liable for the other Party's
               expense of retaking, holding, preparing for sale, selling and the
               like, including reasonable attorneys' fees and legal expenses in
               the event of default. Cancellation fees shall not be due and
               payable.

    23.3. INSURANCE.

          Upon request, Aspect shall provide evidence of product liability,
          general liability and property damage insurance against an insurable
          claim or claims which might or could arise regarding Aspect products
          purchased from Aspect. Such insurance will contain a minimum limit of
          liability for bodily injury and property damage of not less than
          2,000,000 (two million) US$.

24. GENERAL PROVISIONS.

     (a)  Force Majeure. In the event that either Party is prevented from
          performing, or is unable to perform, any of its obligations under this
          Agreement due to any act of God, fire, casualty, flood, war, strike,
          lock out, failure of public utilities, injunction or any act,
          exercise, assertion or requirement of governmental authority,
          epidemic, destruction of production facilities, insurrection,
          inability to procure materials, labor, equipment, transportation or
          energy sufficient to meet manufacturing needs, or any other cause
          beyond the reasonable control of the Party invoking this provision,
          and if such Party shall have used its best efforts to avoid such
          occurrence and minimize its duration and has given prompt written
          notice to the other Party, then the affected Party's performance shall
          be excused and the time for performance shall be extended for the
          period of delay or inability to perform due to such occurrence.

     (b)  Publicity. Neither Party shall originate any publicity, news release
          or other public announcement relating to this Agreement or the
          existence of an arrangement between the Parties without the prior
          written approval of the other Party, except as otherwise required by
          law.

                                       23


<PAGE>   24


     (c)  Waiver. The waiver by either Party of a breach or a default of any
          provision of this Agreement by the other Party shall not be construed
          as a waiver of any succeeding breach of the same or any other
          provision, nor shall any delay or omission on the part of either Party
          to exercise or avail itself of any right, power or privilege that it
          has, or may have hereunder, operate as a waiver of any right, power or
          privilege by such Party.

     (d)  No Agency. Nothing contained in this Agreement shall be deemed to
          constitute either Party as the agent or representative of the other
          Party, or both Parties as joint ventures or partners for any purpose.
          Neither Party shall be responsible for the acts or omissions of the
          other Party, and neither Party will have authority to speak for,
          represent or obligate the other Party in any way without prior written
          authority from the other Party.

     (e)  Survival of Obligations. All obligations of either Party which, by
          their nature, require performance after the expiration or termination
          of this Agreement, namely the sections on Royalties (5.(c)), Warranty
          (11), Service and Support (12), Regulatory Matters (14), Ownership and
          Protection of Results (16), Confidentiality (18), Indemnities (19),
          Trademarks (20) shall survive the expiration or termination of this
          Agreement and continue to be enforceable.

     (f)  LIMITATION ON LIABILITY. EXCEPT AS PROVIDED IN SECTION 19.1, ASPECT'S
          LIABILITY ARISING OUT OF THE MANUFACTURE, SALE OR SUPPLYING OF ASPECT
          PRODUCTS OR THEIR USE OR DISPOSITION, WHETHER BASED UPON WARRANTY,
          CONTRACT, TORT OR OTHERWISE, SHALL NOT EXCEED THE AMOUNT OF
          2,000,000.00 (TWO MILLION) US$. IN NO EVENT SHALL ASPECT BE LIABLE TO
          HP OR ANY OTHER PERSON OR ENTITY FOR SPECIAL, INCIDENTAL,
          CONSEQUENTIAL, OR OTHER INDIRECT DAMAGES (INCLUDING, BUT NOT LIMITED
          TO, LOSS OF PROFITS, LOSS OF DATA OR LOSS OF USE DAMAGES) ARISING OUT
          OF THE MANUFACTURE, SALE OR SUPPLYING OF ASPECT PRODUCTS.

     (g)  Severability. In the event that any provision of this Agreement is
          held by a court of competent jurisdiction to be unenforceable because
          it is invalid or in conflict with any law of any relevant
          jurisdiction, the validity of the remaining provisions shall not be
          affected and the rights and obligations of the Parties shall be
          construed and enforced as if the Agreement did not contain the
          particular provisions held to be unenforceable.

     (h)  Governing Law. This Agreement shall be governed by and construed in
          accordance with the laws of the Commonwealth of Massachusetts.

     (i)  Notices. Any notice or communication with regard to the termination of
          or changes to this Agreement from one Party to the other shall be in
          writing and either personally delivered or sent via certified mail,
          postage prepaid and return receipt requested addressed, to such other
          Party at the address of such Party specified in this Agreement or such
          other address as either Party may from time to

                                       24


<PAGE>   25


               Confidential Materials omitted and filed separately with the
               Securities and Exchange Commission. Asterisks denote omissions.

          time designate by notice hereunder.

     (j)  Entire Agreement. This Agreement constitutes the entire agreement
          between the Parties. No waiver, consent, modification or change of
          terms of this Agreement shall bind either Party unless in writing
          signed by both Parties, and then such waiver, consent, modification or
          change shall be effective only in the specific instance and for the
          specific purpose given. There are no understandings, agreements,
          representations or warranties, expressed or implied, not specified
          herein regarding this Agreement or the Aspect Products purchased
          and/or licensed hereunder. Only the terms and conditions contained in
          this Agreement shall govern the transactions contemplated hereunder,
          notwithstanding any additional, different or conflicting terms which
          may be contained in any Order or other document provided by one Party
          to the other. Failure of Aspect to object to provisions contained in
          any Order or other document provided by HP shall not be construed as a
          waiver of the terms and conditions of this Agreement nor an acceptance
          of any such provision. Retention by HP of Aspect Products delivered
          hereunder shall be conclusively deemed to be a confirmation of the
          terms and conditions hereof.

     (k)  Headings. Captions and headings contained in this Agreement have been
          included for ease of reference and convenience and shall not be
          considered in interpreting or construing this Agreement.

     (l)  Exhibits: The following Exhibits shall be part of this Agreement:

                    Exhibit A:         Aspect Products and Purchase Prices

                    Exhibit B:         Aspect's Standard Module Kit

                    Exhibit C:         Contact Persons/Addresses Prices

                    Exhibit D:         Change Notification Agreement

                    Exhibit E:         Delivery and Packaging Standard

                    Exhibit F:         Service/Repair

                    Exhibit G:         Co-Marketing Program

                    Exhibit H:         Aspect Trademarks

                    Exhibit I:         [**]



         IN WITNESS WHEREOF, this Agreement has been duly executed as a sealed
instrument as of the date specified above.

Aspect Medical Systems, Inc.                       Hewlett-Packard GmbH

By: /s/ J. Breckenridge Eagle                By: /s/ Anthony [illegible]
   --------------------------                   ------------------------------
Title:  Chairman                             Title:    General Manager
      -----------------------                      ---------------------------
                                                   Patient Monitoring Division


                                       25


<PAGE>   26


          Confidential Materials omitted and filed separately with the
          Securities and Exchange Commission. Asterisks denote omissions.

                EXHIBIT (A):ASPECT'S PRODUCTS AND PURCHASE PRICES
<TABLE>
<CAPTION>

ORDERABLE                                  ASPECT             HP         UNITS (EA)       Aspect               HP          ROYALTIES
PARTS / PRODUCTS                          PART NO.         ID Number     CASES (PK)     List Price         Base Price        (US$)
                                                                                           (US$)        (US$) - Note A
- ----------------------------------        --------         ---------     ----------     ----------      ---------------    ---------
<S>                                      <S>               <C>           <C>            <C>             <C>                <C>
BIS MODULE KIT (new unit, includes          tbd               tbd           1 ea           [**]               [**]            [**]
DSC, DSC Cable, HP BIS Engine,
Module Cable, User Manual)


Sensor Startup Kit                                                          5 ea                              [**]            [**]

DSC (replacement)                                                                                             [**]            [**]


DSC Cable (replacement)                                                                                       [**]            [**]


HP BIS Engine (replacement)                                                                                   [**]            [**]


Module Cable (replacement)                                                                                    [**]            [**]


User Manual                                                                                                   [**]            [**]
Service Manual                                                                                                [**]            [**]


BIS Application Note (english)                                                                                [**]            [**]


BIS Application Note (french)                                                                                 [**]            [**]


 ...                                                                                                                           [**]
BIS Brochure                                                                                                  [**]            [**]
                                                                                                                              [**]

</TABLE>


Note A:

The HP Purchase Price is the sum of the [**] (based on [**] and the [**] (based
on [**]. In addition to the [**] specified above, HP shall pay to Aspect for
each BIS Module Kit purchased an additional sum to allow Aspect to recover the
incremental costs for Aspect to provide the [**] (including the [**] in lieu of
[**]. It is currently estimated that these incremental costs will be [**] per
module kit.

                                       26


<PAGE>   27


          Confidential Materials omitted and filed separately with the
          Securities and Exchange Commission. Asterisks denote omissions.

EXHIBIT (B):              ASPECT'S STANDARD MODULE KIT

ASPECT'S STANDARD BIS MODULE KIT.

Aspect's BIS 'Module Kit' is designed specifically for [**] and allows the [**]
and to the [**] and the necessary power connections.

The BIS Module Kit consists of a [**] that is placed in [**] that provides the
[**] the high performance analog to [**] of the [**] from the [**] that is [**]
at the [**].

The BIS Engine [**] on the [**] to the [**] via the [**] is constructed [**] to
the [**] are a [**]

       Detailed Technical Specifications:
       ----------------------------------

       Digital Output:              [**]
                                    [**]

       Main Parameters:             [**]
                                    [**]

       Electrical Safety:           [**]

       Power:                       [**]
                                    [**]
                                    [**]

       Artifact Rejection:          [**]

       Bispectral Index:            [**]



       Digital Signal Converter (DSC-2)
       --------------------------------
       Description:                 [**]

                                       27


<PAGE>   28


               Confidential Materials omitted and filed separately with the
               Securities and Exchange Commission. Asterisks denote omissions.

       Weight:                      [**]

       Dimensions:                  [**]
                                    [**]

       Cable Length:                [**]

BIS Engine PCB

       Physical:                    [**]

       Processing Power:            [**]

Software Upgrades

       [**] software is stored in [**]. Software upgrades can be [**] via the
       [**].

Serial Identifier

       [**] is given a [**]. This allows for [**] of every [**].

Annual Failure Rate

       The current [**] rate for the [**] and the [**] of the Project, this
       information will need to be [**]


                                       28


<PAGE>   29


               Confidential Materials omitted and filed separately with the
               Securities and Exchange Commission. Asterisks denote omissions.


                     Exhibit (C): Contact Persons/Addresses

                   Contact Persons and responsibilities at HP:
                   ------------------------------------------

 -------------- ------------- ---------------------- --------------------
  Person         Title         Responsibility         E-mail
                                                      Phone Number/
                                                      Fax Number
 -------------- ------------- ---------------------- --------------------
 [**]            [**]          [**]                   [**]
 -------------- ------------- ---------------------- --------------------



MAILING ADDRESS:    Hewlett-Packard GmbH
                    [**]


PHONE:              [**]


INVOICE ADDRESS:    Hewlett-Packard GmbH



                                       29
<PAGE>   30



               Confidential Materials omitted and filed separately with the
               Securities and Exchange Commission. Asterisks denote omissions.


                     Exhibit (C): Contact Persons/Addresses

                Contact Persons and responsibilities at Aspect:
                -----------------------------------------------

 -------------- ------------- ---------------------- --------------------
  Person         Title         Responsibility         E-mail
                                                      Phone Number/
                                                      Fax Number
 -------------- ------------- ---------------------- --------------------
 [**]            [**]          [**]                   [**]
 -------------- ------------- ---------------------- --------------------



MAILING ADDRESS:    Aspect Medical Systems, Inc.
                    2 Vision Drive
                    Natick, MA 01760-2059
                    USA


                                       30
<PAGE>   31





EXHIBIT (D):  CHANGE NOTIFICATION AGREEMENT FORM








                                       31

<PAGE>   32


- --------------------------------------------------------------------------------
                     Hewlett-Packard Medical Products Group
- --------------------------------------------------------------------------------


MPG SUPPLIER CHANGE NOTIFICATION AGREEMENT FORM

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

NOTICE         UNCONTROLLED IN PRINTED FORM UNLESS STAMPED IN RED

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

DOCUMENT     The document owner is listed below:
OWNERSHIP

             --------------------------------- ---------------------------------
                         FUNCTION                            TITLE
             --------------------------------- ---------------------------------
              MPG Quality Department            Quality System Engineer
             --------------------------------- ---------------------------------


                         ---------- ------------------ -------------------------
REVISION HISTORY
                         ---------- ------------------ -------------------------
                           REV. #     CHANGE ORDER #        CHANGE SUMMARY
                         ---------- ------------------ -------------------------
                             A      2920-1998-01-00009
                         ---------- ------------------ -------------------------
                             B      2920-1998-01-00019  Revise footer to read
                                                        "HP Proprietary".
                                                        Separate "Contact for
                                                        Questions" and Return
                                                        To".
                         ---------- ------------------ -------------------------






                                       32

Rev. B  Document Number: A-Q2920-00142    GRS#MF502                  Page 1 of 2
Title: MPG Supplier Change Notification Agreement Form  For HP Internal Use Only

<PAGE>   33

- --------------------------------------------------------------------------------
                     Hewlett-Packard Medical Products Group
- --------------------------------------------------------------------------------


MPG SUPPLIER CHANGE NOTIFICATION AGREEMENT FORM, continued

- --------------------------------------------------------------------------------
 TO:                                     FROM:
- --------------------------------------  ----------------------------------------
 SUPPLIER NAME:                          DATE:
- --------------------------------------  ----------------------------------------
 SUPPLIER FAX # OR ADDRESS:
                          ----------------------------------------------------

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

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

- --------------------------------------------------------------------------------
DEAR SUPPLIER, CONTRACTOR, OR CONSULTANT:
Hewlett Packards's Medical Products Group (MPG) manufactures in a regulated
environment, and is required to maintain procedures to ensure that all purchased
products and services conform to specified requirements. MPG has determined that
the product or service you supply to MPG impacts, directly or indirectly, the
quality of our finished devices. We ask that you agree to notify MPG of any
changes in the product or service, so that we can determine whether the change
may affect the quality of our finished devices. Although HP's standard purchase
order terms and conditions include this provision, the intent of this document
is to ensure direct supplier recognition and acceptance of this requirement.
TO ENSURE THAT MPG HAS YOUR AGREEMENT ON THIS REQUIREMENT, WE ASK THAT YOU
REVIEW AND SIGN THE AGREEMENT BELOW. IT IS REQUESTED THAT THE SIGNATORY BE THE
QUALITY MANAGER AND THE GENERAL MANAGER (OR DESIGNEE) DIRECTLY INVOLVED WITH THE
MANUFACTURER OF OUR PRODUCT.

- --------------------------------------------------------------------------------
                          CHANGE NOTIFICATION AGREEMENT
                          -----------------------------

Changes to product, components or services supplied to Hewlett Packard Medical
Products Group (MPG) will not be made without prior written notification to, and
written approval from, MPG. This includes, but is not limited to, the following
types of changes:
*  Product or service design changes
* Production process changes that affect design and/or production specifications
* Change of manufacturing or service facility location
* Changes that have a significant impact upon your quality system
* Other
       -----------------------------------------------------------------------
Notification must be made to each MPG purchasing location affected by this
change.
- --------------------------------------------------------------------------------
SUPPLIER COMMENTS:
                  ------------------------------------------------------------

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

- --------------------------------------------------------------------------------
QUALITY MGR:                            GENERAL MGR (OR DESIGNEE):
- --------------------------------------  ----------------------------------------
SIGNATURE:                                                   SIGNATURE:
DATE:                                                        DATE:
                                                             TITLE:
- --------------------------------------  ----------------------------------------
CONTACT FOR QUESTIONS:                                       TELE:
- --------------------------------------  ----------------------------------------
RETURN TO:
- --------------------------------------------------------------------------------
STREET:                                                      CITY/STATE/ZIP:
TELE:                                                        FAX:
- --------------------------------------------------------------------------------


                                       33
<PAGE>   34





EXHIBIT (E):  DELIVERY AND PACKAGING STANDARD





                                       34
<PAGE>   35

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

 HEWLETT-PACKARD GMBH                    DELIVERY-AND PACKAGING STANDARD
 HEWLETT-PACKARD EUROPE BV

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

 ORIGINATOR:  HP/CPDE-ENGINEERING, G-BOBLINGEN

 TABLE OF CONTENTS                                        PAGE
 -----------------                                        ----

1.       GENERAL
1.1.     Applicability                                     2
1.2.     Place of delivery                                 2

2.       DEFINITIONS                                       2

3.       IDENTIFICATION REQUIREMENTS                       3
3.1.     Delivery Note                                     3
3.2.     Load Unit Label                                   4
3.3.     Product Identification Label                      5
3.4.     Customs Declaration                               5
3.5.     Transport Declaration (Dangerous Goods)           5

4.       PACKAGING REQUIREMENTS                            6
4.1.     Delivery Mode                                     6
4.2.     Packages (Boxes)                                  6
4.3.     Load Carriers (Pallets)                           6
4.4.     Dimensions                                        7
4.5.     Load Unit Protection                              7
4.6.     Environmental Requirements                        7
4.7.     Transport Regulations (Dangerous Goods)           7
4.8.     Treatment of Inconsistencies                      8

5.       REVISION CONTROL                                  8




                                       35
<PAGE>   36

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

 HEWLETT-PACKARD GMBH                    DELIVERY-AND PACKAGING STANDARD
 HEWLETT-PACKARD EUROPE BV

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

1.       GENERAL
- ----------------

1.1.     APPLICABILITY
         This specification is applicable to all goods delivered to the premises
         of Hewlett-Packard Businesses in Boblingen and Waldbronn with according
         production plants and distribution centers in Europe.

