Document:

<PAGE>   1
                                                                   EXHIBIT 10.12

                              AMENDED AND RESTATED
                               GUARANTY AGREEMENT

         This agreement is made and entered into as of the 1st day of September,
2000, by and between AmerAlia, Inc., a Utah corporation whose address is 311
Raleigh Road, Kenilworth, Illinois 60043 ("AmerAlia") and Jacqueline Mars as
trustee for the Jacqueline Badger Mars Trust, whose address is 6885 Elm Street,
McLean, Virginia 22101 (the "Trust") to amend and restate in their entirety
certain previous guaranty agreements entered into between the Trust and AmerAlia
as described in Recital B.

                                    RECITALS

A.       AmerAlia has commenced operations necessary to build a plant for the
         production of sodium bicarbonate on property near Rifle, Colorado (the
         "Rock School Project"), and is seeking permanent financing to permit
         the Company to commence construction activities.

B.       To assist AmerAlia in securing financing for its corporate operations
         and the Rock School Project, the Trust has guaranteed loans to AmerAlia
         from Bank of America, N.A. (previously NationsBank) totaling
         approximately $7,326,000 in principal amount, plus accrued interest,
         and the Trust and AmerAlia have entered into three Guaranty Agreements
         relating to such loans as follows:

         (1)  Guaranty Agreement dated September 13, 1999, relating to a loan of
              approximately $4,200,000 in principal amount (the "Original
              Loan");

         (2)  Guaranty Agreement dated January 21, 2000, relating to a loan of
              approximately $1,000,000 in principal amount; and

         (3)  Guaranty Agreement dated June 30, 2000, relating to a loan of
              approximately $2,126,000 in principal amount (which funds were
              used, in part, to pay accrued interest on the previous loans),

         which are referred to collectively as the "Previous Guaranties."

C.       The Trust's compensation for entering into the Previous Guaranties is
         due and payable only following AmerAlia's announcement of permanent
         financing from TIAA-CREF or other lender, which announcement has not
         been made because the permanent financing has not been secured.

D.       The Original Loan has matured, and the Trust is willing to extend its
         guaranty which will result in the Bank extending the maturity date of
         the Original Loan and the loans involved in the other Previous
         Guaranties, and AmerAlia desires that the Trust extend its guaranty.

E.       The Trust is willing to facilitate the extension of the Original Loan
         and the other loans through September 14, 2001, and to provide for the
         payment of the fees required by the Previous Guaranties and this
         Agreement herein; and

                                                                          Page 1
<PAGE>   2

F.       AmerAlia's board of directors has determined that such an extension, on
         the terms and conditions set forth herein, is in the best interests of
         AmerAlia and its shareholders.

         NOW, THEREFORE, in consideration of the mutual promises and covenants
contained herein, and for other good and valuable consideration the receipt and
sufficiency whereof is hereby acknowledged, AmerAlia and the Trust agree as
follows:

1.       The Previous Guaranties are hereby modified in their entirety and
         incorporated herein. The Previous Guaranties are of no further force or
         effect.

2.       AmerAlia has filed certain loan applications with the Bank, and will
         file such applications as may be necessary for the Bank to extend the
         loans represented by the Previous Guaranties to and until September 14,
         2001.

3.       The Trust will execute and deliver to the Bank such forms as may be
         necessary or appropriate to provide a guaranty for the repayment of
         such loans in a form that is satisfactory to the Bank and to the Trust,
         and is consistent with this Agreement (the "Guaranty").

4.       AmerAlia will apply the net proceeds of any equity financing to repay
         the loans from the Bank, and the amount of the Guaranty will be reduced
         to the extent of such repayments.

5.       AmerAlia will pay the Trust compensation (the "Trust's Fee") for
         executing and delivering the Guaranty to the Bank in an amount equal to
         15% of the actual amount guaranteed, payable in shares of AmerAlia's
         restricted common stock calculated as follows:

         (a)  If AmerAlia issues a public announcement of a commitment for
              permanent financing from any person before the close of business
              on September 14, 2001 (the "Announcement"), AmerAlia will pay the
              Trust's Fee in shares of AmerAlia's restricted common stock valued
              at the average closing price as reported by The Nasdaq Stock
              Market, Inc. SmallCap Market for the 30 days following the
              Announcement. For example, if the amount guaranteed is $7,326,000
              and the average price is $2.50, AmerAlia will issue 439,560 shares
              of restricted common stock to the Trust. The shares will be issued
              to the Trust within three business days of this determination.

