CMAC INVESTMENT CORP
S-4, 1999-05-06
SURETY INSURANCE
Previous: CMAC INVESTMENT CORP, 10-K/A, 1999-05-06
Next: BREED TECHNOLOGIES INC, 424B3, 1999-05-06



<PAGE>   1
 
      AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON MAY 6, 1999
 
                                                     REGISTRATION NO. 333-
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                       SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549
                            ------------------------
 
                                    FORM S-4
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
                            ------------------------
 
                          CMAC INVESTMENT CORPORATION
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)
 
<TABLE>
<S>                                  <C>                                  <C>
              DELAWARE                               6719                              23-2691170
  (STATE OR OTHER JURISDICTION OF        (PRIMARY STANDARD INDUSTRIAL               (I.R.S. EMPLOYER
   INCORPORATION OR ORGANIZATION)            CLASSIFICATION NO.)                  IDENTIFICATION NO.)
</TABLE>
 
                               1601 MARKET STREET
                             PHILADELPHIA, PA 19103
                                 (215) 564-6600
  (ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE, OF
                   REGISTRANT'S PRINCIPAL EXECUTIVE OFFICES)
                            ------------------------
 
                                HOWARD S. YARUSS
 
              SENIOR VICE PRESIDENT, SECRETARY AND GENERAL COUNSEL
 
                          CMAC INVESTMENT CORPORATION
                               1601 MARKET STREET
                             PHILADELPHIA, PA 19103
                                 (215) 564-6600
 (NAME, ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE,
                             OF AGENT FOR SERVICE)
                            ------------------------
 
                                   COPIES TO:
 
<TABLE>
<S>                                                         <C>
                  JAMES W. MCKENZIE, JR.                                           DIANE G. KERR
                MORGAN, LEWIS & BOCKIUS LLP                                    DAVIS POLK & WARDWELL
                    1701 MARKET STREET                                         450 LEXINGTON AVENUE
                  PHILADELPHIA, PA 19103                                        NEW YORK, NY 10017
                      (215) 963-5000                                              (212) 450-4000
</TABLE>
 
                            ------------------------
 
    APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC:  As soon as
practicable after the effectiveness of this Registration Statement and the
satisfaction or waiver of all other conditions to the merger of Amerin
Corporation with and into the Registrant, described in the enclosed joint proxy
statement/prospectus.
 
    If the securities being registered on this form are being offered in
connection with the formation of a holding company and there is compliance with
General Instruction G, check the following box. [ ]
 
    If this form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, check the following box and
list the Securities Act registration statement number of the earlier effective
registration statement for the same offering. [ ]__________.
 
    If this form is a post-effective amendment filed pursuant to Rule 462(d)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. [ ]__________.
                            ------------------------
 
                        CALCULATION OF REGISTRATION FEE
 
<TABLE>
<CAPTION>
- ---------------------------------------------------------------------------------------------------------------------------------
- ---------------------------------------------------------------------------------------------------------------------------------
                                                                                          PROPOSED
                                                                  PROPOSED                MAXIMUM
                                                                  MAXIMUM                AGGREGATE               AMOUNT OF
     TITLE OF EACH CLASS OF              AMOUNT TO           OFFERING PRICE PER           OFFERING              REGISTRATION
   SECURITIES TO BE REGISTERED        BE REGISTERED(1)            SHARE(2)                PRICE(2)                 FEE(3)
- ---------------------------------------------------------------------------------------------------------------------------------
<S>                                <C>                     <C>                     <C>                     <C>
Common Stock of Registrant,
  $0.001 par value...............        14,444,600                $42.40               $612,398,995              $51,956
- ---------------------------------------------------------------------------------------------------------------------------------
- ---------------------------------------------------------------------------------------------------------------------------------
</TABLE>
 
(1) Represents the maximum number of shares of Common Stock, $0.001 par value
    per share, of the Registrant issuable in connection with the merger
    contemplated by the merger agreement.
 
(2) Estimated solely for the purpose of determining the registration fee in
    accordance with Rule 457(f)(1). The proposed maximum aggregate offering
    price is based upon the product of (i) $22.61 (the average of the high and
    low prices of Amerin Corporation common stock on May 5, 1999) and (ii) the
    sum of the number of shares of Amerin Corporation common stock outstanding,
    plus the number of shares of Amerin Corporation common stock issuable prior
    to the effective time of the merger upon the exercise of options and
    warrants to purchase Amerin Corporation common stock. The proposed maximum
    offering price per share is based upon the proposed maximum aggregate
    offering price divided by the amount to be registered.
 
(3) The registration fee for the securities registered hereby has been
    calculated pursuant to Section 6(b) of the Securities Act, as 0.0278% of the
    proposed maximum aggregate offering price. A fee of $118,291 was paid on
    December 23, 1998 pursuant to Rules 14a-6(a)(1) and 0-11 promulgated under
    the Exchange Act, in respect of the merger upon filing by CMAC Investment
    Corporation and Amerin Corporation of a preliminary joint proxy statement
    relating thereto. Pursuant to Rule 457(b) promulgated under the Securities
    Act and Section 14(g)(2) of the Exchange Act and Rule 0-11 promulgated
    thereunder, the amount of such previously paid fee has been credited against
    the registration fee payable in connection with this filing.
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>   2
 
[CMAC Logo]                                                        [Amerin Logo]
 
                   MERGER PROPOSED -- YOUR VOTE IS IMPORTANT
 
The boards of directors of CMAC Investment Corporation and Amerin Corporation
have agreed on a merger designed to create one of the nation's largest mortgage
insurance companies, measured by market share. The surviving corporation in the
merger will be CMAC, which will change its name to Radian Group Inc. Radian will
remain headquartered in Philadelphia, Pennsylvania. Radian will be quoted on the
New York Stock Exchange under the symbol "RDN".
 
If the merger is completed, Amerin stockholders will receive 0.5333 shares of
Radian common stock for each share of Amerin common stock that they own. After
the merger, CMAC stockholders will continue to own their existing shares, which
will be shares of Radian common stock when CMAC changes its name at the closing
of the merger.
 
The merger cannot be completed unless the stockholders of both companies approve
it. We have each scheduled special meetings for you to vote on the merger. YOUR
VOTE IS VERY IMPORTANT. At CMAC's special meeting, CMAC stockholders will also
vote on an amendment to CMAC's existing equity compensation plan.
 
This joint proxy statement/prospectus provides you with detailed information
about the proposed merger and plan amendment. In addition, you may obtain
information about our companies from documents that we have filed with the
Securities and Exchange Commission. We encourage you to read this entire
document carefully.
Frank P. Filipps
- ------------------------------------------------------
Frank P. Filipps
President and Chief Executive Officer
CMAC Investment Corporation
The dates, times and places of the meetings are as follows:
 
FOR CMAC STOCKHOLDERS:
10:00 a.m., June 9, 1999
Morgan, Lewis & Bockius LLP
1701 Market Street
Philadelphia, PA 19103
 
FOR AMERIN STOCKHOLDERS:
9:00 a.m., June 9, 1999
 
Amerin Corporate Headquarters
200 East Randolph Drive
Chicago, IL 60601
 
Whether or not you plan to attend your meeting, please take the time to vote by
completing and mailing the enclosed proxy card to us as soon as possible. If you
sign, date and mail your proxy card without indicating how you want to vote,
your proxy will be counted as a vote in favor of the proposals submitted to you
for your approval at your meeting. If you fail to return your card, the effect
will be a vote against the merger. The failure of CMAC stockholders to return
their cards will not affect the approval of the plan amendment.
 
PLEASE SEE "RISK FACTORS" BEGINNING ON PAGE 11 OF THIS JOINT PROXY
STATEMENT/PROSPECTUS FOR A DESCRIPTION OF THE RISKS ASSOCIATED WITH YOUR
APPROVAL OF THE MERGER PROPOSALS.
ROY J. KASMAR
- ------------------------------------------------------
Roy J. Kasmar
President and Chief Operating Officer
Amerin Corporation
 
Neither the SEC nor any state securities regulators have approved the Radian
common stock to be issued under this joint proxy statement/prospectus or
determined if this joint proxy statement/prospectus is accurate or adequate. Any
representation to the contrary is a criminal offense.
 
          This joint proxy statement/prospectus is dated May 6, 1999.
  It is first being mailed to stockholders of CMAC and Amerin on May 10, 1999.
<PAGE>   3
 
                               TABLE OF CONTENTS
 
<TABLE>
<S>                                     <C>
QUESTIONS AND ANSWERS ABOUT THE
  CMAC/AMERIN MERGER..................    1
SUMMARY...............................    2
RISK FACTORS..........................   11
CAUTIONARY STATEMENT CONCERNING
  FORWARD-LOOKING STATEMENTS AND PRO
  FORMA INFORMATION...................   18
THE MERGER............................   19
  Background of the Merger............   19
  CMAC's Reasons for the Merger;
     Recommendation of the CMAC
     Board............................   21
  Amerin's Reasons for the Merger;
     Recommendation of the Amerin
     Board............................   22
  Accounting Treatment................   24
  Federal Income Tax Consequences.....   25
  Regulatory Approvals................   27
  No Appraisal Rights.................   27
COMPARATIVE PER SHARE MARKET PRICE AND
  DIVIDEND INFORMATION................   28
UNAUDITED PRO FORMA COMBINED CONDENSED
  FINANCIAL STATEMENTS................   29
NOTES TO UNAUDITED PRO FORMA COMBINED
  CONDENSED FINANCIAL STATEMENTS......   35
OPINIONS OF FINANCIAL ADVISORS........   36
  Opinion of Amerin's Financial
     Advisor..........................   36
  Opinion of CMAC's Financial
     Advisor..........................   40
OWNERSHIP OF CMAC, AMERIN AND
  RADIAN..............................   46
INTERESTS OF CERTAIN PERSONS IN THE
  MERGER..............................   49
  Post-Merger Board...................   49
  Post-Merger Management..............   49
  Kasmar Employment Agreement.........   49
  Kasmar Change of Control
     Agreement........................   50
  Amerin Stock Option and Severance
     Arrangements.....................   51
  Morgan Stanley Fee..................   52
  Indemnification and Insurance.......   53
THE MERGER AGREEMENT..................   54
  General.............................   54
  Merger Consideration................   54
  Treatment of Amerin Stock Options...   54
  Exchange of Shares..................   54
  Covenants and Representations and
     Warranties.......................   55
  Conditions to the Merger............   57
  Termination of the Merger
     Agreement........................   58
  Amendments to CMAC Certificate of
     Incorporation....................   58
  Amendments to CMAC Bylaws...........   58
  Amendments..........................   59
  Expenses............................   59
THE SPECIAL MEETINGS..................   60
  Times and Places; Purposes..........   60
  Voting Rights; Votes Required for
     Approval.........................   60
  Proxies.............................   61
DIRECTORS AND MANAGEMENT OF RADIAN
  FOLLOWING THE MERGER................   63
  Directors...........................   63
  Committees of the Board of
     Directors........................   65
  Management and Executive Officers of
     Radian...........................   65
  Compensation of Directors...........   65
  Executive Compensation..............   66
COMPARISON OF STOCKHOLDERS' RIGHTS....   67
  Comparison of Current CMAC
     Stockholder Rights and Radian
     Stockholder Rights Following the
     Merger...........................   67
  Comparison of Current Amerin
     Stockholder Rights and Radian
     Stockholder Rights Following the
     Merger...........................   68
DESCRIPTION OF RADIAN CAPITAL STOCK
  FOLLOWING THE MERGER................   71
  Authorized Capital Stock............   71
  Common Stock........................   71
  Series Preferred Stock..............   72
  $4.125 Series Preferred Stock.......   72
  Series A Preferred Stock............   73
  Anti-takeover Provisions............   73
</TABLE>
 
                                                               TABLE OF CONTENTS
                                        i
<PAGE>   4
<TABLE>
<S>                                     <C>
  Preemptive Rights...................   75
  Transfer Agent and Registrar........   76
  Stock Exchange Listing; Delisting
     and Deregistration of Amerin
     Common Stock.....................   76
  Federal Securities Laws
     Consequences; Stock Transfer
     Restriction Agreements...........   76
THE AMENDMENT TO THE CMAC INVESTMENT
  CORPORATION EQUITY COMPENSATION
  PLAN................................   77
  The Proposal........................   77
  Vote Required for Approval..........   77
  Description of the Plan.............   77
  Federal Income Tax Consequences.....   80
LEGAL MATTERS.........................   82
INDEPENDENT ACCOUNTANTS...............   82
FUTURE STOCKHOLDER PROPOSALS..........   83
WHERE YOU CAN FIND MORE INFORMATION...   84
</TABLE>
 
<TABLE>
<S>            <C>
Appendix I:    Agreement and Plan of Merger
Appendix II:   Restated Certificate of
               Incorporation of CMAC
Appendix III:  Opinion of Schroder & Co.
               Inc.
Appendix IV:   Opinion of Donaldson, Lufkin
               & Jenrette Securities
               Corporation
Appendix V:    Amendment 1999-1 to CMAC
               Investment Corporation
               Equity Compensation Plan
</TABLE>
 
TABLE OF CONTENTS
                                       ii
<PAGE>   5
 
               QUESTIONS AND ANSWERS ABOUT THE CMAC/AMERIN MERGER
 
Q:  WHY ARE THE TWO COMPANIES PROPOSING TO MERGE?
 
