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Exhibit 10.25    
  

  

 
 

BUSINESS LOAN AGREEMENT    
  

        This Business Loan Agreement (this "Agreement") is entered into by and between Comerica Bank-California ("Bank") and Quidel
Corporation, a Delaware Corporation ("Borrower") as of this 29th  day of August, 2002, at Bank's headquarters office at
333 West Santa Clara Street, San Jose, California 95113. 

        1.    Loans To Borrower.    Bank and Borrower agree that any loans which Bank in its sole discretion has made or may
now or hereafter make to Borrower (sometimes hereinafter collectively referred to as the "Loan") shall be subject to the terms and conditions of this Agreement unless otherwise agreed to in writing by
Bank and Borrower. In the event there are contradictions between the provisions of this Agreement and any other written agreement with the Bank, this Agreement shall prevail. Loan shall be subject to
the terms and conditions of this Agreement, promissory note(s) executed in connection herewith and/or previously or subsequently executed, and all amendments, renewals and extensions thereof
(singularly or collectively, the "Note"), and all those certain security agreements and/or such other security or other documents as Bank has required or may now or hereafter require in connection
with the Loan (collectively, the "Loan Documents"). 

        2.    Legal Effect.    This Agreement supplements the terms and conditions of the Loan Documents. Except as otherwise
specified herein, all terms used in this Agreement shall have the same meaning as given in the Note and/or Loan Documents which are incorporated herein by this reference. Any and all terms used in
this Agreement, the Note and/or the Loan Documents shall be construed and defined in accordance with the meaning and definition of such term under and pursuant to the California
Uniform Commercial Code, as amended. Except as specifically modified hereby, all of the terms and conditions of the Note and/or the Loan Documents shall remain in full force and effect. 

        3.    Interest Rate; Payment Terms; Loan Fees.    The principal and interest on the Loan shall be payable on the terms
set forth in the Note and/or the Loan Documents. If applicable, a loan fee shall be paid concurrently with the execution of this Agreement. In addition, Borrower shall pay such additional loan fees
from time to time in the future as agreed between Bank and Borrower. 

        4.    Security.    As security for Borrower's obligations to Bank under this Agreement, the Note and/or the Loan
Documents and all other indebtedness and liabilities whatsoever of Borrower to Bank, whether direct or indirect, absolute or contingent, due or to become due, now existing or hereafter arising,
evidenced by the Note and/or the Loan Documents (collectively, the "Indebtedness"), Borrower hereby grants to Bank, prior to or simultaneously with the borrowing hereunder, a continuing security
interest of first priority, subject to all Permitted Liens, in all accounts receivable, inventory, equipment and intangibles and all proceeds thereof, and in all collateral provided to Bank pursuant
to any security agreement and/or all collateral that is delivered to Bank and/or which Bank possesses and all proceeds thereof, (collectively, the "Collateral"). As used herein, "Permitted Liens"
shall include all of the following: (i) liens securing the Indebtedness; (ii) existing liens; (iii) purchase money security interests in specific items of equipment;
(iv) liens for taxes, assessments or charges of any governmental authority for claims not yet due and payable or being contested in good faith by appropriate proceedings and reserved on
Borrower's books to the extent required by generally accepted accounting practice and deemed adequate by Borrower; (v) additional security interests consented to by Bank; (vi) statutory
liens of landlords and liens of carriers, warehousemen, consignees, buyers, mechanics, materialmen, bankers and other liens imposed by law and created in the ordinary course of business for amounts
not yet due and payable or being contested in good faith; (vii) liens incurred and deposits made in the ordinary course of business in connection with workers' compensation, unemployment 

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insurance and other types of social security benefits or to secure the performance (including by way of surety bonds or appeal bonds) of tenders, bids, leases, contracts, statutory obligations or
similar obligations or arising as a result of progress payments under contracts, in each case in the ordinary course of business and not relating to the repayment of debt; (viii) any attachment
or judgment lien in existence less than 10 days after the entry thereof or with respect to which (a) execution has been stayed, or (b) payment is covered in full by insurance,  provided
that such acquisition does not create an Event of Default; (ix) liens existing on assets of any entity at the time such entity becomes a
subsidiary of Borrower, provided (a) such lien was not created in contemplation of such person becoming a subsidiary, and (b) such lien
does not encumber any assets other than the assets subject to such lien at the time such entity becomes a subsidiary; (x) any lien constituting a renewal, extension or replacement of any
Permitted Lien, (xi) other liens incidental to the conduct of the business or the ownership of the assets of the Borrower or any subsidiary that (a) were not incurred in connection with
borrowed money, (b) do not in the aggregate materially detract from the value of the assets subject thereto or materially impair the use thereof in the operation of such business and
(c) do not secure obligations aggregating in excess of One Million Dollars ($1,000,000). 

        5.    Representations and Warranties of Borrower.    Borrower represents and warrants to Bank that as of the date of
acceptance of this Agreement, the Note and/or the Loan Documents, as of the date of borrowing hereunder and at all times the Loan or any other Indebtedness are outstanding hereunder: 

        (a)  If
Borrower is a corporation, Borrower is duly organized, validly existing and in good standing under the laws of the state of its incorporation; if a partnership,
Borrower is duly organized and validly existing under the partnership agreement and the applicable laws of the state in which the partnership is formed or exists or if a limited liability company,
Borrower is duly organized and validly existing under the operating agreement and the applicable laws of the state in which the limited liability company is formed; 

        (b)  Borrower
has the legal power and authority, to own its properties and assets and to carry out its business as now being conducted; it is qualified to do business in
every jurisdiction wherein such qualification is necessary, except where the failure to be so qualified would not have a material adverse effect on Borrower; it has the legal power and authority to
execute and perform this Agreement, the Note and/or the Loan Documents to borrow money in accordance with its terms, to execute and deliver this Agreement, the Note and the Loan Documents, and to do
any and all other things required of it hereunder; and this Agreement, the Note and all the Loan Documents, when executed on behalf of Borrower by its duly authorized officers, partners or members, as
the case may be, shall be its valid and binding obligations legally enforceable in accordance with their terms, except as such enforceability may be limited by general principles of equity and
bankruptcy, insolvency, reorganization and moratorium and other similar laws relating to creditors' rights; 

        (c)  The
execution, delivery and performance of this Agreement, the Note and/or the Loan Documents and the borrowings hereunder and thereunder (i) have been duly
authorized by all requisite corporate, partnership or company action; (ii) do not require governmental approval; (iii) will not result (with or without notice and/or the passage of time)
in any conflict with or breach or violation of or default under, any provision of law, the articles of incorporation, articles of organization, operating agreement, bylaws or partnership agreement of
Borrower, any provision of any indenture, agreement or other instrument to which Borrower is a party, or by which it or any of its properties or assets are bound; and (iv) will not result in
the creation or imposition of any lien, charge or encumbrance of any nature whatsoever upon any of the properties or assets of Borrower; 

        (d)  The
balance sheet of Borrower as provided to Bank in connection herewith and the related statement of income of Borrower provided to Bank for the period ended  March 31, 2002, 

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fairly present the financial condition of Borrower in accordance with generally accepted accounting principles ("GAAP") consistently applied; and from the date thereof to the date hereof, there has
been no material adverse change in such condition or operations; and 

        (e)  There
is not pending nor, to the best of Borrower's knowledge, threatened, any litigation, proceeding or governmental investigation which could materially and adversely
affect its business or its
ability to perform its obligations, pay the Indebtedness and/or comply with the covenants set forth herein and/or in the Note and/or the other Loan Documents. 