         Practices other than those stipulated herein must be ratified on a
         case-by-case basis by the purchasing department concerned.
         Hewlett-Packard reserves the right to reject deliveries that do not
         comply with this specification.

1.2.     PLACE OF DELIVERY
         Since HP has several receiving locations in Europe it is essential that
         goods be delivered to the address specified on the purchase order or in
         the purchasing agreement.

2.       DEFINITIONS
- --------------------

         [Graphic depiction of track, load units, product labels, load
         carrier/pallet, package/box and mother/box]






                                       36
<PAGE>   37

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

 HEWLETT-PACKARD GMBH                    DELIVERY-AND PACKAGING STANDARD
 HEWLETT-PACKARD EUROPE BV

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

3.       IDENTIFICATION REQUIREMENTS
- ------------------------------------

3.1.     DELIVERY NOTE:
         no deliveries without a delivery note
         delivery note has to be fixed on the outside of the load or handed out
         by the freight forwarder

- --------------------------------------------------------------------------------
                          DELIVERY NOTE / LIEFERSCHEIN

Supplier:
Fa Meler u Sohne
Kaakonbachatr 34
8000 Monehen
Tel:  (089) 2804-1999

- --------------------------------------------------------------------------------
SUPPLIER CODE  0055885
- --------------------------------------------------------------------------------

- --------------------------------------  ----------------------------------------
DELIVERY NOTE NO.:  349812              DATE:  16.01.1999
- --------------------------------------  ----------------------------------------
SHIP TO:
Hewlett-Packard GmbH
c/o Logistic Group International
Waldbronn Gebaude 5
Herronbarger Str. 124
71034 Boblingen
- --------------------------------------------------------------------------------
RECEIVING ENTITY/NAME:  CPOE / Hohenstein
- --------------------------------------------------------------------------------
DESTINATION CODE                    BB14-4500
- --------------------------------------------------------------------------------
LOAD UNIT:                          12 boxes on 3 pallets
- --------------------------------------------------------------------------------
BOX NO'S:                           6016-XX001 - 6016-XXX12
- --------------------------------------------------------------------------------

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

- --------------------------------------------------------------------------------
POS. HP ORDER NO.  SECTION      ITEM     HP PART NO.    QUALITY    UNIT MEASURED
      (9 digits)  (3 digits) (4 digits)                 (shipped)    (shipped)
- ---- ------------ ---------- ---------- ------------- ----------- --------------
     [Graphic depiction of bar codes]
- ---- ---------------------------------------------------------------------------
 01   N81853921    010.       0100        8120-6809     1000        EA
- ---- ------------ ---------- ---------- ------------- ----------- --------------
 DESCRIPTION:  Powercord:  UK version
- --------------------------------------------------------------------------------
     [Graphic depiction of bar codes]
- ---- ---------------------------------------------------------------------------
 02   N81853821    0100       010         5964-6108     1200        EA
- ---- ------------ ---------- ---------- ------------- ----------- --------------
DESCRIPTION:  Software & Accessories Broschore
- --------------------------------------------------------------------------------
COUNTRY OF ORIGIN  Germany    [Graphic depiction of bar codes]
- --------------------------------------------------------------------------------

                           OPTIONAL DATA PER BUSINESS
        -----------
Legend:  MUST DATA
        -----------



                                       37
<PAGE>   38

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

 HEWLETT-PACKARD GMBH                    DELIVERY-AND PACKAGING STANDARD
 HEWLETT-PACKARD EUROPE BV

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

32.      LOAD UNIT LABELS
         (unique products only)
An adhesive label shall be affixed to each load unit. If a delivery is
consisting of multiple, separate load units, the individual load unit shall be
numbered consecutively (e.g., 1 of 7, 2 of 7, etc.)
- --------------------------------------------------------------------------------
                    LOAD UNIT LABEL/LADEENIHEITENAUSZEICHUNG
                (UNIQUE PRODUCTS ONLY       NUR SORTENREINE WARE)

Supplier:
Fa Meler u Sohne
Kaakonbachatr 34
8000 Monehen
Tel:  (089) 2804-1999
- --------------------------------------------------------------------------------
SUPPLIER CODE  0055865
- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------
DELIVERY NOTE NO.:  349912              DATE:  15.01.1999
- --------------------------------------  ----------------------------------------
SHIP TO:
Hewlett-Packard GmbH
c/o Logistic Group International
Waldbronn Gebaude 5
Herronbarger Str. 124
71034 Boblingen
- --------------------------------------------------------------------------------
RECEIVING ENTITY/NAME:  CPOE / Josef Hohenstein
- --------------------------------------------------------------------------------
DESTINATION CODE                    B614-4500
- --------------------------------------------------------------------------------


- --------------------------------------------------------------------------------
(p) HP PRODUCT                                                TOTAL WEIGHT (kg)
NO.
- -----------------    -----------------    -----------------   ------------------
[Graphic depiction of bar codes]
- --------------------------------------------------------------------------------
C2530-84430                                                   283
- -----------------    -----------------    -----------------   ------------------

- -----------------    -----------------    -----------------   ------------------
(q) QUANTITY:        LOAD UNIT NO:                            SUPPLIER LOT NO.
- --------------------------------------------------------------------------------
[Graphic depiction of bar codes
- --------------------------------------------------------------------------------
Q6000                T12345878                                987654
- -----------------    -----------------    -----------------   ------------------

- -----------------    -----------------    -----------------   ------------------
  HP ORDER NO:            SECTION:              ITEM:         COUNTRY OF ORIGIN:
   (9-digits)            (3-digits)          (4-digits)
- --------------------------------------------------------------------------------
[Graphic depiction of bar codes]
- --------------------------------------------------------------------------------
N820-86975           010                  0100                USA
- -----------------    -----------------    -----------------   ------------------
Box 1 of 3
- --------------------------------------------------------------------------------
                           OPTIONAL DATA PER BUSINESS

        -----------
Legend:  MUST DATA
        -----------



                                       38
<PAGE>   39


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

 HEWLETT-PACKARD GMBH                    DELIVERY-AND PACKAGING STANDARD
 HEWLETT-PACKARD EUROPE BV

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

3.3.     PRODUCT IDENTIFICATION LABELS
         Each smallest package unit (picking unit) of an article must be labeled
         on the outside and shall contain only parts having the same part number
         belonging to the same order.

- --------------------------------------------------------------------------------
 (p) HP PART NO:
- ---------------------------------- ------------------ --------------------------
 [Graphic depiction of bar codes]
- --------------------------------------------------------------------------------
 P9Z80-1250
- ---------------------------------- ------------------ --------------------------
 DESCRIPTION:  Monitor EX300 VGA
- ---------------------------------- ------------------ --------------------------
 (q) QUANTITY:                      UNIT MEASURE:      VOLUME (cdm)
- ---------------------------------- ------------------ --------------------------
 [Graphic depiction of bar codes]
- --------------------------------------------------------------------------------
 Q1                                 EACH               180
- ---------------------------------- ------------------ --------------------------
 COUNTRY OF ORIGIN:                 SUPPLIER LOT NO:   (s) SERIAL NO:  (Range)
- ---------------------------------- ------------------ --------------------------
 [Graphic depiction of bar codes]
- ---------------------------------- ------------------ --------------------------
 GERMANY                            T12345678          2323444
- --------------------------------------------------------------------------------


                           OPTIONAL DATA PER BUSINESS
        -----------
Legend:  MUST DATA
        -----------

3.4.     CUSTOMS DECLARATION
         For deliveries from Non-EU countries and customs relevant deliveries
         from EU countries an Invoice must be attached with all infos for
         customs declaration (Part number, Oder number, Quantity, Box quantity
         and Box weight, Box number, Currency, Item-value and invoice-value,
         Terms of Delivery, CoO, Terms of payment etc.).
         Customs relevant deliveries must be notified on Boxes and Documents.

3.5.     TRANSPORT DECLARATIONS (DANGEROUS GOODS)
         Dangerous Goods must be notified on Boxes and Documents



                                       39
<PAGE>   40


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

 HEWLETT-PACKARD GMBH                    DELIVERY-AND PACKAGING STANDARD
 HEWLETT-PACKARD EUROPE BV

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

4.       PACKAGING REQUIREMENTS
- -------------------------------

4.1.     DELIVERY MODE
         Goods shall be delivered on pallets, if

         --       the volume exceeds 1 m(3)(35 cubic feet)
         --       the weight exceeds 25 kg (66 lbs)
         --       or the consignment consists of more than 5 package units

                  maximum weight per consignment unit:  1000 kg
                  (2200 lbs) incl. load carrier

4.2.     PACKAGES (BOXES)
         Individual packages shall not have a handling weight exceeding 15 kg
         (33 lbs)

4.3.     LOAD CARRIERS (PALLETS)
         All goods shall be delivered on reusable four-way-entry flat pallets
         made of untreated solid wood. Openings for the handling with pallet
         jacks have to be kept open on the small sides (base runners lengthwise
         only).

         Pallets have to be accessible from four sides by regular material
         handling devices. Dimensions must be (unless otherwise specified):
         --       1200 x 100 mm (industry pallets);
         --       1200 x 800 mm Euro pallet
         In exceptional cases 40 x 48 inches.

[Graphic depiction of a load carrier (pallet)]



                                       40
<PAGE>   41

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

 HEWLETT-PACKARD GMBH                    DELIVERY-AND PACKAGING STANDARD
 HEWLETT-PACKARD EUROPE BV

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

4.4      DIMENSIONS
         The goods shall be stacked on the pallet without overhang. A load unit
         shall not exceed an overall height of 1930 mm (76 inches) - including
         pallet. Additional restrictions on height may apply depending on the
         destination, and the purchasing department in question must be
         consulted regarding these restrictions.

4.5.     LOAD UNIT PROTECTION
         Shipment units shall be secured in such a way the good cannot slip or
         the unit loose its integrity. This shall be ensured by the use of
         shrink or stretch wrapping, banding, additional layer sheets,
         interlocked stacking, etc., but shall not hinder the accessibility with
         material handling devices (fork lifts or pallet jack). The products
         shall not be damaged by the LoaD Unit Protection.

4.6.     ENVIRONMENTAL REQUIREMENTS FOR PACKAGING
         GENERAL POINTS
         Packaging should be kept to the minimum amount required to preserve the
         security and hygiene of the packaged products.
         Additionally, any applicable legal norms (see appendix) as well as HP
         specific regulations concerning environment, workplace safety and
         workplace security are to be adhered to. (Refer also to HP's GENERAL
         SPECIFICATION FOR ENVIRONMENT A-5951-1745-1).

         REQUIREMENTS
         --       Low material variety per packaging
         --       Easy separability of the various materials
         --       Avoidance of composite materials
         --       Use of standard and reusable packaging
         --       Material labeling (especially with plastics)
         --       Handling labeling

         --       Recommended packaging materials:
                  Paper, cardboard, corrugated cardboard, untreated wood, iron,
                  aluminum, glass, PE, PP, PS, PET, drying agents: silica gel,
                  active clay

         --       Packaging materials and packaging aids to be avoided:
                  PVC (vinyl), wood chips, compressed fiberboard, wood shavings,
                  straw, loose fill materials, "bio" packaging materials based
                  on plant starch, "popcorn"

         APPENDIX: EXCERPTS OF THE RELEVANT LEGAL NORMS FOR PACKAGING AND
         PACKAGING WASTE
         --       European Waste Guidelines (Europaische Abfallrahmenrichtlinie)
                  75/442/EWG
         --       European Packaging Guidelines (Europaische
                  Verpackungsrichtlnie) 94/62/EG
         --       European Decision 97/129/EG regarding the labeling of
                  packaging material
         --       Industrial Recycling law (Kreislaufwirtschaftsgesetz) and
                  accompanying Waste Law
         --       Transport of Hazardous Waste Law (Gefahrgutbeforderungsgesetz)
                  and accompanying Hazardous Waste Law (Gefahrgutrecht/e.g GGVS)
         --       Packaging Act
         --       Chemical Law (Chemikaliengesetz) and Hazardous Materials Act
                  (Gefahrstoffverordnung) "BGB"
         --       CFC-Halon Prohibition Act (FCKW-Halon-Verbots-Verordnung)

4.7.     TRANSPORT REGULATIONS (DANGEROUS GOODS)



                                       41
<PAGE>   42

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

 HEWLETT-PACKARD GMBH                    DELIVERY-AND PACKAGING STANDARD
 HEWLETT-PACKARD EUROPE BV

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

4.8.     TREATMENT OF INCONSISTENCIES
         In many instances, the packaging is covered by the stipulations of the
         HP product specification. In the event of inconsistencies arising with
         the packaging regulations in the product specification or in existing
         agreements, the supplier shall consult the purchasing department
         concerned.

5.       REVISION CONTROL
- -------------------------

- --------------------------------------------------------------------------------
   Revision     Changes                            Approved           Date
- -------------- ---------------------------------- ------------------ -----------
       D        Completely revised;                Peter Klement      28.04.1999
                English Edition A-5961-3658-1
                German Edition A-5961-3658-2
- -------------- ---------------------------------- ------------------ -----------










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






                                       42
<PAGE>   43
     Confidential Materials omitted and filed separately with the Securities
              and Exchange Commission. Asterisks denote omissions.


                          EXHIBIT (F): SERVICE/REPAIR

1. REPAIR STRATEGY:

FULL UNIT REPAIR:

- -    Defective units will be shipped from HP GSL (Global Support Logistics) to
     Aspect for repair.
- -    Aspect repairs and ships the units within [**] to HP GSL after receipt.
     Each repair unit will be labeled with an internal HP order number and
     tracking number by Aspect. Tracking number and maybe other data must be
     labeled as barcode on the shipment carton by Aspect.

2. Repair Price

Repair consists of [**]

To define for each product:
[**]


Goal for full unit exchange: [**]
Right for Aspect to [**]

To define: [**]

A table detailing the [**] will be defined preliminarily during [**].

3. Handling of Repair Costs:

[**] will pay the then current [**] for any defective unit that is returned to
Aspect. On a regular basis HP will determine the number of units under warranty
that have been replaced/repaired and [**].
Repaired units with "No trouble found" classification Aspect [**] for the
difference between [**] and the following amounts only [**].


                                       43
<PAGE>   44
     Confidential Materials omitted and filed separately with the Securities
              and Exchange Commission. Asterisks denote omissions.


                       EXHIBIT (G): CO-MARKETING PROGRAM

ASPECT/HP JOINT MARKETING PROGRAM - NORTH AMERICA

Both Parties have agreed on the following outline for a joint marketing program,
designed to encourage customers in North America to [**] to implementation of an
integrated BIS measurement module on HP Viridia patient monitors.

PROGRAM DETAILS:

Aspect's and HP's sales force in North America will offer the [**] and will
agree to [**] for the [**] of the [**] of the [**] at a price of [**] the
current list price for the [**], unless the Parties agree that [**] that the
[**] under this program should be [**]. The current list price for the [**], as
outlined below.