A:  This merger means that you will own a stake in the nation's second largest
private mortgage insurance company, measured by market share. We expect that the
merged company will operate under a single brand and combine our complementary
strengths. We believe that this merger will allow us to increase revenues,
reduce our costs through economies of scale and improve our service, creating
stockholder value in years to come.
 
Q:  WHAT DO I NEED TO DO NOW?
 
A:  Just mail your signed proxy card as soon as possible. The Amerin meeting
will take place on June 9, 1999. The CMAC meeting will take place on June 9,
1999. The boards of directors of both CMAC and Amerin unanimously recommend that
you vote in favor of the proposed merger.
 
Q:  SHOULD I SEND IN MY STOCK CERTIFICATES NOW?
 
A:  No. After the merger is completed, we will send Amerin stockholders written
instructions for exchanging their stock certificates. CMAC stockholders will
retain their existing stock certificates.
 
Q:  WHEN DO YOU EXPECT THE MERGER TO BE COMPLETED?
 
A:  We are working toward completing the merger as quickly as possible. We hope
to complete the merger during the second quarter of 1999.
 
Q:  WHAT ARE THE TAX CONSEQUENCES TO STOCKHOLDERS OF THE MERGER?
 
A:  The exchange of shares by Amerin stockholders for shares in Radian generally
will be tax-free to Amerin stockholders for federal income tax purposes, except
for any tax payable on cash received for fractional shares. The merger will be
tax-free to CMAC stockholders for federal income tax purposes. To review the
material federal income tax consequences in greater detail, see pages 25 through
26.
 
Q:  WHAT WILL THE LOGO OF THE NEW COMPANY LOOK LIKE?
                                 [RADIAN LOGO]
 
                                                           QUESTIONS AND ANSWERS
                                        1
<PAGE>   6
 
                                    SUMMARY
 
     This summary highlights selected information from this document and may not
contain all of the information that is important to you. To understand the
merger fully and for a more complete description of the legal terms of the
merger, you should carefully read this entire document. See "Where You Can Find
More Information" on page 84.
 
                                 THE COMPANIES
 
CMAC INVESTMENT CORPORATION
1601 Market Street
Philadelphia, Pennsylvania 19103
(215) 564-6600
 
CMAC Investment Corporation, headquartered in Philadelphia, is the parent
company of Commonwealth Mortgage Assurance Company, which provides private
mortgage insurance and risk management services to mortgage lending institutions
through offices in key cities nationwide. Private mortgage insurance protects
lenders from default-related losses on residential first mortgage loans made to
home buyers who make down payments of less than 20% of a home's purchase price
and facilitates the sale of mortgage loans in the secondary mortgage market.
Commonwealth Mortgage Assurance Company will change its name after the merger to
Radian Guaranty Inc.
 
AMERIN CORPORATION
200 East Randolph Drive, 49th Floor
Chicago, Illinois 60601
(312) 540-0078
 
Amerin Corporation, headquartered in Chicago, is the parent company of Amerin
Guaranty Corporation, which provides private mortgage insurance coverage in the
United States to mortgage bankers, savings institutions, commercial banks and
other lenders.
 
                      WHAT YOU WILL RECEIVE IN THE MERGER
 
At the closing of the merger:
 
- - Amerin will merge with and into CMAC;
 
- - CMAC will survive the merger; and
 
- - CMAC will change its name to Radian.
 
In the merger, Amerin stockholders will receive 0.5333 of a share of Radian
common stock for each share of Amerin common stock that they own. This exchange
ratio is fixed; it will not change even if the market price of CMAC or Amerin
common stock increases or decreases between now and the date the merger is
completed. Accordingly, Amerin stockholders will not be able to determine the
value of the shares of Radian common stock they would receive in the merger at
the time they vote on the merger.
 
Radian will not issue fractional shares. Instead, Amerin stockholders will
receive a check in payment for any fractional shares based on the market value
of the Radian common stock.
 
After the merger, CMAC stockholders will continue to own their existing shares,
which will be shares of Radian common stock when CMAC changes its name.
 
Example: If you currently own 100 shares of Amerin common stock, then after the
merger you will receive 53 shares of Radian common stock and a check for the
market value of the .33 fractional share. If you currently own 100 shares of
CMAC common stock, then you will continue to hold those 100 shares after the
merger.
 
                           OUR REASONS FOR THE MERGER
 
We believe that the merger presents an opportunity to create one of the nation's
largest mortgage insurance companies. By combining, we believe that we will be
able to increase our revenues, reduce our costs and improve our service. We
expect that the combined company will operate under a single brand, build on our
common strengths and provide our stockholders and customers with added value.
 
Our goal is to integrate the operations of our two companies efficiently and
expeditiously. We will seek to maximize complementary strengths and improve
operating and financial results.
 
In reaching their recommendations in favor of the merger, each of our boards of
directors considered a number of uncertainties, including:
 
- - the rapidly changing regulatory and competitive environment in the mortgage
  insurance industry;
SUMMARY
                                        2
<PAGE>   7
 
- - the challenge of combining the businesses of two dynamic corporations and the
  risk of diverting management resources from other strategic opportunities and
  operational matters for an extended period of time; and
 
- - the risks to each company of continuing on a stand-alone basis.
 
     To review the reasons for the merger in greater detail, as well as related
uncertainties, see pages 21 through 24.
 
                      OUR RECOMMENDATIONS TO STOCKHOLDERS
 
TO CMAC STOCKHOLDERS:
 
The CMAC board believes that the merger is in your best interest and unanimously
recommends that you vote FOR the proposal to approve and adopt the merger
agreement and the related transactions, including the issuance of shares of
Radian common stock and the amendment and restatement of CMAC's certificate of
incorporation.
 
The CMAC board has approved an amendment to the CMAC Investment Corporation
Equity Compensation Plan. This amendment authorizes an additional 1,000,000
shares of CMAC common stock to be issued under that plan and increases the
maximum amount of shares for which a grantee may receive options (and related
stock appreciation rights) in any one calendar year from 75,000 shares to
150,000 shares. The CMAC board believes that this amendment is in your best
interest and unanimously recommends that you vote FOR the proposal to approve
and adopt the amendment to the plan.
 
TO AMERIN STOCKHOLDERS:
 
The Amerin board believes that the merger is in your best interest and
unanimously recommends that you vote FOR the proposal to approve and adopt the
merger agreement and the merger.
 
                                     VOTING
 
RECORD DATE; VOTING POWER (SEE PAGE 60)
 
You are entitled to vote at your stockholders' meeting if you owned shares of
common stock as of the close of business on April 12, 1999, the record date.
 
On the record date, there were 22,727,536 shares of CMAC common stock
outstanding. For each share of CMAC common stock that CMAC stockholders owned on
that date, they will have one vote at their meeting for the CMAC merger proposal
and the plan amendment proposal.
 
On the record date, there were 26,507,768 shares of Amerin common stock
outstanding. For each share of Amerin common stock that Amerin stockholders
owned on that date, they will have one vote at their meeting for the Amerin
merger proposal.
 
VOTES REQUIRED
 
The favorable vote of a majority of the shares of CMAC common stock is required
to approve the CMAC merger proposal.
 
The favorable vote of a majority of the shares of CMAC common stock present in
person or represented by proxy at the CMAC meeting and entitled to vote is
required to approve the plan amendment proposal. Approval of the CMAC merger
proposal is not conditioned on approval of the plan amendment proposal.
Likewise, approval of the plan amendment proposal is not conditioned on approval
of the CMAC merger proposal.
 
The favorable vote of a majority of the outstanding shares of Amerin common
stock is required to approve the Amerin merger proposal.
 
STOCK OWNERSHIP OF MANAGEMENT AND CERTAIN STOCKHOLDERS
 
On the record date, directors and executive officers of CMAC and their
affiliates owned and were entitled to vote 84,141 shares of CMAC common stock,
or less than 1.0% of the shares of CMAC common stock outstanding on that date.
 
On the record date, directors and executive officers of Amerin and their
affiliates owned and were entitled to vote 1,708,218 shares of Amerin common
stock, or approximately 6.5% of the shares of Amerin common stock outstanding on
that date.
 
                                   THE MERGER
 
The merger agreement is attached as Appendix I to this joint proxy
statement/prospectus. We encourage you to read the merger agreement,
                                                                         SUMMARY
                                        3
<PAGE>   8
 
which is the legal document that governs the merger.
 
OWNERSHIP OF RADIAN FOLLOWING THE MERGER (SEE PAGES 46 THROUGH 48)
 
The shares of CMAC common stock held by CMAC stockholders immediately before the
merger will represent approximately 62% of the outstanding Radian common stock
immediately after the merger. The shares of Radian common stock issued to Amerin
stockholders in the merger will represent approximately 38% of the outstanding
Radian common stock immediately after the merger. Based on the number of shares
of CMAC common stock and Amerin common stock currently outstanding, we
anticipate that Radian will have approximately 36,894,702 shares of common stock
outstanding after the merger.
 
BOARD OF DIRECTORS AND MANAGEMENT OF RADIAN FOLLOWING THE MERGER (SEE PAGES 63
THROUGH 66)
 
If the merger is completed, we expect that Frank P. Filipps, the president and
chief executive officer of CMAC, will be the chairman and chief executive
officer of Radian and that Roy J. Kasmar, the president and chief operating
officer of Amerin, will be the president and chief operating officer of Radian.
 
The board of directors after the merger will consist of fourteen members, nine
of whom will be designated by CMAC and five of whom will be designated by
Amerin.
 
We have named other persons to be key executives of Radian after the merger.
 
OTHER INTERESTS OF OFFICERS AND DIRECTORS IN THE MERGER (SEE PAGES 49 THROUGH
53)
 
In considering our boards' recommendations that you vote in favor of the merger,
you should be aware that several executive officers and directors of CMAC and
Amerin have interests in the merger that are different from, or in addition to,
your interests. Each of these persons could receive significant compensation and
other benefits if the merger is completed. Please refer to pages 49 through 53
for more information concerning employment, severance and stock option
arrangements of our executive officers.
 
