Document:

<PAGE>

                                                                   Exhibit 10.23

                  TRANSFER ASSIGNMENT AND ASSUMPTION AGREEMENT
                         AND FOURTH AMENDMENT AGREEMENT

     This Transfer, Assignment and Assumption Agreement and Fourth Amendment
Agreement (the "Agreement") is executed arid entered into effective as of July
22, 1998 by and among Monitronics International, Inc., a Texas corporation (the
"Company"), the holders (the "Security Holders") of certain obligations and
securities of the Company whose names appear on the signature pages to this
Agreement, and the Lenders (the "Lenders") to the Company under various loan
agreements whose names appear on the signature pages to this Agreement.

                                    RECITALS:

     WHEREAS, James R. Hull ("Hull") owns 942,466 shares ("Hull Shares") of
Class A Common Stock, $.01 par value per share ("Class A Common Stock"), of the
Company; and

     WHEREAS, the Company, the Lenders and the Security Holders are parties to,
among other agreements, the following agreements (collectively, the "Existing
Affected Lender Agreements"): (i) The Second Amended and Restated Pledge
Agreement, dated as of March 13, 1998 (as amended, the "Pledge Agreement"), and
(ii) The Second Amended and Restated Affiliate Subordination Agreement, dated as
of March 13, 1998 (as amended, the "Subordination Agreement"); and

     WHEREAS, pursuant to the Pledge Agreement, the Hull Shares have been
pledged and delivered to the Lenders as collateral security for the obligations
of the Company to the Lenders under the Loan Agreement (as defined in the Pledge
Agreement), all as more particularly described in the Pledge Agreement; and

     WHEREAS, pursuant to the Subordination Agreement, all claims of any kind or
nature of Hull against the Company are made subordinate and junior in right of
payment and exercise of remedies to the claims of the Lenders against the
Company; and

     WHEREAS, Hull desires to transfer (subject to the Pledge Agreement) all
942,466 of the Hull Shares (the "Securities") to Hull Family Limited Partnership
(the "Family Partnership"); and

     WHEREAS, it is a condition to the consent of the Lenders to the transfers
of the Hull Shares that Family Partnership become a party to the Pledge
Agreement and the Subordination Agreement, and

     WHEREAS, Family Partnership desires to accept the transfer of said
Securities to it on such terms, arid become a party to the Pledge Agreement and
the Subordination Agreement, and

     WHEREAS, Hull is a party to various agreements, and the Securities are
subject to various agreements, with the other parties to this Agreement and
Family Partnership desires to assume the duties, obligations and
responsibilities of Hull under said various agreements as they relate to the a
Securities, and desires to have all benefits and rights in favor of or
attributable to

                                      -1-

<PAGE>

the Securities under said various agreements; and

     WHEREAS, the Company and certain of the Security Holders arc parties to the
following agreements (collectively, the "Existing Security Holder Agreements"):
(i) Amended and Restated Shareholders Agreement, dated as of May 10, 1996, as
amended by that certain Amendment Agreement dated as of November 22, 1996 by and
among the Company and certain of the Security Holders (the "First Amendment
Agreement'), as further amended by that certain Second Amendment Agreement dated
as of May 19, 1997 by and among the Company and certain of the Security Holders
(the "Second Amendment Agreement"), as further amended by that certain Transfer,
Assignment and Assumption Agreement and Third Amendment Agreement by and among
the Company and certain of the Security Holders (the "Third Amendment Agreement)
(as so amended, the "Shareholders Agreement"), by arid among the Company, Austin
Ventures III-A, L.P., a Delaware limited partnership ("Austin III-A"), Austin
Ventures III-B, L.P., a Delaware limited partnership ("Austin III-B" and
together with Austin III-A "Austin III"), Capital Resource Lenders II, L.P., a
Delaware limited partnership ("CRL II"), Austin Ventures V. L.P., a Delaware
limited partnership ("Austin V"), Austin Ventures V Affiliates Fund, L.P., a
Delaware limited partnership ("Affiliates Fund"), Hull and Robert N. Sherman
("Sherman"); (ii) Amended and Restated co-Sale Agreement, dated as of May 10,
1996, as amended by the First Amendment Agreement, the Second Amendment
Agreement and Third Amendment Agreement (as so amended, the "Hull Co-Sale
Agreement"), among the Company, CRL II, Austin III, Austin V. Affiliates Fund
and Hull; and (iii) Amended and Restated Affiliate Registration Agreement, dated
May 10, 1996, as amended by the First Amendment Agreement, the Second Amendment
Agreement and Third Amendment Agreement (as so amended, the "Affiliate
Registration Agreement"), between the Company and Hull; and