<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------
                         Qty 1     Qty 2-5    Qty 6-12    Qty 13-19    Qty >20
- --------------------------------------------------------------------------------
<S>                      <C>        <C>         <C>          <C>        <C>
List Price $             [**]       [**]        [**]         [**]       [**]
- --------------------------------------------------------------------------------
[**]       $             [**]       [**]        [**]         [**]       [**]
- --------------------------------------------------------------------------------
</TABLE>

1.   [**] to [**] to fulfill [**] by this program will be purchased at a [**]
     of [**].

2.   Customers taking advantage of this program will be [**] an [**] of [**] for
     the [**] (to be defined) [**] of the [**] for [**] in North America [**],
     although customer expectations need to be set [**]. There  will be [**] to
     the customer for this [**], although the customer may need to [**] to [**]
     some of his [**] (see below).

3.   Aspect and HP will jointly [**] for this [**] and [**] will provide
     information on the expected cost to the customer of having to [**] in order
     to be [**] with the [**].

4.   [**] the [**] this program and who also purchase [**] under the program,
     these new [**] will be [**] to the appropriate [**] (if necessary) at [**].

5.   Both parties will [**] a [**] this program for customers who have recently
     purchased the [**] was [**].

6.   Aspect will for customers who [**] after the  [**] and invoice the
     customer.


                                       44
<PAGE>   45
     Confidential Materials omitted and filed separately with the Securities
              and Exchange Commission. Asterisks denote omissions.


7.   Aspect will [**] on a [**] for [**] of [**] as a result of this program
     (account details to be defined).

8.   Aspect will provide [**] of [**] this program on a [**].

9.   HP will [**] of [**] of [**] from customers taking advantage of this
     program. The methodology for the calculation and payment of these [**] will
     be defined in the Distribution Agreement between the Parties.

10.  [**] the [**] is [**] will be responsible for [**] at those sites under the
     program. Aspect will be [**] for [**] of the [**].

11.  The timing for implementation of this program will be determined by [**] of
     [**] and [**] of [**], based on their [**] the [**] schedule. The current
     expectation is that this could be done once the project has [**] of the
     [**], at which point [**] has been defined and all risks are understood.

12.  In the event that the [**] is [**], for whatever reason, [**] for [**]
     under this program [**] the customer for any [**] for the [**] the list
     prices defined above.

13.  If development of the [**] is [**] such that [**] North American [**], both
     Parties [**] with a [**] of [**]. [**] of [**] by both Parties in good
     faith, [**] determined by reasons for the [**].

14.  In the event that the customer [**] the [**] for [**] and [**] the customer
     for any [**] made for the [**] the [**] the list prices defined above.


                                       45
<PAGE>   46





                         EXHIBIT (H): ASPECT TRADEMARKS












                                       46
<PAGE>   47


                         EXHIBIT (H): ASPECT TRADEMARKS


TRADEMARK                  REFERENCE
- ---------                  ---------

Aspect(R)                  None *
A-2000(TM)                 A-2000 is a trademark of Aspect Medical Systems, Inc.
Bispectral Index(R)        Bispectral is a registered trademark of Aspect
                           Medical Systems, Inc.
BIS(R)                     BIS is a registered trademark of Aspect Medical
                           Systems, Inc. BIS logo is a registered trademark of
                           Aspect Medical Systems, Inc.

[graphic depiction of Aspect's BIS logo]

*   This trademark is registered as a trademark to another company, and is used
    under license by Aspect Medical Systems.





                                       47
<PAGE>   48
     Confidential Materials omitted and filed separately with the Securities
              and Exchange Commission. Asterisks denote omissions.


                               EXHIBIT (I): [**]


[**]

WHEREAS

We, [**], herewith confirm that we have knowledge that Hewlett-Packard GmbH,
Herrenberger Str. 110-140, 71034 Boblingen, Germany ("HP") has granted Aspect
Medical Systems, Inc., 2 Vision Drive, Natick, MA 01760-2059, USA ("Aspect")
[**] under an "OEM Development and Purchase Agreement" (hereinafter referred to
as the "Agreement"), dated August 6th, 1999 and Aspect has certain contingent
obligations to refund portions of such prepayment in accordance with Section 5
(c) of this Agreement.

THEREFORE

We undertake, [**] under the Agreement. We undertake with [**] in accordance
with the Agreement, we shall [**].

[**] of the Agreement [**]. It is understood that the [**] of the Agreement.


                                       48

<PAGE>   1
                                                                   Exhibit 10.26

                          Aspect Medical Systems, Inc.
   requests that the marked portions of this document be granted confidential
        treatment pursuant to Rule 406 under the Securities Act of 1933.


PRIVILEGED AND CONFIDENTIAL
ATTORNEY-CLIENT AND WORK PRODUCT PRIVILEGES
FOR GE MARQUETTE ONLY


                          ASPECT MEDICAL SYSTEMS, INC.

                     OEM DEVELOPMENT AND PURCHASE AGREEMENT

         Agreement dated this 22nd day of December, 1999, by and between Aspect
Medical Systems, Inc, a Delaware corporation with its principal offices located
at Two Vision Drive, Natick, Massachusetts ("Aspect") and GE Marquette Medical
Systems, Inc. ("Marquette"), a Wisconsin corporation with its principal offices
located at 8200 W. Tower Ave., Milwaukee, Wisconsin for the purchase and/or
license by Marquette of products under the terms and conditions contained in
this Agreement.

1.       BACKGROUND.

         1.1      Aspect is a developer, manufacturer and distributor of medical
                  devices, equipment, related hardware, software and related
                  products and accessories.

         1.2      Marquette is a developer, manufacturer and distributor of
                  medical devices, equipment, related hardware, software and
                  related products and accessories, including multiparameter
                  patient monitors.

         1.3      Marquette desires to integrate Aspect's BIS and EEG technology
                  into Marquette's multiparameter patient monitors.

         1.4      Aspect agrees to sell and/or license to Marquette the products
                  described below, subject to the terms and conditions contained
                  in this Agreement.

2.       DEFINITIONS.

         "ASPECT'S BISPECTRAL INDEX" or "BIS" is Aspect's proprietary processed
         EEG parameter that measures the hypnotic effects of anesthetic and
         sedative agents on the brain during surgery.

         "ASPECT'S EEG PARAMETERS" or "EEG" are Aspect's processed EEG
         parameters including Spectral Edge frequency, Median Frequency,
         Suppression Ratio, EMG and SQI (Signal Quality Index).

         "MARQUETTE PATIENT MONITOR" means any multi-parameter modular patient
         monitoring systems manufactured by or for Marquette. When the BIS/EEG
         Module Development


<PAGE>   2

         Project is complete, the Marquette BIS/EEG module will allow the
         Marquette Patient Monitor to display BIS and certain EEG data
         (waveforms, numerics, status info), and provide setup and operation
         information (user interface), alarming, and network connectivity.

         "MARQUETTE BIS/EEG MODULE" is the sum of all components involved in
         integrating the BIS and EEG with Marquette Patient Monitors.

         "DSC CABLE" is a cable used to connect the DSC-2 or DSC-4 to the
         Marquette BIS/EEG Engine.

         "MARQUETTE BIS/EEG ENGINE" is the processing unit for deriving the BIS
         and EEG data from the raw EEG signal and consists of Aspect's "BIS
         Engine" board modified for Marquette.

         "DIGITAL SIGNAL CONVERTER-2" (or "DSC-2") is used to amplify the analog
         EEG signals as acquired by the BIS sensors and convert it from analog
         to digital signals. The DSC-2 is used by Marquette BIS/EEG Module
         customers to obtain the BIS.

         "DIGITAL SIGNAL CONVERTER-4" (or "DSC-4") is used to amplify the analog
         EEG signals as acquired by the Zipprep electrodes and convert it from
         analog to digital signals. The DSC-4 is used by Marquette BIS/EEG
         Module customers to obtain 2 or 4-channel EEG data only.

         "ASPECT BIS/EEG MODULE KIT" means the bundle of all components of the
         Marquette BIS/EEG Module that are developed and manufactured by or for
         Aspect and licensed/sold to Marquette under this Agreement: DSC-2,
         DSC-4, DSC Cable, Marquette BIS/EEG Engine, and Module Cable.

         "ASPECT BIS SENSOR" means a single use disposable sensor manufactured
         by Aspect for use with the A2000 or with the Aspect BIS/EEG Module Kit
         and that is required to generate Aspect's Bispectral Index.

         "A2000" means Aspect's stand-alone BIS monitor for use with the Aspect
         BIS Sensor and that generates Aspect's Bispectral Index.

         "ASPECT PRODUCTS" means Aspect BIS/EEG Module Kit and any other product
         that can be ordered by Marquette as listed in Exhibit A (Aspect
         Products and Purchase Prices).

         "SOFTWARE" means Aspect software programs in binary code form which are
         designed for use with the Aspect BIS/EEG Module Kit.

         "DOCUMENTATION" means the BIS Engine Serial Interface Specification.

         "TERRITORY" shall mean all countries in which Marquette is permitted
         under this Agreement to distribute Aspect Products.

         "PARTY" or "PARTIES" shall mean Aspect and Marquette each individually
         or jointly.



                                      -2-
<PAGE>   3
  Confidential Materials omitted and filed separately with the Securities and
                Exchange Commission. Asterisks denote omissions.


3.       BIS/EEG MODULE DEVELOPMENT PROJECT.

         3.1      PROJECT TIMING. The overall project duration is expected to be
                  at least [**]. The product introduction is targeted for the
                  annual meeting of the [**], but if such target can not be
                  satisfied the product introduction shall be targeted for no
                  later than the annual meeting of [**]. A preliminary outline
                  of the development project is attached to this Agreement as
                  Exhibit C.

         3.2      PROJECT MANAGEMENT.

                  (a)      Each Party shall appoint a "Project Manager" who
                           shall oversee and manage the joint project on a
                           day-to-day basis.

                  (b)      The Project Managers shall meet regularly based on
                           the project needs to assess the project status and
                           discuss and resolve any issues or problems. These
                           meetings may be held face-to-face or as telephone or
                           video conferences.

                  (c)      Each Party shall bear its own communication and
                           travel costs.

                  (d)      All communication in conjunction with this Agreement
                           shall be directed to the appropriate person and
                           address as listed in Exhibit D (Contact
                           Persons/Addresses).

         3.3      MARQUETTE RESPONSIBILITIES.

                  (a)      Marquette shall develop the Marquette BIS/EEG Module
                           according to mutually agreed specifications at
                           Marquette's own cost.

                  (b)      Marquette shall develop, design and test the modular
                           integration of the components of the Aspect BIS/EEG
                           Module Kit with the Marquette Patient Monitors

         3.4      ASPECT RESPONSIBILITIES.

                  (a)      Aspect shall design, develop, and test the Aspect
                           BIS/EEG Module Kit according to the mutually agreed
                           specifications. The costs for Aspect to complete this
                           project, for which preliminary estimates are included
                           in Exhibit C, shall be borne by Marquette. [**] of
                           total estimated project costs shown on Exhibit C
                           shall be paid by Marquette within [**] days of the
                           date on which this Agreement is signed by both
                           parties; [**] of total estimated project costs, shown
                           on Exhibit C shall be paid [**] days thereafter, and
                           the final payment of the remaining actual project
                           costs (including labor at Aspect's standard labor
                           rates) shall be paid upon the project's completion.
                           Any [**] the [**] will be [**]; provided, however,
                           that Marquette shall not pay over [**] toward
                           non-recurring engineering ("NRE") and tooling to
                           Aspect.



                                      -3-
<PAGE>   4

4.       PURCHASE AND SALE OBLIGATIONS; LICENSES.

         4.1      GENERAL. Subject to the terms and conditions of this
                  Agreement, Aspect agrees to sell to Marquette the Aspect
                  Products listed on Exhibit A (Aspect Products and Purchase
                  Prices). The components of the Aspect BIS/EEG Module Kits
                  purchased from Aspect under this Agreement shall only be used
                  as components in, incorporated into, or integrated with,
                  systems and products which Marquette sells or leases to
                  third-party users in the regular course of business. The
                  components of the Aspect BIS/EEG Module Kits shall only be
                  resold, leased, rented, licensed or otherwise transferred to
                  third parties for use as a part of an Marquette BIS/EEG Module
                  or as replacement parts used in Marquette BIS/EEG Modules and
                  Marquette shall only sell Aspect approved accessories
                  including cables and sensor products in connection with any
                  Marquette BIS/EEG Module. During the term of this Agreement,
                  Marquette agrees that it may offer complementary but not
                  directly competitive products to the Marquette BIS/EEG Module.
                  Marquette products other than the Marquette BIS/EEG Module
                  that display a parameter claiming to be a measure of the
                  hypnotic effect of anesthesia, are considered to be directly
                  competitive products for purposes of this Section 4.1.

         4.2      DISTRIBUTION OF ASPECT BIS SENSORS. Aspect hereby grants to
                  Marquette a non-exclusive right to distribute Aspect BIS
                  Sensors solely to Marquette customers outside of North America
                  who have purchased Marquette BIS/EEG Modules. Prices for
                  Aspect BIS Sensors purchased by Marquette hereunder shall be
                  as set forth in Exhibit A (Aspect Products and Purchase
                  Prices).

         4.3      ASPECT SOFTWARE LICENSE. Aspect hereby grants to Marquette a
                  non-exclusive and non-transferable worldwide license, without
                  the right to sublicense (except to purchasers of Marquette
                  BIS/EEG Modules), during the term of the Agreement to use the
                  Software and related Documentation provided by Aspect solely
                  in connection with operation of the components of Aspect
                  BIS/EEG Module Kit in the Marquette BIS/EEG Module.
                  Thereafter, Aspect grants to Marquette a right to use the
                  Software and related Documentation used in conjunction with
                  the Marquette BIS/EEG Modules being sold by Marquette on the
                  date of termination with respect to service and support of
                  installed Marquette BIS/EEG Modules for a period of 10 years,
                  after termination of the Agreement. All rights granted to
                  Marquette customers to use the Marquette BIS/EEG Modules shall
                  survive any termination of this Agreement as long as such
                  customers remain in compliance with the terms of use for such
                  Marquette BIS/EEG Modules. Marquette shall not disclose,
                  furnish, transfer, distribute or otherwise make available the
                  Software, the Documentation or any portion thereof in any form
                  to any third party (other than to purchasers of Marquette
                  BIS/EEG Modules and to Marquette's subdistributors) and shall
                  not duplicate the Software, the Documentation or any part
                  thereof (other than for Marquette's internal use as provided
                  above). Title to and ownership of any and all proprietary
                  rights in or related to the Software and the Documentation
                  therefor shall at all times remain with Aspect or its
                  licensor(s). Nothing in this Agreement shall be construed as a
                  sale of any rights in the Software or the Documentation. All
                  references in this Agreement to sale, resale or purchase of
                  the



                                      -4-
<PAGE>   5
  Confidential Materials omitted and filed separately with the Securities and
                Exchange Commission. Asterisks denote omissions.


                  Aspect BIS/EEG Module Kits or the components thereof, or
                  references of like effect, shall, with respect to the Software
                  and the Documentation mean licenses or sublicenses of the
                  Software and the Documentation pursuant to this Section 4.
                  Marquette shall not disassemble, decompile or otherwise
                  reverse engineer the Software or any part thereof, except if
                  Aspect is required under applicable law to permit Marquette to
                  reverse engineer any Software. In such event, Marquette may
                  reverse engineer the Software but only to the extent Aspect is
                  required to permit such reverse engineering. Marquette shall
                  retain and shall not alter or obscure any notices, markings or
                  other insignia affixed to the Software, the Documentation or
                  any part thereof at the time it receives such Software or such
                  Documentation.

         4.4      EXCLUSIVITY. Except to the extent Marquette and Aspect may
                  agree in the future to undertake co-marketing programs
                  pursuant to Section 22, nothing in this Agreement shall be
                  construed to grant Aspect any license to sell, distribute or
                  license to any third party the Marquette BIS/EEG Module, the
                  Marquette BIS/EEG Engine, or the Aspect BIS/EEG Module Kit. It
                  is understood, however, that Aspect sells, distributes, and
                  licenses to other third parties both generic and customized
                  Aspect BIS/EEG Engines and Aspect BIS/EEG Module Kits to meet
                  the needs of other OEM customers, and nothing in this
                  Agreement shall prohibit Aspect from continuing to sell,
                  distribute, or license these products or components thereof to
                  customers other than Marquette.