CONDITIONS TO THE MERGER (SEE PAGES 57 THROUGH 58)
The completion of the merger depends upon satisfying a number of conditions,
including the following:
 
- - the approval of our stockholders;
 
- - no law or injunction prohibits the merger;
 
- - no downgrading of either of our claims-paying abilities has occurred;
 
- - the receipt of letters from each of our independent accountants to the effect
  that the merger will qualify for pooling of interests accounting treatment;
  and
 
- - the receipt of opinions from each of our counsels stating that the merger will
  be tax-free to us and our stockholders.
 
The conditions to the merger, other than the first two listed above, may be
waived by whichever company is entitled to assert the relevant condition.
 
TERMINATION OF THE MERGER AGREEMENT (SEE PAGE 58)
 
We can agree to terminate the merger agreement without completing the merger,
and either of us may terminate the merger agreement if any of the following
occurs:
 
- - the merger is not completed by June 30, 1999;
 
- - the stockholders of either CMAC or Amerin reject the merger;
 
- - a court or other governmental authority permanently prohibits the merger;
 
- - the other party materially breaches or fails to comply with any of its
  representations, warranties or obligations under the merger agreement;
 
- - the other party's board withdraws or modifies, in a manner adverse to the
  company seeking to terminate the merger agreement, its recommendation of the
  merger to its stockholders;
 
- - the other party materially and knowingly breaches the covenant restricting
  negotiations with a third party concerning an alternative transaction; or
 
SUMMARY
                                        4
<PAGE>   9
 
- - either party's board recommends a third party takeover proposal and decides to
  enter into an agreement with respect to that takeover proposal after
  determining that it is superior to the merger.
 
TERMINATION FEES (SEE PAGE 58)
 
The merger agreement generally requires CMAC or Amerin to pay to the other party
a termination fee of $22.0 million if the merger agreement is terminated because
the other party:
 
- - materially and knowingly breaches the covenant restricting negotiations with a
  third party concerning an alternative transaction;
 
- - withdraws or modifies, in a manner adverse to the company seeking to terminate
  the merger agreement, its recommendation of the merger to its stockholders; or
 
- - the other party's board recommends a third party takeover proposal after
  determining that such proposal is superior to the merger.
 
ACCOUNTING TREATMENT (SEE PAGES 24 THROUGH 25)
 
We expect the merger to qualify as a "pooling of interests," which means we will
treat our companies as if they had always been combined for accounting and
financial reporting purposes. We have conditioned the merger on our receipt of
letters from each of our independent accounting firms stating that the merger
will qualify for pooling of interests accounting treatment.
 
OPINIONS OF FINANCIAL ADVISORS (SEE PAGES 36 THROUGH 45)
 
In deciding to approve the merger, our boards considered opinions from our
respective financial advisors as to the fairness of the exchange ratio from a
financial point of view. CMAC received an opinion from Schroder & Co. Inc. and
Amerin received an opinion from Donaldson, Lufkin & Jenrette Securities
Corporation. These opinions are attached as Appendix III and Appendix IV to this
joint proxy statement/prospectus. We encourage you to read and consider these
opinions.
 
MATERIAL FEDERAL INCOME TAX CONSEQUENCES (SEE PAGES 25 THROUGH 26)
 
We have structured the merger so that our stockholders will not recognize any
gain or loss for federal income tax purposes in the merger except with respect
to cash received by Amerin stockholders for fractional shares of Radian common
stock. We have conditioned the merger on our receipt of legal opinions stating
that the merger will be tax-free to each of us and our stockholders.
 
REGULATORY APPROVALS (SEE PAGE 27)
 
All material regulatory approvals necessary to permit us to close the merger
have been obtained.
 
CMAC'S CERTIFICATE OF INCORPORATION AND BYLAWS
 
The merger agreement provides that, as part of the merger, CMAC will restate its
certificate of incorporation and bylaws to provide, among other things, that:
 
- - CMAC change its name to Radian;
 
- - material transactions, including mergers and business combinations and the
  amendment of the CMAC certificate of incorporation or bylaws, if not approved
  by at least two thirds of the Radian board, must be approved by at least two
  thirds of the stockholders of Radian;
 
- - the size of the Radian board may only be changed, until the Radian annual
  meeting of stockholders to be held in the year 2000, with the approval of two
  thirds of the Radian board and, thereafter, by a majority of the Radian board;
 
- - vacancies and newly created directorships resulting from an increase in the
  size of the board may only be filled, until the Radian annual meeting of
  stockholders to be held in the year 2000, with the approval of two thirds of
  the remaining directors and, thereafter, only with the approval of a majority
  of the remaining directors at a meeting at which a quorum is present; and
 
- - until the Radian annual meeting of stockholders to be held in the year 2000,
  two thirds of the Radian board shall constitute a quorum for the transaction
  of business and, thereafter, a \majority of the entire Radian board shall
  constitute a quorum.
 
                                                                         SUMMARY
                                        5
<PAGE>   10
 
The form of restated certificate of incorporation is attached as Appendix II.
 
NO APPRAISAL RIGHTS (SEE PAGE 27)
 
Under Delaware law, neither CMAC stockholders nor Amerin stockholders are
entitled to an appraisal of the value of their shares in connection with the
merger.
 
COMPARATIVE PER SHARE MARKET PRICE INFORMATION (SEE PAGE 28)
 
CMAC's common stock is listed on the New York Stock Exchange. Amerin's common
stock is listed on The Nasdaq National Market. On November 20, 1998, the last
full trading day on the New York Stock Exchange prior to the public announcement
of the proposed merger, CMAC common stock closed at $43.938 per share. On
November 20, 1998, the last full trading day on The Nasdaq National Market prior
to the public announcement of the proposed merger, Amerin common stock closed at
$20.875 per share. On May 5, 1999, the most recent practicable date prior to the
printing of this joint proxy statement/ prospectus, CMAC common stock closed at
$44.0625 per share and Amerin common stock closed at $22.625 per share.
 
LISTING OF RADIAN COMMON STOCK
 
We will list the shares of Radian common stock to be issued in connection with
the merger on the New York Stock Exchange.
 
SUMMARY
                                        6
<PAGE>   11
 
COMPARATIVE PER SHARE INFORMATION
 
     We have summarized below the per share information for our respective
companies on a historical, pro forma combined and equivalent basis. The Amerin
per share equivalents are calculated by multiplying the unaudited pro forma
combined per share amounts by 0.5333. Amerin stockholders will receive 0.5333
shares of Radian common stock in exchange for each share of Amerin common stock.
 
                       COMPARATIVE PER SHARE INFORMATION
 
<TABLE>
<CAPTION>
                                                               AT OR FOR THE YEAR ENDED
                                                                     DECEMBER 31,
                                                              --------------------------
                                                               1998      1997      1996
                                                              ------    ------    ------
<S>                                                           <C>       <C>       <C>
UNAUDITED PRO FORMA COMBINED
Net income per common share -- basic........................  $ 3.78    $ 3.09    $ 2.41
Net income per common share -- diluted......................    3.67      2.99      2.35
Cash dividends per share(1).................................    0.07      0.07      0.06
Book value per common share.................................   25.30
AMERIN PER SHARE EQUIVALENTS
Net income per common share -- basic........................  $ 2.02    $ 1.65    $ 1.29
Net income per common share -- diluted......................    1.96      1.59      1.25
Cash dividends per share....................................    0.04      0.04      0.03
Book value per common share.................................   13.49
AMERIN -- HISTORICAL
Net income per common share -- basic........................  $ 1.94    $ 1.56    $ 1.08
Net income per common share -- diluted......................    1.92      1.54      1.07
Cash dividends per share....................................      --        --        --
Book value per common share.................................   15.44
CMAC -- HISTORICAL
Net income per common share -- basic........................  $ 3.87    $ 3.19    $ 2.64
Net income per common share -- diluted......................    3.72      3.06      2.55
Cash dividends per share....................................    0.12      0.12      0.11
Book value per common share.................................   23.03
</TABLE>
 
- ---------------
(1) Unaudited pro forma combined cash dividends per share reflect the sum of the
    dividends declared by CMAC divided by the number of shares that would have
    been outstanding for the periods presented after adjusting the Amerin shares
    by the exchange ratio of 0.5333.
 
                                                                         SUMMARY
                                        7
<PAGE>   12
 
              SUMMARY SELECTED HISTORICAL AND UNAUDITED PRO FORMA
                    COMBINED CONDENSED FINANCIAL INFORMATION
 
     We are providing the following financial information to aid you in your
analysis of the financial aspects of the merger. We derived this information
from audited financial statements for 1994 to 1998. The information provided is
only a summary. You should read it together with our historical financial
statements and related notes contained in the annual reports and other
information that we have filed with the SEC. See "Where You Can Find More
Information" on page 84.
 
        CMAC INVESTMENT CORPORATION -- HISTORICAL FINANCIAL INFORMATION
 
<TABLE>
<CAPTION>
                                                     AT OR FOR THE YEAR ENDED DECEMBER 31,
                                              ----------------------------------------------------
                                                1998       1997       1996       1995       1994
                                              --------   --------   --------   --------   --------
                                              (DOLLARS IN THOUSANDS, EXCEPT FOR PER SHARE AMOUNTS)
<S>                                           <C>        <C>        <C>        <C>        <C>
Premiums earned.............................  $282,152   $237,710   $187,921   $137,134   $106,123
Net investment income.......................    38,550     33,787     30,011     25,952     22,618
Provision for losses........................   132,023    117,149     91,894     57,803     38,586
Policy acquisition costs....................    36,139     31,287     26,850     23,356     22,466
Other operating expenses....................    38,980     26,381     21,277     16,290     13,116
Pretax income...............................   125,824    102,493     82,575     68,185     56,363
Net income..................................    91,054     74,967     62,221     50,804     41,129
Net income per share........................      3.72       3.06       2.55       2.09       1.70
Cash dividends per share....................      0.12       0.12       0.11       0.10       0.10
 
Assets......................................  $968,173   $782,065   $649,198   $540,346   $435,463
Investments.................................   736,310    596,930    513,158    437,537    358,745
Reserve for losses..........................   201,276    148,628    108,206     67,301     46,666
Unearned premiums...........................    49,424     49,332     53,384     56,115     61,862
Redeemable preferred stock..................    40,000     40,000     40,000     40,000     40,000
Common stockholders' equity.................   522,969    429,943    356,344    298,616    239,748
Book value per share........................     23.03      19.08      15.91      13.42      10.91
</TABLE>
 
SUMMARY HISTORICAL AND PRO FORMA FINANCIALS
                                        8
<PAGE>   13
 
             AMERIN CORPORATION -- HISTORICAL FINANCIAL INFORMATION
 
<TABLE>
<CAPTION>
                                                     AT OR FOR THE YEAR ENDED DECEMBER 31,
                                              ----------------------------------------------------
                                                1998       1997       1996       1995       1994
                                              --------   --------   --------   --------   --------
                                              (DOLLARS IN THOUSANDS, EXCEPT FOR PER SHARE AMOUNTS)
<S>                                           <C>        <C>        <C>        <C>        <C>
Premiums earned.............................  $123,100   $ 92,329   $ 62,349   $ 27,559   $  5,237
Net investment income.......................    21,312     18,607     16,871      7,612      4,818
Provision for losses........................    34,354     30,272     20,681      7,757        262
Policy acquisition costs....................    22,340     10,520      8,485      6,641      2,456
Other operating expenses....................    16,046     14,643     10,623      6,915      5,765
Compensation charge from initial public
  offering..................................        --         --         --     35,741         --
Pretax income (loss)........................    72,089     56,668     39,592    (21,392)     2,008
Net income (loss)...........................    51,183     40,759     28,229    (22,811)     2,008
Pay-in-kind preferred dividends.............        --         --         --      5,287      5,067
Net income (loss) per share -- diluted......      1.92       1.54       1.07      (2.32)     (0.36)
Cash dividends per share....................        --         --         --         --         --
Assets......................................  $545,232   $440,558   $365,731   $316,934   $107,261
Investments.................................   439,142    377,720    328,793    296,982     96,246
Reserve for losses..........................    43,849     31,280     18,730      7,092        262
Unearned premiums...........................    26,114     23,352     20,525     12,710      6,323
Redeemable preferred stock..................        --         --         --         --     40,755
Common stockholders' equity.................   409,230    350,155    300,609    274,137     58,081
Book value per share........................     15.44      13.39      11.53      10.55       5.59
</TABLE>
 
                                     SUMMARY HISTORICAL AND PRO FORMA FINANCIALS
                                        9
<PAGE>   14
 
UNAUDITED PRO FORMA COMBINED CONDENSED FINANCIAL INFORMATION
 
     We expect that the merger will be accounted for as a "pooling of
interests." This means that, for accounting and financial reporting purposes, we
will treat our companies as if they had always been combined. For a more
detailed description of pooling of interests accounting, see "The Merger --
Accounting Treatment" on pages 24 through 25.
 