        6.    Affirmative Covenants.    Until the Indebtedness is paid in full, Borrower covenants and agrees to do the
following: 

        (a)  Furnish
to Bank within forty-five (45) days after the end of each quarter, an unaudited balance sheet
and statement of income and 10Q report covering Borrower's operations. Within ninety (90) days of the end of each of Borrower's fiscal years, furnish to Bank statements of the financial
condition of Borrower for each such fiscal year, including but not limited to, a balance sheet, profit and loss statement, statement of cash flow and 10K report. Said annual statements shall be
prepared by an independent certified public accountant selected by Borrower and reasonably acceptable to Bank on an audited basis; 

        (b)  In
addition to the financial statements requested above, Borrower agrees to provide Bank with the following schedules in a form acceptable to
Bank:

	 	 	  X  	 	Accounts Receivable Aging Reports	 	on an as requested basis
	 	 	  X  	 	Accounts Payable Aging Reports	 	on an as requested basis
	 	 	 N/A 	 	Job Progress Reports	 	on a                          basis; and
	 	 	  X  	 	Inventory Reports	 	on an as requested basis
	 	 	 N/A 	 	 	 	on a                        basis

        (c)  Promptly
inform Bank of the occurrence of any default or event of default as defined in the Note and/or the Loan Documents (hereinafter referred to as "Default") or of
any event which could have a materially adverse effect upon Borrower's business, properties, financial condition or ability to comply with its obligations hereunder, including without limitation its
ability to pay the Indebtedness; 

        (d)  Furnish
such other information as Bank may reasonably request; 

        (e)  Keep
in full force and effect its own corporate, company or partnership existence in good standing; continue to conduct and operate its business substantially as
presently conducted and operated and maintain and protect all material franchises and trade names and preserve all the remainder of its property used or useful in the conduct of its business and keep
the same in good repair and condition, ordinary wear and tear excepted; 

        (f)    Comply
with the financial covenants set forth in Addendum A, attached hereto and made a part hereof; 

        (g)  Maintain
a standard and modern system of accounting in accordance with GAAP consistently applied with ledger and account cards and/or computer tapes and computer disks,
computer printouts and computer records pertaining to the Collateral which contain information as may from time to time be requested by Bank, not modify or change its method of accounting, in any
material respect, without the written consent of Bank first obtained such consent not to be unreasonably withheld, conditioned or delayed, provided, however, that if any changes in generally accepted
accounting principles from those used in the preparation of the financial statements referred to in this Agreement hereafter result from the promulgation of rules, regulations, pronouncements, or
opinions of or are otherwise required by the Financial Accounting Standards 

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Board or the American Institute of Certified Public Accountants (or successors thereto or agencies with similar functions), or there shall occur any change in the Borrower's fiscal or tax years and,
as a result of any such changes, there shall result a change in the method of calculating any of the financial covenants, negative covenants, standards or other terms or conditions found in this
Agreement, then the parties hereto agree to enter into negotiations in order to amend such provisions so as to equitably reflect such changes with the desired result that the criteria for evaluating
the Borrower's financial condition shall be the same after such changes as if such changes had not been made, 

        (h)  Permit
Bank and any of its employees, officers, or agents, upon reasonable prior notice, during Borrower's usual business hours, or the usual business hours of any third
person having control thereof, to have access to and examine all of Borrower's records relating to the Collateral, Borrower's financial condition and the results of Borrower's operations and in
connection therewith, permit Bank or any of its agents, employees, or officer to copy and make extracts therefrom; 

        (i)    Maintain
Borrower's same place of business or chief executive office or residence as indicated below, and not relocate said address without giving Bank 30 days
prior written notice; 

        (j)    Maintain
insurance with such insurers in such amounts and of a type reasonably satisfactory to Bank, with Bank to be designated as the payee of any such insurance
policies under a payee/secured lender clause reasonably acceptable to Bank; and 

        (k)  On
a continuing basis from the date of this Agreement until the Indebtedness is paid in full and Borrower has performed all of its other obligations hereunder, Borrower
represents and agrees that: 

        (1)  There
are not and will not be Hazardous Materials (as later defined) on, in or under any real or personal property ("Property") now or at any time owned, occupied or
operated by Borrower which in any material manner violate any Environmental Law (as later defined). 

        (2)  Borrower
shall promptly conduct all investigations, testing and other actions necessary to clean up and remove all Hazardous Materials on or affecting the Property in
accordance with every Environmental Law. 

        (3)  Borrower
shall defend, indemnify and hold harmless Bank, its employees, agents, officers, shareholders and directors from and against any and all claims, damages, fines,
expenses, liabilities or causes of action of whatever kind, including without limit consultant fees, legal expenses and reasonable attorneys' fees, suffered by any of them as a direct or indirect
result of any actual or asserted violation of any Environmental Law. 

        (4)  Upon
ten days notice to Borrower (except in an emergency), Bank may (but is not obligated to) enter on the Property or take such other actions as it deems appropriate to
inspect, test for, clean up, remove or minimize the impact of any Hazardous Materials upon Bank's receipt of any notice from any source asserting the existence of any Hazardous Materials in violation
of any Environmental Law. All costs and expenses so incurred by Bank, including without limit consultant fees, legal expenses and reasonable attorneys' fees, shall be payable by Borrower upon demand. 

        (5)  The
provisions of this section shall survive the repayment of the Indebtedness, the satisfaction of all other obligations of Borrower to Bank, the discharge or
termination by Bank of any lien or security interest from Borrower, and the foreclosure of or exercise of rights as to any collateral given to Bank. 

        (6)  "Hazardous
Materials" mean all of the following: any asbestos, petroleum, petroleum by-products, flammable explosives, or radioactive materials or any
hazardous or toxic materials 

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as defined in the Comprehensive Environmental Response, Compensation and Liability Act of 1980, as amended (42 U.S.C. Sections 9601 et seq.) or in any other Environmental Law. 

        (7)  "Environmental
Law" means any federal, state, local or other law, ordinance, statute, directive, rule, order or regulation on object of which is to regulate or improve
health, safety or the environment. 

        7.    Negative Covenants.    Borrower shall not, without Bank's prior written consent, such consent not to be
unreasonably withheld, conditioned or delayed, do any of the following: 

        (a)  Grant
a security interest in or permit a lien, claim or encumbrance upon any of the Collateral to any person, association, firm, corporation, entity, governmental agency
or instrumentality, except for Permitted Liens; 

        (b)  Create,
incur, assume or suffer to exist any mortgage, pledge, encumbrance, security interest, lien or charge upon, or create, suffer or permit to exist any lien,
security interest in, or encumbrance upon any of its property or assets, whether now owned or hereafter acquired, except for Permitted Liens. In addition, Borrower shall not enter into an agreement
with a third party providing financing to Borrower by which Borrower places an additional negative pledge on its assets or promises not to hypothecate or transfer said assets. Borrower acknowledges
and agrees that assets shall include, without limitation, Intellectual Property. 