         4.5      STANDARD OF CARE; PRIORITY. In connection with Aspect's
                  performance of its obligations hereunder, Aspect shall use
                  commercially reasonable efforts in the performance of its
                  obligations hereunder and will do so with the same degree of
                  care, skill and prudence customarily exercised when engaged in
                  similar activities for itself.

5.       ROYALTIES AND COMMISSIONS.

         5.1      ROYALTIES ON PURCHASES OF ASPECT MODULE KITS. For each Aspect
                  BIS/EEG Module Kit that Marquette purchases from Aspect,
                  Marquette shall pay a royalty fee and a price for all
                  components of the Aspect BIS/EEG Module Kit. Royalty fees and
                  component prices are specified in Exhibit A (Aspect Products
                  and Purchase Prices); provided that the prices specified in
                  Exhibit A shall not apply to the [**] for the [**] a [**] in
                  [**] for [**] as part [**] agreement pursuant to [**], as [**]
                  will be [**] to [**] at the [**] described in Exhibit A.
                  Aspect BIS/EEG Module Kits sold by Aspect under this
                  Agreement, [**], will be priced based on the Royalty fees and
                  component prices specified in Exhibit A.

         5.2      [**]. For [**] Aspect [**] by Aspect to Marquette [**] in
                  North America for [**] with [**] or with Aspect [**] as part
                  of any [**] pursuant to Section [**],


                                      -5-
<PAGE>   6
  Confidential Materials omitted and filed separately with the Securities and
                Exchange Commission. Asterisks denote omissions.


                  Aspect shall [**] Marquette a [**] to [**] of the [**] by
                  Aspect for [**] Aspect [**]. Aspect shall [**] such [**] to
                  Marquette on a [**]. With such [**], Aspect shall [**] to
                  Marquette a [**] of Marquette [**] to which such [**], the
                  [**] of [**] in that [**], and the [**] from the [**] of the
                  [**] by Aspect. This [**] shall be [**] to Marquette no later
                  than [**] the end of [**]. In the event that Aspect's
                  standalone BIS monitors and/or the BIS modules of other
                  manufacturers have also been installed at such sites in
                  addition to Marquette BIS modules, [**] will be [**] to a [**]
                  only on [**] for [**] with [**]. The Parties will agree upon a
                  reasonable [**] for [**] the number of [**] with [**] in such
                  an event (e.g. a [**] determination based on the [**] of [**]
                  of [**] at [**] during the period) and [**] the [**] to
                  Marquette accordingly. To facilitate [**], Marquette will be
                  responsible for providing Aspect with [**] of the [**],
                  the [**].

6.       SCOPE OF DELIVERY

         6.1      PURCHASE ORDERS. Purchase orders (via Fax, e-mail, other
                  electronic transmission or paper) for Aspect Products to be
                  purchased under this Agreement (the "Orders") must be received
                  by Aspect during the term of this Agreement and must specify a
                  delivery date in accordance with the lead-time schedule
                  outlined below under Section 6(e). All Marquette Purchase
                  Orders shall make reference to the appropriate engineering
                  drawing or manufacturing reference numbers. There is no
                  minimum volume commitment required for each purchase order.

         6.2      ORDER ACKNOWLEDGEMENTS. Marquette purchase orders shall be
                  acknowledged by Aspect within 5 days after receipt of the
                  order, provided that the order is technically correct and that
                  the requested delivery time is within the agreed lead time and
                  that the latest forecast provided by Marquette is not exceeded
                  by more than [**] and the quantity ordered does not exceed by
                  more than [**] of the quantity ordered in the preceding month.
                  If the requested delivery time is less than the agreed lead
                  time, or if Marquette's latest forecast is exceeded by more
                  than [**], or if the quantity ordered exceeds by more than
                  [**] the quantity ordered in the preceding month, Aspect shall
                  use reasonable efforts to complete the requirements of such
                  nonconforming orders within seventy (70) days from the date it
                  receives such nonconforming order and to acknowledge such
                  orders within 10 days of its receipt. Order acknowledgements
                  shall not be unreasonably withheld.

         6.3      FORECASTS. Marquette shall furnish to Aspect a non-binding
                  quarterly forecast during the term of this Agreement with the
                  number and type of Aspect Products for which Marquette expects
                  to submit orders for the following twelve months.



                                      -6-
<PAGE>   7
  Confidential Materials omitted and filed separately with the Securities and
                Exchange Commission. Asterisks denote omissions.


         6.4      CANCELLATION CHARGES. In the event of the cancellation of any
                  Order by Marquette, Marquette shall be liable for the payment
                  of cancellation charges based on the number of days prior to
                  scheduled delivery date that written notice of cancellation is
                  received by Aspect, as outlined below:

<TABLE>
                  <S>                                                            <C>
                  [Greater than] 10 weeks prior to acknowledged delivery        [**]
                  6 - 10 weeks prior to acknowledged delivery                   [**] of order value
                  4 - 6 weeks prior to acknowledged delivery                    [**] of order value
                  2 - 4 weeks prior to acknowledged delivery                    [**] of order value
                  [Less than] 2 weeks prior to acknowledged delivery            [**] of order value
</TABLE>

         6.5      COMMITMENT. Except as set forth in Section 6.4, Marquette has
                  no commitment to purchase any minimum quantity of Aspect
                  Products or Aspect BIS Sensors pursuant to this Agreement.
                  Except as set forth in Section 6.4, unless agreed otherwise in
                  writing by the parties, Marquette shall not be responsible or
                  in any way liable to Aspect or any third party with respect to
                  any component purchase commitments or production arrangements
                  in excess of the amounts or in advance of the times necessary
                  to meet Marquette's delivery schedules set forth in its
                  Orders.

         6.6      LEAD TIMES. Lead times for the Aspect BIS/EEG Module Kit are
                  expected to be [**] days. Late deliveries are subject to late
                  fees of [**] per month (pro-rated daily. In the event of late
                  deliveries by Aspect, Aspect will also promptly reimburse
                  Marquette for expedited shipment charges that Marquette incurs
                  as a direct result of late shipments of the Aspect BIS/EEG
                  Module Kit from Aspect .

7.       PRICES.

         7.1      PURCHASE PRICES. The prices of Aspect Products purchased by
                  Marquette hereunder (the "Purchase Prices") which are ordered
                  during the term of the Agreement shall be as set forth in
                  Exhibit A (Aspect Products and Purchase Prices).

         7.2      PURCHASE PRICE CHANGES. In consideration of the market
                  situation and after consultation with Marquette, the Purchase
                  Prices set forth in Exhibit A (Aspect Products and Purchase
                  Prices) shall be reviewed 12 months after first delivery of
                  production units and annually thereafter. Any price adjustment
                  shall become effective only after mutual agreement between
                  both Parties. [**], Aspect shall have the right [**] during
                  the term of this Agreement to increase the Purchase Price of
                  the Aspect Products without the consent of Marquette by an
                  equivalent amount by delivering reasonable documentation
                  supporting such increase and by giving Marquette written
                  notice of the increase not less than [**] days prior to the
                  date upon which the increased Purchase Price is to become
                  effective. [**] shall apply to orders for Aspect Products
                  accepted by Aspect prior to or during such [**] day period
                  which are to be delivered within [**] days of the date of such
                  notice.



                                      -7-
<PAGE>   8
  Confidential Materials omitted and filed separately with the Securities and
                Exchange Commission. Asterisks denote omissions.


                  Notwithstanding anything to the contrary in this Section 7.2,
                  [**] unless [**] reasonable efforts to [**] of the [**] which
                  have [**] in [**] and, [**] reasonable efforts, was not [**]
                  to [**].

         7.3      PURCHASE PRICE REDUCTIONS. Aspect may reduce the Purchase
                  Price of any Aspect Product at any time. Such reduction shall
                  be applicable to all Aspect Products shipped after the date of
                  the reduction. [**] the [**] of the [**] for the [**] by [**]
                  as provided in Section 7.2, Aspect shall reduce the Purchase
                  Prices for all Aspect Products (excluding license fees and
                  volume discounts) by not less than [**] per year. The first
                  price reduction will be effective on the [**] anniversary of
                  the introduction of the Marquette BIS/EEG Module, and the
                  second price reduction shall be effective on the [**]
                  anniversary of the introduction of the Marquette BIS/EEG
                  Module.

         7.4      [**]. In no case shall the [**] by any other Party that has
                  [**] with Aspect [**] of this Agreement for [**] under [**]
                  terms and conditions.

         7.5      TAXES. All prices for Aspect Products are exclusive of all
                  federal, state and local taxes, levies and assessments, and
                  Marquette shall be responsible for the payment of all such
                  taxes, levies and/or assessments imposed on Aspect Products
                  purchased and/or licensed by Marquette hereunder, excluding
                  taxes based on Aspect's net income from the transaction.
                  Marquette shall be responsible for providing in a timely
                  manner all documentation, in the nature of exemption
                  certificates or otherwise, necessary to allow Aspect to
                  refrain from collections, such as sales tax, which it would
                  otherwise be obligated to make.

8.       TERMS OF PAYMENT.

         8.1      INVOICES. Marquette shall pay to Aspect the Purchase Price for
                  all Aspect Products shipped hereunder within forty-five (45)
                  days after the receipt of Aspect's invoice. Nothing herein
                  shall affect Aspect's right to withhold shipment or otherwise
                  exercise its rights under Section 23 (Termination) hereof in
                  the event of Marquette's failure to make payment when due for
                  Aspect Products delivered to Marquette. Marquette shall have
                  the right to provide Aspect with a specific address to which
                  Aspect will send invoices for Aspect Products purchased under
                  this Agreement.

         8.2      LATE PAYMENT CHARGE. Subject to applicable law, service and/or
                  interest charges not exceeding the lesser of [**] per month or
                  the highest amount permitted by law may, at the election of
                  Aspect, be assessed on amounts past due more than [**] days
                  (that is, more than [**] days after the payment due date as
                  specified in Section 8.1).

9.       SHIPMENT AND DELIVERY.

         9.1      DELIVERY LOCATION. Each shipment must indicate the exact
                  address of the recipient on the outside of the packaging as
                  follows:



                                      -8-
<PAGE>   9
  Confidential Materials omitted and filed separately with the Securities and
                Exchange Commission. Asterisks denote omissions.

                                      [TBD]

         9.2      DELIVERY TERMS. All shipments hereunder shall be FOB Aspect's
                  Massachusetts point of origin (Incoterms 1990). All Aspect
                  Products shall be deemed delivered and subject to Marquette's
                  dominion and control only when placed in the possession of a
                  carrier designated by Marquette, properly packed and ready for
                  shipment to Marquette. Aspect shall cooperate with Marquette
                  in the documentation and proof of loss claims promptly
                  presented by Marquette to the appropriate carrier and/or
                  insurer.

         9.3      DELIVERY DATE AND DATE OF DISPATCH. The requested delivery
                  date shall be specified on the Marquette Purchase Order
                  provided that such delivery date must be at least [**] days
                  after the date Aspect receives the Order; provided, however,
                  that Aspect shall use its reasonable efforts to deliver the
                  Order as early as reasonably possible (taking other customer
                  demands on Aspect into account). Aspect shall utilize
                  reasonable efforts to ensure that the order is delivered in
                  accordance with Aspect's order acknowledgement and that the
                  date of dispatch is ten (10) days prior to the delivery date.
                  Late delivery penalties to Aspect will apply as specified in
                  Section 6.6 of this Agreement.

10.      ACCEPTANCE.

         Any Aspect Product shipped hereunder may be subjected to inspection and
performance testing by Marquette, to confirm that it functions in accordance
with Aspect's applicable product specifications in effect at the time of
delivery of such Aspect Products to Marquette . Marquette shall provide written
notice to Aspect of the rejection of any such Aspect Product within [**] days of
the date of receipt of any Aspect Product. Aspect shall have [**] days from
receipt of a notice from Marquette rejecting an Aspect Product either, at its
option, to make any necessary repairs to the defective Aspect Product or to
replace it. If Aspect replaces an Aspect Product, Marquette shall dispose of the
replaced Aspect Product in accordance with Aspect's instructions and at Aspect's
expense. Marquette's sole remedy for rejected Aspect Products shall be limited
to prompt repair or replacement of such Aspect Products.

11.      WARRANTY.

         11.1     GENERAL. Aspect warrants solely to Marquette that Aspect
                  Products (including Software) delivered hereunder shall
                  perform substantially in accordance with the specifications in
                  Exhibit B (Aspect's Standard Module Kit) or other applicable
                  product specifications as published by Aspect in effect at the
                  time of delivery of such Aspect Product (including Software),
                  and shall be free from defects in materials and workmanship,
                  when given normal, proper and intended usage, for twelve (12)
                  months from the date of shipment of the Marquette BIS/EEG
                  Module at Marquette's end customer site or eighteen (18)
                  months from the date of shipment by Aspect to Marquette,
                  whichever is less. Aspect agrees, during the applicable
                  warranty period, to repair or replace (at Aspect's option) all
                  defective Aspect Products within thirty (30) days after the
                  date of return to Aspect and without cost (including shipping)
                  to Marquette. In the event that Aspect is unable to repair or
                  replace such defective Aspect Products


                                      -9-
<PAGE>   10


                  within such thirty (30) day period, Aspect agrees to refund to
                  Marquette the amounts paid to Aspect for such defective Aspect
                  Products. This warranty shall not apply to expendable
                  components and supply items, such as, but not limited to,
                  cables, fuses and bulbs (or disposable items such as an Aspect
                  BIS Sensor after the expiration date marked on the Sensor
                  packaging); nor shall Aspect have any obligation under this
                  Agreement to make repairs or replacements which are required
                  by normal wear and tear, or which result, in whole or in part,
                  from catastrophe, fault or negligence of Marquette, or anyone
                  claiming through or on behalf of Marquette, or from improper
                  or unauthorized use of Aspect Products, or use of Aspect
                  Products in a manner for which they were not designed, or by
                  causes external to Aspect Products such as, but not limited
                  to, power or air conditioning failure.

         11.2     WARRANTY PROCEDURES. Marquette shall notify Aspect of any
                  Aspect Products which it believes to be defective during the
                  applicable warranty period and which are covered by the
                  warranties set forth in Section 11.1. At Aspect's option, such
                  Aspect Products shall be returned by Marquette to Aspect's
                  designated facility for examination and testing, or may be
                  repaired on site by Aspect. Aspect shall either repair or
                  replace, within thirty (30) days of receipt by Aspect, any
                  such Aspect Product found to be so defective and promptly
                  return such Aspect Products to Marquette. Transportation and
                  insurance costs shall be borne by Aspect. Should Aspect's
                  examination and testing not disclose any defect covered by the
                  foregoing warranty, Aspect shall so advise Marquette and
                  dispose of or return the Aspect Product in accordance with
                  Marquette's instructions and at Marquette's sole expense, and
                  Marquette shall reimburse Aspect for such transportation and
                  insurance costs.

         11.3     REPAIR WARRANTY. Aspect warrants its repair work and/or
                  replacement parts for the duration of the original warranty
                  period as set forth in Section 10(a) or at least six (6)
                  months, whichever is longer.

         11.4     DISCLAIMER OF WARRANTIES. THE PROVISIONS OF THE FOREGOING
                  WARRANTIES ARE IN LIEU OF ANY OTHER WARRANTY, WHETHER EXPRESS
                  OR IMPLIED, WRITTEN OR ORAL (INCLUDING ANY WARRANTY OF
                  MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

12.      SERVICE AND SUPPORT.

         12.1     SERVICE AND SUPPORT. Marquette shall be responsible for
                  providing installation, customer training, service and support
                  (including repair) to its end customers for the Aspect
                  Products Marquette sells to such customers, and Marquette
                  shall bear all related costs incurred for labor, parts, or
                  travel to perform such service.

         12.2     CENTRAL REPAIR SERVICE. For the term of this Agreement, Aspect
                  agrees to provide central repair service (as opposed to field
                  service) to Marquette for Aspect Products sold hereunder.



                                      -10-
<PAGE>   11


         12.3     SERVICE TRAINING. Aspect agrees to provide initial service
                  training to a mutually agreed upon number of Marquette service
                  representatives prior to the market release of the EEG/BIS
                  module, as well as periodic (annually at a minimum) ongoing
                  training for existing and new Marquette service personnel.