     We have presented below unaudited pro forma financial information that
reflects the pooling of interests method of accounting. This information is
intended to give you a better picture of what our businesses might have looked
like had they always been combined. We prepared the pro forma income statement
and balance sheet by adding or combining the historical amounts of each company.
We then adjusted the combined amounts to conform the presentation methods by the
companies. The companies may have performed differently if they were combined.
You should not rely on the pro forma information as being indicative of the
historical results that we would have had or the future results that we will
experience after the merger. See "Unaudited Pro Forma Combined Condensed
Financial Statements" on pages 29 through 35.
 
                          UNAUDITED PRO FORMA COMBINED
 
<TABLE>
<CAPTION>
                                                             AT OR FOR THE YEAR ENDED DECEMBER 31,
                                                             --------------------------------------
                                                                1998          1997          1996
                                                             ----------    ----------    ----------
                                                                     (DOLLARS IN THOUSANDS,
                                                                 EXCEPT FOR PER SHARE AMOUNTS)
<S>                                                          <C>           <C>           <C>
Premiums earned............................................   $405,252      $330,039      $250,270
Net investment income......................................     59,862        52,394        46,882
Provision for losses.......................................    166,377       147,421       112,575
Policy acquisition costs...................................     58,479        41,807        35,335
Other operating expenses...................................     59,720        41,592        31,902
Pretax income..............................................    197,913       159,161       122,167
Net income.................................................    142,237       115,726        90,450
Net income per share -- diluted............................       3.67          2.99          2.35
Cash dividends per share...................................       0.07          0.07          0.06
</TABLE>
 
<TABLE>
<S>                                                         <C>           <C>         <C>
Assets....................................................  $1,513,405
Investments...............................................   1,175,452
Reserve for losses........................................     245,125
Unearned premiums.........................................      75,538
Redeemable preferred stock................................      40,000
Common stockholders' equity...............................     932,199
Book value per share......................................       25.30
</TABLE>
 
SUMMARY HISTORICAL AND PRO FORMA FINANCIALS
                                       10
<PAGE>   15
 
                                  RISK FACTORS
 
LOSING THE BUSINESS OF ANY OF OUR MAJOR LENDERS COULD HARM OUR FINANCIAL
PERFORMANCE.
 
     Radian will be dependent on a small number of lenders for a substantial
portion of its business risk. Our top ten lenders were responsible for 48.9% of
our combined direct primary risk in force, which refers to an aggregate amount
equal to the principal amount of each of our insured loans multiplied by the
applicable coverage percentage on that loan, at December 31, 1998. At December
31, 1998, our three largest single customers, including branches and affiliates
of such customers, measured by our combined direct primary risk in force, were
Norwest Mortgage, Inc. (16.1%), Countrywide Home Loans, Inc. (9.3%) and Chase
Manhattan Mortgage Corporation (4.8%).
 
     The concentration of business with our lenders may increase as a result of
mergers or other factors. Such lenders may reduce the amount of business
currently given to us or cease doing business with us altogether. Our master
policies and related lender agreements do not, and by law cannot, require our
lenders to do business with us. The loss of business from any of our major
lenders could materially adversely affect our business and financial results.
 
THE VALUE OF THE RADIAN COMMON STOCK ISSUABLE IN THE MERGER WILL CHANGE IF THE
VALUE OF OUR COMMON STOCK RISES OR FALLS.
 
     In the merger, each share of Amerin common stock will convert into 0.5333
of a share of Radian common stock. We will not adjust this exchange ratio if the
price of CMAC common stock or Amerin common stock increases or decreases.
Therefore, the value of the Radian shares an Amerin stockholder receives could
vary based on fluctuations in the price of CMAC common stock, as well as the
price of the Amerin common stock they will exchange in the merger. The
anticipated value of the Radian shares may not be the same on the date of the
special meetings or at the effective time of the merger as it is on the date of
this joint proxy statement/prospectus.
 
WE MAY NOT HAVE PRICED OUR POLICIES ADEQUATELY TO PAY FOR DEFAULTS OR CLAIMS.
 
     While we believe that we have and Radian will have adequate reserves and
conservative underwriting policies, the premiums we have received and Radian
will receive under our insurance policies might not be adequate to compensate us
for unanticipated defaults and claims.
 
WE MAY FACE NEW COMPETITION FROM FANNIE MAE AND FREDDIE MAC WHICH MAY REDUCE OUR
REVENUES.
 
     Fannie Mae and Freddie Mac have both recently announced programs under
which less mortgage insurance coverage may be required on loans with down
payments of less than 20%. If these programs are successful, or if Fannie Mae or
Freddie Mac elect to assume more of the credit risks on these loans or use
credit enhancements other than mortgage insurance, less mortgage insurance would
be used. This would in turn reduce our revenues.
 
INCREASED CLAIMS AND LOSSES ON OUR POLICIES COULD HARM OUR FINANCIAL
PERFORMANCE.
 
     The factors identified below affect us and the private mortgage insurance
industry in general and will affect Radian. Any of these factors could cause
claims and losses on the policies issued by either of us prior to the merger and
by Radian after the merger to increase. Any increase in claims and losses may
materially adversely affect Radian's financial condition and results of
operations.
 
                                                                    RISK FACTORS
                                       11
<PAGE>   16
 
- -   The concentration of our combined risk in force in relatively few states
could increase our claims and losses.
 
     Radian can be particularly affected by economic downturns in regions where
large portions of our business are concentrated. As of December 31, 1998, we had
a relatively high percentage of our combined primary risk in force concentrated
in the following ten states:
 
     -- California (18.6% or approximately $3.6 billion)
 
     -- Florida (7.4% or approximately $1.4 billion)
 
     -- New York (6.5% or approximately $1.3 billion)
 
     -- Texas (5.7% or approximately $1.1 billion)
 
     -- New Jersey (4.0% or approximately $0.8 billion)
 
     -- Georgia (3.9% or approximately $0.8 billion)
 
     -- Pennsylvania (3.8% or approximately $0.7 billion)
 
     -- Arizona (3.6% or approximately $0.7 billion)
 
     -- Illinois (3.5% or approximately $0.7 billion)
 
     -- Colorado (2.8% or approximately $0.5 billion)
 
     We expect that Radian's primary risk in force will be similarly
concentrated. Continued and prolonged adverse economic conditions in these
states could result in high levels of claims and losses. In addition,
refinancing activity, such as that which has occurred in 1998, can have the
effect of concentrating Radian's insurance in force in economically weaker
areas, since loans in areas experiencing property value appreciation are less
likely to require mortgage insurance at the time of refinancing than are loans
in areas experiencing limited or no property value appreciation.
 
- -   We cannot cancel policies or adjust renewal premiums to protect us from
unanticipated claims or losses.
 
     Generally, we cannot cancel the mortgage insurance coverage we provide.
Also, we generally fix renewal premium rates for the life of the policy when
issued. If the risk underlying a particular product we offer develops more
adversely than anticipated or if national and regional economies undergo
unanticipated stress, we cannot increase renewal premium rates or cancel
coverage to offset against such adverse developments.
 
- -   Our combined risk in force consists of loans with high loan-to-value ratios,
which generally result in more claims than loans with lower loan-to-value
ratios.
 
     At December 31, 1998:
 
     -- 48.6% or approximately $9.5 billion of our combined primary risk in
        force consisted of mortgage loans with loan-to-value ratios, or LTVs,
        greater than 90%
 
     -- 45.3% or approximately $8.9 billion of our combined primary risk in
        force consisted of mortgage loans with LTVs greater than 90%, but less
        than or equal to 95%
 
     -- 3.3% or approximately $0.6 billion of our combined primary risk in force
        consisted of mortgage loans with LTVs greater than 95%
 
     -- 9.5% or approximately $1.9 billion of our combined primary risk in force
        consisted of adjustable rate mortgage loans
 
Loans with LTVs greater than 90% are expected to have claim incidence rates
substantially higher than mortgage loans with LTVs equal to or less than 90%. In
the case of adjustable rate mortgage loans, such loans generally have higher
claim incidence rates than fixed rate loans. The proportion of such higher LTV
loans in Radian's risk in force will be somewhat higher than the comparable
proportion for the overall
 
RISK FACTORS
                                       12
<PAGE>   17
 
mortgage insurance industry due to Amerin's recent entry into the mortgage
insurance business and an overall industry trend in recent years toward a
greater percentage of loans with higher LTVs.
 
Our premium rates are based upon the expected risk of claim on the insured loan
and take into account the LTVs, loan type, mortgage term, occupancy status and
coverage percentage. In addition, the premium rates take into account
persistency, operating expenses and reinsurance costs, as well as profit and
capital needs and the prices offered by competitors. However, premiums earned,
and the associated investment income, may ultimately prove to be inadequate to
compensate for future losses.
 
- -   General economic factors may adversely affect our loss experience.
 
     We believe that Radian's loss experience, and the loss experience of other
mortgage insurers, would be materially and adversely affected by extended
national or regional economic recessions, falling housing values, rising
unemployment rates, interest rate volatility or combinations of such factors.
Such economic events could also materially adversely impact the demand for
housing and, consequently, mortgage insurance.
 
- -   We expect our loss experience to increase as our policies age.
 
     The majority of claims under private mortgage insurance policies have
historically occurred during the third through the sixth years after issuance of
the policies. As of December 31, 1998, approximately 77.2% of our combined
primary risk in force was written since January 1, 1996. This means that less
than 23% of our combined primary risk in force has reached the beginning of the
expected peak claims period. As a result, Radian's loss experience is expected
to significantly increase as its policies continue to age. If the claim
frequency on such risk in force significantly exceeds the claim frequency that
was assumed in setting premium rates, Radian's financial condition, results of
operations and cash flows would be materially and adversely affected.
 
- -   Our reserves may be insufficient to cover claims paid or loss-related
expenses incurred.
 
     Our results of operations would be adversely affected if our reserves are
insufficient to cover the actual related claims paid and loss-related expenses
incurred. We establish loss reserves to recognize the liability for unpaid
losses related to insurance in force on mortgage loans which are in default.
These loss reserves are based upon the estimated claim rate and related claim
amount. These estimates are regularly reviewed and updated using the most
current information available. Such reserves are necessarily based on estimates
and the ultimate claim rate and the resulting aggregate amount of claims may
vary from such estimates. Any resulting adjustments, which may be material, are
reflected in our then current consolidated results of operations. Radian's
reserves may not be adequate to cover ultimate loss development on incurred
defaults. Generally accepted accounting principles do not permit Radian to
establish loss reserves in respect of estimated potential defaults that may
occur in the future.
 
PAYING A SIGNIFICANT NUMBER OF CLAIMS UNDER THE POOL INSURANCE WE WRITE COULD
HARM OUR FINANCIAL PERFORMANCE.
 