        (c)  Permit
any levy, attachment or restraint to be made affecting any of Borrower's assets in an amount in excess of One Million Dollars ($1,000,000); 

        (d)  Permit
any judicial officer or assignee to be appointed or to take possession of any or all of Borrower's assets in excess of One Million Dollars ($1,000,000); 

        (e)  Other
than sales of inventory in the ordinary course of Borrower's business, to sell, lease or otherwise dispose of, move, or transfer, whether by sale or otherwise, any
of Borrower's assets exceeding, in the aggregate, One Million Dollars ($1,000,000) in value in any one fiscal year; 

        (f)    Change
its name, business structure, corporate identity or structure; add any new fictitious name, liquidate, merge or consolidate with or into any other business
organization where (i) Borrower is not the surviving entity, (ii) the cost to Borrower is in excess of One Million Dollars ($1,000,000), and (iii) such merger or consolidation
otherwise creates an Event of Default; 

        (g)  Move
or relocate any material portion of the collateral except in the ordinary course of Borrower's business; 

        (h)  Acquire
any other business organization that would cause a use of Borrower's cash or the assumption of debt in excess of One Million Dollars ($1,000,000); 

        (i)    Enter
into any transaction not in the usual course of Borrower's business, except for an acquisition or disposition involving the use of Borrower's cash or assumption of
debt of less than One Million Dollars ($1,000,000); 

        (j)    Make
any investment in securities of any person, association, firm, entity or corporation other than marketable direct obligations issued or unconditionally guaranteed
by the United States Government or issued by any agency thereof and backed by the full faith and credit of the United States, in each case maturing within one year from the date of acquisition
thereof, (ii) marketable direct obligations issued by any state of the United States or any political subdivision of any such state or any public instrumentality thereof maturing within one
year from the date of acquisition thereof and having, at the time of acquisition, the highest rating obtainable from either Standard & Poor's Rating Group or Moody's Investors
Service, Inc., (iii) commercial paper having, at the time of acquisition, one of the highest two ratings obtainable from either Standard & Poor's Rating Group or Moody's Investors
Service, Inc., (iv) certificates of deposit, other time deposits, 

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and bankers' acceptances maturing within one year from the date of acquisition thereof issued by any bank operating under the laws of the United States or any state thereof or the District of
Columbia that has combined capital and surplus of not less than $500,000,000, (v) repurchase agreements with respect to any of the Investments permitted under the foregoing clauses (i), (ii),
(iii), and (iv); or (v) institutional money market funds organized under the laws of the United States of America or any state thereof that invest solely in any of the Investments permitted
under the foregoing clauses (i), (ii), (iii), and (iv); (vi) investments by the Borrower or any subsidiary in any of Borrower's subsidiaries and (vii) investments not otherwise
permissible hereunder, provided that the amount of any such otherwise impermissible investment does not exceed One Million Dollars ($1,000,000); 

        (k)  Make
any change in Borrower's financial structure or in any of its business objects, purposes or operations which would adversely affect the ability of Borrower to pay
its obligations; 

        (l)    Incur
any debt, other than obligations to Bank, in excess of One Million Dollars ($1,000,000), outside the ordinary course of Borrower's business; 

        (m)  Make
any advance or loan except in the ordinary course of Borrower's business except for (i) loans or advances that are current assets or arise from sales in the
ordinary course of business; (ii) trade credit extended on usual and customary terms in the ordinary course of business; (iii) advances to employees for moving, relocation and travel
expenses, drawing accounts and similar expenditures in the ordinary course of business; loans or advances for working capital purposes by the Borrower to any subsidiary or joint venture,  provided
(a) such subsidiary or joint venture has positive tangible net worth
after giving effect to such loan or advance, (b) such debt is incurred in the ordinary course of business of such subsidiary or joint venture, (c) such debt is evidenced by a note or
other instrument that is subject to a valid, perfected and first priority lien in favor of the Bank; 

        (n)  Guaranty
or otherwise, directly or indirectly, in any way be or become responsible for obligations of any other person, whether by agreement to purchase the indebtedness
of any other person, agreement for the furnishing of funds to any other person through the furnishing of goods, supplies or services, by way of stock purchase, capital contribution, advance or loan,
for the purpose of paying and discharging (or causing the payment or discharge of) the indebtedness of any other person, or otherwise, except for the endorsement of negotiable instruments by Borrower
in the ordinary course of business for deposit or collection; 

        (o)  Sell,
lease, transfer or otherwise dispose of properties and assets having an aggregate book value of more than One Million Dollars
($1,000,000.00) (whether in one transaction or in a series of transactions) except as to the sale of the inventory in the ordinary course of business;
change its name, consolidate with or merge into any corporation, permit another corporation to merge into it, enter into any reorganization or recapitalization or reclassify its capital stock, or
enter into any sale-lease back transaction; 

        (p)  Purchase
or hold beneficially any stock or other securities of, or make any investment for more than One Million Dollars ($1,000,000) or acquire any interest for more
than One Million Dollars ($1,000,000) in, any other person, except for the common stock of the subsidiaries owned by Borrower on the date of this Agreement or other applicable date and except for
certificates of deposit with maturities of one year or less of a United States commercial bank with capital, surplus and undivided profits in excess of One Hundred Thousand  Dollars ($100,000.00), and direct obligations of the United States government maturing within one (1) year from the date
of acquisition thereof; 

        (q)  Allow
any fact, condition or event to occur or exist with respect to any employee, pension or profit sharing plan established or maintained by it which might constitute
grounds for 

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termination of any such plan or for the court appointment of a trustee to administer any such plan; 

        (r)  Acquire
or expend for or commit itself to acquire or expend for fixed assets by lease, purchase or otherwise in an aggregate amount that exceeds  One Million Dollars ($1,000,000.00) in any fiscal year; or

        8.    Default.    The terms "Default" or "Event of Default", as used herein, shall have the meaning given in the Note
and/or the Loan Documents. In addition, the parties agree that any one or more of the
following events shall constitute a default by Borrower under this Agreement, the Note and/or the Loan Documents: 

        (a)  If
Borrower fails or neglects to perform, keep or observe any material term, provision, condition, covenant, agreement, warranty or representation contained in this
Agreement, the Note, the Loan Documents or any other present or future agreement between Borrower and Bank; 

        (b)  If
any material representation, statement, report or certificate made or delivered by Borrower, or any of its officers, employees or agents to Bank is not true and
correct as of the time such representation, statement, report or certificate was made; 

        (c)  If
Borrower fails to pay when due and payable or declared due and payable, all or any portion of the Indebtedness (whether or principal, interest, taxes, reimbursement
of Bank expenses, or otherwise); 

        (d)  If
there is a material impairment of the value or priority of Bank's security interest in the collateral; 

        (e)  If
all or any of Borrower's assets in excess of One Million Dollars ($1,000,000) are affected, become subject to a writ or distress warrant, or are levied upon, or come
into the possession of any judicial officer or assignee and the same are not released, discharged or bonded against within ten (10) days thereafter; 

        (f)    If
any insolvency proceeding is filed or commenced by or against Borrower without being dismissed within ten (10) days thereafter; 

        (g)  If
any bankruptcy or other proceeding is filed or commenced by or against Borrower for its reorganization, dissolution or liquidation without being dismissed within ten
(10) days of its commencement; 

        (h)  If
Borrower is enjoined, restrained or in any way prevented by court order from continuing to conduct all or any material part of its business affairs; 

        (i)    If
a notice of lien, levy or assessment is filed of record with respect to any or all of Borrower's assets by the United States Government, or any department, agency or
instrumentality thereof, or by any state, county, municipal or other government agency, or if any taxes or debts owing in excess of Two Hundred Thousand Dollars ($200,000) at any time hereafter to any
one or more of such entities
becomes a lien, whether inchoate or otherwise, upon any or all of the Borrower's assets and the same is not paid on the payment date thereof; 

        (j)    If
a judgment or other claim becomes a lien or encumbrance upon any or all of Borrower's assets in excess of One Million Dollars ($1,000,000) and the same is not
satisfied, dismissed or bonded against within ten (10) days thereafter; 

        (k)  If
Borrower's records are prepared and kept by an outside computer service bureau at the time this Agreement, the Note and/or the Loan Documents are entered into or
during the term of this Agreement, the Note and/or the Loan Documents, such an agreement with an outside service bureau is entered into, and at any time thereafter, without first obtaining the written
consent of 

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Bank, Borrower terminates, modifies, amends or changes its contractual relationship with said computer service bureau or said computer service bureau fails to provide Bank with any requested
information or financial data pertaining to Bank's Collateral, Borrower's financial condition or the results of Borrower's operations; 

        (l)    If
Borrower permits a default in any material agreement to which Borrower is a party with third parties so as to result in an acceleration of the maturity of Borrower's
indebtedness to others, whether under any indenture, agreement or otherwise; 