         12.4     SERVICE PERIOD. For a period of seven (7) years following the
                  last delivery to Marquette of the applicable Aspect Product
                  ordered by Marquette hereunder, Aspect shall use its
                  reasonable efforts to make available repair service (or at
                  Aspect's sole discretion, exchange units for the Aspect
                  Products) for purchase by Marquette and third party users of
                  the Aspect products at Aspect's then-current prices for such
                  repair services and exchange units. After expiry of this seven
                  (7) year period, Aspect may, in its sole discretion, continue
                  to supply repair services (and/or exchange units for the
                  Aspect Products) subject to the mutual written agreement of
                  the Parties.

         12.5     SERVICE REPORTING. Aspect shall maintain a complete record of
                  all repair activities performed on any Aspect products
                  received for repair, and shall provide Marquette with a
                  quarterly report on all service actions including failure and
                  repair statistics at a sub-assembly level Service Reports for
                  each product shall be sent electronically by email to a
                  designated procurement and technical marketing engineer
                  (Contact Persons shown in Exhibit D, Contact Persons /
                  Addresses). Root cause analysis is to be performed and
                  reported by Aspect to Marquette in case of abnormal failures,
                  incidents and malfunctions.

13.      QUALITY ASSURANCE.

         13.1     CERTIFICATION STATUS. Both parties agree to maintain ISO900x,
                  EN460x, European directive 93/42/EEC Annex II ("MDD AX-II")
                  certification status and compliance with the U.S. Food and
                  Drug Administration's ("FDA") Quality System Regulation
                  ("QSR"), the European Medical Device Directive ("MDD"), and
                  other appropriate regulations pertinent to the development,
                  manufacturing and marketing of medical products similar to the
                  Aspect Products.

         13.2     ASPECT PRODUCT COMPLIANCE. All Aspect Products sold by Aspect
                  under this Agreement shall fully comply with the above quality
                  requirements and guidelines (MDD AX-II, FDA QSR, etc.)

         13.3     QA AND REGULATORY AUDITS. Aspect shall permit Marquette's
                  Quality Assurance department to conduct a reasonable audit of
                  its facilities at a mutually agreed upon date after the date
                  of this Agreement for the purpose of approving its status as
                  an OEM supplier, and reasonable periodic audits thereafter for
                  the purpose of confirming continuing compliance with
                  applicable quality and regulatory requirements and guidelines.
                  Such audits shall be scheduled with at least thirty (30) days
                  advance notice during normal business hours and shall not take
                  place more than once per calendar year.

14.      REGULATORY MATTERS.



                                      -11-
<PAGE>   12

         14.1     ASPECT PRODUCTS. Aspect shall assume full regulatory
                  responsibility for the Aspect Products, including obtaining
                  and maintaining all applicable governmental authorizations and
                  regulatory approvals required to distribute the Aspect BIS/EEG
                  Module Kit. Both Parties shall work together to develop a
                  regulatory plan which defines precisely what these regulatory
                  and localization requirements are for all countries where the
                  Marquette BIS/EEG Module is intended to be sold. In
                  particular, Aspect shall be responsible for generating its own
                  Device Master Record for the Aspect BIS/EEG Module Kit. It is
                  understood that the Aspect BIS/EEG Module Kit shall be a
                  component of the Marquette BIS/EEG Module. Marquette shall be
                  responsible for obtaining and maintaining all applicable
                  governmental authorizations and regulatory approvals required
                  to distribute the combination of Aspect and Marquette products
                  in the Marquette BIS/EEG Module as provided in Section 14.3.

         14.2     MARQUETTE PATIENT MONITORS. Marquette shall assume full
                  regulatory responsibility for the Marquette Patient Monitors,
                  including obtaining and maintaining all applicable
                  governmental authorizations and regulatory approvals required
                  to distribute the Marquette Patient Monitors in all countries
                  in the Territory.

         14.3     MARQUETTE BIS/EEG MODULE. Marquette shall assume the
                  regulatory responsibility for the combination of the Aspect
                  and Marquette components in the Marquette BIS/EEG Module.
                  Aspect shall fully support Marquette as required in the
                  process of obtaining regulatory approvals by making available
                  to Marquette any required information, data, certificates, or
                  technical files in the requested formats.

         14.4     INTERNATIONAL REGULATORY RESPONSIBILITIES. For bringing the
                  Aspect Products into the market in countries affected by the
                  European Medical Device Directive ("MDD"), Aspect is the
                  legally responsible manufacturer under the MDD. The Aspect
                  Products shall be marked accordingly.

         14.5     PRODUCT COMPLAINTS AND INCIDENT REPORTING. Marquette and
                  Aspect shall inform each other in writing immediately about
                  any event that may require incident reporting in any country.
                  Marquette and Aspect shall inform each other in writing within
                  two (2) business days of a customer complaint regarding the
                  Marquette BIS/EEG Module, the Aspect Products, or (within the
                  Territory) Aspect BIS Sensors. Both parties will cooperate and
                  use commercially reasonable efforts to resolve such customer
                  complaints. Closure of any customer complaint relating to the
                  Marquette BIS/EEG Module will occur when Marquette notifies
                  Aspect that the problem is resolved. Closure of any customer
                  complaint relating solely to Aspect Products or Aspect Sensors
                  will occur when Aspect notifies Marquette that the problem is
                  resolved.

         14.6     RECALLS. In the event of any recall of an Aspect Product
                  required by either a governmental agency, by Aspect, or by
                  Marquette for safety or efficacy reasons which is the result
                  of Aspect's failure to supply Aspect Products that (1) conform
                  in all material respects to the applicable published
                  specifications (including the



                                      -12-
<PAGE>   13
  Confidential Materials omitted and filed separately with the Securities and
                Exchange Commission. Asterisks denote omissions.


                  specifications set forth in Exhibit B (Aspect's Standard
                  Module Kit)) or (2) are free from defects in material and
                  workmanship (when given normal, proper and intended usage),
                  Aspect agrees to repair or replace at its own costs all Aspect
                  Products subject to the recall and previously delivered to
                  Marquette. Aspect also agrees to consult with Marquette to
                  establish a reasonable process for managing the recall and
                  Aspect shall be [**] (including, but not limited to [**] that
                  are consistent with the recall process agreed to by the
                  Parties. In the event that Aspect at its sole discretion
                  requests a recall that is not required by a governmental
                  agency for safety or efficacy reasons, Aspect shall be
                  responsible for determining the scope of the recall, including
                  the number of units, timeframe for the recall, and criteria
                  for completion. Marquette agrees to maintain all necessary
                  sales records to facilitate the recall.

         14.7     DELEGATION. Marquette may at its sole discretion delegate some
                  of the obligations under this Section 14 to its
                  sub-distributors.

         14.8     TRACEABILITY. For the purpose of facilitating product
                  traceability, all Products purchased from Aspect by Marquette
                  shall require identification of an internal order number and
                  tracking code.

15.      PRODUCT CHANGES; DISCONTINUED PRODUCTS; FUTURE PRODUCTS; CONTINUED
         SUPPLY.

         15.1     PRODUCT CHANGES. Aspect shall have the right, at any time and
                  from time to time, to make substitutions and modifications to
                  Aspect Products, provided that such substitutions or
                  modifications shall not materially affect form, fit, function,
                  reliability, serviceability, performance, functional
                  interchangeability or interface capability of Aspect Products.
                  In the event that any proposed substitution or modification
                  affects, in Aspect's reasonable judgment, the form, fit,
                  function, reliability, serviceability, performance, functional
                  interchangeability or interface capability of an Aspect
                  Product, Aspect shall give Marquette written notice of such
                  proposed substitution or modification at least [**] days prior
                  to its taking effect and Marquette shall have the right,
                  during such [**] day period and for [**] days thereafter, to
                  order Aspect Products without such substitution or
                  modification for delivery up to [**] days after such
                  substitution or modification takes effect. Aspect shall
                  provide the appropriate verification and validation
                  information for evaluating the effect of the change on the
                  Marquette BIS/EEG Module.

         15.2     DISCONTINUED PRODUCTS. Aspect agrees to notify Marquette in
                  writing not less than [**] in advance of the discontinuance of
                  any Aspect Product. Marquette shall be able to place orders
                  for at least [**] after receipt of the written notice in any
                  case. In addition, Marquette shall be entitled to determine
                  its lifetime-buy quantities and place a corresponding last
                  purchase order.

         15.3     FUTURE PRODUCTS. The Aspect Products are designed for use in
                  measuring the effects of anesthetic and sedative agents on the
                  brain during surgery. In the event that Aspect develops a
                  product involving this or a different type of index, patient



                                      -13-
<PAGE>   14

                  sensor, or application, Aspect and Marquette agree to discuss
                  in good faith a new agreement for the purchase of such new
                  product or products by Marquette.

16.      OWNERSHIP AND PROTECTION OF RESULTS.

         16.1     NO TRANSFER OF OWNERSHIP. It is expressly agreed that neither
                  Aspect nor Marquette shall transfer to the other Party any
                  patent rights, copyrights or other intellectual property of
                  any kind that either Party owns as of the Effective Date of
                  this Agreement.

         16.2     MODELS, PATTERNS, DIES, ETC. Aspect shall retain the title to
                  and possession of any models, patterns, dies, molds, jigs,
                  fixtures, and other tools made for or obtained in connection
                  with this Agreement and related to the Aspect Products, even
                  if made for, obtained by or paid for by Marquette.

         16.3     DEVELOPMENTS. If there are developments (including patentable
                  inventions) conceived, created or reduced to practice under
                  this Agreement then the rights to such developments shall be
                  retained (a) by Aspect if conceived, created and reduced to
                  practice solely by Aspect, or (b) by Marquette, if solely
                  conceived, created and reduced to practice by Marquette, or
                  (c) jointly by Marquette and Aspect (without any duty to
                  account to the other) if jointly developed by Marquette and
                  Aspect, provided that:

                           (i)      Marquette shall assign to Aspect all rights
                                    to any developments conceived, created or
                                    reduced to practice by Marquette solely
                                    relating to the Aspect BIS/EEG Module Kit;
                                    and

                           (ii)     Aspect shall assign to Marquette all rights
                                    to any development solely relating to the
                                    Marquette Patient Monitor.

17.      DOCUMENTATION AND TRAINING.

Aspect agrees to provide Marquette with such product literature, operations and
maintenance manuals, and other information and training (including training to
avoid possible misrepresentation of Aspect's Bispectral Index) as is mutually
agreed, to enable Marquette to properly sell and maintain Aspect Products,
provided that in no event shall the source code or source listings of Aspect
Software be required to be disclosed or provided by Aspect to Marquette except
as provided in Section 25 (Source Code Escrow). Aspect agrees to give Marquette
the rights to use or reproduce its user documentation for incorporation into
Marquette documentation excluding source code or source listings as previously
mentioned. Such documentation should be provided in an electronic format. Aspect
shall be given the opportunity to review and approve Marquette documentation
that incorporates Aspect documentation prior to publication. The training Aspect
is required to provide Marquette under this Section 17 shall begin at least
three (3) months prior to introduction of the Marquette BIS/EEG Module and shall
be defined as part of the Project's marketing plan.





                                      -14-
<PAGE>   15

18.      CONFIDENTIALITY.

No confidential information disclosed by either Party to the other in connection
with this Agreement shall be disclosed to any person or entity other than the
recipient Party's employees and contractors directly involved with the recipient
Party's use of such information who are bound by written agreement to protect
the confidentiality of such information, and such information shall otherwise be
protected by the recipient Party from disclosure to others with the same degree
of care accorded to its own confidential information of like importance. In
addition, each Party and its representatives shall use the confidential
information only for the purposes specified under this Agreement and such
information shall not be used for any other purpose without the prior written
consent of the disclosing Party. To be subject to this provision, information
must be delivered in writing and designated as proprietary or confidential, or
if initially delivered orally, must be identified at the time of disclosure, and
confirmed in writing as confidential within ten (10) days after such oral
disclosure. Information shall not be subject to this provision if it is or
becomes a matter of public knowledge without the fault of the recipient Party,
if it was a matter of written record in the recipient Party's files prior to
disclosure to it by the other Party, if it was or is received by the recipient
Party from a third person under circumstances permitting its unrestricted
disclosure by the recipient Party, or if it was independently developed by the
recipient Party without reference to the confidential information. Upon
termination of this Agreement, each Party shall promptly destroy all
confidential information of the other Party in the possession or control of such
Party and all copies thereof, provided that each Party may retain one copy
thereof for archival purposes. The obligations under this Section 18 shall
continue for both parties for a period of five (5) years after delivery by
Aspect to Marquette of the last Aspect Product under this Agreement, provided,
however that any source code disclosed pursuant to the Source Code Escrow
established under to Section 25 shall be maintained in confidence in perpetuity.
Marquette is entitled to transmit confidential information of Aspect to
Marquette subsidiaries and affiliated companies. In such, case these
subsidiaries and affiliated companies may only use such information to the same
extent as Marquette is entitled to use such information under this Agreement.
Marquette shall be responsible if any of these subsidiaries and affiliated
companies fail to comply with the confidentiality provisions of this Agreement.




                                      -15-
<PAGE>   16

19.      WARRANTIES AND INDEMNITIES.

         19.1     WARRANTIES BY ASPECT.

                  (a)      Aspect represents and warrants that it either has all
                           rights, title and interest in, or valid licenses to,
                           the Aspect Products and any related intellectual
                           property rights thereto. Aspect represents and
                           warrants that it has not granted in the Territory any
                           exclusive licenses or exclusive sublicenses in the
                           Aspect Products that would prevent it from granting
                           Marquette the licenses set forth in Section 4.3
                           (Aspect Software License). Aspect also represents and
                           warrants that it has the right and authority to
                           engage in the joint development of the Marquette
                           BIS/EEG module as contemplated hereunder and that to
                           its knowledge such activity will not infringe upon or
                           misappropriate any third party's intellectual
                           property rights.

                  (b)      Aspect warrants that it will deliver all Aspect
                           Products free from the rightful claims of any third
                           party for infringement of any Patents, Trademarks or
                           Copyrights or misappropriation of Trade Secrets.
                           Aspect also warrants that as of the date of this
                           Agreement, Aspect has received no notice of a claim
                           of infringement or misappropriation from any third
                           party regarding Aspect Products. Marquette's
                           exclusive remedy with respect to breach of any
                           warranty provided in this Section 19.1 shall be that
                           Aspect will defend at its own expense, and will pay
                           the costs and damages (including attorneys fees,
                           other professional fees and other costs of litigation
                           or settlement) made in settlement or awarded as a
                           result of, any action brought against Marquette or
                           any of Marquette's customers based on an allegation
                           of such infringement or misappropriation with respect
                           to any Aspect Product, provided that the
                           Indemnification Procedures set forth in Section 19.3
                           are followed. If an injunction is obtained against
                           Marquette's or its customers' use of an Aspect
                           Product by reason of an infringement or
                           misappropriation described above, or if in Aspect's
                           opinion an Aspect Product or any part thereof is
                           likely to become the subject of a claim of such
                           infringement or misappropriation, Aspect will, at its
                           option and its own expense procure the right for
                           Marquette and its customers to continue using such
                           Aspect Product, or replace or modify such Aspect
                           Product or any part thereof so that it becomes
                           non-infringing. If neither of the foregoing options
                           are reasonably available to Aspect, Aspect shall have
                           the right to discontinue supplying such Aspect
                           Products to Marquette. Aspect shall not have any
                           obligation to Marquette or its customers under any
                           provision of this Section if the infringement or
                           misappropriation claim is based upon the modification
                           of any Aspect Product not made by Aspect, the use of
                           Aspect Products in combination with any program or
                           equipment, or any part thereof, not furnished or
                           recommended in writing by Aspect, or the use of such
                           Aspect Products in a manner or environment, or for
                           any purpose, for which Aspect did not design or
                           license them.



                                      -16-

<PAGE>   17
                  (c)      In the event that any claim is brought against
                           Marquette as a result of personal injuries and/or
                           property damages resulting from that portion of the
                           Marquette BIS/EEG Module developed and manufactured
                           by Aspect, and provided further that such claims do
                           not arise as a result of the misuse of the Aspect
                           Products, or the use of the Aspect Products in an
                           application for which it was not designed by Aspect,
                           where such claim would not have occurred but for such
                           misuse or use, Aspect agrees that it shall indemnify
                           and hold Marquette and its directors, officers,
                           employees, representatives and agents harmless from
                           and against any damages, liabilities, costs and
                           expenses (including attorneys' and other professional
                           fees and other costs of litigation) arising out of
                           such claim, provided that the procedures set forth in
                           Section 19.3 are followed.