     Radian expects to continue offering traditional pool insurance, which is
generally considered riskier than primary insurance. Under primary insurance, an
insurer's exposure is limited to a specified percentage of any unpaid principal,
delinquent interest and related expenses on an individual loan. Under
traditional pool insurance, there is an aggregate exposure limit -- a "stop
loss" -- on a pool of loans, which amount is generally between 1% and 10% of the
initial aggregate loan balance of the entire pool of loans. Under its pool
insurance, Radian could be required to pay the full amount of every loan in the
pool that is in default and upon which a claim is made until the stop loss is
reached, rather than a percentage of that amount. If Radian is required to pay a
significant number of claims under its pool insurance, then its financial
condition and results of operations could be materially and adversely affected.
 
                                                                    RISK FACTORS
                                       13
<PAGE>   18
 
OUR PROGRAM OF DELEGATED UNDERWRITING MAY CAUSE US TO INSURE, AND PAY CLAIMS
RELATED TO, UNACCEPTABLY RISKY LOANS THAT WE WOULD NOT HAVE INSURED IF WE HAD
UNDERWRITTEN THEM OURSELVES.
 
     CMAC and other mortgage insurers offer programs of delegated underwriting
to some of their customers. Amerin has written substantially all of its
insurance on a delegated underwriting basis. Radian expects to continue offering
delegated underwriting to customers of Amerin and CMAC that are currently
authorized to use delegated underwriting, and may expand the availability of
delegated underwriting to additional customers. The performance of loans insured
through programs of delegated underwriting has not been tested over an extended
period of time or over portfolios almost exclusively written based on delegated
underwriting. The performance of such loans has not been tested in a period of
adverse economic conditions.
 
     Once a lender is accepted for delegated underwriting, the insurer generally
may not refuse to insure, or rescind coverage on, a particular loan originated
by such lender even if the insurer reevaluates the loan's risk profile or if the
lender fails to follow delegated underwriting criteria. Radian's ability to take
action against a lender will be limited by our access to data with which to
assess the risk of a lender's insured loans and to assess compliance with
applicable criteria. Moreover, Radian would remain at risk for any loans insured
by a lender prior to our curtailing or terminating a lender's delegated
underwriting authority. A lender could possibly cause Radian to insure a
material volume of loans with unacceptable risk profiles before such lender's
delegated underwriting authority was terminated.
 
IF OUR CLAIMS PAYING ABILITY RATING IS DOWNGRADED AFTER THE MERGER, THEN
MORTGAGE LENDERS AND THE MORTGAGE SECURITIZATION MARKET MAY NOT PURCHASE
MORTGAGES OR MORTGAGE-BACKED SECURITIES INSURED BY US WHICH WOULD HARM OUR
FINANCIAL PERFORMANCE.
 
     Moody's and S&P have rated the respective financial strength and
claims-paying ability of both Commonwealth Mortgage Assurance Company, CMAC's
principal insurance subsidiary, and Amerin Guaranty Corporation, Amerin's
principal insurance subsidiary, as "Aa3" and "AA". Any downgrading of our
ratings below such levels due to the merger or after the merger would have a
material adverse effect on our results of operations and prospects. Adverse
developments in our subsidiaries' financial condition or results of operations,
by virtue of underwriting or investment losses or otherwise, or changes in the
views of the rating agencies, could cause the rating agencies to lower their
ratings. Our claims-paying ability ratings may be downgraded by one or more
rating agencies in the future. If our ratings fall below "Aa3" from Moody's or
"AA" from S&P, then national mortgage lenders, and a large segment of the
mortgage securitization market, including Fannie Mae and Freddie Mac, generally
will not purchase mortgages or mortgage-backed securities insured by us.
 
AN INCREASE IN OUR SUBSIDIARIES' RISK TO CAPITAL RATIO MAY PREVENT THEM FROM
WRITING NEW INSURANCE, WHICH WOULD HARM OUR FINANCIAL PERFORMANCE.
 
     Moody's and S&P have agreed with Amerin and its subsidiaries to limit the
amount of insurance risk that may be written by such subsidiaries as a condition
of the issuance and maintenance of their "Aa3" and "AA" ratings. Following the
merger, Radian may be required to enter into similar agreements. If so, Radian's
subsidiaries have several alternatives available to control their risk to
capital ratios, including obtaining capital contributions from Radian,
purchasing additional quota share or excess of loss reinsurance or reducing the
amount of new business written. However, Radian may not be able to raise
additional funds, or do so on a timely basis, in order to make a capital
contribution to its subsidiaries. In addition, reinsurance may not be available
to Radian's subsidiaries or, if available, may not be available on satisfactory
terms. A material reduction in statutory capital, whether resulting from
underwriting or investment losses or otherwise, or a disproportionate increase
in risk in force, could increase the risk to capital ratio. An increase in the
risk to capital ratio could limit Radian's subsidiaries' ability to write new
business, which then could materially adversely affect Radian's results of
operations and prospects.
 
RISK FACTORS
                                       14
<PAGE>   19
 
     Fannie Mae and Freddie Mac announced higher coverage requirements effective
in the first quarter of 1995 for mortgage loans with high LTVs. These
requirements have increased the average coverage percentages of new insurance
written by us, as well as increased premiums earned on policies subject to such
requirements. These requirements have increased our risk in force and risk to
capital ratio. We expect that they will continue to have some incremental effect
on the risk to capital ratio in the future.
 
WE FACE COMPETITION FROM PRIVATE MORTGAGE INSURERS, GOVERNMENTAL AGENCIES AND
OTHERS WHICH MAY REDUCE OUR REVENUES.
 
     The mortgage insurance industry is increasingly competitive. Such
competition may reduce our revenues, which could in turn decrease the value of
your investment. Our principal sources of direct and indirect competition are:
 
- - other private mortgage insurers, some of which are well capitalized,
  diversified public companies or their affiliates, and will have higher
  claims-paying ability ratings and greater access to capital than Radian;
 
- - federal and state governmental and quasi-governmental agencies, principally
  the Federal Housing Administration; and
 
- - mortgage lenders that forego third-party coverage and retain the full risk of
  loss on their high LTV loans.
 
     The United States private mortgage insurance industry is both highly
dynamic and intensely competitive. Many factors bear on the relative position of
the private mortgage insurance industry versus the "direct" government and
quasi-governmental competition and the "indirect" competition of major lending
institutions, including:
 
- - legislative and/or regulatory initiatives which affect the FHA's competitive
  position; and
 
- - the capital adequacy of, and alternative business opportunities for, lending
  institutions.
 
     According to Inside Mortgage Finance, for 1998, the shares of the private
mortgage insurance market based on new primary insurance written were as
follows:
 
<TABLE>
<CAPTION>
                                                                MARKET
INSURER                                                         SHARE
- -------                                                         ------
<S>                                                             <C>
Mortgage Guaranty Insurance Corporation                          23.1%
GE Capital Mortgage Insurance Corporation                        16.4%
PMI Mortgage Insurance Co.                                       16.1%
United Guaranty Residential Insurance Company                    12.7%
Republic Mortgage Insurance Company                               9.7%
Triad Guaranty Insurance Corporation                              2.6%
</TABLE>
 
In this same period, our combined market share was 19.4%. However, Radian's
market share of new insurance written may not grow and could decrease in the
future.
 
IF FANNIE MAE AND FREDDIE MAC CONTINUE TO REDUCE THEIR COVERAGE REQUIREMENTS,
THEN WE COULD LOSE PREMIUM REVENUE.
 
     Fannie Mae recently announced that it would require less coverage on loans
written through its Desktop Underwriter program. This reduction of coverage will
result in a reduction in the amount of premium we earn in connection with loans
under this program. Freddie Mac may announce a similar reduction in coverage
requirements. Furthermore, Fannie Mae and Freddie Mac may further reduce
coverage requirements, but only to the extent consistent with their charters
which specifically require mortgage insurance. In the event of such reductions,
we could lose some of our premium revenue.
 
                                                                    RISK FACTORS
                                       15
<PAGE>   20
 
OUR BUSINESS PARTNERS' SYSTEMS MAY NOT BE YEAR 2000 COMPLIANT, WHICH MAY PREVENT
US FROM CONDUCTING OUR BUSINESS AS USUAL AND HARM OUR FINANCIAL PERFORMANCE.
 
     At the end of this year, computer programs using two digits rather than
four to define the applicable year may recognize a date using "00" as the year
1900 rather than the year 2000. This could result in system failures or
miscalculations causing a temporary inability to engage in normal business
activities. Currently, CMAC believes its most likely Year 2000 worst case
scenario would involve the failure of the loan origination, renewal processing
and default reporting systems of its business partners. In that case, CMAC would
rely on the contingency plans described below to conduct its operations.
 
     To date, CMAC has experienced very few problems related to Year 2000
testing. Any problems requiring immediate modification have been fixed in CMAC's
day to day operating environment. CMAC believes that it does not have material
exposure to the Year 2000 issue with respect to its information systems since
its existing systems correctly define the Year 2000. CMAC's information systems
will be used for Radian's operations.
 
     With respect to CMAC's non-information technology systems, CMAC has made
reasonable efforts to contact providers of products and services with
non-information technology concerning their Year 2000 readiness. Discussions
with suppliers of electronic and electro-mechanical devices deemed critical to
CMAC's business operations are ongoing. Based on this contact and discussion,
CMAC believes that it does not have material exposure to the Year 2000 issue
with respect to its non-information systems.
 
     We continue to analyze whether others with whom we do business have Year
2000 issues. These include lenders and the custodian of our investment accounts.
We are currently unable to predict the extent to which the Year 2000 issue will
affect these persons, or the extent to which Radian would be vulnerable to their
failure to remediate any Year 2000 issues on a timely basis. The failure of any
one of these persons subject to the Year 2000 issue to convert its systems on a
timely basis or a conversion that is incompatible with Radian's systems could
have a material adverse effect on our business and financial performance.
 
     Radian intends to actively work with and encourage others with whom it does
business to minimize the risks of business disruptions resulting from Year 2000
issues and develop contingency plans where necessary. CMAC has already developed
such contingency plans, which Radian would expect to implement if necessary
after the merger. Under such contingency plans:
 
- - Radian would accept electronic mortgage insurance applications from
  originators of mortgage loans;
 
- - Radian would use "widowing" logic to process dates correctly;
 
- - Radian would encourage customers to order mortgage insurance directly via the
  Internet through its MI Online product;
 
- - Radian would accept paper or fax applications or other submissions from its
  lenders;
 
- - Radian's servicers would effect servicing functions via the Internet using its
  ServiceLink system;
 
- - Radian would defer renewal billing of its policyholders to a mutually agreed
  upon date; and
 
- - Radian would suspend automatic cancellation for non-payment.
 
The costs incurred by Amerin during the year ended December 31, 1998 to address
Year 2000 compliance were approximately $400,000. CMAC did not incur any
significant incremental expenses during this same period. Together, we expect to
expend $500,000 in 1999 to support Year 2000 compliance initiatives. CMAC has
not used any independent verification and validation processes to assure the
reliability of its risk and cost estimates.
 
A THIRD-PARTY ACQUISITION OF RADIAN MAY BE DIFFICULT, EVEN IF IT MAY BE
BENEFICIAL TO RADIAN'S STOCKHOLDERS.
 
     The anti-takeover provisions of Delaware law could make it more difficult
for a third party to acquire control of Radian, even if a change in control
would be beneficial to stockholders. Radian's certificate of
 
RISK FACTORS
                                       16
<PAGE>   21
 
incorporation will provide that its board of directors may issue preferred stock
without stockholder approval. Radian's certificate of incorporation will also
provide for a classified board, with each board member serving a staggered three
year term. In addition, Radian will keep in place a "poison pill" stockholders'
rights plan that will trigger a dilutive issuance of common stock upon
substantial purchases of Radian common stock by a third party. The issuance of
preferred stock, the existence of a classified board and the rights plan could
make it more difficult for a third party to acquire Radian.
 
