Document:

<PAGE>

                                                                    EXHIBIT 10.1

                      AMENDMENT TO CONSOLIDATION AGREEMENT

         This Amendment to Consolidation Agreement ("Agreement") dated as of
August 7, 2000 is by and between Clayton W. Williams, Jr., Clayton Williams
Energy, Inc. and others.

                                    RECITALS:

         WHEREAS, the parties hereto, and their predecessors in interest entered
into that certain Consolidation Agreement dated May 13, 1993, which agreement
provided for among other things, certain restrictions and limitations on the
development of minerals and leasehold retained by Clayton W. Williams, Jr. and
the Williams Entities;

         WHEREAS, as a term of the Consolidation Agreement Mr. Williams and the
Williams Entities agreed to certain non-compete provisions upon leaving the
company; and

         WHEREAS, the parties desire to amend and clarify the agreement with
respect to (i) the types of properties which can be developed by Mr. Williams
and the Williams Entities and (ii) extending the term of the non-compete.

         NOW, THEREFORE, in consideration of the premises set forth herein, the
parties agree to amend the terms of the Consolidation Agreement as set forth
below.

          1.   Section 12 (a) shall be deleted in its entirety and the following
               substituted therefor:

               (a)  The Company hereby acknowledges that following the Effective
                    Date certain of the Williams Entities and Mr. Williams will
                    continue to own the properties and assets identified in
                    Exhibit F attached hereto (the "Excluded Properties") and
                    the Company will not have any interest therein, except as
                    provided in this Section 12. The Williams Entities may
                    conduct activities following the Effective Date on that
                    portion of the Excluded Properties which consists of
                    developed acreage currently producing oil and gas and
                    undeveloped acreage held by production ("Unrestricted
                    Acreage"). For purposes hereof, Unrestricted Acreage shall
                    also include (x) mineral interests underlying farms, ranches
                    or other surface enterprises owned on the date hereof or
                    hereafter acquired where a mineral interest is acquired by
                    virtue of the acquisition of the surface estate, and in
                    which the interest in the land was acquired primarily for a
                    surface activity, (y) undivided mineral interests or
                    leasehold interests acquired after the date hereof in land
                    in which an undivided mineral or leasehold interest is owned
                    by Mr. Williams or a Williams Entity on the date hereof, and
                    (z) minerals or leases acquired after the date hereof on
                    lands in which Mr. Williams or a Williams Entity had a
                    leasehold interest and has existing liabilities with respect
                    to such lands to plug or re-plug abandoned wellbores. With
                    respect to that portion of the Excluded Properties which
                    consists of undeveloped acreage not held by production or
                    undeveloped mineral interests (the "Restricted Acreage"),
                    the

<PAGE>

                    Williams Entities may conduct only such activities thereon
                    as are permitted under the terms of Section 12(b) hereof. In
                    addition, the Williams Entities may sell or otherwise
                    dispose of their interests in the Restricted Acreage (the
                    "Option Property") only in accordance with the terms of
                    Section 12(c) hereof (provided, however, that nothing
                    contained in this Section 12 shall (i) prohibit the sale or
                    other disposition of any Option Property pursuant to any
                    judicial order, legal process, execution or attachment if
                    such sale or other disposition is effected without the
                    consent or concurrence of the Williams Entities or (ii)
                    prohibit the sale of mineral interests solely in connection
                    with a sale of the surface estate with which such mineral
                    interests are associated.)

          2.   The Non-Competition Period described in Section 13 (b)(i) shall
               be extended from one year to two years.

          3.   Except as expressly amended herein, all other terms and
               conditions of the Consolidation Agreement shall remain in full
               force and effect.

IN WITNESS WHEREOF, the parties have executed this amendment as of the day and
year first above written, to be effective however on August 7, 2000.

/s/ Clayton W. Williams, Jr.
-----------------------------------------------
Clayton W. Williams, Jr., Individually

CLAYTON WILLIAMS ENERGY, INC.

/s/ L. Paul Latham
-----------------------------------------------
L. Paul Latham,  Executive Vice President

WARRIOR GAS CO.

/s/ L. Paul Latham
-----------------------------------------------
L. Paul Latham,  Vice President

THE WILLIAMS COMPANIES: CLAYTON WILLIAMS
PARTNERSHIP, LTD., CLAJON HOLDING CORPORATION,
CLAJON INDUSTRIAL GAS, INC.