         (b)  If AmerAlia does not make the Announcement before the close of
              business on September 14, 2001, AmerAlia will pay the Trust's Fee
              in shares of AmerAlia's restricted common stock valued at the
              average of the ten highest closing prices as reported by The
              Nasdaq Stock Market, Inc. SmallCap Market for the calendar year
              2000 through August 31, 2000 (which average price is $3.34).

6.       If the Trust makes any payment to the Bank under the Guaranty, AmerAlia
         will indemnify and hold the Trust harmless for any such payment, and
         for all other costs and expenses, including reasonable attorneys' fees
         incurred in connection therewith.

7.       The Trust acknowledges that such shares, when issued, will be
         restricted as that term is defined in Rule 144 of the Rules and
         Regulations promulgated by the Securities and Exchange Commission. The
         Trust further acknowledges, represents and warrants to AmerAlia that:

                                                                          Page 2
<PAGE>   3

         (a)  The Trust is an 'accredited investor' as that term is defined
              in Section 2(a)(15) of the Securities Act of 1933 (the "1933 Act")
              and Rule 215 thereunder, and in Rule 501(a) of Regulation D of the
              1933 Act.

         (b)  AmerAlia has given the Trust and its legal, financial, tax, and
              investment advisors the opportunity to ask questions of and to
              receive answers from persons acting on AmerAlia's behalf
              concerning the terms and conditions of this transaction and the
              opportunity to obtain any additional information regarding
              AmerAlia, its business and financial condition which AmerAlia
              possesses or can acquire without unreasonable effort or expense
              including (without limitation) all minutes of the meetings of the
              Board of Directors of AmerAlia or committees thereof, and other
              relevant documents requested by the Trust. In addition, the Trust
              has spoken with the independent auditors for AmerAlia and has made
              financial or other inquiries as the Trust or its advisors have
              deemed necessary or appropriate in the conduct of the Trust's due
              diligence investigation.

         (c)  The Trust acknowledges and understands that, although there is
              currently a market for AmerAlia's common stock, the market is
              dependent on a number of factors beyond the control of AmerAlia
              and may not continue. Furthermore the Trust acknowledges that
              although AmerAlia believes that it is in compliance with all
              requirements for continued listing of the Common Stock on the
              Nasdaq SmallCap Market, continued listing on the Nasdaq SmallCap
              Market is subject to a number of objective and subjective
              criteria. Although AmerAlia believes it is in material compliance
              with all objective criteria, there can be no assurance that the
              staff of the Nasdaq SmallCap Market may not reach a different
              conclusion or that the Nasdaq staff may not reach a conclusion
              that AmerAlia is, for some reason, not in compliance with
              subjective criteria which is not specified in the rules applicable
              to the Nasdaq SmallCap Market.

         (d)  The Trust understands that the securities being acquired hereby
              are and will continue to be restricted securities within the
              meaning of Rule 144, and applicable state statutes. The Trust
              consents to the placement of an appropriate restrictive legend or
              legends on any certificates evidencing the securities and any
              certificates issued in replacement or exchange therefor and
              acknowledges that AmerAlia will cause its stock transfer records
              to note the restrictions.

              o     The Trust must bear the economic risks of the investment in
                    the securities for an indefinite period of time because they
                    have not been registered under the 1933 Act or any state
                    securities laws;

              o     As "restricted securities" (unless registered for resale or
                    another exemption from registration is available for any
                    transfer), the securities must be held for a minimum of one
                    year following the purchase. Thereafter, the securities may
                    be sold in only limited amounts in a specified manner in
                    accordance with the terms and conditions of Rule 144 (the
                    "Rule") if the Rule is applicable (there being no
                    representation by AmerAlia that it will be applicable). In
                    case the Rule is not applicable, any sales may be made only
                    pursuant to an effective registration statement or an
                    available exemption from registration.