     WHEREAS, as a result of the transactions contemplated by the transfer of
the Securities by Hull to Family Partnership, the parties hereto desire to amend
the Existing Security Holder Agreements and Existing Affected Lender Agreements.

     NOW THEREFORE, in consideration of the premises and the agreements herein
contained, and intending to be bound hereby, the parties hereby agree as
follows:

     1. Assignment. Assumption and Acknowledgment.

          (a) For good and valuable consideration, the receipt of which is
hereby acknowledged, Hull hereby assigns and transfers, subject to the Pledge
Agreement, all his right, title and interest in all 942,466 of the Hull Shares
to Family Partnership, including any rights permitted to be transferred with
respect to such Securities pursuant to the Existing Security Holder Agreements
and the Existing Affected Lender Agreements, with such transfer and assignment
to be effective as of the date of this Agreement (the "Effective Date"). Family
Partnership shall be bound by the provisions of the Existing Affected Lender
Agreements as of the Effective Date.

          (b) Family Partnership hereby assumes all of the obligations and
commitments of Hull with respect to the Securities assigned and transferred to
Family Partnership arising under the Existing Security Bolder Agreements and the
Existing Affected Lender Agreements accruing on or after the Effective Date.
Notwithstanding Family Partnership

                                      -2-

<PAGE>

becoming a party to the Existing Affected Lender Agreements, Hull shall remain
parry to and bound by the provisions of the Subordination Agreement.

          (c) The Company hereby acknowledges and consents to the transfer of
the Securities as set forth above and agrees to take all necessary action to
reflect such transfer in its books and records.

          (d) Each of Hull, Family Partnership and the Company agrees to execute
any further instruments or perform any such acts which are or may become
reasonably necessary to carry out the intent of this Agreement, including,
without limitation, execution of any documents required to complete the
foregoing transfers and the cancellation and reissuance of certificates
representing such Securities, and any documents required by the Lenders in order
to give effect to the assumption by Family Partnership of Hull's obligations
under the Pledge Agreement and the Subordination Agreement, and to become
parties thereto.

          (e) Each of the Security Holders hereby waives any right of first
refusal or co-sale rights which any of such Security Holders may have with
regard to the assignment and transfer of the Securities by Hull to Family
Partnership and hereby expressly consents to such assignment and transfer.

     2. Addition of Family Partnership as a Part to the Existing Security Holder
Agreements and Existing Affected Lender Agreements. The parties to this
Agreement hereby consent to and approve of the addition of Family Partnership as
a party to the Shareholders Agreement, the Affiliate Registration Agreement, the
Hull Co-Sale Agreement, the Pledge Agreement and the Subordination Agreement,
and acknowledge and agree that Family Partnership shall be bound by all of the
terms and conditions of such agreements, as amended hereby and as from time to
time in effect, and that such terms and conditions shall inure to the benefit of
Family Partnership and Revocable Trust, in each case, to the extent applicable
to Family Partnership with respect to the Securities transferred and assigned to
Family Partnership or as the owner of such Securities.

     3. Amendments to Existing Security Holder Agreements and Existing Affected
Lender Agreements.

          (a) That all references to James R. Hull as a "Common Shareholder" in
the Shareholders Agreement shall now be deemed to be a reference to Family
Partnership so that Family Partnership shall be a "Common Shareholder" for all
purposes in the Shareholders Agreement.

          (b) That paragraph 4K of the Shareholders Agreement is hereby amended
to add Family Partnership to the list of named "Pledgors" and to include the
Securities as "Pledged Securities".