         19.2     WARRANTIES BY MARQUETTE.

                  (a)      Marquette represents and warrants that it either has
                           all rights, title and interest in, or valid license
                           to, the Marquette Patient Monitor and any related
                           intellectual property rights thereto. Marquette also
                           represents and warrants that it has the right and
                           authority to engage in the development of the
                           Marquette BIS/EEG Module as contemplated hereunder
                           and that to its knowledge such activity will not
                           infringe upon or misappropriate any third party's
                           intellectual property rights or violate the terms of
                           any agreement Marquette has entered into with a third
                           party.

                  (b)      Marquette warrants that as of the date of this
                           Agreement, Marquette has received no notice of a
                           claim of infringement or misappropriation from any
                           third party regarding the Marquette Patient Monitor
                           or any other Marquette-supplied component of the
                           Marquette BIS/EEG Module. Aspect's exclusive remedy
                           with respect to breach of any warranty provided in
                           this Section 19.2 shall be that Marquette will defend
                           at its own expense, and will pay the costs and
                           damages (including attorneys fees, other professional
                           fees and other costs of litigation or settlement)
                           made in settlement or awarded as a result of, any
                           action brought against Aspect or any of Aspect's
                           customers based on an allegation of such infringement
                           or misappropriation with respect to any Marquette
                           Patient Monitor or any other Marquette-supplied
                           component of the Marquette BIS/EEG Module, provided
                           that the Indemnification Procedures set forth in
                           Section 19.3 are followed. If an injunction is
                           obtained against Aspect's or its customers' use of a
                           Marquette Patient Monitor or any other
                           Marquette-supplied component of the Marquette BIS/EEG
                           Module by reason of an infringement or
                           misappropriation described above, or if in
                           Marquette's opinion a Marquette Patient Monitor or
                           any other Marquette-supplied component of the
                           Marquette BIS/EEG Module or any part thereof is
                           likely to become the subject of a claim of such
                           infringement or misappropriation, Marquette will, at
                           its option and its own expense procure the right for
                           Aspect and its customers to continue using such
                           Marquette Patient Monitor or any other
                           Marquette-supplied component of the Marquette



                                      -17-
<PAGE>   18
                           BIS/EEG Module, or replace or modify such Marquette
                           Patient Monitor or any other Marquette-supplied
                           component of the Marquette BIS/EEG Module or any part
                           thereof so that it becomes non-infringing. Marquette
                           shall not have any obligation to Aspect or its
                           customers under any provision of this Section 19.2 if
                           the infringement or misappropriation claim is based
                           upon the use of Marquette Patient Monitors or any
                           other Marquette-supplied component of the Marquette
                           BIS/EEG Modules in combination with any program or
                           equipment, or any part thereof, not furnished or
                           recommended in writing by Marquette, or the use of
                           such Marquette Patient Monitors or any other
                           Marquette-supplied component of the Marquette BIS/EEG
                           Modules in a manner or environment, or for any
                           purpose, for which Marquette did not design or
                           license them.

                  (c)      In the event that any claim is brought against Aspect
                           as a result of personal injuries and/or property
                           damages resulting from the Marquette BIS/EEG Module,
                           and provided further that such claims do not arise as
                           a result of the defective design or operation of that
                           portion of the Marquette BIS/EEG Module developed or
                           manufactured by Aspect, Marquette agrees that it
                           shall indemnify and hold Aspect and its directors,
                           officers, employees, representatives and agents
                           harmless from and against any damages, liabilities,
                           costs and expenses (including attorneys' and other
                           professional fees and other costs of litigation)
                           arising out of such claim, provided that the
                           procedures set forth in Section 19.3 are followed.

         19.3     INDEMNIFICATION PROCEDURES.

                  (a)      In the event that any person intends to claim
                           indemnification pursuant to this Agreement, (an
                           "Indemnitee"), it shall promptly notify the
                           indemnifying Party (the "Indemnitor") in writing of
                           such alleged liability, provided that the failure to
                           promptly notify the Indemnitor shall not relieve the
                           Indemnitor of any obligation under this Agreement
                           except to the extent such failure to provide prompt
                           notice adversely impairs the Indemnitor's ability to
                           defend against the claim, suit or proceeding.

                  (b)      The Indemnitor shall have the sole right to control
                           the defense and settlement thereof, provided, that
                           (i) the Indemnitor may not consent to imposition of
                           any obligation or restriction on the Indemnitee in
                           any settlement unless mutually agreed among Aspect
                           and Marquette (ii) Indemnitor shall keep Indemnitee
                           fully informed and permit the Indemnitee to
                           participate (at Indemnitee's expense) as the
                           Indemnitee may reasonably request and (iii)
                           Indemnitee may, without affecting its right to
                           indemnity hereunder, defend and settle any such
                           claim, suit or proceeding if Indemnitor declines to
                           defend against such claim, suit or proceeding or
                           Files for Bankruptcy. The Indemnitee shall cooperate
                           with the Indemnitor and its legal representatives in
                           the investigation of any action, claim or liability
                           covered by this Agreement.




                                      -18-
<PAGE>   19

                  (c)      The Indemnitee shall not, except at its own cost,
                           voluntarily make any payment or incur any expense
                           with respect to any claim or suit without the prior
                           written consent of Indemnitor, which Indemnitor shall
                           not be required to give, provided that the Indemnitee
                           may, without affecting its right to indemnity
                           hereunder, defend and settle any such claim, suit or
                           proceeding if the Indemnitor declines to take
                           responsibility or Files for Bankruptcy.

20.      TRADEMARKS.

         20.1     TRADEMARKS.

                  (a)      OWNERSHIP. Marquette acknowledges and agrees that
                           Aspect is the sole and exclusive owner of all right,
                           title and interest in, or has valid licenses to the
                           trademarks (the "Aspect Trademarks") identified on
                           Exhibit E (Aspect Trademarks). Aspect acknowledges
                           and agrees that Marquette is the sole and exclusive
                           owner of all right, title and interest in and to the
                           trademarks (the "Marquette Trademarks") identified on
                           Exhibit F (Marquette Trademarks). Each Party
                           recognizes the value of the other Party's Trademarks
                           and the good will associated with the other Party's
                           Trademarks. Marquette agrees that its use of the
                           Aspect Trademarks and any good will arising therefrom
                           shall inure to the benefit of Aspect. Aspect agrees
                           that its use of the Marquette Trademarks and any good
                           will arising therefrom shall inure to the benefit of
                           Marquette. Nothing contained herein shall create, nor
                           shall be construed as an assignment of, any right,
                           title or interest in or to the Aspect Trademarks to
                           Marquette, or the Marquette Trademarks to Aspect,
                           other than the grant of the licenses in Section 20.1
                           (c) below; it being acknowledged and agreed that all
                           other right, title and interest in and to the Aspect
                           Trademarks is expressly reserved by Aspect and its
                           licensors, and all other right, title and interest in
                           and to the Marquette Trademarks is expressly reserved
                           by Marquette. Each Party shall keep the other Party's
                           Trademarks free from all liens, mortgages or other
                           encumbrances. Each Party agrees that it shall not
                           attack or otherwise challenge the title, validity or
                           any other rights of the other Party in or to its
                           Trademarks.

                  (b)      NOTICE. All Marquette BIS/EEG Modules that use the
                           Aspect Trademarks shall be accompanied, where
                           reasonable and appropriate, by a proprietary notice
                           consisting of the following elements:

                           (i)      The statement "[insert trademark(s)] is a
                                    trademark(s) of [or licensed to] Aspect
                                    Medical Systems, Inc."

                           (ii)     Marquette shall include the "(TM)" or "(R)"
                                    symbol, as instructed by Aspect, after the
                                    first prominent use of the Aspect Trademark
                                    in the Marquette Patient Monitor and related
                                    materials. Marquette shall have a period of
                                    sixty (60) days in which to begin to use the




                                      -19-
<PAGE>   20
  Confidential Materials omitted and filed separately with the Securities and
                Exchange Commission. Asterisks denote omissions.


                                    "(R)" symbol in replacement of the "(TM)"
                                    symbol upon receiving instructions to do so
                                    by Aspect for all new stock of such
                                    materials. Marquette may continue to deliver
                                    stocked literature before the change becomes
                                    effective.

                  Marquette shall reproduce copyright and trademark notices of
                  Aspect on the "splash screen" or in the same location where
                  Marquette reproduces its own copyright and trademark notices .

                  (c)      LICENSE. Each Party hereby grants to the other a
                           nonexclusive, worldwide, royalty-free license
                           (without the right to sublicense) to use the other
                           Party's Trademarks to designate and promote Aspect
                           Products in conjunction with Marquette BIS/EEG
                           Modules. Neither Party shall have any other right to
                           use, display or utilize the other Party's Trademarks
                           for any other purpose or in any other manner.

                  (d)      QUALITY STANDARDS.

                           (i)      INSPECTION. Upon reasonable notice and
                                    request, each Party will furnish to the
                                    other samples of its applicable advertising
                                    and promotional materials as necessary to
                                    allow the requesting Party to monitor
                                    compliance with this Agreement.

                           (ii)     COMPLIANCE. Aspect acknowledges the high
                                    standards of quality and excellence
                                    established by Marquette with respect to
                                    products bearing Marquette's trademarks.
                                    Marquette acknowledges the high standards of
                                    quality and excellence established by Aspect
                                    with respect to products bearing the Aspect
                                    Trademarks. Each Party agrees that Marquette
                                    BIS/EEG Modules with which both parties'
                                    Trademarks are used shall be of such quality
                                    so as to maintain such high standards and to
                                    reflect well upon both Parties. Each Party
                                    agrees to adhere to its own or the following
                                    quality standards (whichever may be more
                                    rigorous) for use of the other Party's
                                    Trademarks in connection with the Marquette
                                    BIS/EEG Module:

                                    -        In order to ensure that the
                                             Marquette BIS/EEG Module
                                             distributed under both parties'
                                             Trademarks complies with the
                                             consistent quality standards of
                                             each Party, all Marquette BIS/EEG
                                             Modules distributed by or for
                                             Marquette which bear an Aspect
                                             Trademark shall conform to those
                                             commercially reasonable standards
                                             which Aspect provides to Marquette
                                             in writing. Marquette shall cause
                                             each major new release of such
                                             Marquette BIS/EEG Modules to comply
                                             with such standards or remove the
                                             Aspect Trademark(s) from any such
                                             new release, which does not comply
                                             with such standards. Marquette
                                             shall have a period of [**] in
                                             which to bring newly manufactured
                                             Marquette



                                      -20-
<PAGE>   21
  Confidential Materials omitted and filed separately with the Securities and
                Exchange Commission. Asterisks denote omissions.


                                             BIS/EEG  Modules into compliance
                                             with any commercially reasonable
                                             standard provided to it in writing
                                             by Aspect following the date of
                                             receipt of such standard.

                                    -        Each Party acknowledges that if
                                             Marquette BIS/EEG Modules bearing
                                             both Parties' Trademarks fail to
                                             satisfy the quality standards set
                                             forth above, the substantial good
                                             will which each Party has built and
                                             now possess in its own products and
                                             Trademarks shall be impaired.

                  (e)      PROTECTION AND INFRINGEMENT. Each Party agrees to
                           cooperate with and assist the other Party in
                           obtaining, maintaining, protecting, enforcing and
                           defending the other Party's proprietary rights in and
                           to its Trademarks. In the event that either Party
                           learns of any infringement, threatened infringement
                           or passing-off of the other Party's Trademarks, or
                           that any third party claims or alleges that the other
                           Party's Trademarks infringe the rights of the third
                           party or are otherwise liable to cause deception or
                           confusion to the public, the Party obtaining such
                           information shall notify the other Party giving the
                           particulars thereof, and if such claims or
                           allegations relate to this Agreement, the Marquette
                           BIS/EEG Module, the Aspect BIS/EEG Kit or Aspect
                           Products sold hereunder, shall provide necessary
                           information and assistance reasonably requested by
                           such other Party in the event that such other Party
                           decides that proceedings should be commenced.

                  (f)      TERMINATION. In addition to the termination rights
                           set forth in Section 23 hereof, in the event that
                           either Party is in material breach of any provision
                           of this Section 20, the non-breaching Party may, upon
                           [**] days written notice, terminate the license
                           granted in Section 20.1 (c) if the breaching Party
                           does not cure such breach or default within such [**]
                           day period. In addition to the provisions of Section
                           23 hereof, upon termination of the license granted in
                           Section 20.1 (c), or upon termination of this
                           Agreement, for whatever cause:

                           (i)      each Party shall immediately cease and
                                    desist from any further use of the other
                                    Party's Trademarks and any trademarks
                                    confusingly similar thereto, either directly
                                    or indirectly;

                           (ii)     All rights in the Aspect Trademarks granted
                                    to Marquette hereunder shall immediately
                                    revert to Aspect, and all rights in the
                                    Marquette Trademarks granted to Aspect
                                    hereunder shall immediately revert to
                                    Marquette;

                           (iii)    In the event that this Agreement is
                                    terminated for any reason other than a
                                    material breach or material default by
                                    Marquette, Marquette shall thereafter to
                                    dispose of all of the unsold Marquette
                                    Patient Monitors bearing the Trademarks and
                                    advertising and promotional



                                      -21-
<PAGE>   22
  Confidential Materials omitted and filed separately with the Securities and
                Exchange Commission. Asterisks denote omissions.


                                    materials relating thereto which had been
                                    completed by it prior to such termination,
                                    provided such Marquette Patient Monitors and
                                    materials were in the process of manufacture
                                    before such termination.

                  (g)      PROMOTIONAL CLAIMS. The general form of any
                           promotional claims by Marquette regarding Aspect's
                           Bispectral Index technology and/or the integration of
                           Aspect's Bispectral Index technology in Marquette
                           Patient Monitors, and the specific form of the use of
                           Aspect's trade names and trademarks, and of intended
                           use claims regarding Aspect's Bispectral Index
                           technology, in promotional material, advertisement,
                           and/or in written technical literature shall be
                           subject to review and approval by Aspect prior to its
                           publication or display. The general form of any
                           promotional claims by Aspect regarding Marquette's
                           Patient Monitors or the integration of Aspect's
                           Bispectral Index technology in Marquette Patient
                           Modules, and the specific form of the use of
                           Marquette's trade names and Trademarks, and of
                           intended use claims regarding the Marquette BIS/EEG
                           Modules, in promotional material, advertisement,
                           and/or in written technical literature shall be
                           subject to review and approval by Marquette prior to
                           its publication or display.

21.      EXPORT.

Marquette shall not export, directly or indirectly, Aspect Products (including
when integrated into a Marquette Patient Monitor) or other products, information
or materials provided by Aspect hereunder, to any country for which the United
States requires any export license or other governmental approval at the time of
export without first obtaining such license or approval. It shall be Marquette's
responsibility to comply with the latest United States export regulations, and
Marquette shall defend and indemnify Aspect from and against any damages, fines,
penalties, assessments, liabilities, costs and expenses (including reasonable
attorneys' fees and court costs) arising out of any claim that Marquette Patient
Monitors or other products, information or materials provided by Aspect
hereunder were exported or otherwise shipped or transported in violation of
applicable laws and regulations.

22.      CO-MARKETING PROGRAM.

Marquette and Aspect will undertake co-marketing programs in the future in
certain geographies, including North America, consistent with the goals and
principles outlined in Exhibit F to this Agreement. The Parties further agree to
utilize their best efforts to finalize a definitive co-marketing agreement to
implement the goals outlined in Exhibit F within [**] days following the date on
which this OEM Development and Purchase Agreement is signed by both Parties.





                                      -22-
<PAGE>   23
  Confidential Materials omitted and filed separately with the Securities and
                Exchange Commission. Asterisks denote omissions.



23.      TERM; DEFAULT AND TERMINATION.

         23.1     TERM AND RENEWAL. The initial term of this Agreement shall
                  commence on the Effective Date and shall continue for a period
                  of three (3) years following introduction of the Marquette
                  BIS/EEG Module. The term of this Agreement shall be renewed
                  automatically for successive twelve (12) month periods, unless
                  either Party provides written notice of termination to the
                  other Party at least sixty (60) days prior to expiration of
                  the Agreement.

         23.2     TERMINATION FOR GOOD CAUSE.

                  (a)      TERMINATION BY ASPECT. The Agreement may be
                           terminated by Aspect giving [**] prior
                           written notice to Marquette in the event Marquette
                           has not commercially introduced a Marquette BIS/EEG
                           Module by October 31, 2001.