                                                                          Page 3
<PAGE>   4

              o     The securities cannot be sold unless they are registered
                    under the 1933 Act and any applicable state securities laws
                    or unless an exemption from the registration requirements is
                    available. To the extent that AmerAlia files any
                    registration statement under the 1933 Act (not including a
                    registration statement on Form S-4, S-8, S-11, or other
                    inappropriate form), AmerAlia will endeavor to include the
                    Securities in such registration statement, subject to any
                    requirements that may be imposed by any underwriter named in
                    the registration statement (which requirements may include,
                    but are not limited to, a delay in the ability of the
                    selling security holder to sell the shares, a requirement
                    that any sales be made through the underwriter, or a
                    prohibition on any sales by the selling security holder
                    pursuant to the registration statement in certain specified
                    circumstances, in the underwriter's sole discretion).

         (e)  The Trust has reviewed the terms of this agreement and the
              transaction contemplated by this agreement with its legal,
              investment, tax, and financial advisors to the extent the Trust
              has deemed such consultation appropriate. The Trust has also
              consulted with such advisors with regard to the advisability of
              this investment to the extent the Trust has deemed such
              consultation to be appropriate. The Trust acknowledges that
              AmerAlia has advised the Trust that it recommends that the Trust
              obtain advice and consultation. The Trust further acknowledges
              that it has neither sought nor received any advice from AmerAlia
              or any of its agents or affiliates with respect to any aspect of
              this Agreement.

         (f)  The Trust acknowledges that the investment contemplated herein
              is one of significant risk, and there can be no assurance that the
              securities will ever be valuable. The Trust hereby represents that
              the investment in the securities is a suitable investment for it,
              taking into consideration the restrictions on transferability and
              the other considerations affecting the securities and AmerAlia as
              described herein and in AmerAlia's reports filed with the
              Securities and Exchange Commission pursuant to the Securities
              Exchange Act of 1934, as amended (the "1934 Act").

         (g)  The Trust acknowledges that the acquisition of the securities
              as contemplated herein will impose certain reporting obligations
              on the Trust pursuant to Sections 13(d) and 16(a) of the 1934 Act,
              and may impose certain obligations under the Internal Revenue Code
              of 1986, as amended. The Trust will make all necessary filings.

8.       All notices under this Agreement are to be delivered by (i) depositing
         the notice in the mail, using registered mail, return receipt
         requested, addressed to the address below or to any other address as
         the party may designate by providing notice, (ii) telecopying the
         notice by using the telephone number set forth below or any other
         telephone number as the party may designate by providing notice, (iii)
         overnight delivery service addressed to the address below or to any
         other address as the party may designate by providing notice, or (iv)
         hand delivery to the individual designated below or to any other
         individual as the party may designate by providing notice. The notice
         shall be deemed delivered (i) if by registered mail, four (4) days
         after the notice is deposited in the mail, (ii) if by telecopy, on the
         date the notice is delivered, (iii) if by overnight delivery service,
         on the date of delivery, and (iv) if by hand delivery, on the date of
         delivery.

                                                                          Page 4
<PAGE>   5

              If to AmerAlia, to the address set forth in the first paragraph
              hereof, with a copy (which does not constitute notice) to:

                           AmerAlia, Inc.
                           818 Taughenbaugh Blvd
                           Rifle, CO 81650
                           Attn: Bill H. Gunn, President
                           Telecopy: 970-625-9134

              and to:

                           Norton A Lidstone, P.C.
                           Suite 850, The Quadrant
                           5445 DTC Parkway
                           Englewood, CO 80111
                           Attn: Herrick K. Lidstone, Jr., Esq.
                           Telecopy: 303-221-5553

              If to the Trust, to the attention of Vito Spitaleri (telecopy
              number) 410-827-4261) at the address set forth in the first
              paragraph hereof, with a copy (which does not constitute notice)
              to:

                           Hills & Stern
                           1200 Nineteenth Street, N.W.
                           Washington, D.C. 20036
                           Attn: Roderick M. Hills, Esq.
                           Telecopy: 202-822-1622

9.       General Provisions

         (a)  Complete Agreement. The parties agree that this Agreement is the
              complete and exclusive statement of the agreement between the
              parties, which supersedes and merges all prior proposals,
              understandings and all other agreements, oral or written, between
              the parties relating to this Agreement.

         (b)  Amendment. This Agreement may not be modified, altered or amended
              except by written instrument duly executed by both parties.

         (c)  Waiver. The waiver or failure of either party to exercise in any
              respect any right provided for in this Agreement shall not be
              deemed a waiver of any further right under this Agreement.