          (c) That all references to "Hull" in the Hull Co-Sale Agreement shall
be deemed to be a reference to Family Partnership.

          (d) That all references to "Shareholder" in the Affiliate Registration
Agreement shall be deemed to be a reference to Family Partnership.

                                      -3-

<PAGE>

          (e) That the Pledge Agreement is amended to remove Hull as a "Pledgor"
and to add Family Partnership as a "Pledgor" and the definition of "Pledged
Stock" thereunder, as well as Schedule I thereof, is amended to include the
942,466 Hull Shares transferred by Hull to Family Partnership, and that the
number of shares of Pledged Stock appearing on Schedule I pledged by Hull is
reduced by the corresponding number of shares. State Street Bank and Trust
Company, as Documentation and Collateral Agent, is hereby authorized to amend
Schedule I to the Pledge Agreement as aforesaid, and to attach such amended
Schedule I to the Pledge Agreement. As so amended, the Pledge Agreement is
hereby ratified by each of the parties hereto.

          (f) That the Subordination Agreement is amended to include Family
Partnership as a "Subordinated Creditor" thereunder.

     4. Miscellaneous.

          (a) Effect. Except as amended hereby, the Existing Security Holder
Agreements and Existing Affected Lender Agreements shall remain in full force
and effect.

          (b) Return of Stock Certificate arid Warrants. Hull hereby requests
that the Lenders upon receipt from Family Partnership of one or more
certificates representing 942,466 shares of the Company's Class A Common Stock,
with a stock power in the form attached hereto duly executed in blank, together
with such other agreements as the Lenders may reasonably require in order to
cause Family Partnership to become a party to the Pledge Agreement and
Subordination Agreement, and such legal opinions as the Lenders may reasonably
require in connection therewith, to cancel and deliver Certificate Nos. 8 and
21, representing 33,061 and 909,405 shares of Class A Common Stock,
respectively, issued in the name of Hull, to the Company. Hull hereby appoints
the Company as his agent to cause such transfer and reissuance of certificates
to be accomplished. Family Partnership hereby agrees to execute and deliver to
State Street Bank and Trust Company the form of Stock Power of Attorney attached
to this Agreement. Family Partnership hereby directs the Company to deliver the
new stock certificate directly to State Street Bank and Trust Company upon
issuance thereof.

          (c) Waivers. Each of the parties hereto waives any right to object to
the transfer of the Securities from Hull to Family Partnership pursuant to any
contractual right or under any other theory.

          (d) Descriptive Headings. The descriptive headings in this Agreement
are inserted for convenience only and do not constitute a part of this Agreement

          (e) Governing Law. The construction, validity and interpretation of
this Agreement will be governed by and construed in accordance with the domestic
laws of the State of Texas without giving effect to any choice of law or
conflict of law provision or rule (whether of the State of Texas or any other
jurisdiction) that would cause the application of the laws of any jurisdiction
other than the State of Texas.

          (f) Counterparts. This Agreement may be executed in any number of
counterparts, all of which taken together shall constitute one and the same
instrument, and each of the panics hereto may execute this Agreement by signing
any such counterpart. Facsimile

                                      -4-

<PAGE>

signatures shall be accepted for all purposes as original signatures.

     IN WITNESS WHEREOF, this Transfer, Assignment and Assumption Agreement and
Fourth Amendment Agreement has been executed by the parties hereto as of the day
and year first above set forth.

                                         COMPANY:

                                         MONITRONICS INTERNATIONAL, INC.

                                         By: /s/ James R. Hull
                                             -----------------------------------
                                             James R. Hull, President

                                         SECURITY HOLDERS:

                                         AUSTIN VENTURES III-A, L.P.

                                         By: AV Partners Ill, L.P.,
                                             Its General Partner

                                         By: /s/  Blaine F. Wesner
                                             -----------------------------------
                                             Blaine F. Wesner,
                                             Authorized Signatory

                                      -5-

<PAGE>

                                         AUSTIN VENTURES III-B, L.P.