        (m)  If
Borrower makes any payment on account of indebtedness which has been subordinated to Borrower's obligations to Bank, including without limitation the Indebtedness,  provided, however, that as long as no Event of Default then exists, the Borrower and its subsidiaries
may pay intercompany debt in the ordinary course of business consistent with past practice; 

        (n)  If
any material misrepresentation exists now or thereafter in any written warranty or representation made to Bank by any officer or director of Borrower, or if any such
written warranty or representation is withdrawn by any officer or director; 

        (o)  If
any party subordinating its claims to that of Bank's or any guarantor of Borrower's obligations terminates its subordination or guaranty, becomes insolvent or an
insolvency proceeding is commenced by or against any such subordinating party or guarantor; 

        (p)  If
Borrower is an individual and Borrower dies; 

        (q)  If
there is a change of ownership or control of N/A percent (            %) or more of the issued and outstanding stock of Borrower; or 

        (r)  If
any reportable event, which the Bank reasonable determines constitutes grounds for the termination of any deferred compensation plan by the Pension Benefit Guaranty
Corporation or for the appointment by the appropriate United States District Court of a trustee to administer any such plan, shall have occurred and be continuing thirty (30) days after written
notice of such determination shall have been given to Borrower by Bank, or any such Plan shall be terminated within the meaning of Title IV of the Employment Retirement Income Security Act ("ERISA"),
or a trustee shall be appointed by the appropriate United States District Court to administer any such plan, or the Pension Benefit Guaranty Corporation shall institute proceedings to terminate any
plan and in case of any event described in this Section 8, the aggregate amount of the Borrower's liability to the Pension Benefit Guaranty Corporation under Sections 4062, 4063 or 4064 of
ERISA shall exceed five percent (5%) of Borrower's Tangible Effective Net Worth. 

        Bank
shall not be obligated to make advances to Borrower during any cure period provided for in Sections 8(e), 8(f), 8(j), and 8(r) above. 

        9.    Rights and Remedies.    The parties have agreed as follows with respect to Bank's rights and remedies upon
Default: 

        (a)  Bank
shall have all rights and remedies available hereunder and under the Note and the Loan Documents and under applicable law; 

        (b)  Bank
may at its option without notice, accelerate the Indebtedness and declare all Indebtedness to be due, owing and payable in full; 

        (c)  Bank
may at its option without notice, cease advancing money or extending credit to or for the benefit of Borrower under this Agreement or any other agreement between
Borrower and Bank. 

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        (d)  No
Default (as defined in this Agreement, the Note and/or the Loan Documents) shall be waived by Bank except in writing and a waiver of any Default shall not be a waiver
of any other default or of the same default on a future occasion; 

        (e)  No
single or partial exercise of any right, power or privilege hereunder, or any delay in the exercise hereof, shall preclude other or further exercise of the rights of
the parties under this Agreement, the Note and/or the Loan Documents; and 

        (f)    No
forbearance on the part of Bank in enforcing any of its rights under this Agreement, the Note and/or the Loan Documents nor any renewal, extension or rearrangement of
any payment or covenant to be made or performed by Borrower hereunder shall constitute a waiver of any of the terms of this Agreement, the Note, and/or the Loan Documents, or of any such right. 

        10.    Cross-Default.    A Default under this Agreement shall also be a Default under the Note and the Loan Documents,
and vice versa. A Default under this Agreement, the Note and/or the Loan Documents shall also be a Default under every other note and other agreement between Bank and Borrower, and vice versa. 

        11.    Cross-Collateral.    Any Collateral for this Agreement, the Note and/or the Loan Documents shall also be
Collateral for any other obligations owing by Borrower to Bank. Notwithstanding the above, (i) to the extent that any portion of the Indebtedness is a consumer loan, that portion shall not be
secured by any deed of trust or mortgage on or other security interest in any of the undersigned's principal dwelling or in any of the undersigned's real property which is not a purchase money
security interest as to that portion, unless expressly provided to the contrary in another place, or (ii) if the undersigned (or any of them) has (have) given or give(s) Bank a deed of trust or
mortgage covering real property, that deed of trust or mortgage shall not secure this Note or any other indebtedness of the undersigned (or any of them), unless expressly provided to the contrary in
another place. 

        12.    Survival of Covenants, Agreements, Representations and Warranties.    All covenants, agreements,
representations and warranties (a) previously made (except as specifically subsequently modified); (b) made in connection herewith or with the Note and/or the Loan Documents and/or any
document contemplated hereby; or (c) executed hereafter (unless such document expressly states that this Agreement does not apply thereto) shall survive the borrowing hereunder and thereunder
and the repayment in full of the Note and/or the Loan Documents and any amendments, renewals or extensions thereof and shall be deemed to have been relied upon by Bank. All statements as to Borrower
contained in any certificate or other document delivered to Bank by Borrower at any time by or on behalf of Borrower shall constitute representations and warranties by Borrower. 

        13.    Miscellaneous.    The parties agree to the following miscellaneous terms: 

        (a)  This
Agreement, the Note and the Loan Documents shall be governed by California law, without regard for the effect of conflict of laws; 

        (b)  Borrower
agrees that it will pay all out of pocket costs of Bank and expenses (including, without limitation, Bank's reasonable attorneys' fees and costs and/or fees,
transfer charges and costs of Bank's in-house counsel) in connection with the preparation of this Agreement, the Note and/or the Loan Documents and/or the documents contemplated hereby and
the closing of the Loan; 

        (c)  This
Agreement, the Note and/or the Loan Documents shall inure to the benefit of and shall be binding upon the parties hereto and their respective successors and
assigns; provided, however, that Borrower shall not assign or transfer its right or obligations under this Agreement, the Note and/or the Loan Documents without the prior written consent of Bank; 

        (d)  Borrower
acknowledges that Bank may, subject to its full compliance with its obligations described in that certain letter agreement between Bank and Borrower dated as of
August 29, 

9

 

2002, provide information regarding Borrower and the Loan to Bank's parent, subsidiaries and affiliates and service providers, and 

        (e)  This
Agreement is an integrated agreement and supersedes all prior negotiations and agreements regarding the subject matter hereof. Any amendments hereto shall be in
writing and be signed by all parties hereto. 

        14.    JURY WAIVER.    THE BORROWER AND THE BANK ACKNOWLEDGE THAT THE RIGHT TO TRIAL BY JURY IS A CONSTITUTIONAL ONE,
BUT THAT IT MAY BE WAIVED. EACH PARTY, AFTER CONSULTING (OR HAVING HAD THE OPPORTUNITY TO CONSULT) WITH COUNSEL OF THEIR CHOICE, KNOWINGLY AND VOLUNTARILY, AND FOR THEIR MUTUAL BENEFIT, WAIVES ANY
RIGHT TO TRIAL BY JURY IN THE EVENT OF LITIGATION REGARDING THE PERFORMANCE OR ENFORCEMENT OF, OR IN ANY WAY RELATED TO, THIS AGREEMENT OR THE INDEBTEDNESS. 

        IN
WITNESS WHEREOF, the parties have executed this Business Loan Agreement as of the date first set forth above. 