         (d)  Severability. If any provision of this Agreement is invalid,
              illegal or unenforceable under any applicable statute or rule of
              law, it is to that extent deemed omitted. The remainder of the
              Agreement shall be valid and enforceable to the maximum extent
              possible.

                                                                          Page 5
<PAGE>   6

         (e)  Governing Law. This Agreement and performance hereunder shall be
              governed by the laws of the State of Colorado.

Each party acknowledges that it has read and understands this Agreement and
agrees to be bound by its terms.

AmerAlia, Inc.                              The Jacqueline Badger Mars Trust

By:                                         By:
   ---------------------------                 ---------------------------
Bill H. Gunn, President                     Jacqueline Mars, Trustee

                                                                          Page 6<PAGE>   1
                                                                   Exhibit 10.41

                 EIGHTH AMENDMENT TO REVOLVING CREDIT AGREEMENT

         This Eighth Amendment to Revolving Credit Agreement ("Eighth
Amendment") is made as of June 30, 2000 by and among PROVANT, Inc. (the
"Borrower"), a Delaware business corporation having its principal place of
business at 67 Batterymarch Street, Suite 500, Boston, Massachusetts 02110,
Fleet National Bank, a national banking association ("Fleet"), Wells Fargo Bank
Iowa, N.A., a national banking association ("Wells Fargo"), Citizens Bank of
Massachusetts, a Massachusetts banking corporation ("Citizens"), and KeyBank
National Association, a national banking association ("KeyBank" and, together
with Fleet, Wells Fargo and Citizens, the "Banks"), and Fleet National Bank, as
agent for itself and the other Banks (the "Agent").

                                    RECITALS

         WHEREAS, the Borrower, the Banks and the Agent previously entered into
that certain Revolving Credit Agreement, dated as of April 8, 1998, as modified
and amended by the First, Second, Third, Fourth, Fifth, Sixth and Seventh
Amendments thereto (said Revolving Credit Agreement, as so amended prior to the
date hereof, the "Credit Agreement"), pursuant to which the Banks have made
available to the Borrower a revolving credit loan facility having a maximum
available borrowing amount of $105,000,000; and

         WHEREAS, the parties hereto now desire to further amend or modify the
Credit Agreement in certain respects in order to (i) waive and/or modify and
amend certain of the financial covenants set forth in the Credit Agreement, (ii)
modify the interest rate structure applicable to all loans thereunder, and (iii)
modify the procedures for approval by the Banks of future acquisitions by the
Borrower or its Subsidiaries.

         NOW, THEREFORE, in consideration of the foregoing and other good and
valuable consideration, the receipt of which is hereby acknowledged, the parties
hereto hereby agree to modify and amend certain provisions of the Credit
Agreement, as follows:

         Section 1. Definitions. All capitalized terms used herein without
definition shall have the respective meanings provided therefor in the Credit
Agreement.

         Section 2. Waiver Regarding Specific Provisions. The Banks hereby grant
a waiver of the Consolidated EBITDA financial covenant set forth in Section 9.4
of the Credit Agreement with respect to the four consecutive fiscal quarters of
the Borrower ended on March 31, 2000. The foregoing waiver is limited to the
particular fiscal period set forth in the preceding sentence.

         Section 3. Amendment of Specific Provisions. The following specific
provisions in the Credit Agreement are hereby modified and amended:
<PAGE>   2
                  (a) In the definition of "Applicable Margin" in Section 1.1,
the Table of Interest Rates and Fees is hereby deleted, and the following Table
is substituted therefor:

<TABLE>
<CAPTION>

                                            INTEREST RATES                          FEES
                                        ---------------------------        ------------------------------
                                         PRIME RATE      EURODOLLAR        COMMITMENT    LETTER OF CREDIT
     LEVERAGE RATIO                        LOANS         RATE LOANS        FEE RATE         FEE RATE
     --------------                   --------------    -----------        --------      ----------------
<S>                                     <C>             <C>                <C>           <C>
<  1.00 X                                     0.00%        0.875%            0.25%           0.875%

> or = to 1.00 X < 1.50 X                     0.00%         1.25%            0.30%            1.25%

> or = to 1.50 X < 2.00 X                     0.25%        1.625%            0.35%           1.625%

> or = to 2.00 X < 2.50 X                     0.50%        1.875%            0.40%           1.875%

> or = to 2.50 X                              0.75%         2.25%            0.45%            2.25%
</TABLE>

         Also, the reference "> or = to 3.00" appearing in the final sentence
of the definition of "Applicable Margin" is hereby amended to read "> or = to
2.50".