                                         By: AV Partners III, L.P.
                                             Its General Partner

                                         By: /s/ Blaine F. Wesner
                                             -----------------------------------
                                             Blaine F. Wesner
                                             Authorized Signatory

                                         AUSTIN VENTURES V, L.P.

                                         By: AV Partners V, L.P.,
                                             Its General Partner

                                         By: /s/ Blaine F. Wesner
                                             -----------------------------------
                                             Blaine F. Wesner,
                                             General Partner

                                         AUSTIN VENTURES V AFFILIATES FUND, L.P.

                                         By: AV Partners V, L.P.,
                                             Its General Partner

                                         By: /s/ Blaine F. Wesner
                                             -----------------------------------
                                             Blaine F. Wesner
                                             General Partner

                                         CAPITAL RESOURCE LENDERS II, L.P.

                                         By: Capital Resources Partners II, L.P.
                                             Its General Partner

                                         By: /s/ Fred C. Danforth
                                             -----------------------------------
                                             General Partner

                                      -6-

<PAGE>

                                             /s/ James R. Hull
                                             -----------------------------------
                                             James R. Hull

                                             /s/ Robert N. Sherman
                                             -----------------------------------
                                             Robert N. Sherman

                                             /s/ Michael Meyers
                                             -----------------------------------
                                             Michael Meyers

                                             /s/ Stephen Hedrick
                                             -----------------------------------
                                             Stephen Hedrick

                                             /s/ Michael Gregory
                                             -----------------------------------
                                             Michael Gregory

                                         HULL FAMILY LIMITED PARTNERSHIP

                                         By: James R. Hull Management Trust
                                             Its General Partner

                                         By: /s/ James R. Hull
                                             -----------------------------------
                                             James R. Hull,
                                             Trustee

                                      -7-

<PAGE>

                                         LENDERS:

                                         CANADIAN IMPERIAL BANK OF
                                         COMMERCE, AS ADMINISTATIVE AGENT

                                         By: /s/ Amy Kothari
                                             -----------------------------------
                                         Its: Executive Director
                                              CIBC Oppenheimer Corp., As Agent

                                         CIBC INC.
                                         AS LENDER

                                         By: /s/ Amy Kothari
                                             -----------------------------------
                                         Its: Executive Director
                                              CIBC Oppenheimer Corp., As Agent

                                         STATE STREET BANK AND TRUST COMPANY,
                                         INDIVIDUALLY AND AS DOCUMENTATION AGENT

                                         By: /s/ illegible signature
                                             -----------------------------------
                                         Its:  Authorized Agent
                                              ----------------------------------

                                         HELLER FINANCIAL, INC.

                                         By: /s/ illegible signature
                                             -----------------------------------
                                         Its:  Authorized Agent
                                              ----------------------------------

                                         BANKBOSTON, N.A.

                                         By: /s/ illegible signature
                                             -----------------------------------
                                         Its:  Authorized Agent
                                              ----------------------------------

                                      -8-

<PAGE>

                             Stock Power of Attorney

     The undersigned assigns and transfers to State Street Bank and Trust
Company, 942,466 shares of Class A Common Stock, $0.01 par value, of Monitronics
International, Inc., a Texas corporation (the "Company"), standing in its name
on the books of the Company and represented by certificate number __, and
irrevocably appoints _________________________ agent to transfer such shares on
the books of the Company. The agent may substitute another to act for it.

Dated: _______________, 199_.

                                         HULL FAMILY LIMITED PARTNERSHIP

                                         By: James R. Hull Management Trust
                                             Its General Partner

                                         By: /s/
                                             -----------------------------------
                                             James R. Hull,
                                             Trustee

                                      -9-<PAGE>

                                                                   Exhibit 10.24

                            FIFTH AMENDMENT AGREEMENT

     This Fifth Amendment Agreement (the "Agreement") is executed and entered
into effective as of March 9, 1999 by and among Monitronics International, Inc.,
a Texas corporation (the "Company"), and the holders (the "Security Holders") of
certain obligations and securities of the Company whose names appear on the
signature pages to this Agreement.