	

Address of Borrower:	
 	

Borrower:
	 	 	 	 	 
	10165 McKellar Court
	 	Quidel Corporation

	

San Diego, CA 92121	
 	

By:	
 	

/s/  PAUL E. LANDERS      
	
	 	 	 	

	

 	
 	

Title:	
 	

Vice President, Chief Financial Officer
	
	 	 	 	

	 	 	 	 	 
	 	 	By:	 	 
	 	 	 	 	

	

 	
 	

Title:	
 	

 
	 	 	 	 	

	 	 	 	 	 
	 	 	 	 	 
	 	 	Comerica Bank-California

("Bank")
	 	 	 	 	 
	 	 	 	 	 
	 	 	By:	 	 
	 	 	 	 	/s/ Illegible

	 	 	 	 	 
	 	 	Title:	 	 
	 	 	 	 	

10

   ADDENDUM A TO BUSINESS LOAN AGREEMENT

(FINANCIAL COVENANTS)  

        1.    Definitions Relating to Financial Covenants.    

        Cash Flow as used in this Agreement means for any applicable period of determination, the net income (as later defined) (after deduction
for income taxes and other taxes of Borrower or its subsidiaries, determined by reference to income or profits of Borrower or its subsidiaries) for such period, plus, to the extent deducted in
computation of such net income, the amount of depreciation and amortization expense and the amount of deferred tax liability during such period, all as determined in accordance with GAAP. For Borrower
and its subsidiaries, the applicable period of determination will be N/A, beginning with the period
from            to            . 

        Cash Flow Coverage Ratio means the ratio, of "Net Cash Flow" divided by "Debt Service". 

        Current Assets as used in this Agreement means, as of any applicable date of determination, all unrestricted cash, CD's or marketable
securities, non-affiliated accounts receivable, United States Government securities and/or claims against the United States Government, and inventories (held for sale in the ordinary
course of business) of Borrower and its subsidiaries. 

        Current Liabilities as used in this Agreement means, as of any applicable date of determination, (i) all liabilities of Borrower or
its subsidiaries that should be classified as current in accordance with GAAP, including, without limitation, any portion of the principal of the Indebtedness under this Agreement, the Note and/or the
Loan Documents classified as current, plus (ii) to the extent not otherwise included, all liabilities of Borrower to any of its affiliates (including officers, directors, shareholders,
subsidiaries and commonly held companies), whether or not classified as current in accordance with GAAP unless same shall be the long term portion of Subordinated Debt (as defined below). 

        Current Ratio as used in this Agreement means, as of an applicable date of determination, Current Assets divided by Current Liabilities. 

        Debt shall mean, as of any applicable date of determination, all items of indebtedness, obligation or liability of a person, whether
matured or unmatured, liquidated or unliquidated, direct or indirect, absolute or contingent, joint or several, that should be classified as liabilities in accordance with GAAP excepting such
liabilities as shall be Subordinated Debt (as defined below), and contingent obligations of the Borrower and its subsidiaries with respect to debt of joint ventures that are not consolidated in the
consolidated financial statements of the Borrower under GAAP, provided that (a) such debt and contingent obligations are incurred in the ordinary
course of business, (b) such debt is fully secured by assets not reflected on the consolidated balance sheet of the Borrower (except as part of the investment of the Borrower in such joint
venture, and (c) such contingent obligations remain contingent. 

        Debt Service, as used herein, shall mean the sum of: (i) the principal and interest payments due within twelve (12) months
of the applicable quarter end, on all Long Term Debt and interest expense paid on Revolving Line of Credit for the previous (12) months of the applicable quarter end (ii) lease payments
due within twelve (12) months of the applicable quarter end on all Long Term Capital Leases. "Long Term Debt" and "Long Term Capital Leases," as used herein, shall mean those debts and lease
obligations or renewals or extensions thereof whose original terms exceeded one (1) year. 

        EBITDA as used in this Agreement as of any applicable date of determination shall mean the sum of (a) net income before taxes, plus
(b) interest expense, plus (c) depreciation and amortization expense. 

        Fixed Charges as used in this Agreement means, as of any applicable period of determination, with respect to Borrower and its
subsidiaries, the sum, without duplication, of (a) all interest paid or payable 

11

 

during such period by Borrower or its subsidiaries on debt of such person; plus (b) all payments of principal or other sums paid or payable during such period by such person with respect to
Debt having a final maturity more than one year from the date of creation of such Debt; plus (c) all debt discount and expense amortized or required to be amortized during such period by such
person; plus (d) the maximum amount of all rents and other payments paid or required to be paid by such person during such period under any lease or other contract or arrangement providing for
use of real or personal property in respect of which such person is obligated as a lessee, user or obligor; plus (e) all dividends and other distributions paid or payable by Borrower (including
S-Draws, if applicable, as per the Cash Flow Coverage Ratio above) or its subsidiaries or otherwise accumulating during such period on any capital stock of Borrower or its subsidiaries;
plus (f) all loans or other advances made by Borrower or its subsidiaries during such period to any affiliate of such person. The applicable period of determination will be N/A, beginning with
the period from            to            . 

        Net Cash Flow shall mean the sum of: (i) pre-tax income of Borrower, plus (ii) the amount of interest and
depreciation amortization charges less (iii) cash dividends, less (iv) income taxes, less (v) the amount the Borrower expended during the year for the acquisition of fixed assets
and /or leasehold
improvements, plus (vi) the amount of Long Term Debt Borrower incurred for the acquisition of such fixed assets and/or leasehold improvements, all of which will be computed for the twelve
(12) month period ending with the applicable quarter. 

        Net Income shall mean the net income (or loss) of a person for any period determined in accordance with GAAP but, however, excluding: 

        (a)  any
gains or losses on the sale or other disposition, not in the ordinary course of business, of investments or fixed or capital assets, and any taxes on the excluded
gains and any tax deductions or credits on account on any excluded losses; and 

        (b)  in
the case of the Borrower, net earnings of any person in which Borrower has an ownership interest, unless such net earnings shall have actually been received by
Borrower in the form of cash distributions. 

        Quick Assets as used in this Agreement means, as of any applicable date of determination, unrestricted cash, CD's or marketable securities
and net accounts receivable arising from the sale of goods and services, and United States Government securities and/or claims against the United States Government of Borrower and its subsidiaries. 

        Quick Ratio as used in this Agreement means, as of an applicable date of determination, Quick Assets divided by Current Liabilities,
excluding subordinated debt. 

        Tangible Effective Net Worth as used in this Agreement means Tangible Net Worth as of any applicable date of determination, increased by
the long term portion of Subordinated Debt (as defined below), if any, of Borrower or its subsidiaries and decreased by the following: Subscription lists, organization expenses, trade accounts
receivable converted to notes, and money due to Borrower or its subsidiaries from affiliates (including officers, directors, subsidiaries and commonly held companies). 

        Tangible Net Worth as used in this Agreement means, as of any applicable date of determination, the excess of: 

        (a)  the
net book value of all assets of Borrower and its subsidiaries (other than patents, patent rights, trademarks, trade names, franchises, copyrights, licenses,
goodwill, and similar intangible assets) after all appropriate deductions in accordance with GAAP (including, without limitation, reserves for doubtful receivables, obsolescence, depreciation and
amortization), minus 

        (b)  all
Total Liabilities of Borrower and its subsidiaries. 

12

 

        Total Liabilities as used in this Agreement means, as of any applicable date, the total of all items of indebtedness, obligation or
liability which, in accordance with GAAP consistently applied, would be included in determining the total liabilities of Borrower or its subsidiaries, including, without limitation, (a) all
obligations secured by any mortgage, pledge, security interest or other lien on property owned or acquired, whether or not the obligations secured thereby shall have been assumed; (b) all
obligations which are capitalized lease obligations; and (c) all guaranties, endorsements or other contingent or surety obligations with respect to the indebtedness of others, whether or not
reflected on the balance sheets of Borrower or its subsidiaries, including, without limitation, any obligation to furnish funds, directly or indirectly through the purchase of goods, supplies,
services, or by way of stock purchase, capital contribution, advance or loan or any obligation to enter into a contract for any of the foregoing. 

        Total Liabilities to Tangible Effective Net Worth Ratio means, as of any applicable date, Total Liabilities divided by Tangible Effective
Net Worth. 