                                                                    RISK FACTORS
                                       17
<PAGE>   22
 
                        CAUTIONARY STATEMENT CONCERNING
              FORWARD-LOOKING STATEMENTS AND PRO FORMA INFORMATION
 
     We have made forward-looking statements in this document that are subject
to risks and uncertainties. Forward-looking statements include the information
concerning possible or assumed future results of operations of our companies set
forth in this joint proxy statement/prospectus and those preceded by, followed
by or that include the words "believes," "expects," "anticipates" or similar
expressions. For those statements, we claim the protection of the safe harbor
for forward-looking statements contained in the Private Securities Litigation
Reform Act of 1995. You should understand that the following important factors,
in addition to those discussed elsewhere in this document, could affect the
future results of CMAC, Amerin and Radian, and could cause those results to
differ materially from those expressed in our forward-looking statements:
 
- - the risk that housing demand may decrease as a result of higher-than-expected
  interest rates, adverse economic conditions or other reasons;
 
- - that seasonality may be different than the historical pattern;
 
- - that the market share of the segment of the mortgage market served by the
  mortgage insurance industry may decline as a result of competition from
  government programs or other substitute products; and
 
- - that Radian's share of originations having private mortgage insurance may
  decline as a result of competition or other factors.
 
     Any numerical or financial information in this document relating to Radian
reflects the combined results of Amerin and CMAC as of and for the year ended
December 31, 1998. This presentation is intended to provide a picture of what
our businesses might have looked like had they always been combined. However,
the companies may have performed differently if they had actually been combined.
You should not rely on the pro forma information set forth in this document as
being indicative of the historical results that we would have had or the future
results or business that we will experience after the merger.
 
CAUTIONARY STATEMENT
                                       18
<PAGE>   23
 
                                   THE MERGER
 
BACKGROUND OF THE MERGER
 
     Both of our companies provide private mortgage insurance. The private
mortgage insurance industry is both highly dynamic and intensely competitive,
with competition coming from several sources: private mortgage insurers,
government and quasi-governmental entities and major lending institutions. Both
companies have been engaged in strategic planning in the face of the competitive
pressures in the industry.
 
     By late 1996, our companies had each independently recognized that a
combination with one or more similarly situated companies would be an effective
means of achieving the operating efficiency, scale, scope and financial
resources necessary to compete effectively.
 
     In October 1996, Frank Filipps, president and chief executive officer of
CMAC, met with Gerald Friedman, chairman and chief executive officer of Amerin,
at Mr. Filipps' request. They discussed whether it would be worthwhile to see if
our companies might have an interest in a business combination. This initial
discussion was very preliminary and no meaningful discussions resulted from this
meeting.
 
     In March 1997, Mr. Filipps and Mr. Friedman met to discuss the direction
and philosophy of each company and the compatibility of our business and
long-term strategic objectives. In the following months, several conversations
took place between our financial advisors relating to a potential combination,
but no specific terms were agreed upon.
 
     In July 1997, Mr. Filipps and Mr. Friedman spoke and met on several
occasions. As a result of these discussions they decided to explore a potential
business combination. We signed a joint confidentiality agreement on July 29,
1997. During the following month, we held meetings between members of our
respective senior management teams and our advisors. They discussed the ways in
which a possible combination would be structured, the benefits that could be
derived from such a combination and the issues that had to be resolved before
any definitive agreement could be reached.
 
     By late August 1997, we determined that no consensus could be reached on
the structure of the combined company, the business plans and objectives, the
governance arrangements and the relative valuation of our businesses. On
September 9, 1997, Amerin sent CMAC a letter terminating all further
discussions.
 
     In spring 1998, Amerin retained Donaldson, Lufkin & Jenrette Securities
Corporation as its financial advisor in connection with any discussions with
CMAC and any other strategic transactions that might take place.
 
     In July 1998, Mr. Filipps and Mr. Friedman discussed whether we had a
common basis to start discussions on a possible business combination. They
determined that the ratio of the stock prices of the two companies was at a
point where they could begin discussions to negotiate an exchange ratio. They
agreed to meet further to start a discussion of valuation and transaction terms.
 
     In August 1998, representatives of our companies and our financial advisors
met to discuss whether it would be feasible to negotiate a business combination
at that time and whether we had an interest in doing so. We were unable to agree
on any transaction terms or valuation at that meeting. In addition, recent
volatility in the market had pushed the stock prices of our companies downwards
and the stock price of CMAC down relative to the stock price of Amerin. As a
result, CMAC would not agree at that time to an exchange ratio that Amerin
considered adequate in light of Amerin's pro forma contribution to the financial
performance of a combined CMAC/Amerin. We determined, therefore, not to enter
into merger negotiations.
 
     No substantial communications between us or our respective advisors
occurred from August 1998 until the first week of November 1998.
 
                                                                      THE MERGER
                                       19
<PAGE>   24
 
     During fall 1998, representatives of DLJ contacted a number of companies to
determine whether they had any interest in a business combination with Amerin.
Only one of the parties contacted by DLJ indicated interest in pursuing a
business combination with Amerin. In September 1998, Amerin and DLJ had
conversations with this company concerning an all-cash acquisition of Amerin at
a price in the $19-$22 per share range. These conversations terminated when the
company refused to increase its proposed purchase price, a price that Amerin and
DLJ considered inadequate for an acquisition transaction that would preclude
Amerin stockholders from participating in the future upside of the combined
company's stock.
 
     By late October 1998, our stock prices had returned to a ratio comparable
to where they had traded before August 1998 when our discussions terminated.
Representatives of Schroder & Co. Inc., on CMAC's behalf, and DLJ arranged a
meeting on November 3, 1998 to determine whether we had any interest in
commencing negotiations and discussions for a possible transaction.
 
     On November 3, 1998, representatives of our companies and our respective
financial advisors met to discuss a possible business combination and the key
issues to be addressed. During the negotiations we had extensive discussions on
the issues that had caused us to terminate the 1997 discussions. Based on the
outcome of the meeting, we decided to begin formal negotiations on a proposed
merger transaction.
 
     On November 9, 1998, we met in New York with our legal and financial
advisors to commence the due diligence process and to determine the timing and
organization of the negotiations. Over the next two weeks, negotiations and due
diligence continued in an attempt to quantify the benefits that a combination of
our two companies would provide as well as to reassess the various issues that
such a combination might pose. Selected members of both the Amerin and CMAC
boards of directors were briefed on developments between the two companies as
these developments occurred.
 
     On November 19, 1998, a meeting of the Amerin board of directors was held.
At this meeting, the Amerin board received a status report on the continuing
discussions with CMAC. Management reviewed with the board the recent and the
projected financial and operating results of Amerin and described its view of
the overall state of the mortgage industry. Amerin management indicated that
there were signs of increasing competition and that Amerin foresaw increasing
margin pressure from lenders on key Amerin product lines. DLJ reviewed for the
board all of its and management's efforts to pursue with other parties the
concept of a strategic partnership or other transaction with Amerin. DLJ also
reviewed the financial terms of the proposed merger as then under discussion
with CMAC and presented its views as to the benefits of the proposed
transaction.
 
     On November 19, 1998, a meeting of the CMAC board was also held. CMAC
management reported on the strategic aspects of the proposed combination, the
status of negotiations, the results of due diligence investigations and the
proposed resolution of governance, management, employee benefit and valuation
issues. At the meeting, Schroders described the analyses it had undertaken and
would finalize in connection with delivering a fairness opinion with respect to
the proposed combination including the pro forma merger analysis, the stock
price and exchange ratio analysis, the selected companies analysis, the selected
merger of equals transaction analysis, the selected insurance acquisition
analysis and the relative contribution analysis. Deloitte & Touche LLP reported
on the applicability of the pooling of interests method of accounting for the
proposed combination.
 
     On November 22, 1998, each of our boards met separately to review the final
terms of the merger that were presented by our respective managements. After the
delivery by DLJ of its fairness opinion, the Amerin board unanimously approved
the merger agreement. After the delivery by Schroders of its fairness opinion,
the CMAC board unanimously approved the merger agreement. Each of our boards
voted to recommend the approval and adoption of the merger agreement to its
stockholders. See "Opinions of Financial Advisors."
 
     Our companies signed the merger agreement late on November 22, 1998 and
publicly announced the merger on November 23, 1998.
 
THE MERGER
                                       20
<PAGE>   25
 
CMAC'S REASONS FOR THE MERGER; RECOMMENDATION OF THE CMAC BOARD
 
     THE CMAC BOARD UNANIMOUSLY DETERMINED THAT THE TERMS OF THE MERGER ARE FAIR
TO, AND IN THE BEST INTEREST OF, CMAC AND ITS STOCKHOLDERS. ACCORDINGLY, THE
CMAC BOARD RECOMMENDS THAT THE STOCKHOLDERS OF CMAC VOTE FOR APPROVAL AND
ADOPTION OF THE MERGER PROPOSAL.
 
     The CMAC board believes that:
 
     -  the merger presents an opportunity to create a premier mortgage 
        insurance company;
 
     -  Radian will be better positioned to compete in the mortgage insurance
        industry through greater capital and marketing resources;
 
     -  the opportunities that the merger presents to CMAC and its stockholders
        exceed those available to CMAC on its own.
 
     In reaching its determination to recommend approval of the merger, the CMAC
board considered a number of factors including, without limitation, the
following:
 
     -  the complementary marketing strategies and customer bases of Amerin and
        CMAC;
 
     -  the combined company will have the scale and efficiencies necessary to
        compete effectively in the mortgage industry;
 
     -  the strength and depth of the combined management teams;
 
     -  management's expectation that the merger will be accretive to operating
        earnings after the first full quarter of combined operations;
 
     -  that the combined company initially will have:
 
[ARROW] assets of approximately $1.3 billion;
 
[ARROW] capital of approximately $900 million;
 
[ARROW] market capitalization of approximately $1.5 billion based on the closing
        price of CMAC common stock and Amerin common stock on November 20, 1998;
        and
 
[ARROW] insurance in force of approximately $78.0 billion;
 
     -  the opportunity to obtain cost efficiencies and operating synergies;
 
     -  that the combined company will serve over 3,500 clients, including a
       majority of the top 30 lenders; and
 
     -  that the merger will bring together two of the fastest growing companies
        within the mortgage insurance industry.
 
     The CMAC board also considered:
 
     -  presentations from, and discussions with, CMAC's senior management,
        representatives of its outside legal counsel and its independent
        accounting firm, and representatives of Schroders regarding the due
        diligence they performed with respect to Amerin;
 
     -  current industry, economic and market conditions, including the 
        increased competition in the mortgage insurance industry;
 
     -  that the combined company's claims-paying ability has been confirmed by
        S&P;
 
     -  that the combined company's financial strength has been confirmed by
        Moody's;
 
     -  based on management's understanding, that the merger should be accounted
        for as a pooling of interests under GAAP after discussions with CMAC's
        independent accountants;
 
                                                                      THE MERGER
                                       21
<PAGE>   26
 
     - the competitive importance of market position, size and adequacy of
       financial resources in the mortgage insurance industry;
 
     - that the merger would qualify as a tax-free reorganization;
 
     - the ability of CMAC to achieve meaningful cost savings and efficiencies
       on its own;
 
     - the terms and conditions of the merger agreement including the
       termination fee payable by either party;
 
     - the written opinion of Schroders dated November 22, 1998 to the effect
       that, as of that date, the exchange ratio in the merger was fair from a
       financial point of view to CMAC;
 
     - that the exchange ratio in the merger is fixed and will not be increased
       or decreased in the event that the price of Amerin common stock rises or
       falls at a greater rate than the price of CMAC common stock prior to
       closing;
 
     - the current and historical market prices of Amerin common stock and CMAC
       common stock; and
 
     - other strategic alternatives, such as expansion into related businesses.
 