                                    RECITALS:

     The Company and certain of the Security Holders are parties to, among other
agreements, the following agreements (collectively, the "Existing Security
Holder Agreements"): (i) Preferred Stock Subordination Agreement, dated as of
May 10, 1996, as amended by that certain Amendment Agreement dated as of
November 22, 1996 (the "First Amendment Agreement"), that certain Second
Amendment Agreement dated as of May 19, 1997 (the "Second Amendment Agreement"),
that certain Transfer, Assignment and Assumption Agreement and Third Amendment
Agreement dated as of January 1, 1998 (the "Third Amendment Agreement"), and
that certain Transfer, Assignment and Assumption Agreement and Fourth Amendment
Agreement dated as of July 22, 1998 (the "Fourth Amendment Agreement," and
collectively with the First Amendment Agreement, the Second Amendment Agreement
and the Third Amendment Agreement, the "Previous Amendment Agreements") (as so
amended, the "Preferred Subordination Agreement"); (ii) Amended and Restated
Co-Sale Agreement, dated May 10, 1996, as amended by the Previous Amendment
Agreements (as so amended, the "Hull Co-Sale Agreement") among the Company, CRL,
Austin Ventures and James R. Hull ("Hull"); and (iii) Amended and Restated
Co-Sale Agreement, dated May 10, 1996, as amended by the Previous Amendment
Agreements (as so amended, the "Sherman Co-Sale Agreement") among the Company,
CRL, Austin Ventures and Robert N. Sherman.

     The Company and certain of the Security Holders have entered into a Series
C Preferred Stock Purchase Agreement, dated as of February 22, 1999 (the "Series
C Purchase Agreement"), providing, among other things, for the purchase by
certain Security Holders of 1,409,375 shares of Series C Preferred Stock of the
Company (the "Purchasers"). Terms defined in the Series C Purchase Agreement or
in the Articles of Incorporation of the Company, as amended (the "Articles of
Incorporation"), and not otherwise defined herein are used herein with the same
meanings as defined in the Series C Purchase Agreement or in the Articles of
Incorporation, as applicable.

     As a result of the transactions contemplated by the Series C Purchase
Agreement, the parties hereto desire to amend the Existing Security Holder
Agreements.

     In consideration of the premises and the agreements herein contained, and
intending to be bound hereby, the parties hereby agree as follows:

     1. Addition of Purchasers as Parties to the Existing Security Holder
Agreements. The parties to this Agreement hereby consent to and approve of the
addition of the Purchasers as parties to the Preferred Subordination Agreement,
the Hull Co-Sale Agreement and the Sherman Co-Sale Agreement, and acknowledge
and agree that such Purchasers shall be bound by all of the terms and conditions
of such agreements, as amended hereby and as from time to time in

                                       1

<PAGE>

effect, and that such terms and conditions shall inure to the benefit of the
Purchasers. Notwithstanding the foregoing, Windward may transfer and sell shares
of Series C Preferred Stock to Bear, Steams & Co., Inc. or one or more of its
affiliates, as the case may be (collectively, "Bear"), without any restriction
under paragraph IA of the Hull Co-Sale Agreement or the Sherman Co-Sale
Agreement. In the event Windward transfers Series C Preferred Stock to Bear,
Bear shall be deemed a Purchaser for purposes of this Agreement and shall be
bound by all of the terms and conditions of this Agreement, and prior to
registration of any such transfer on the books of the Company, Bear shall
execute an agreement with the parties hereto agreeing to be bound hereby.

     2. Amendments to Existing Security Holder Agreements.

     (a) That the Preferred Subordination Agreement shall be amended by amending
the definitions of the terms "Notes," "Preferred Stock" and "Purchase Agreement"
to read in their entirety as follows:

     "Notes" shall mean the 12.0% Senior Subordinated Notes due June 30, 2006
     issued by the Company pursuant to the Purchase Agreement, and any notes
     issued in exchange therefor or in replacement thereof, as the same may be
     amended, modified or supplemented from time to time.