        Subordinated Debt as used in this Agreement means indebtedness of Borrower to third parties which has been subordinated to all
Indebtedness owing by Borrower to Bank pursuant to a subordination agreement in form and content satisfactory to Bank. 

        Senior
Debt as used in this Agreement means obligations of Borrower outstanding to Bank. 

        Working Capital as used in this Agreement means, as of any applicable date of determination, Current Assets less Current Liabilities. 

	 	Other.  	 
	 	 	

	 	 	 
	

	 	 	 
	

        2.    Financial Covenants.    Borrower shall maintain the following financial ratios and covenants on a consolidated
and non-consolidated basis, which shall be monitored on a quarterly basis, except as noted below. 

        (a)  Working
Capital in an amount not less than     N/A     ; 

        (b)  Tangible
Effective Net Worth in an amount not less than $32,000,000 increased quarterly by 50% of net profit after taxes of such quarter. 

        (c)  A
ratio of Current Assets to Current Liabilities of not less than     N/A     ; 

        (d)  A
ratio of Quick Assets to Current Liabilities of not less than 1.00:1.00 ; 

        (e)  A
ratio of Total Liabilities (less Subordinated Debt as defined herein) to Tangible Effective Net Worth of less than
  1.50:1.00   ; 

        (f)    A
Cash Flow Coverage Ratio of not less than 1.75:1.00 ; 

        (g)  Net
income after taxes or S-Draws as per Cash Flow Coverage Ratio above of     N/A    ; 

        (h)  Profitability
on a     N/A     basis
                                         
       ;
 

        (i)    Fixed
Charge Ratio of
                        N/A                
         ; 

        (j)    Other
applicable terms: Senior Debt to EBITDA of not greater than 1.75:1.00 to be measured on a quarterly basis beginning June 30, 2002, based on a
four quarter rolling EBITDA, computed for the four quarter period ending on the last day of the of the applicable quarter. 

        All
financial covenants shall be computed in accordance with GAAP consistently applied except as otherwise specifically set forth in this Agreement. All monies due from affiliates
(including officers, directors and shareholders) shall be excluded from Borrower's assets for all purposes hereunder. 

13

QuickLinks

Exhibit 10.25

BUSINESS LOAN AGREEMENT<Page>

                                        1
                                                                    EXHIBIT 10.1

                INCENTIVE AND PERFORMANCE STOCK OPTION AGREEMENT
                                    UNDER THE
                1992 PRIMEDIA INC. STOCK PURCHASE AND OPTION PLAN
                             AS AMENDED (THE "PLAN")

     This Incentive Stock Option Agreement (the "Option Agreement") has been
entered into as of July 1, 2002 (the "Effective Date") between PRIMEDIA Inc., a
Delaware corporation (unless the context otherwise requires), together with any
subsidiary (as such term is defined in the Plan), (the "Corporation"), and
David S. Ferm (the "Optionee") pursuant to certain provisions of the Plan.

     1.   DEFINITIONS. Throughout this Option Agreement, capitalized terms not
          otherwise defined herein shall have the meanings indicated in the
          Plan.

     2.   OPTION GRANT. Subject to the terms and conditions set forth herein,
          the Corporation grants to the Optionee that number of options to
          purchase from the Corporation at the respective purchase prices set
          forth below per share, (as adjusted from time to time pursuant to the
          terms of this Agreement and the Plan, (the "Purchase Price"), up to,
          but not exceeding, in the aggregate, 100,000 shares of Common Stock
          (the "Options"), as adjusted pursuant to the Plan. Thirty percent of
          the Options will vest in accordance with the provisions of Section 4
          (a) (the "Time Vest Options") and 70% of the Options will vest in
          accordance with the provisions of Section 4 (b) (the "Performance Vest
          Options").

                                TIME VEST OPTIONS

<Table>
<Caption>
          NUMBER OF OPTIONS                           PURCHASE PRICE
          -----------------                           --------------
          <S>                                         <C>
          30% of Options                              $       4

                            PERFORMANCE VEST OPTIONS

          30% of Options                              $       5
          40% of Options                              $       6
</Table>

     3.   GRANT INTENDED AS INCENTIVE STOCK OPTION; OTHER OPTIONS. These Options
          are intended to be treated for federal income tax purposes as
          Incentive Stock Options under Section 422 of the Internal Revenue Code
          of 1986, as amended (the "Code"), to the maximum extent permissible
          under the Code. If for any reason, all or any of these Options cannot
          be treated as Incentive Stock Options under the Code, the part of
          these Options that cannot be treated as Incentive Stock Options shall
          be valid and outstanding non-qualified stock options. These Options
          are in addition to any other options heretofore or hereafter granted
          to the Optionee by the Corporation or any subsidiary but a duplicate
          original of this instrument shall not cause the grant of another
          option.

<Page>

                                        2

     4.   VESTING.

          (a)  TIME VEST OPTIONS. So long as the Optionee continues to be
               employed by the Corporation through the applicable vesting date,
               the Optionee's right to exercise these Options with respect to
               the number of Time Vest Options described in Section 2 shall vest
               on an equal prorata basis at the end of each of the 48 calendar
               months starting with the month in which the Effective Date
               occurs.

          (b)  PERFORMANCE VEST OPTIONS. So long as the Optionee continues to be
               employed by the Corporation or a subsidiary through the
               applicable vesting date, the Optionee's right to exercise these
               Options with respect to 100% of the Performance Vest Options
               shall vest on the eighth anniversary of the Effective Date;
               HOWEVER, Optionee's right to exercise the Performance Vest
               Options shall accelerate if the respective Target EBITDA (as
               defined below) is met in the respective years, as set forth in
               subsection (d) below.

          (c)  For purposes of this Section 4:

               (i)    "EBITDA" shall mean for any Fiscal Year an amount equal to
                      the Corporation's consolidated net income from continuing
                      businesses for such year PLUS the sum of interest expense,
                      provisions for income and franchise taxes, depreciation,
                      amortization of intangible assets, other (income) and
                      charges including non-cash compensation and non-recurring
                      charges, provision for severance, closures and
                      restructuring related costs, (gains) losses on the sales
                      of businesses and other, net, amortization of deferred
                      financing costs, provisions for impairment of investments,
                      impairments of goodwill and intangibles, expenses paid or
                      accrued for consulting services provided by Capstone
                      Consulting, and extraordinary charges MINUS the sum of
                      interest income and extraordinary gains, if any, for such
                      year. EBITDA shall be determined in a manner consistent
                      with the Corporation's prior practice as set forth in the
                      Corporation's financial statements forming part of its
                      Quarterly Report on Form 10-Q for the calendar quarter
                      ended March 31, 2002 (Footnote 15, Business Segment
                      Information) which will in any event be in accordance with
                      generally accepted accounting principles as in existence
                      on March 31, 2002.

               (ii)   "Fiscal Year" means any one of the Corporation's calendar
                      years 2002 through 2005, as applicable.

               (iii)  "Target EBITDA" shall mean, for any given Fiscal Year the
                      EBITDA set forth in Section 4.

          (d)  The Performance Vest Options shall accelerate in accordance with
               the following table when the respective Target EBITDA is met in
               any one of the Fiscal Years set forth in the column "Fiscal Year"
               next to the Target EBITDA:

<Table>
<Caption>
                NUMBER OF       PURCHASE                              FISCAL
TRANCHE          OPTIONS         PRICE         TARGET EBITDA           YEAR
---------     --------------    -------        -------------     ------------------
<S>           <C>                  <C>          <C>              <C>
Tranche 1     30% of Options       $   5        $ 300 million    2003
Tranche 2     30% of Options       $   6        $ 340 million    2003 or 2004
Tranche 3     10% of Options       $   6        $ 380 million    2003, 2004 or 2005
</Table>

<Page>

                                        3

          (e)  In the event that the Corporation fails to achieve, in respect of
               any given Fiscal Year, Target EBITDA set for such year, there
               shall be no acceleration of vesting of any Tranche as to which
               the Target EBITDA is not met in that Fiscal Year.