     The CMAC board also weighed the opportunities and advantages listed above
against:
 
     - the risk that the merger would not be completed or that the benefits
       sought in the merger would not be obtained;
 
     - the effect of the public announcement of the merger on CMAC's customer
       relationships, operating results and on the trading price of Amerin
       common stock and CMAC common stock;
 
     - the risk of diverting management resources from other strategic
       opportunities and operational matters for an extended period of time; and
 
     - the substantial amount of management time and effort that would be
       required to complete the merger and integrate the operations of CMAC with
       Amerin.
 
     As a result of such considerations, the CMAC board determined that the
potential advantages of the merger outweighed the benefits of remaining as a
stand-alone company. The CMAC board believes that the combined company, rather
than CMAC alone, would have a far greater opportunity to compete successfully in
the increasingly competitive mortgage insurance industry.
 
     In view of the variety of factors considered in connection with its
evaluation of the merger, the CMAC board did not find it practicable to and did
not quantify or otherwise assign relative weights to the specific factors
considered in reaching its determination. In addition, individual members of the
CMAC board may have given different weights to different factors.
 
AMERIN'S REASONS FOR THE MERGER; RECOMMENDATION OF THE AMERIN BOARD
 
     THE AMERIN BOARD UNANIMOUSLY DETERMINED THAT THE TERMS OF THE MERGER ARE
FAIR TO, AND IN THE BEST INTEREST OF, AMERIN AND ITS STOCKHOLDERS. ACCORDINGLY,
THE AMERIN BOARD RECOMMENDS THAT THE STOCKHOLDERS OF AMERIN VOTE FOR APPROVAL
AND ADOPTION OF THE MERGER PROPOSAL.
 
     The Amerin board believes that:
 
     - the merger presents an opportunity to create a premier mortgage insurance
       company;
 
     - Radian will be better positioned to compete in the mortgage insurance
       industry through greater capital and marketing resources;
 
     - the opportunities that the merger presents to Amerin and its stockholders
       exceed those available to Amerin on its own.
 
THE MERGER
                                       22
<PAGE>   27
 
     In reaching its determination to recommend approval of the merger, the
Amerin board considered a number of factors including, without limitation, the
following:
 
     - the belief that the merger will create a premier mortgage insurance
       company that will be better positioned to compete effectively in the
       industry than would Amerin on its own;
 
     - the complementary marketing strategies and customer bases of Amerin and
       CMAC;
 
     - the belief that the combined company will benefit from the combined
       financial resources, including statutory capital and the combination of
       Amerin and CMAC management and personnel, and therefore will be better
       able to capitalize on growth opportunities in the industry that may
       arise;
 
     - that the combined companies should be able to realize significant expense
       savings;
 
     - that the merger will make Radian the second largest mortgage insurer,
       measured by market share, and therefore will help Amerin achieve its
       goals for strategic growth;
 
     - the belief that consolidation in the mortgage insurance industry is
       probable over the near term due to a need for scale and the efficiencies
       that it should permit and that, given the fact that there are few
       participants in the industry, Amerin and its stockholders would benefit
       most by having Amerin able to select its preferred merger partner rather
       than waiting, allowing CMAC and others to consolidate and being forced to
       consolidate with one or more companies that had been rejected as
       acquisition candidates by other acquirors;
 
     - that other potential merger partners with whom Amerin had spoken over the
       course of the past two years had either not expressed any serious
       interest in pursuing a merger transaction or had suggested merger terms
       that were less favorable to Amerin and its stockholders and the belief
       that it was unlikely that any other entity had interest in and the
       capability of making a superior merger proposal to Amerin;
 
     - that the merger agreement does not preclude Amerin from:
 
[ARROW] participating in negotiations with, and furnishing information to,
        persons or entities that seek to engage in discussions or negotiations,
        or that request information, in connection with a written proposal if
        the Amerin board determines in good faith, after taking into account its
        fiduciary duties, that such action is in the best interests of the
        Amerin stockholders; or
 
[ARROW] subject to paying a termination fee of $22 million to CMAC, terminating
        the merger agreement to accept a proposal if the Amerin board determines
        in good faith, after taking into account the advice of independent
        financial advisors and after taking into account the strategic benefits
        anticipated to be derived from the merger and the prospects of CMAC and
        Amerin as a combined company, that such proposal is more favorable over
        the longer term to Amerin and its stockholders than the merger and for
        which financing, to the extent required, is then fully committed or
        reasonably determined to be available by the Amerin board;
 
     - reports from management and legal advisors on the specific terms of the
       merger agreement and other matters, including the structuring of the
       merger to qualify as a tax-free reorganization such that Amerin
       stockholders will not have to pay tax with respect to the Radian common
       stock they receive in the merger except with respect to cash received for
       fractional shares;
 
     - information concerning the financial performance and condition, business
       operations, capital levels, asset quality and prospects of Amerin, and
       its projected future financial performance as a separate entity and on a
       combined basis;
 
     - current industry, economic and market conditions and trends, including
       the fact that the mortgage industry is becoming more competitive and is
       experiencing increasing margin pressures from lenders;
 
                                                                      THE MERGER
                                       23
<PAGE>   28
 
     - the exchange ratio in the merger is fixed and will not be reduced in the
       event the price of Amerin common stock decreases at a greater rate than
       CMAC common stock prior to closing;
 
     - the ability of CMAC and Amerin to account for the merger as a pooling of
       interests under GAAP;
 
     - the current and historical market prices of Amerin common stock and CMAC
       common stock;
 
     - the financial and other analyses presented by DLJ as to the fairness,
       from a financial point of view, of the exchange ratio in the merger to
       the Amerin stockholders;
 
     - the likelihood of obtaining the required regulatory approvals;
 
     - that Amerin's obligation to close the merger was conditioned on the
       execution by Roy J. Kasmar of an employment contract with CMAC, a
       condition that the Amerin board believed was necessary to reassure
       Amerin's sales team and customers (see "Interests of Certain Persons in
       the Merger -- Kasmar Employment Agreement");
 
     - the terms and conditions of the merger agreement, including the
       termination fee payable by either party; and
 
     - the impact of the merger on the customers and employees of Amerin.
 
     The Amerin board also weighed the opportunities and advantages listed above
against:
 
     - the risk that the benefits sought in the merger would not be obtained;
 
     - the risk that the merger would not be completed;
 
     - the effect of the public announcement of the merger on Amerin's customer
       relationships, operating results and on the trading price of Amerin
       common stock and CMAC common stock;
 
     - the risk that, prior to closing, the price of CMAC common stock would
       decrease at a rate greater than any decrease in the price of Amerin
       common stock and that the merger agreement does not provide for any
       adjustment of the exchange ratio;
 
     - the risk that another party might be willing to pay a higher price to
       Amerin's stockholders but would be dissuaded from doing so as a result of
       the $22 million termination fee provided for in the merger agreement; and
 
     - the potentially substantial management time and effort that will be
       required to complete the merger and integrate the operations of Amerin
       with CMAC.
 
     As a result of the foregoing considerations, the Amerin board determined
that the potential advantages of the merger outweighed the benefits of remaining
as a stand-alone company. The Amerin board believes that the combined company,
rather than Amerin alone, would have a far greater opportunity to compete
successfully in the increasingly competitive mortgage insurance industry.
 
     The foregoing discussion of the information and factors considered by the
Amerin board is not intended to be exhaustive but includes all material factors
considered. The Amerin board relied on the experience and expertise of its
financial advisors for quantitative analysis of the financial terms of the
merger. The Amerin board did not assign relative weights to the above factors.
Rather, it viewed its position and recommendation as being based on the totality
of the information presented and considered. In addition, individual members of
the Amerin board may have given different weights to different factors.
 
ACCOUNTING TREATMENT
 
     We expect to receive letters, dated the closing date, from our respective
independent accountants stating that it will be appropriate for us to use
pooling of interests accounting for the merger under Opinion No. 16, "Business
Combinations," of the Accounting Principles Board of the American Institute of
Certified Public Accountants. Under this accounting method, the assets and
liabilities of Amerin and
 
THE MERGER
                                       24
<PAGE>   29
 
CMAC will be carried forward to Radian at their historical recorded bases.
Results of operations of Radian will include the results of both CMAC and Amerin
for the entire fiscal year in which the merger occurs. The reported balance
sheet amounts and results of operations of the separate corporations for prior
periods will be combined, reclassified and conformed, as appropriate, to reflect
the combined financial position and results of operations for Radian. See
"Unaudited Pro Forma Combined Condensed Financial Statements."
 
FEDERAL INCOME TAX CONSEQUENCES
 
     The following discussion summarizes the opinions of Davis Polk & Wardwell
and Morgan, Lewis & Bockius LLP as to the material United States federal income
tax consequences of the merger and is based on the Internal Revenue Code of
1986, as amended, and related regulations, administrative interpretations and
court decisions, all as in effect as of the date of this joint proxy
statement/prospectus. Future legislation, regulations, administrative
interpretations and court decisions could significantly change such authorities
either prospectively or retroactively.
 
     This discussion does not address all aspects of United States federal
income taxation that may be important to a stockholder in light of such
stockholder's particular circumstances or to a stockholder subject to special
rules, such as:
 
     - a stockholder that is not a citizen or resident of the United States,
 
     - a financial institution,
 
     - a tax-exempt organization,
 
     - an insurance company,
 
     - a dealer or broker in securities,
 
     - a stockholder that held its stock as part of a hedge, appreciated
       financial position, straddle or conversion transaction, or
 
     - a person who acquired his or her Amerin common stock by exercising
       employee options or received Amerin common stock otherwise as
       compensation.
 
     CMAC has received an opinion of Morgan Lewis & Bockius LLP, and Amerin has
received an opinion of Davis Polk & Wardwell, each dated as of the date of this
joint proxy statement/prospectus. Such tax counsel will confirm their respective
opinions as of the closing date of the merger, provided that:
 
     - no change in law between the date of this joint proxy
       statement/prospectus and such closing date shall have occurred,
 
     - confirmation of assumptions, representations and covenants, including
       those contained in certificates of officers of CMAC and Amerin, shall
       have been received as of the closing date, and
 
     - the merger shall be completed in the manner contemplated by the merger
       agreement.
 
It is a condition to the merger that CMAC and Amerin receive an opinion of the
relevant tax counsel dated as of the closing date of the merger and that tax
counsel confirm their respective opinions as of that date. Neither CMAC nor
Amerin currently intends to waive this condition. If either CMAC or Amerin
waives this condition because the merger is likely to be a taxable transaction,
it will recirculate this joint proxy statement/prospectus to disclose the waiver
and all related material disclosures, including the risks to its stockholders
resulting from the waiver, and will resolicit proxies from its stockholders.
Neither CMAC nor Amerin intends to secure a ruling from the IRS with respect to
the tax consequences of the merger.
 
     The discussion of material federal income tax consequences generally
applicable to Amerin stockholders who exchange their Amerin common stock for
Radian common stock in the merger
 
                                                                      THE MERGER
                                       25
<PAGE>   30
 
represents the opinion of Davis Polk & Wardwell, and the discussion of material
federal income tax consequences generally applicable to CMAC stockholders
represents the opinion of Morgan, Lewis & Bockius LLP.
 
     The opinions of tax counsel assume completion of the merger in the manner
contemplated by the merger agreement and the absence of changes in existing law,
and rely on assumptions, representations and covenants including those contained
in certificates of officers of CMAC and Amerin. Their opinions neither bind nor
preclude the IRS from adopting a contrary position. An opinion of counsel sets
forth such counsel's legal judgment and has no binding effect or official status
of any kind. We cannot assure you that contrary positions will not be
successfully asserted by the IRS or adopted by a court if the issues are
litigated.
 