                  (b) For purposes of the applicability of the minimum
Consolidated EBITDA covenant set forth in Section 9.4 of the Credit Agreement
(and not for purposes of any other financial covenant), (i) the required minimum
amount of Consolidated EBITDA for the four consecutive fiscal quarters of the
Borrower to end on June 30, 2000 shall be $30,000,000 (but for each subsequent
four-quarter fiscal period the minimum Consolidated EBITDA amount shall be as
specified in said Section 9.4), and (ii) the calculation of minimum Consolidated
EBITDA pursuant to said Section 9.4 shall be deemed to include addbacks to
Consolidated Net Income for (x) a restructuring charge of $10.6 million taken by
the Borrower in its third fiscal quarter ended March 31, 2000 and described in
its quarterly financial statements, which restructuring charge relates to the
Borrower's reorganization program consisting of executive/employee severance,
lease termination costs, inventory and contract termination costs, the
abandonment of property and equipment, and other costs relating to eliminated
activities, and (y) a further restructuring charge of up to $1.1 million for the
Borrower's reorganization program taken in the Borrower's fourth fiscal quarter
ending June 30, 2000.

                  (c) In Section 9.6 of the Credit Agreement, the text thereof
shall be amended and restated in its entirety to read as follows (and shall
apply to the fiscal year of the Borrower ending on June 30, 2000 and to each
fiscal year thereafter):

                  "9.6 Capital Expenditures. The Borrower and its Subsidiaries
         will not make in the aggregate Capital Expenditures in excess of Ten
         Million Dollars ($10,000,000) in any single fiscal year of the
         Borrower. In calculating the amount of Capital Expenditures incurred,
         no unutilized amount of Capital Expenditures permitted to be incurred
         in any given fiscal year may be used or credited by the Borrower or its
         Subsidiaries in any subsequent fiscal year by the Borrower."

                                      -2-
<PAGE>   3
                  (d) In Section 8.5.1 of the Credit Agreement, the text of such
subparagraph shall be amended and restated in its entirety to read as follows:

                  "8.5.1 Mergers and Acquisitions. The Borrower will not, and
         will not permit its Subsidiaries to, become a party to any merger or
         consolidation, or agree to or effect any asset acquisition or stock
         acquisition (other than the acquisition of assets in the ordinary
         course of business consistent with past practices), except for (i) the
         mergers contemplated by the Transaction, (ii) the merger or
         consolidation of any one or more wholly-owned Subsidiaries of the
         Borrower with and into the Borrower, or the merger or consolidation of
         two or more wholly-owned Subsidiaries of the Borrower (so long as the
         successor Subsidiary is, or contemporaneously becomes, a Guarantor
         under the Guaranty and the stock of such successor Subsidiary is, or
         contemporaneously becomes, pledged and assigned under the Pledge
         Agreement), and (iii) the acquisition of the assets or stock of another
         party not already a Subsidiary (each, a "Permitted Acquisition"), but
         only if and to the extent that such Permitted Acquisition is approved
         in writing by the Majority Banks in their discretion (including, if so
         approved, any conditions which such Majority Banks may determine
         necessary or appropriate to impose)."

         Section 4. Confirmation of Stock Pledge Agreement. The parties hereto
agree that all references to the "Credit Agreement" contained in the Stock
Pledge Agreement and all Supplements thereto shall mean or refer to the Credit
Agreement as amended and supplemented by this Eighth Amendment and as it may be
further amended, supplemented, modified and restated and in effect from time to
time, including without limitation any such amendment, supplement, modification
or restatement which increases the amount of Indebtedness owing by the Borrower
thereunder.