     "Preferred Stock" shall mean the Company's preferred stock, $.0l par value
     per share, as authorized by the Company's Articles of Incorporation as
     filed and in effect on March 9, 1999, and as the same may be amended from
     time to time.

     "Purchase Agreement" shall mean the Senior Subordinated Note and Warrant
     Purchase Agreement dated as of May 10, 1996 by and among the Company and
     the Purchasers, as supplemented and modified by (i) the Senior Subordinated
     Note and Warrant Purchase Agreement dated as of November 22, 1996 and (ii)
     the Senior Subordinated Note and Warrant Purchase Agreement dated as of May
     19, 1997, as amended by that certain Amendment dated as of March 13, 1998
     and that certain Second Amendment dated as of January 13, 1999, and as such
     agreement may be further amended, modified or supplemented from time to
     time.

     (b) That (i) all references to "Underlying Common Stock" in the Hull
Co-Sale Agreement and the Sherman Co-Sale Agreement shall be deemed to include
the shares of Common Stock issued or issuable upon conversion of the Series C
Preferred Stock, (ii) all references to "Purchasers" in the Hull Co-Sale
Agreement and the Sherman Co-Sale Agreement shall be deemed to include the
Purchasers, and (iii) all references to "Preferred Stock" in the Hull Co-Sale
Agreement and the Sherman Co-Sale Agreement shall be deemed to include the
Series C Preferred Stock.

     (c) That each of the Hull Co-Sale Agreement and the Sherman Co-Sale
Agreement shall be amended so that paragraph 3B(a) of each such agreement is
hereby deleted in its entirety and replaced by the following:

     "This Agreement shall terminate upon the earlier to occur of (i)(A) the
     written agreement of the holders of at least 66 2/3% of the Series C
     Preferred Stock,

                                       2

<PAGE>

     (B) the holders of at least 66 2/3% of the Underlying Common Stock then
     outstanding and (C) the holders of at least 66 2/3% of the Common Stock
     issued and issuable upon exercise of the Warrants, (ii) the acquisition by
     a single purchaser of all of the issued and outstanding shares of the
     Common Stock, Series C Preferred Stock, Warrants, Warrant Shares and the
     Underlying Common Stock or (iii) the closing of a Qualified Public Offering
     (as defined in the Series C Purchase Agreement)."

     3. Miscellaneous.

     (a) Effect. Except as amended hereby, the Existing Security Holder
Agreements shall remain in full force and effect.

     (b) Descriptive Headings. The descriptive headings in this Agreement are
inserted for convenience only and do not constitute a part of this Agreement.

     (c) Consents. Subject to compliance by the Purchasers with the terms of
this Agreement, each of the parties hereto (i) consents to the issuance of the
Shares of Series C Preferred Stock to the Purchasers pursuant to the terms of
the Series C Purchase Agreement and the adoption of the Articles of Amendment,
and (ii) agrees that such issuance and adoption will not constitute a breach or
default under any of the Series A Purchase Agreement, the Series B Purchase
Agreement, the Note Agreement or the Credit Agreement.

     (d) Governing Law. The construction, validity and interpretation of this
Agreement will be governed by and construed in accordance with the domestic laws
of the State of Texas without giving effect to any choice of law or conflict of
law provision or rule (whether of the State of Texas or any other jurisdiction)
that would cause the application of the laws of any jurisdiction other than the
State of Texas

     (e) Counterparts. This Agreement may be executed in any number of
counterparts, all of which taken together shall constitute one and the same
instrument, and each of the parties hereto may execute this Agreement by signing
any such counterpart. Facsimile signatures shall be accepted for all purposes as
original signatures.

                            [Signature Pages Follow]

                                       3

<PAGE>

     IN WITNESS WHEREOF, this Fifth Amendment Agreement has been executed by the
parties hereto as of the day and year first above set forth.

                                    COMPANY:
                                    Monitronics International Inc.

                                    By: /s/ James R. Hull
                                        ----------------------------------------
                                            James R. Hull, President

                                    SECURITY HOLDERS:

                                    Austin Ventures III-A, L.P.