                  (b)      TERMINATION BY MARQUETTE. The Agreement may be
                           terminated by Marquette giving [**] written notice
                           to Aspect if Aspect has failed to provide a Aspect
                           BIS/EEG Module Kit consistent with the specifications
                           outlined in Exhibit C to Marquette by December 31,
                           2000. Furthermore, Marquette will require prototype
                           Aspect BIS/EEG Module Kits in advance of the December
                           31, 2000 date, as follows in order to make the date
                           specified in Section 23.2(a): [**] then current
                           Aspect BIS/EEG Module Kit approximately 10-12 weeks
                           after the project commences; [**] then current Aspect
                           BIS/EEG Module Kits approximately five (5) months
                           thereafter; and approximately [**] then current
                           Aspect BIS/EEG Module Kits two (2) months thereafter.
                           Specific schedules and volumes for prototype Aspect
                           BIS/EEG Module Kits will be mutually agreed upon by
                           both Parties to meet the mutual timelines.

                  (c)      MATERIAL COMPETITIVE FEATURES. Either Party may
                           terminate this Agreement if the other Party's [**] do
                           not [**] for [**] the [**] of [**] and [**] on the
                           [**] . In order to exercise its rights under this
                           Section 23.2(c), a Party must provide [**] prior
                           written notice to the other Party, specifying in
                           reasonable detail the [**] or [**] that are [**].
                           Following receipt of such notification, the notified
                           Party shall have [**] to [**] in [**]. If at the end
                           of such [**] period, the notified Party is unable to
                           do so, the notifying Party may terminate the
                           Agreement; provided, that no such notification shall
                           be effective prior to [**].




                                      -23-
<PAGE>   24


         23.3     EVENTS OF DEFAULT. The following shall constitute events of
                  default under this Agreement:

                           (i)      if either Party assigns this Agreement or
                                    any of its rights or obligations hereunder
                                    without the prior written consent of the
                                    respective other Party, except: (a) as
                                    specifically permitted under this Agreement;
                                    or (b) in connection with the sale or other
                                    transfer of such Party's business to which
                                    this Agreement relates (the word "assign" to
                                    include, without limiting the generality
                                    thereof, a transfer of a majority interest
                                    in the Party) or

                           (ii)     if either Party shall neglect or fail to
                                    perform or observe any of its obligations to
                                    the other Party hereunder, including,
                                    without limiting the generality thereof, the
                                    timely payment of any sums due, and such
                                    failure is not cured within thirty (30) days
                                    (ten (10) days in the event of a default in
                                    the payment of amounts owed the other Party)
                                    after written notice thereof from the other
                                    Party; or

                           (iii)    if there is (w) a dissolution, termination
                                    of existence, liquidation, insolvency or
                                    business failure of either Party, or the
                                    appointment of a custodian or receiver of
                                    any part of either Party's property, if such
                                    appointment is not terminated or dismissed
                                    within thirty (30) days; (x) a composition
                                    or an assignment or trust mortgage for the
                                    benefit of creditors by either Party; (y)
                                    the commencement by either Party of any
                                    bankruptcy proceeding under the United
                                    States Bankruptcy Code or any other federal
                                    or state bankruptcy, reorganization,
                                    receivership, insolvency or other similar
                                    law affecting the rights of creditors
                                    generally; or (z) the commencement against
                                    either Party of any proceeding under the
                                    United States Bankruptcy Code or any other
                                    federal or state bankruptcy, reorganization,
                                    receivership, insolvency or other similar
                                    law affecting the rights of creditors
                                    generally, which proceeding is not dismissed
                                    within thirty (30) days ("File for
                                    Bankruptcy").

         23.4     REMEDIES. Upon any event of default, and in addition to any
                  other remedies either Party may have at law or in equity, the
                  non-defaulting Party may terminate the Agreement, cancel any
                  outstanding Order, refuse to make or take further Orders or
                  deliveries, cancel any discount given, and declare all
                  obligations immediately due and payable. Any such termination
                  or other action taken by the non-defaulting Party pursuant to
                  this Section 23.4 shall not relieve the defaulting Party of
                  its obligations hereunder and the non-defaulting Party shall
                  retain all legal and equitable remedies after such
                  termination.



                                      -24-
<PAGE>   25

  Confidential Materials omitted and filed separately with the Securities and
                Exchange Commission. Asterisks denote omissions.


24.      INSURANCE.

Upon request, Aspect shall provide evidence of product liability, general
liability and property damage insurance against an insurable claim or claims
which might or could arise regarding Aspect products purchased from Aspect. Such
insurance shall contain a minimum limit of liability for bodily injury and
property damage of not less than 2,000,000 (two million) US$.

25.      SOURCE CODE ESCROW

         25.1     Escrow Agent. Aspect warrants that the entire source code for
                  Software, together with all Documentation, as now exists or
                  hereafter becomes available including but not limited to, the
                  then current version(s) of Software necessary for the use,
                  maintenance, modification and enhancement of the Marquette
                  BIS/EEG Module will have been deposited and maintained at
                  Marquette's expense in an escrow account (the "Escrow
                  Account") pursuant to an agreement between an escrow agent
                  (the "Escrow Agent"), which Escrow Agent is reasonably
                  satisfactory to Marquette, and Aspect (the "Escrow
                  Agreement"). Such Escrow Agent shall be instructed to certify
                  in writing to Marquette within thirty (30) days from the
                  execution date hereof that such source code and Documentation
                  have been delivered to it. Such Escrow Agent shall be
                  instructed in writing by Aspect upon execution hereof to
                  deliver all such Software and Documentation to Marquette upon
                  written notice thereof by Marquette promptly after any of the
                  following occurrences:

                  (a)      Aspect fails to repair or maintain the Software as it
                           is required to do under Sections 11 and 12.4 of this
                           Agreement;

                  (b)      Aspect suspends or discontinues business or indicates
                           its intention to suspend or discontinue business.

         25.2     Marquette's Right To Use Source Code. Upon the occurrence of
                  any of the above, Marquette shall have the right to use such
                  source code and Documentation solely to use, maintain,
                  support, or enhance the Marquette BIS/EEG Module.

         25.3     Verification. Marquette shall have the right to verify at any
                  time, at its own cost, that the applicable version(s) of
                  Software is so deposited; and the right to engage a mutually
                  acceptable third party to test the Software source code to
                  assure Marquette that it is the applicable version(s) and that
                  it complies.

         25.4     Disputes. Should there be any dispute as to whether Marquette
                  shall be entitled to receive any such source code and
                  Documentation, then such dispute shall be resolved in
                  accordance with the terms and conditions set forth in Section
                  26 (Dispute Resolution) of this Agreement.


                                      -25-
<PAGE>   26

26.      DISPUTE RESOLUTION

         26.1     GENERAL. Any dispute, controversy or claim arising out of or
                  relating to this Agreement or any related agreement or the
                  validity, interpretation, breach or termination thereof (a
                  "Dispute"), including claims seeking redress or asserting
                  rights under applicable law, shall be resolved in accordance
                  with the procedures set forth herein. Until completion of such
                  procedures, no Party may take any action not contemplated
                  herein to force a resolution of the Dispute by any judicial or
                  similar process, except to the limited extent necessary to;
                  (i) avoid expiration of a claim that might eventually be
                  permitted hereby; or (ii) obtain interim relief, including
                  injunctive relief, to preserve the status quo or prevent
                  irreparable harm.

         26.2     WAIVER. In connection with any Dispute, the parties expressly
                  waive and forego any right to (i) punitive, exemplary,
                  statutorily, enhanced or similar damages in excess of
                  compensatory damages and (ii) trial by jury.

         26.3     GOOD FAITH NEGOTIATIONS. Any Dispute relating to this
                  Agreement (a "Dispute") will be resolved first through good
                  faith negotiations between appropriate management-level
                  representatives of each Party having responsibility for the
                  sale or use of products involved.

         26.4     MEDIATION. If within sixty (60) day the parties are unable to
                  resolve the dispute through good faith negotiation, either
                  Party may submit a Dispute for resolution by mediation
                  pursuant to the Center for Public Resources Model Procedure
                  for Mediation of Business Disputes as then in effect. The
                  mediation shall be conducted in New York City. Mediation will
                  continue for at least thirty (30) days unless the mediator
                  chooses to withdraw sooner. At the request of either Party,
                  the mediator will be asked to provide an evaluation of the
                  Dispute and the parties' relative positions. Each Party shall
                  bear its own costs of mediation effort.

         26.5     ARBITRATION. After completion of any mediation effort, a Party
                  may submit the Dispute for resolution by arbitration pursuant
                  to the Non-Administered Arbitration Rules of the Center for
                  Public Resources as in effect on the date hereof, unless the
                  parties agree to adopt such rules as in effect at the time of
                  the arbitration. The arbitral tribunal shall be composed of
                  one arbitrator; and the arbitration shall be conducted in New
                  York. If the resolution of the Dispute is not found within the
                  terms of this Agreement, the arbitrator shall determine the
                  Dispute in accordance with the governing law of the Agreement,
                  without giving effect to any conflict of law rules or other
                  rules that might render such law inapplicable or unavailable.
                  The prevailing Party in any arbitration conducted under this
                  Section shall be entitled to recover from the other Party (as
                  part of the arbitral award or order) its reasonable attorneys'
                  fees and other costs of arbitration.

         26.6     APPLICABLE LAW. The law applicable to the validity of this
                  arbitration provision, the conduct of the arbitration, the
                  challenge to or enforcement of any arbitral award or order or
                  any other question of arbitration law or procedure shall be




                                      -26-

<PAGE>   27

                  governed exclusively by the Federal Arbitration Act, 9 U.S.C.
                  sections 1-16; however, the award can be modified or vacated
                  on grounds cited in the Federal Arbitration Act or, if the
                  arbitrator's findings of facts are not supported by
                  substantial evidence or the conclusions of law are erroneous,
                  under the laws of the State of New York. The place of
                  arbitration shall be in New York City. The parties agree that
                  the federal and state courts located in the State of New York
                  shall have exclusive jurisdiction over any action brought to
                  enforce this arbitration provision, and each Party irrevocably
                  submits to the jurisdiction of said courts. Notwithstanding
                  the foregoing sentence, either Party may apply to any court of
                  competent jurisdiction, wherever situated, for enforcement of
                  any judgment on an arbitral award.

         26.7     TIME LIMIT. Except as time barred under any applicable statute
                  of limitation of lesser duration, any claim by either Party
                  shall be time-barred unless the asserting Party commences an
                  arbitration proceeding with respect to such claim within two
                  years after the cause of action has accrued.

         26.8     PROVISIONAL OR INTERIM JUDICIAL MEASURES. Notwithstanding any
                  other provision of this Agreement, the parties expressly agree
                  that prior to the first meeting of the arbitrator either shall
                  have the right to apply to any state or federal court in the
                  State of New York or any other court that would otherwise have
                  jurisdiction, for provisional or interim measures.

         26.9     CONSOLIDATED PROCEEDINGS. Each Party hereby consents to a
                  single, consolidated arbitration proceeding of multiple
                  claims, or claims involving more than two parties. The
                  prevailing Party or parties in any arbitration conducted under
                  this paragraph shall be entitled to recover from the other
                  Party or parties (as part of the arbitral award or order) its
                  or their reasonable attorneys' fees and other reasonable costs
                  of arbitration.

27.      GENERAL PROVISIONS.

         27.1     FORCE MAJEURE. In the event that either Party is prevented
                  from performing, or is unable to perform, any of its
                  obligations under this Agreement due to any act of God, fire,
                  casualty, flood, war, strike, lock out, failure of public
                  utilities, injunction or any act, exercise, assertion or
                  requirement of governmental authority, epidemic, destruction
                  of production facilities, insurrection, inability to procure
                  materials, labor, equipment, transportation or energy
                  sufficient to meet manufacturing needs, or any other cause
                  beyond the reasonable control of the Party invoking this
                  provision, and if such Party shall have used its best efforts
                  to avoid such occurrence and minimize its duration and has
                  given prompt written notice to the other Party, then the
                  affected Party's performance shall be excused and the time for
                  performance shall be extended for the period of delay or
                  inability to perform due to such occurrence.




                                      -27-
<PAGE>   28
  Confidential Materials omitted and filed separately with the Securities and
                Exchange Commission. Asterisks denote omissions.

         27.2     PUBLICITY. Neither Party shall originate any publicity, news
                  release or other public announcement relating to this
                  Agreement or the existence of an arrangement between the
                  Parties without the prior written approval of the other Party,
                  except as otherwise required by law.

         27.3     WAIVER. The waiver by either Party of a breach or a default of
                  any provision of this Agreement by the other Party shall not
                  be construed as a waiver of any succeeding breach of the same
                  or any other provision, nor shall any delay or omission on the
                  part of either Party to exercise or avail itself of any right,
                  power or privilege that it has, or may have hereunder, operate
                  as a waiver of any right, power or privilege by such Party.

         27.4     NO AGENCY. Nothing contained in this Agreement shall be deemed
                  to constitute either Party as the agent or representative of
                  the other Party, or both Parties as joint venturers or
                  partners for any purpose. Neither Party shall be responsible
                  for the acts or omissions of the other Party, and neither
                  Party shall have authority to speak for, represent or obligate
                  the other Party in any way without prior written authority
                  from the other Party.

         27.5     SURVIVAL OF OBLIGATIONS. All obligations of either Party under
                  Sections 4.3 (but only insofar as it relates to the rights of
                  Marquette customers to continue using Marquette BIS/EEG
                  Modules), 5 (Royalties), 11 (Warranty), 12 (Service and
                  Support), 14 (Regulatory Matters), 16 (Ownership and
                  Protection of Results), 18 (Confidentiality), 19
                  (Indemnities), 20 (Trademarks), 25 (Source Code Escrow), 26
                  (Dispute Resolution), and 27.6 (Limitation on Liability) shall
                  survive the expiration or termination of this Agreement and
                  continue to be enforceable.

         27.6     LIMITATION ON LIABILITY. EXCEPT AS PROVIDED IN SECTION 19,
                  EACH PARTY'S LIABILITY ARISING OUT OF THE MANUFACTURE, SALE OR
                  SUPPLYING OF ASPECT PRODUCTS OR THEIR USE OR DISPOSITION,
                  WHETHER BASED UPON WARRANTY, CONTRACT, TORT OR OTHERWISE,
                  SHALL NOT EXCEED THE SUM OF (i) THE TOTAL ACTUAL PURCHASE
                  PRICE PAID BY MARQUETTE FOR ALL ASPECT PRODUCTS PURCHASED
                  HEREUNDER; (ii) ALL AMOUNTS PAID BY MARQUETTE TO ASPECT FOR
                  PROJECT DEVELOPMENT COSTS PURSUANT TO SECTION 3.4 OF THIS
                  AGREEMENT; AND (iii) ALL AMOUNTS PAID BY MARQUETTE TO ASPECT
                  FOR SERVICE AND SUPPORT PURSUANT TO SECTION 12 OF THIS
                  AGREEMENT. IN NO EVENT SHALL EITHER PARTY BE LIABLE TO THE
                  OTHER PARTY FOR SPECIAL, INCIDENTAL, CONSEQUENTIAL, OR OTHER
                  INDIRECT DAMAGES (INCLUDING, BUT NOT LIMITED TO, LOSS OF
                  PROFITS, LOSS OF DATA OR LOSS OF USE DAMAGES) ARISING OUT OF
                  THE MANUFACTURE, SALE OR SUPPLYING OF ASPECT PRODUCTS.




                                      -28-
<PAGE>   29

         27.7     SEVERABILITY. In the event that any provision of this
                  Agreement is held by a court of competent jurisdiction to be
                  unenforceable because it is invalid or in conflict with any
                  law of any relevant jurisdiction, the validity of the
                  remaining provisions shall not be affected and the rights and
                  obligations of the Parties shall be construed and enforced as
                  if the Agreement did not contain the particular provisions
                  held to be unenforceable.

         27.8     GOVERNING LAW. This Agreement shall be governed by and
                  construed in accordance with the laws of the Commonwealth of
                  Massachusetts, without reference to conflict of laws
                  principles, and shall not be governed by the U.N. Convention
                  on Contracts for the International Sale of Goods.