         Section 5. Loan Documents Ratified and Confirmed. The Credit Agreement,
the Notes and each of the other Loan Documents, as specifically supplemented or
amended by this Eighth Amendment and the other documents executed in connection
herewith, are and shall continue to be in full force and effect and are hereby
in all respects ratified and confirmed. Without limiting the generality of the
foregoing, the Security Documents and all of the collateral described therein
do, and shall continue to, secure the payment of all obligations under the Loan
Documents, in each case as amended or supplemented pursuant to this Eighth
Amendment. The waiver set forth in Section 2 of this Eighth Amendment is limited
to the specific matter and circumstances described herein, and no further or
additional waiver as to any other obligations under the Credit Agreement is
granted hereby.

         Section 6. Conditions to Effectiveness. This Eighth Amendment shall
become effective only upon (i) completion of the execution and delivery to the
Agent of an Amendment and Confirmation of Guaranty, dated the date hereof and
substantially in the form attached hereto as Exhibit A, by each of the
Borrower's Subsidiaries which is a Guarantor, and (ii) payment of the Closing
Fees specified in Section 8 below.

                                      -3-
<PAGE>   4
         Section 7. Bringdown. The Borrower hereby confirms that all
representations and warranties with respect to the Borrower and any Subsidiaries
contained in the Credit Agreement and each of the other Loan Documents and in
any other certificate or document delivered in connection therewith are true and
correct as of the date hereof, and that no Default or Event of Default is
outstanding or would be created by the consummation of the transactions
described herein.

         Section 8. Fees, Costs and Expenses.

                  (a) In connection with the execution of this Eighth Amendment,
the Borrower shall pay a Closing Fee to each Bank in an amount equal to (i) such
Bank's respective Commitment times (ii) .125%.

                  (b) In addition to the foregoing Closing Fees, the Borrower
agrees to pay on demand all reasonable costs and expenses of the Agent and the
Banks, including without limitation all reasonable fees and expenses of counsel,
in connection with the preparation, execution and delivery of this Eighth
Amendment and the other documents and instruments to be delivered herewith.

         Section 9. Miscellaneous. This Eighth Amendment may be executed in
several counterparts and by each party on a separate counterpart, each of which
when executed and delivered shall be an original, and all of which together
shall constitute one instrument. In proving this Eighth Amendment, it shall not
be necessary to produce or account for more than one such counterpart signed by
the party against whom enforcement is sought. This Eighth Amendment is intended
to take effect as a sealed instrument and shall for all purposes be construed in
accordance with and governed by the laws of The Commonwealth of Massachusetts,
(excluding the laws applicable to conflicts or choice of law).

                                     ******

                                      -4-
<PAGE>   5
         IN WITNESS WHEREOF, the parties hereto have caused this Eighth
Amendment to be duly executed as an instrument under seal as of the date first
above written.

                                           PROVANT, INC.

                                           By: /s/ Rajiv Bhatt
                                               --------------------------------
                                               Title: Executive Vice President

                                           CITIZENS BANK OF MASSACHUSETTS

                                           By: /s/ Michael S. St. Jean
                                               --------------------------------
                                               Title:  Vice President

                                           FLEET NATIONAL BANK

                                           By: /s/ Michael J. Bassick
                                               --------------------------------
                                               Title:  Vice President

                                           KEYBANK NATIONAL ASSOCIATION

                                           By: /s/ Lisa L. Turilli
                                               --------------------------------
                                               Title: Vice President

                                           WELLS FARGO BANK IOWA, N.A.

                                           By: /s/ Robert S. Gagne
                                               --------------------------------
                                               Title: Vice President

                                           FLEET NATIONAL BANK, as AGENT

                                           By: /s/ Michael J. Bassick
                                               --------------------------------
                                               Title: Vice President

                                      -5-
<PAGE>   6
                                    EXHIBIT A

                     AMENDMENT AND CONFIRMATION OF GUARANTY

         This AMENDMENT AND CONFIRMATION OF GUARANTY (the "Guaranty Amendment"),
dated as of June 30, 2000, is entered into by each of the parties identified as
a Guarantor on the signature page hereto, all of which are "Guarantors" under
that certain Guaranty, dated as of May 29, 1998, as supplemented by various
Instruments of Adherence thereto and prior Amendment and Confirmation of
Guaranty instruments dated as of December 31, 1998, March 31, 1999, June 29,
1999, September 30, 1999 and December 10, 1999, respectively (as so described,
the "Guaranty"), made by such Guarantors in favor of Fleet National Bank, as
Agent. All capitalized terms used herein without definition shall have the
respective meanings set forth in the Credit Agreement (as hereinbelow defined).