          (f)  The Corporation shall use its best efforts to determine EBITDA
               for each Fiscal Year by March 31 of the following Fiscal Year
               and, following such determination, the Corporation shall promptly
               notify Optionee of the results of such determination.

          (g)  In addition, the Compensation Committee may adjust any or all
               Target EBITDA to fairly and appropriately reflect the effect of
               any significant mergers, acquisitions, or dispositions approved
               by the Board of Directors in any case that was not contemplated
               in establishing the respective Target EBITDA; PROVIDED, HOWEVER,
               that in the event the Compensation Committee takes any such
               action, such adjustment shall be only the amount deemed
               reasonably necessary by the Compensation Committee, in the
               exercise of its good faith judgment, to accurately reflect the
               direct and measurable effect such event has on such Target
               EBITDA. The Compensation Committee's determination of such
               necessary adjustment shall be made within 60 days following the
               completion or closing of such event, and shall be based on the
               Corporation's accounting as set forth in its books and records
               and on the Corporation's financial plan pursuant to which the
               Target EBITDA was originally established.

          (h)  The Options shall vest on the last day of the Fiscal Year as to
               which the EBITDA Target is met.

     5.   CHANGE OF CONTROL. In the event of a "Change of Control" (as defined
          in this paragraph), then 100% of such unvested portion of the Time
          Vest Options shall become fully vested. A "Change of Control" for
          purposes of this Option Agreement shall mean:

                      (a) A transaction or series of related transactions
               whereby KKR Associates and/or its Affiliates ("KKR") (a) sells or
               otherwise disposes of beneficial ownership (within the meaning of
               Rule 13d-3 of the Securities Exchange Act of 1934, as amended
               (the "1934 Act")) of securities of the Corporation representing
               35% or more of the combined voting power of all securities of the
               Corporation entitled to vote in the election of directors of the
               Corporation to any single person or group (within the meaning of
               Section 13(d) (3) of the 1934 Act, and the rules and regulations
               promulgated thereunder), other than to an Affiliate of KKR, and
               in connection with or following such disposition such single
               person or group obtains control of a majority of the seats (other
               than vacant seats) on the Board.

                      (b) the Corporation adopts any plan of liquidation
               providing for the distribution of all or substantially all of its
               assets;

                      (c) all or substantially all of the assets or business of
               the Corporation is disposed of pursuant to a merger,
               consolidation or other transaction (unless the shareholders of
               the Corporation immediately prior to such merger, consolidation
               or other transaction beneficially own, directly or indirectly, in
               substantially the same proportion as they owned the voting stock
               of the Corporation, all of the voting stock or other ownership
               interests of the entity or entities, if any, that succeed to the
               business of the Corporation); or the Corporation combines with
               another Corporation and is the

<Page>

                                        4

               surviving corporation but, immediately after the combination, the
               shareholders of the Corporation immediately prior to the
               combination hold, directly or indirectly, 50% or less of the
               voting stock of the combined Corporation (there being excluded
               from the number of shares held by such shareholders, but not from
               the voting stock of the combined Corporation, any shares received
               by affiliates of such other Corporation in exchange for stock of
               such other Corporation).

     6.   EXPIRATION OF OPTIONS. The Options granted hereunder may not be
          exercised to any extent after the first to occur of the following
          events (the "Expiration Date"):

          (a)  The tenth anniversary of the Grant Date; or

          (b)  The first anniversary of the effective date of the Optionee's
               termination of employment by reason of death, Retirement or
               Permanent Total Disability or

          (c)  90 days after termination of the Optionee's employment for any
               reason other than for death, Permanent or Total Disability or
               Retirement; or

          (d)  If the Committee so determines, the effective date of either the
               merger or consolidation of Corporation into another corporation,
               or the exchange or acquisition by another corporation of all or
               substantially all of Corporation's assets or 80% or more of its
               then outstanding voting stock, or the recapitalization,
               reclassification, liquidation or dissolution of Corporation. At
               least ten (10) days prior to the effective date of such event,
               the Committee shall give the Optionee notice of such event if the
               Options have not yet been fully exercised and the Expiration Date
               has not yet occurred. Nothing in this provision shall negate the
               acceleration of the Time Vest Options upon a change.

     7.   EXERCISE.

                      (a) During the Optionee's lifetime, only the Optionee may
               exercise the Options or any exercisable portion thereof. After
               the death of the Optionee and prior to the close of business on
               the Expiration Date, the Options or any exercisable portion
               thereof may be exercised by the Optionee's personal
               representative, or by any person empowered to do so under the
               Optionee's will or under the then applicable laws of descent and
               distribution. The party entitled to exercise the Options shall be
               referred to herein as the "Exercising Party".

                      (b) The Options or any exercisable portion thereof may be
               exercised in whole or in part at any time prior to the close of
               business on the Expiration Date; provided, however, that any
               exercise shall be for whole shares only.

                      (c) The Options or any exercisable portion thereof may be
               exercised solely by delivering to the Office of the Secretary of
               Corporation all of the following prior to the closing of business
               on the Expiration Date:

               (i)   Notice in writing, signed by the Exercising Party, stating
                      the number of Shares with respect to which the Options are
                      being exercised;

               (ii)  Full payment (in cash, by check, or Shares owned more than
                      six months which shall be valued at their fair market
                      value, or by a combination thereof) for the Shares with

<Page>

                                        5

                      respect to which such Options or portion thereof are
                      exercised, plus any withholdings applicable thereto; and

               (iii) In the event that the Exercising Party is not the Optionee,
                      appropriate proof, in the sole judgement of Corporation,
                      of the right of such person to exercise the Options.

          (d)  No Options shall become exercisable as to any additional Shares
               following the effective date of the termination of employment of
               the Optionee for any reason other than the death, Permanent or
               Total Disability or Retirement of Optionee; and

          (e)  In the event of a termination of employment because of death,
               Permanent or Total Disability or Retirement, the Options shall
               become exercisable as to all Shares as of the effective date of
               such termination of employment

          (f)  Notwithstanding the other provisions of this Section 7, the
               Committee may take such reasonable additional steps that it
               reasonably deems appropriate, including the requirement of
               additional documents, representations and actions of or by the
               Exercising Party, to ensure the observance and performance of the
               representations set forth in the notice of exercise, and
               compliance with applicable federal or state securities laws or
               regulations.

          (g)  In addition, Corporation shall not be required to issue or
               deliver any certificate representing Shares prior to the
               obtaining of approval or other clearance from any state or
               federal governmental agency or securities exchange that the
               Committee shall, in its absolute discretion, determine to be
               necessary or advisable.

          (h)  The Shares deliverable upon the exercise of the Options, or any
               portion thereof, may be either previously authorized but unissued
               shares of Common Stock or issued Shares that have been reacquired
               subsequently by Corporation. Such Shares shall be fully paid and
               nonassessable.

          (i)  Each Exercising Party shall be obligated to notify Corporation in
               writing when any Shares are sold, transferred or otherwise
               disposed of.

          (j)  Neither the Optionee nor any Exercising Party shall be a
               stockholder of the Corporation or have any of the rights or
               privileges thereof in respect of any Shares unless and until
               certificates representing such Shares shall have been issued by
               Corporation to such Optionee or other Exercising Party.

          (k)  Notwithstanding the foregoing, the Options may be exercised by
               the Exercising Party utilizing a "cashless exercise" or "brokered
               exercise" transaction.