         27.9     NOTICES. Any notice or communication with regard to the
                  termination of or changes to this Agreement from one Party to
                  the other shall be in writing and either personally delivered
                  or sent via certified mail, postage prepaid and return receipt
                  requested addressed, to such other Party at the address of
                  such Party specified in this Agreement or such other address
                  as either Party may from time to time designate by notice
                  hereunder.

         27.10    ENTIRE AGREEMENT. This Agreement constitutes the entire
                  agreement between the Parties. No waiver, consent,
                  modification or change of terms of this Agreement shall bind
                  either Party unless in writing signed by both Parties, and
                  then such waiver, consent, modification or change shall be
                  effective only in the specific instance and for the specific
                  purpose given. There are no understandings, agreements,
                  representations or warranties, expressed or implied, not
                  specified herein regarding this Agreement or the Aspect
                  Products purchased and/or licensed hereunder. Only the terms
                  and conditions contained in this Agreement shall govern the
                  transactions contemplated hereunder, notwithstanding any
                  additional, different or conflicting terms which may be
                  contained in any Order or other document provided by one Party
                  to the other. Failure of Aspect to object to provisions
                  contained in any Order or other document provided by Marquette
                  shall not be construed as a waiver of the terms and conditions
                  of this Agreement nor an acceptance of any such provision.

         27.11    HEADINGS. Captions and headings contained in this Agreement
                  have been included for ease of reference and convenience and
                  shall not be considered in interpreting or construing this
                  Agreement.




                                      -29-
<PAGE>   30

         27.12    EXHIBITS: The following Exhibits shall be part of this
                  Agreement:

                  EXHIBIT A:    Aspect Products and Purchase Prices

                  EXHIBIT B:    Aspect's Standard BIS Module Kit

                  EXHIBIT C:    Development Project

                  EXHIBIT D:    Contact Persons/Addresses Prices

                  EXHIBIT E:    Aspect and Marquette Trademarks

         27.13    BENEFICIARIES. Except for the provisions of Section 19 hereof,
                  which are also for the benefit of the other Persons
                  indemnified, this Agreement is solely for the benefit of the
                  parties hereto and their respective affiliates, successors in
                  interest and permitted assigns and shall not confer upon any
                  other person any remedy, claim, liability, reimbursement or
                  other right in excess of those existing without reference to
                  this Agreement.

         27.14    ASSIGNMENT. Neither Party may assign or delegate this
                  Agreement or any rights or obligations under this Agreement
                  without the prior written consent of the other, which shall
                  not be unreasonably withheld; provided, however, that
                  Marquette may, without the prior written consent of Aspect,
                  assign and delegate this Agreement and any or all of its
                  rights and obligations hereunder to any of its affiliates
                  within the GE Medical Systems division of General Electric
                  Company, and provided that either party shall have the right
                  to assign this Agreement in connection with a sale of the
                  business of such party to which this Agreement relates.

         IN WITNESS WHEREOF, this Agreement has been duly executed as a sealed
instrument as of the date specified above.


Aspect Medical Systems, Inc.                 GE Marquette Medical Systems, Inc.


By: /s/ J. Breckenridge Engle                By: /s/ Kevin King
    ------------------------------               ------------------------------
    J. Breckenridge Engle                        Kevin King

Title: Chairman                              Title: Vice President and
       ---------------------------                  General Manager of
                                                    Global Marketing
                                                    ---------------------------



                                      -30-
<PAGE>   31
  Confidential Materials omitted and filed separately with the Securities and
                Exchange Commission. Asterisks denote omissions.



                                    EXHIBIT A
                       ASPECT PRODUCTS AND PURCHASE PRICES

A)       ASPECT BIS/EEG MODULE KIT:

         Within thirty (30) days of the date of this Agreement, Marquette shall
[**] of the following [**] by giving Aspect written notice [**].

         [**]:

         List price for Aspect BIS/EEG Module Kit: [**] (includes [**] for
         components and [**] for BIS license)

         Volume discounts:

<TABLE>
<CAPTION>

- --------------------------------------------------------------------------------
              QUANTITY
              PER YEAR         PRICE (COMPONENTS + LICENSE          DISCOUNT
              --------         ---------------------------          --------
          <S>                             <C>                         <C>

                [**]                      [**]                        [**]
                [**]                      [**]                        [**]
                [**]                      [**]                        [**]
</TABLE>
- --------------------------------------------------------------------------------

         Exceptions to [**].

         [**]: Assumes [**] of [**] and [**]:

         [**] (based on installed base of approximately [**] GE Marquette OR
         monitors at [**] /unit)

         [**] volume discounts according to the following schedule:


<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------
              QUANTITY
              PER YEAR         PRICE (COMPONENTS ONLY)         DISCOUNT
              --------         -----------------------         --------
          <S>                             <C>                    <C>


                [**]                      [**]                   [**]
                [**]                      [**]                   [**]
                [**]                      [**]                   [**]
</TABLE>
- --------------------------------------------------------------------------------


                                      -31-
<PAGE>   32
  Confidential Materials omitted and filed separately with the Securities and
                Exchange Commission. Asterisks denote omissions.


         Composite volume discount schedule [**] - for illustration
         purposes only:

<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------
                                           PRICE                     DISCOUNT
                                        (COMPONENTS                 (COMPONENTS
                QUANTITY                AND LICENSE                AND LICENSE)
                PER YEAR                   NOTE A                      NOTE A
                --------                -----------                ------------
          <S>                               <C>                         <C>

                  [**]                      [**]                        [**]
                  [**]                      [**]                        [**]
                  [**]                      [**]                        [**]

</TABLE>
- --------------------------------------------------------------------------------

         Note A: assumes imputed BIS license fee of  [**]  per unit

B)       ASPECT BIS SENSOR:

         Transfer price to Marquette for distribution solely to Marquette
customers outside North America and solely for use with Marquette BIS/EEG
Modules: [**] of Aspect's list price in the U.S.

C)       ASPECT SPARE PARTS/ACCESSORY PRICES


<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------
                                         Aspect                     Marquette
         Orderable                     List Price                     Price
         Parts/Products                   (US$)                  (US$) - Note A
         --------------                ----------                --------------
         <S>                              <C>                         <C>

         DSC-2                            [**]                        [**]
         (replacement

         BIC Engine PCB                   [**]                        [**]
         (replacement)

         Sensor Cable                     [**]                        [**]
         (replacement)

         DSC-4                            [**]                        [**]
         (replacement)

         User Manual                      [**]                        [**]

</TABLE>
- --------------------------------------------------------------------------------

                                      -32-
<PAGE>   33
  Confidential Materials omitted and filed separately with the Securities and
                Exchange Commission. Asterisks denote omissions.


                       EXHIBIT B: SPECIFICATIONS ASPECT'S
                             STANDARD BIS MODULE KIT

Aspect's BIS Module Kit is designed specifically for OEM applications and allows
the integration of Aspect's BIS monitoring technology into OEM equipment. The
BIS Engine will interface to the patient via the Aspect BIS sensor and to the
OEM equipment utilizing a serial (RS-232) 3-wire interface and the necessary
power connections.

The BIS Module Kit consists of a Digital Signal Converter (DSC-2) that is placed
in proximity to the patient and a small circuit board that resides in the OEM
equipment. The DSC-2 is a small (palm sized) front-end to the BIS Engine circuit
board that provides the patient interface and performs the high performance
analog to digital conversion of the EEG signals. The EEG signals are transmitted
in digital format from the DSC-2 to the BIS engine circuit board via a 12 foot
cable that is hard wired at the DSC-2.

The small BIS Engine circuit board performs digital signal processing on the
digitized EEG signal and outputs the Bispectral Index to the OEM system via the
RS-232 serial connection. The board is constructed using double-sided surface
mount techniques. The connections to the BIS Engine circuit board are a serial
interface (RS-232), power, and DSC connections.

DETAILED TECHNICAL SPECIFICATIONS:

Digital Output:                     [**]
Main Parameters:                    [**]
Electrical Safety:                  [**]
Power:                              [**]
Artifact Rejection:                 [**]
Bispectral Index:                   [**]

DIGITAL SIGNAL CONVERTER (DSC-2)

Description:                        [**]
Weight:                             [**]
Dimensions:                         [**]
                                    [**]
Cable Length:                       [**]





                                      -33-
<PAGE>   34
  Confidential Materials omitted and filed separately with the Securities and
                Exchange Commission. Asterisks denote omissions.


         (a)      BIS Engine PCB

Physical:                           [**]
Processing Power:                   [**]

         (b)      Software Upgrades

The BIS engine software is stored in reprogrammable FLASH memory. Software
upgrades can be accomplished on-site or remotely via the serial interface.

         (c)      Serial Identifier

Each BIS engine is given a unique serial identifier. This allows for electronic
identification/tracking of every BIS Engine.




                                      -34-
<PAGE>   35
  Confidential Materials omitted and filed separately with the Securities and
                Exchange Commission. Asterisks denote omissions.


                        EXHIBIT C: DEVELOPMENT PROJECT -
                               PRELIMINARY OUTLINE

1.       SCOPE

This preliminary outline describes a development project that Aspect would
perform for GE Marquette. This outline is based on notes from a meeting held at
Aspect on August 18, 1999. A more detailed project description needs to be
completed before the timetable and costs can be finalized.

2.       DEVELOPMENT TIMETABLE

A detailed project schedule needs to be developed. It is planned that the total
elapsed time of the project will be approximately [**].

3.       SOFTWARE PROJECT - [**]

Expanded BIS Engine Software Functionality: Aspect will [**] so that, in
addition to all of the functionality of the standard BIS Module Kit (described
in Attachment A), the system will [**] when a [**] is connected to the BIS
Engine circuit board. Upon connection of the [**], the BIS software will
automatically [**] processing. The BIS engine will then [**] including [**]. The
BIS engine will then transmit these [**] to the host system via the [**].

4.       TASKS

         Determine and Specify:
                  System Specifications (Aspect/GE Marquette) including hazard
                  analysis Software Specifications (Aspect)
         Develop/Implement (Aspect)
         Verification & Validation (Aspect)

After Aspect has validated the BIS/EEG module kit, GE Marquette will have the
responsibility to validate, with Aspect's assistance, the BIS/EEG module in the
GE Marquette system.

The approximate cost to complete this software project is [**].

DSC-4 Hardware Development Project

Conceptually, Aspect will [**] the [**] that is [**] . However, this [**]. A
preliminary review indicates that [**]. Additionally, there may be [**].
Therefore a small development budget needs to be established in order to bring
this product back on-line. An estimate of the project cost including engineering
and tooling is roughly [**]. A full review of the manufacturability of the DSC-4
needs to be completed before Aspect can commit to the actual development expense
and the transfer price of the DSC-4.





                                      -35-
<PAGE>   36
  Confidential Materials omitted and filed separately with the Securities and
                Exchange Commission. Asterisks denote omissions.


                      EXHIBIT D: CONTACT PERSONS/ADDRESSES

CONTACT PERSONS AND RESPONSIBILITIES AT ASPECT:

<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------------------------
                                                                              EMAIL
                                                                              PHONE NUMBER/
PERSON                     TITLE                    RESPONSIBILITY            FAX NUMBER
<S>                        <C>                     <C>                       <C>
- --------------------------------------------------------------------------------------------------
[**]                       [**]                     [**]                      [**]
                                                                              [**]
                                                                              [**]
- --------------------------------------------------------------------------------------------------
[**]                       [**]                     [**]                      [**]
                                                                              [**]
                                                                              [**]
- --------------------------------------------------------------------------------------------------
[**]                       [**]                     [**]                      [**]
                                                                              [**]
                                                                              [**]
- --------------------------------------------------------------------------------------------------
[**]                       [**]                     [**]                      [**]
                                                                              [**]
                                                                              [**]
- --------------------------------------------------------------------------------------------------
[**]                       [**]                     [**]                      [**]
                                                                              [**]
                                                                              [**]
- --------------------------------------------------------------------------------------------------
</TABLE>


MAILING ADDRESS:   Aspect Medical Systems, Inc.
                   2 Vision Drive
                   Natick, MA 01760-2059
                   USA

CONTACT PERSONS AND RESPONSIBILITIES AT GE MARQUETTE:

<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------------------------
                                                                              EMAIL
                                                                              PHONE NUMBER/
PERSON                     TITLE                    RESPONSIBILITY            FAX NUMBER
<S>                        <C>                     <C>                       <C>
- --------------------------------------------------------------------------------------------------

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

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

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

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

- --------------------------------------------------------------------------------------------------
</TABLE>

MAILING ADDRESS:  GE Marquette Medical Systems, Inc.



                                      -36-
<PAGE>   37

                          EXHIBIT E: ASPECT TRADEMARKS


TRADEMARK                               REFERENCE
- ---------                               ---------

Aspect(R)                               None*

A-2000(TM)                              A-2000 is a trademark of Aspect Medical
                                        Systems, Inc.

Bispectral Index(R)                     Bispectral is a registered trademark of
                                        Aspect Medical Systems, Inc.

                                        BIS logo is a registered trademark of
                                        Aspect Medical Systems, Inc.



*   This trademark is registered as a trademark to another company, and is used
    under license by Aspect Medical Systems.





                                      -37-
<PAGE>   38
  Confidential Materials omitted and filed separately with the Securities and
                Exchange Commission. Asterisks denote omissions.


                         EXHIBIT F: CO-MARKETING PROGRAM

a)    Goals:

      -     to provide GE Marquette customers with access to BIS, and a seamless
            transition from Aspect's A-2000 BIS monitor to GE Marquette's BIS
            Module, during the period in which the BIS module is under
            development by GE Marquette

      -     to ensure that the field organizations of both Aspect and GE
            Marquette are properly incented to assist one another, and to work
            in collaboration, to promote the BIS technology, irrespective of the
            platform on which it is available.

      -     to minimize the likelihood that GE Marquette customers will be
            disposed to delay purchasing BIS until GE Marquette completes the
            development of a BIS module.

      -     to minimize the incremental costs to customers of exchanging one BIS
            platform for another when the module becomes available; and

      -     to encourage existing GE Marquette customers to remain loyal to GE
            Marquette, and to stimulate monitoring system sales to new
            customers, by offering a BIS solution that address current and
            future needs at a very attractive price.

b)    Term: beginning immediately following an announcement by GE Marquette and
      Aspect that GE Marquette intends to develop a BIS module until the module
      is launched. It is understood that the module will be launched
      approximately 2-3 months prior to becoming commercially available.

c)    Proposed Pricing: Aspect list price [**] per monitor. Aspect's current
      list prices vary from [**] per monitor depending on the number of monitors
      purchased. In addition to outright sales, the parties will also make
      available a fee-for-use program using equivalent terms. (Aspect would need
      to do the fee-for-use program - Marquette would just submit the referral
      to Aspect and Marquette would still exchange for the module at no module
      charge.) In exchange, customers will receive A-2000 monitors initially; as
      soon as the BIS module is available, the module will be exchanged for the
      monitor.

d)    Mechanics: following each sale under this program, Aspect will assume
      responsibility for installation, in-service, and clinical support for the
      A-2000. Following release of the BIS Module, Marquette will assume
      responsibility for installation and in-service of the module, at which
      time the used A-2000 will be returned to Aspect.

e)    [**]: proceeds from sale of the BIS platform (i.e. the A-2000 followed by
      the BIS Module) will be [**]. In the event GE Marquette fails to deliver a
      BIS module within a suitable period of time as specified in the Agreement.



                                      -38-
<PAGE>   39
  Confidential Materials omitted and filed separately with the Securities and
                Exchange Commission. Asterisks denote omissions.


f)    Sales rep compensation: it is understood that a compensation program for
      both field organizations will be established that appropriately ties rep
      compensation to success of the program.

g)    Elements of co-marketing program: customer lists to be shared, high
      priority accounts to be jointly identified and developed, co-promotional
      activities to be coordinated (e.g. trade shows, joint seminars and
      customer presentations, etc.); reimbursements to Marquette due quarterly
      with customer lists, selling price, number of sensors purchased by
      customer.

h)    Territory: U.S. and other countries to be discussed.

i)    Possible role of MVP: in the event MVP acts as a distributor for Aspect,
      the terms of their participation in the co-marketing program to be
      negotiated.

j)    Demonstration Equipment: for promotional purposes only (not to be sold to
      any end-user), Marquette will require five (5) demonstration Aspect A-2000
      Monitors. Terms of the transfer price for these demonstration units will
      be negotiated.

k)    BIS Sensor [**]: Marquette [**] BIS Sensors [**] as a result of the [**]
      to a [**].






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