         WHEREAS, the Agent is a party to that certain Revolving Credit
Agreement, dated as of April 8, 1998 (as thereafter supplemented or amended
prior to the date hereof, the "Credit Agreement") among PROVANT, Inc. (the
"Borrower"), the Agent and the Banks named therein; and

         WHEREAS, the Borrower and the Guarantors are members of a group of
related corporations, and each of the Guarantors has previously entered into the
Guaranty for the purpose of assuring payment of all Obligations (as defined in
the Credit Agreement) of the Borrower; and

         WHEREAS, the Banks, the Agent and the Borrower this day intend to enter
into a Eighth Amendment to Revolving Credit Agreement (the "Eighth Amendment"),
which, inter alia, provides for certain amendments, modifications or waivers of
the Banks with respect to the provisions of the Credit Agreement; and it is a
condition precedent to the Banks' willingness to enter into the Eighth Amendment
and to continue to make Revolving Credit Loans or extend credit under the Credit
Agreement that each of the Guarantors execute and deliver this Guaranty
Amendment.

         NOW, THEREFORE, in consideration of the foregoing and other good and
valuable consideration, the receipt of which is hereby acknowledged, the parties
hereto agree as follows:

         1. All references to the "Credit Agreement" appearing in the Guaranty
(including references to capitalized terms which are defined in the Credit
Agreement) shall mean and refer to the Credit Agreement as it is amended and
supplemented by the Eighth Amendment and as it may be further amended,
supplemented, modified or restated and in effect from time to time hereafter,
and including without limitation any such amendment, supplement, modification or
restatement which increases the amount of Indebtedness owing by the Borrower
thereunder.

         2. The Guarantors hereby ratify and confirm the Guaranty, as
supplemented or modified by this Guaranty Amendment, as remaining in full force
and effect.
<PAGE>   7
         3. This Guaranty Amendment shall be governed by and construed in
accordance with the laws of The Commonwealth of Massachusetts (excluding the
laws applicable to conflicts or choice of law).

         IN WITNESS WHEREOF, each of the Guarantors has caused this Guaranty
Amendment to be executed and delivered as an instrument under seal as of the
date first above written.

                  [Remainder of page intentionally left blank.]

                                      -2-
<PAGE>   8
                                               GUARANTORS:

                                               BT. NOVATIONS, INC.

                                               By:______________________________
                                                   Title:

                                               DECKER COMMUNICATIONS, INC.

                                               By:______________________________
                                                   Title:

                                               J. HOWARD & ASSOCIATES, INC.

                                               By:______________________________
                                                   Title:

                                               NOVATIONS GROUP, INC.

                                               By:______________________________
                                                   Title:

                                               AMERICAN MEDIA INCORPORATED

                                               By:______________________________
                                                   Title:

                                               STRATEGIC INTERACTIVE, INC.

                                               By:______________________________
                                                   Title:

                                               MOHR LEARNING, INC.

                                               By:______________________________
                                                   Title:

                                      -3-
<PAGE>   9
                                               STAR MOUNTAIN, INC.

                                               By:______________________________
                                                   Title:

                                               KC-EP, INC.

                                               By:______________________________
                                                   Title:

                                               PROVANT UTAH, INC.

                                               By:______________________________
                                                   Title:

                                               STAR MEDIA, INC.

                                               By:______________________________
                                                   Title:

                                               STAR DIGITAL, INC.

                                               By:______________________________
                                                   Title:

                                               PROVANT SERVICES, INC.

                                               By:______________________________
                                                   Title

                                               SENN-DELANEY LEADERSHIP
                                               CONSULTING GROUP, INC.

                                               By:______________________________
                                                   Title

                                      -4-
<PAGE>   10
                                               PMSI-PROJECT MENTORS, INC.

                                               By:______________________________
                                                   Title

                                               SALES PERFORMANCE
                                               INTERNATIONAL, INC.

                                               By:______________________________
                                                   Title:

                                               SOLUTION SELLING, INC.

                                               By:______________________________
                                                   Title:

                                               FPMI COMMUNICATIONS, INC.

                                               By:______________________________
                                                   Title:

Accepted:

FLEET NATIONAL BANK, As Agent

By:______________________________
     Title:

                                      -5-

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00015-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00015-of-00352.parquet"}]]