     8.   POWERS OF COMMITTEE. The Committee shall have the power to interpret
          the Plan and this Agreement and to adopt such rules for the
          administration, interpretation and application of the Plan as are
          consistent therewith and to interpret or revoke any such rules. All
          actions taken and all interpretations and determinations made by the
          Committee shall be final and binding upon the Optionee or other
          Exercising Party, Corporation and all other interested persons. No
          member of the Committee shall be personally liable for any action,
          determination or interpretation made in good faith with respect to the
          Plan or this Agreement. In its absolute discretion, the Board of
          Directors of Corporation may at any

<Page>

                                        6

          time and from time to time exercise any and all rights and duties of
          the Committee under the Plan and this Agreement.

     9.   OPTIONS NOT TRANSFERABLE. The Optionee's rights under this Agreement
          may not be transferred or assigned, and neither the Options nor any
          interest or right therein or part thereof shall be liable for the
          debts, contracts or engagements of the Optionee or his or her legal
          successors or shall be subject to disposition by transfer, alienation,
          anticipation, pledge, encumbrance, assignment or any other means,
          whether such disposition be voluntary or involuntary or occur by
          operation of law by judgement, levy, attachment, garnishment or any
          other legal or equitable proceedings (including bankruptcy), and any
          attempted disposition thereof shall be null and void and of no effect.
          Notwithstanding the foregoing, this Section 9 shall not prevent
          transfers by will or by the applicable laws of descent and
          distribution. All of the terms and provisions of this Agreement shall
          be binding on, and shall inure to the benefit of, the respective legal
          successors and assigns of the parties.

     10.  NO OBLIGATION TO EXERCISE OPTIONS. The grant and acceptance of these
          Options imposes no obligation on the Optionee to exercise.

     11.  ADJUSTMENTS. The Option Purchase Price and the number of shares of
          Common Stock subject to these Options shall be subject to adjustment
          from time to time in accordance with Section 7.1 of the Plan.

     12.  RIGHTS AS SHAREHOLDER. An Optionee shall have no rights as a
          stockholder of the Corporation with respect to any shares underlying
          the Options until the day of the payment of the Option Purchase Price
          in accordance with the terms and provisions hereof.

     13.  PAYMENT OF WITHHOLDING TAXES. Upon the Optionee's exercise of his or
          her Options in accordance with the provisions of this Option
          Agreement, the Optionee shall pay to the Corporation at the time of
          delivery of the notice and payment of the Purchase Price the amount of
          any federal, state or local income tax withholding or other employment
          related tax that may be due upon the exercise of the Options. The
          determination of the amount of any such federal, state or local income
          tax withholding or other employment tax due in such event shall be
          made by the Corporation and shall be binding upon the Optionee.

     14.  RESERVATION AND REGISTRATION OF SHARES. The Corporation shall at all
          times during the term of the Options reserve and keep available such
          number of shares of Common Stock as will be sufficient to satisfy the
          requirements of this Agreement. The Shares issuable upon the exercise
          of the Options are registered under the Securities Act of 1933 (the
          "Act") and the Corporation shall use its best efforts to maintain the
          registration under the Act of the Shares issuable upon exercise of the
          Options.

     15.  DEFERRAL OF ISSUANCE TO COMPLY WITH APPLICABLE LAWS. Anything in this
          Option Agreement to the contrary notwithstanding, if, at any time
          specified herein for the issuance of Common Stock resulting from the
          exercise of these Options, any law, regulation or requirements of any
          governmental authority having jurisdiction in the premises shall
          require either the Corporation or the Optionee, in the judgment of the
          Corporation, to take any action in connection with the shares then to
          be issued, then the issue of such shares shall be deferred until such
          action shall have been taken.

<Page>

                                        7

     16.  ADJUSTMENTS IN OPTIONS PURSUANT TO MERGER, CONSOLIDATION, ETC. In the
          event that the outstanding shares of the stock subject to Options are,
          from time to time, changed into or exchanged for a different number or
          kind of shares of the Corporation or other securities of the
          Corporation by reason of a merger, consolidation, recapitalization,
          reclassification, stock split, stock dividend, combination of shares,
          or otherwise, the Corporation shall make an adjustment in the number
          and kind of shares and/or the amount of consideration as to which or
          for which, as the case may be, such Options, or portions thereof then
          unexercised, shall be exercisable, in such manner as the Corporation
          determines is reasonably necessary to maintain as nearly as
          practicable the rights, benefits and obligations that the parties
          would have had absent such event. Any such adjustment made by the
          Corporation shall be final and binding upon the Optionee, the
          Corporation and all other interested persons.

     17.  MISCELLANEOUS.

          (a)  Any notice to be given under the terms of this Agreement to the
               Corporation shall be addressed to Corporation as follows:

                  PRIMEDIA, Inc.
                  745 Fifth Avenue
                  New York, NY 10151
                  Attention: Secretary

               Any notice to be given to the Optionee shall be sent to the
               address given beneath his or her signature to this Agreement. By
               a notice given pursuant to this Section 17, either party may
               hereafter designate a different address for notices. Any notice
               that is required to be given to the Optionee shall, if the
               Optionee is then deceased, be given to the Optionee's personal
               representative if such representative has previously informed
               Corporation of his or her status and address by written notice
               under this Section 17. All notices and other communications under
               this Option Agreement shall be in writing and shall have been
               deemed duly given when delivered personally, mailed by registered
               mail, return receipt requested or sent by documented overnight
               delivery service.

          (b)  Titles are provided herein for convenience of reference only
               and are not to serve as a basis for interpretation or
               construction of this Option Agreement.

               (i)    This Option Agreement, the Options and any Shares issued
                      hereunder shall be subject to all of the terms and
                      provisions of the Plan to the extent applicable. In the
                      event of any conflict between this Option Agreement and
                      the Plan, the terms of the Plan shall control.

               (ii)   Notwithstanding the provisions of any agreement relating
                      to Optionee's employment heretofore entered into, none of
                      the Performance Vest Options shall vest upon a Change of
                      Control.

          (c)  No provision of this Option Agreement may be amended or modified
               except by an instrument or instruments in writing signed by the
               parties hereto. Any party may waive compliance by another with
               any of the provisions of this Option Agreement, provided that (a)
               no waiver of any provision hereof shall be construed as a waiver
               of any other provision or subsequent breach and (b) any such
               waiver shall be in writing. The failure

<Page>

                                        8

               of any party hereto to enforce at any time any provision hereof
               shall not be construed to be a waiver of such provision, nor in
               any way to affect the validity hereof of any part hereof or the
               right of any party thereafter to enforce each and every such
               provision.

                      (d) To the extent not governed by the laws of the United
               States, including the Code, this Agreement shall be governed by,
               and construed and enforced in accordance with, the laws of the
               State of Delaware (without regard to conflicts of law principles
               for such state).

                      (e) Corporation and the Optionee hereby irrevocably submit
               to the jurisdiction of any New York or Delaware state court, or
               any Federal court in the Southern District of New York or in
               Delaware in any action or proceeding arising out of or relating
               to this Option Agreement, and the parties hereto irrevocably
               agree that all claims in respect of such action or proceeding
               shall be heard and determined only in such courts. Corporation
               and the Optionee hereby consent to and grant to any such court
               jurisdiction over the persons of such parties and over the
               subject matter of any such dispute and agree that delivery or
               mailing of any process or other papers in the manner provided in
               Section 17 herein, or in such other manner as may be permitted by
               law, shall be valid and sufficient service thereof.

          IN WITNESS WHEREOF, this Agreement has been executed and delivered by
     the parties hereto on the date first set forth above.

                                                   PRIMEDIA Inc.

                                                   By:
                                                      --------------------------
                                                         Beverly C. Chell
                                                         Title: Vice Chairman

          AGREED AND ACCEPTED BY:

          -----------------------------
          Optionee Signature

          Optionee Name (Print):
                                --------------------------------------
          Social Security Number:
                                -------------------------------------
          Address:
                      --------------------------------------------------

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

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

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

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