                                    By: AV Partners III, L.P.,
                                        Its General Partner

                                    By:
                                        ----------------------------------------
                                        Blaine F. Wesner,
                                        Authorized Signatory

                                    Austin Ventures 111-B, L.P.

                                    By: AV Partners III, L.P.,
                                        Its General Partner

                                    By:
                                        ----------------------------------------
                                        Blaine F. Wesner,
                                        Authorized Signatory

                                    Austin Ventures V, L.P.

                                    By: AV Partners V, L.P.,
                                        Its General Partner

                                    By
                                        ----------------------------------------
                                        Blaine F. Wesner,
                                        General Partner

                                SIGNATURE PAGE TO
                            FIFTH AMENDMENT AGREEMENT

<PAGE>

     IN WITNESS WHEREOF, this Fifth Amendment Agreement has been executed by the
parties hereto as of the day and year first above set forth.

                                    COMPANY:

                                    Monitronics International, Inc.

                                    By:
                                        ----------------------------------------
                                        James R. Hull, President

                                    SECURITY HOLDERS:

                                    Austin Ventures III-A, L.P.

                                    By: AV Partners III, L.P.,
                                        Its General Partner

                                    By: /s/ Blaine F. Wesner
                                        ----------------------------------------
                                        Blaine F. Wesner,
                                        Authorized Signatory

                                    Austin Ventures III-B, L.P.

                                    By: AV Partners III, L.P.,
                                        Its General Partner

                                    By: /s/ Blaine F. Wesner
                                        ----------------------------------------
                                        Blaine F. Wesner,
                                        Authorized Signatory

                                    Austin Ventures V, L.P.

                                    By: AV Partners V, L.P.,
                                        Its General Partner

                                    By: /s/ Blaine F. Wesner
                                        ----------------------------------------
                                        Blaine F. Wesner
                                        General Partner

                                SIGNATURE PAGE TO
                            FIFTH AMENDMENT AGREEMENT

<PAGE>

                                    Austin Ventures V Affiliates Fund, L.P.

                                    By: AV Partners V, L.P.,
                                        Its General Partner

                                    By: /s/ Blaine F. Wesner
                                        ----------------------------------------
                                        Blaine F. Wesner,
                                        General Partner

                                    Capital Resource Lenders II, L.P.

                                    By: Capital Resource Partners II, L.P.
                                        Its General Partner

                                    By: /s/ Robert C. Ammern
                                        ----------------------------------------

                                        Managing Partner,
                                        ----------------
                                        General Partner

                                    Hull Family Limited Partnership

                                    By: James R. Hull Management Trust
                                        Its General Partner

                                    By: /s/ James R. Hull
                                        ----------------------------------------
                                        James R. Hull, Trustee

                                    /s/ Robert N. Sherman
                                    --------------------------------------------
                                    Robert N. Sherman

                                    /s/ Michael Meyers
                                    --------------------------------------------
                                    Michael Meyers

                                    /s/ Stephen Hedrick
                                    --------------------------------------------
                                    Stephen Hedrick

                                    /s/ Michael Gregory
                                    --------------------------------------------
                                    Michael Gregory

                                SIGNATURE PAGE TO
                            FIFTH AMENDMENT AGREEMENT

<PAGE>

                                    PURCHASERS:

                                    Windward Capital Partners II, L.P.

                                    By: Windward Capital GP II, LLC,
                                        Its General Partner

                                    By: /s/ Peter S. Macdonald
                                        ----------------------------------------
                                        Peter S. Macdonald,
                                        Managing Member

                                    Windward Capital LP II, LLC

                                    By: /s/ Peter S. Macdonald
                                        ----------------------------------------
                                        Peter S. Macdonald,
                                        Managing Member

                                    Capital Resource Lenders II, L.P.

                                    By: Capital Resources Partners II, L.P.
                                        Its General Partner

                                    By: /s/ Robert C. Ammern
                                        ----------------------------------------

                                        Managing Partner,
                                        ----------------
                                        General Partner

                                SIGNATURE PAGE TO
                            FIFTH AMENDMENT AGREEMENT

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00057-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00057-of-00352.parquet"}]]