/s/ Clayton W. Williams, Jr.
-----------------------------------------------
Clayton W. Williams, Jr. in the following capacities:
President, Clajon Holding Corporation,
President, Clajon Production Corporation,
General Partner, Clayton Williams Partnership, Ltd.,
Chairman of the Board, Clajon Industrial Gas<PAGE>

                                                                   EXHIBIT 10.23

                      SUBORDINATED SECURED PROMISSORY NOTE

$1,000,000.00                                                 SEPTEMBER 19, 2000

FOR VALUE RECEIVED, receipt of which is hereby acknowledged, EDUCATIONAL
INSIGHTS, INC., a California corporation ("EI"), promises to pay to the order of
BURTON CUTLER and DIANA P. CUTLER, Co-Trustees, Cutler Family Trust UTD May 4,
1989 (the "Holder"), in installments as hereinafter set forth, at 10 South
Middle Ridge Lane, Rolling Hills, California 90274, or such other place as the
Holder shall designate, in lawful money of the United States of America, the
principal sum of One Million Dollars ($1,000,000.00), together with interest
from the date hereof at the rate of Nine and One-half percent (9.5%) per annum
on the unpaid principal balance until paid in full.

1.   PAYMENTS. Subject to the provisions of Section 4 of this Note, the
principal balance plus accrued interest shall be payable in equal monthly
payments of Eighteen Thousand Two Hundred Seventy-four and 70/100 Dollars
($18,274.70), each, until paid in full. Each payment shall be credited first to
accrued but unpaid interest and the balance to principal, and interest shall
cease to accrue on the amount of principal so paid. Interest shall be computed
on the basis of a year of 365 days and the actual number of days elapsed.

2.   PREPAYMENT. EI may prepay all or part of the outstanding principal balance
of this Note, together with all accrued but unpaid interest thereon, at any time
without premium or penalty.

3.   SECURITY AGREEMENT. The obligations of EI under this Note are secured
pursuant to, and this Note is entitled to the benefits and subject to the
conditions of, that certain Subordinated Security Agreement of even date
herewith, by and among EI and Holder, as the same may be amended from time to
time (the "Security Agreement"), and Holder, and its successors and assigns, by
its acceptance hereof, agrees to be bound by the provisions of the Security
Agreement.

4.   SUBORDINATION.

     (a)  THIS INSTRUMENT IS SUBJECT TO THE TERMS OF A SUBORDINATION AGREEMENT
BY BURTON CUTLER AND DIANA P. CURLER, CO-TRUSTEES OF THE CUTLER FAMILY TRUST,
UTD MAY 4, 1989 , IN FAVOR OF WELLS FARGO BUSINESS CREDIT, INC., DATED AS OF
AUGUST 4, 2000.

     (b)  Notwithstanding anything else herein contained to the contrary, the
payment and collection of principal and interest on this Note is subordinated in
right of payment and collection to the prior payment in full of all Senior
Indebtedness of EI, whether outstanding on this date or hereafter created or
incurred, as hereinafter specified. For purposes of this Note, "Senior
Indebtedness" is defined as the principal of and premium and interest on
indebtedness of EI for money borrowed from, or the payment of which has been
guaranteed to, persons, firms, or corporations which regularly engage in the
business of lending money including, without limitation, banks, trust companies,
insurance companies and other financing institutions and charitable trusts,
pension trusts and other investing organizations, evidenced by notes or similar
obligations. This subordination of this Note is on the following terms:

          (1)  In the event of any insolvency or bankruptcy proceedings, or any
     receivership, liquidation, reorganization or other similar proceedings
     pertaining to EI, or to its property, or in the event of any proceedings
     for voluntary liquidation, dissolution or other winding up of EI, then the
     holders of Senior Indebtedness shall be entitled to

                                       1
<PAGE>

     receive payment in full of all principal and interest on all Senior
     Indebtedness before the Holder is entitled to receive any payment on
     account of principal or interest on this Note and, to that end, the holders
     of Senior Indebtedness shall be entitled to receive on application any
     payment or disbursement of any kind or character, whether in cash or in
     property or securities which may be payable or deliverable in any such
     proceedings in respect to the Note, except securities of EI as reorganized
     or readjusted or securities of EI, or any other company, provided for by a
     plan of reorganization or readjustment, the payment of which is subordinate
     to the payment of all Senior Indebtedness which may at the time be
     outstanding;

          (2)  In the event that this Note is declared due and payable before
     its express maturity on the occurrence of an Event of Default as defined
     below (under such circumstances that the provisions of Section 4(a) are not
     applicable), the Holder will be entitled to payment only after there is
     first paid in full on the Senior Indebtedness outstanding at the time this
     Note becomes due and payable because of such Event of Default all principal
     and interest becoming due and payable under the Senior Indebtedness,
     whether according to its terms, by acceleration or otherwise, or payment
     has been provided therefor in a manner satisfactory to the holders of such
     Senior Indebtedness.

          (3)  No present or future holder of Senior Indebtedness will be
     prejudiced in its right to enforce subordination of this Note by any act or
     failure to act on the part of EI. The provisions of this Section 4 are
     solely for the purpose of defining the relative rights of the holders of
     Senior Indebtedness, on the one hand, and the Holder, on the other hand,
     and nothing in this Note will, as between EI and the Holder, impair the
     obligation of EI to pay to the Holder the principal and interest under this
     Note in accordance with its terms, nor will anything in this Note prevent
     the Holder from exercising all remedies otherwise permitted by applicable
     law upon default hereunder subject only to the rights, if any, under this
     Section 4 of holders of Senior Indebtedness to receive cash, property or
     securities otherwise payable or deliverable to the Holder.

          (4)  The Holder shall, as required by the holders of Senior
     Indebtedness from time to time, execute and deliver to them all additional
     documents and instruments of subordination as are not inconsistent with the
     foregoing.

5.   DEFAULT. The following events shall constitute a default hereunder ("Events
of Default"):

     (a)  If EI shall:

          (1)  Admit in writing its inability to pay its debts generally as they
     become due;

          (2)  File a voluntary petition in bankruptcy or to take advantage of
     any insolvency act;

          (3)  Make an assignment for the benefit of its creditors;

          (4)  Consent to the appointment of a receiver of the whole or any
     substantial part of its property;

          (5)  Have an involuntary petition in bankruptcy filed against it which
     is not dismissed within sixty (60) day of the filing thereof;

          (6)  Fail to perform any obligation imposed on it under that "Loan
     Commitment Agreement" among EI and Holder dated September 15, 2000 (the

                                       2
<PAGE>

     Loan Commitment Agreement") and such non-performance is uncured and
     continuing at the expiration of ten (10) days following EI's receipt of
     written notice of such failure; or

          (7)  Fail to perform any obligation imposed on it under the Security
     Agreement and such non-performance is uncured and continuing at the
     expiration of ten (10) days following EI's receipt of written notice of
     such failure;

     (b)  If any installment shall not be paid within ten (10) days after EI's
receipt of written notice of this Event of Default; and

     (c)  If EI shall fail to acquire the HvB Option (as that term is defined in
the Loan Commitment Agreement) within ninety (90) days following the date first
above written.

6.   ACCELERATION; PAYMENT ON ACCELERATION; REMEDIES.

     (a)  If any one or more Events of Default occurs, the Holder, by notice in
writing to EI, may declare the principal of and all accrued interest on all
Notes then outstanding immediately due and payable without further notice or
demand.

     (b)  Upon any such acceleration of the maturity of this Note, subject to
the provisions of Section 4 EI shall, within thirty (30) days pay to the Holder
the entire unpaid principal balance and accrued interest to the date of such
payment.

     (c)  If EI fails to make payment to the Holder as provided in the preceding
Subsection (c), the Holder shall, subject to the provisions of Section 4, be
entitled and empowered to take such measures as may be appropriate to enforce
the EI's obligations under this Note, by judicial proceedings or otherwise. In
the event suit is brought to enforce payment of this Note, the EI shall pay a
reasonable attorney's fee to be fixed by the court.

7.   GENERAL PROVISIONS.

     (a)  The Holder shall not be deemed, by any act of omission or commission,
to have waived any of its rights or remedies hereunder unless such waiver is in
writing and signed by the Holder and then only to the extent specifically set
forth in writing. A waiver with reference to one event shall not be construed as
continuing or as a bar to or waiver of any right or remedy as to a subsequent
event. No delay or omission of the Holder to exercise any right, whether before
or after a default hereunder, shall impair any such right or shall be construed
to be a waiver of any right or default, and the acceptance at any time by the
Holder of any past-due amounts shall not be deemed to be a waiver of the right
to require prompt payment when due of any other amounts then or thereafter due
and payable. All payments shall be made without set-off or counterclaim.

     (b)  The remedies of the Holder as provided herein, or at law or in equity,
shall be cumulative and concurrent, and may be pursued singly, successively or
together at the sole discretion of the Holder, and may be exercised as often as
occasion therefor shall occur; and the failure to exercise any such right or
remedy shall in no event be construed as a waiver or release thereof.

     (c)  This Note shall be governed and construed in accordance with and
pursuant to the laws of the State of California.

                                       3
<PAGE>

     (d)  Upon payment in full of all principal and interest payable hereunder,
this Note shall be surrendered to EI for cancellation.

IN WITNESS WHEREOF, EI, by the undersigned thereunto duly authorized, and
intending to be legally bound hereby, has duly executed and delivered this Note
the day and year first above written.

Educational Insights, Inc.                           [Corporate Seal]
("EI")

By:      /s/ G. REID CALCOTT
  -----------------------------------------
         G. Reid Calcott, President

                                       4

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00017-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00017-of-00352.parquet"}]]