     Federal Income Tax Treatment of the Merger.  The merger will be treated for
United States federal income tax purposes as a reorganization within the meaning
of Section 368(a) of the Internal Revenue Code, and Amerin and CMAC will each be
a party to such reorganization within the meaning of Section 368(b) of the
Internal Revenue Code.
 
     Federal Income Tax Consequences to Holders of Amerin Common Stock.  No gain
or loss will be recognized for United States federal income tax purposes by
Amerin stockholders who exchange their Amerin common stock solely for Radian
common stock in the merger, except with respect to cash received for fractional
shares. The aggregate tax basis of Radian common stock received as a result of
the merger will be the same as the stockholder's aggregate tax basis in the
Amerin common stock surrendered in the exchange, reduced by any such tax basis
allocable to fractional shares of Radian common stock for which cash is
received. The holding period of the Radian common stock held by former Amerin
stockholders as a result of the exchange will include the period during which
such stockholder held the Amerin common stock exchanged. A holder of Amerin
common stock who receives cash instead of a fractional share of Radian common
stock will recognize gain or loss for United States federal income tax purposes,
measured by the difference between the amount of cash received and the portion
of the tax basis of the Amerin common stock allocable to such fractional share.
Any such gain or loss generally will be capital gain or loss if such Amerin
common stock has been held as a capital asset, and will be long-term capital
gain or loss if such Amerin common stock has been held for more than one year as
of the closing date of the merger.
 
     Federal Income Tax Consequences to Holders of CMAC Common Stock.  Holders
of CMAC common stock will not recognize gain or loss for United States federal
income tax purposes as a result of the merger.
 
     Reporting Requirements and Other Matters.  Each stockholder of Amerin
receiving Radian common stock as a result of the merger will be required to
retain records related to such stockholder's Amerin common stock and file with
its United States federal income tax return a statement setting forth facts
relating to the merger.
 
     Holders of Amerin common stock should consult their own tax advisors as to
the United States federal income tax consequences of the ownership and
disposition of the Radian common stock received in the merger.
 
     THE DISCUSSION SET FORTH ABOVE OF MATERIAL UNITED STATES FEDERAL INCOME TAX
CONSEQUENCES IS INTENDED TO PROVIDE ONLY A GENERAL SUMMARY, AND IS NOT INTENDED
TO BE A COMPLETE ANALYSIS OR DESCRIPTION OF ALL POTENTIAL UNITED STATES FEDERAL
INCOME TAX CONSEQUENCES OF THE MERGER. IN ADDITION, THE FOREGOING DISCUSSION
DOES NOT ADDRESS TAX CONSEQUENCES WHICH MAY VARY WITH, OR ARE CONTINGENT ON,
INDIVIDUAL CIRCUMSTANCES. MOREOVER, THIS DISCUSSION DOES NOT ADDRESS ANY
NON-INCOME TAX OR ANY FOREIGN, STATE OR LOCAL TAX CONSEQUENCES OF THE MERGER.
THIS DISCUSSION DOES NOT ADDRESS THE TAX CONSEQUENCES OF ANY TRANSACTION OTHER
THAN THE MERGER. ACCORDINGLY, EACH STOCKHOLDER IS STRONGLY URGED TO CONSULT WITH
SUCH HOLDER'S TAX ADVISOR TO DETERMINE THE PARTICULAR UNITED STATES FEDERAL,
STATE, LOCAL OR FOREIGN INCOME OR OTHER TAX CONSEQUENCES OF THE MERGER TO SUCH
HOLDER.
 
THE MERGER
                                       26
<PAGE>   31
 
REGULATORY APPROVALS
 
     All material regulatory approvals necessary to permit CMAC and Amerin to
close the merger have already been obtained. On January 6, 1999, the Federal
Trade Commission granted early termination of the waiting period relating to the
merger under the Hart-Scott-Rodino Antitrust Improvements Act of 1976. On
February 4, 1999, the Illinois Department of Insurance approved the merger.
 
NO APPRAISAL RIGHTS
 
     Holders of Amerin common stock are not entitled to appraisal rights in
connection with the merger because Amerin common stock is designated as a
national market system security on an interdealer quotation system by the
National Association of Securities Dealers, Inc. and Amerin stockholders will
receive in exchange for their Amerin common stock shares of Radian, the
surviving corporation in the merger, and cash in lieu of fractional shares.
Holders of CMAC common stock are not entitled to appraisal rights in connection
with the merger because CMAC common stock is listed on a national securities
exchange.
 
                                                                      THE MERGER
                                       27
<PAGE>   32
 
          COMPARATIVE PER SHARE MARKET PRICE AND DIVIDEND INFORMATION
 
     CMAC common stock is listed on the New York Stock Exchange. Amerin common
stock is listed on The Nasdaq National Market. The CMAC ticker symbol on the
NYSE is "CMT". The Amerin ticker symbol on Nasdaq is "AMRN".
 
     The tables below set forth, for the calendar quarters indicated, the
reported high and low sale prices of CMAC common stock and Amerin common stock
as reported on the NYSE Composite Transaction Tape and on Nasdaq, respectively,
and the cash dividends paid or declared per share for each for the periods
presented, based on published financial sources.
 
<TABLE>
<CAPTION>
                                                                                Amerin Common
                                                    CMAC Common Stock               Stock
                                              -----------------------------    ---------------
                                               MARKET PRICE          CASH       MARKET PRICE
                                              ---------------      DIVIDEND    ---------------
                                              HIGH       LOW       DECLARED    HIGH       LOW
                                              ----      -----      --------    ----      -----
<S>                                           <C>       <C>        <C>         <C>       <C>
1997
  First Quarter                               $37 3/8    $32 3/8    $ .03      $26 1/8    $19 7/8
  Second Quarter                               47 7/8     33 1/4      .03       24 7/8     17 3/4
  Third Quarter                                55         44 1/16     .03       28 3/4     22 5/8
  Fourth Quarter                               60 13/16   50 13/16    .03       32 5/8     22 1/4
1998
  First Quarter                               $69 1/4    $55 15/16  $ .03      $30 1/8    $26 1/4
  Second Quarter                               67 1/4     57 1/16     .03       33 11/16   27 5/8
  Third Quarter                                68 11/16   36 5/8      .03       31 3/8     18 7/8
  Fourth Quarter                               48 13/16   28          .03       25 1/8     13 13/16
1999
  First Quarter                               $51        $35        $ .03      $26 1/2    $18 1/8
  Second Quarter (through May 5, 1999)         45 7/8     33 5/16      --       23 5/8     17 5/8
</TABLE>
 
     Amerin has never declared or paid any cash dividends on shares of Amerin
common stock. The merger agreement provides that, without the prior consent of
the other party, CMAC may not pay dividends on CMAC common stock, except for
regular quarterly cash dividends of $.03 per share, and Amerin may not pay any
dividends on Amerin common stock.
 
     On November 20, 1998, the last full trading day prior to the public
announcement of the proposed merger, the closing price was $43.938 per share of
CMAC common stock on the NYSE and $20.875 per share of Amerin common stock on
Nasdaq. On May 5, 1999, the most recent practicable date prior to the printing
of this joint proxy statement/prospectus, the closing price was $44.0625 per
share of CMAC common stock on the NYSE and $22.625 per share of Amerin common
stock on Nasdaq. WE URGE YOU TO OBTAIN CURRENT MARKET QUOTATIONS PRIOR TO MAKING
ANY DECISION WITH RESPECT TO THE MERGER.
 
COMPARATIVE PER SHARE INFORMATION
                                       28
<PAGE>   33
 
          UNAUDITED PRO FORMA COMBINED CONDENSED FINANCIAL STATEMENTS
 
     The following unaudited pro forma combined condensed financial statements
give effect to the merger using the pooling of interests method of accounting,
after giving effect to the pro forma adjustments described in the accompanying
notes. These unaudited pro forma combined condensed financial statements have
been prepared from, and should be read in conjunction with, the historical
consolidated financial statements and notes thereto of CMAC and Amerin, which
are incorporated by reference in this joint proxy statement/prospectus.
 
     The unaudited pro forma information is presented for illustrative purposes
only. This information is not necessarily indicative of the operating results or
financial position that would have occurred had the merger occurred on the dates
indicated, nor is it necessarily indicative of future operating results or
financial position of the merged companies.
 
     The unaudited Pro Forma Combined Condensed Balance Sheet gives effect to
the merger as if it had occurred on December 31, 1998, combining the balance
sheets of CMAC and Amerin at December 31, 1998. The unaudited Pro Forma Combined
Condensed Statements of Income give effect to the merger as if it had occurred
at the beginning of the earliest period presented, combining the results of CMAC
and Amerin for each year in the three-year period ended December 31, 1998.
 
     As a result of the merger, the merged companies will incur transition
costs, currently estimated at $37.5 million (pretax), in connection with
completing the transaction and integrating the operations of CMAC and Amerin.
The transition costs consist principally of:
 
     -  Professional Fees.
 
     -  Write-Offs of Unusable Assets. The unusable assets include:
 
[ARROW] Furniture and fixtures that will not be used by Radian (Estimated
        Charge -- $0.5 million)
 
[ARROW] Leasehold improvements that will not be of any benefit to Radian
        (Estimated Charge -- $2.0 million)
 
[ARROW] Computer equipment that will not be used by Radian (Estimated
        Charge -- $2.0 million)
 
[ARROW] Capitalized software that will not be used by Radian (Estimated
        Charge -- $8.0 million)
 
[ARROW] Goodwill that was put on the books at the time of Amerin's inception
        based on the excess cost over book value of mortgage insurance licenses.
        This remaining excess goodwill will not be of any value to Radian
        (Estimated Charge -- $2.0 million)
 
      These assets were fully utilized by Amerin as a stand-alone operating
      entity but the merged company will have no use for them due to the closing
      of Amerin's Chicago office and the expectation that Radian will use CMAC's
      operating system to service its system needs. As such, no write down or
      impairment was recorded by Amerin on a stand-alone basis. We do not
      anticipate holding assets for disposal, as Radian will write off unusable
      assets after the merger is completed, calculated based on the remaining
      net book value at the time of disposition. The method of disposition will
      primarily be abandonment, as the estimated salvage value of such unusable
      assets is expected to be insignificant. Any usable assets will be
      transferred to Philadelphia to be utilized in the new company. Those
      usable assets will be carried at amortized cost on the books of Radian.
      During the transition period after the merger is completed, some of these
      assets could be in use for a limited period.
 
     - Costs Associated With the Elimination and Consolidation of Duplicate
       Facilities.  We currently expect Radian to vacate Amerin's current
       corporate headquarters in Chicago, Illinois no sooner than 90 days after
       the merger. We currently expect Radian to vacate Amerin's West Chester,
       Illinois management of contract underwriting and claims facility
       approximately 6 to 9 months after
 
                                                  UNAUDITED PRO FORMA FINANCIALS
                                       29
<PAGE>   34
 
      the completion of the merger. Such assets will not be written off
      immediately, but will be amortized or depreciated over a revised estimated
      useful life.
 
      The following table represents the remaining estimated useful lives of the
      fixed assets that will be written off due to the merger (dollars in
      millions):
 
<TABLE>
<CAPTION>
                                               1999
                           ---------------------------------------------
                           2ND QTR.      3RD QTR.      4TH QTR.    TOTAL
                           --------      --------      --------    -----
<S>                        <C>           <C>           <C>         <C>
Furniture & Fixtures.....    $0.2          $0.3          $ --      $ 0.5
Leasehold Improvements...     0.8           1.2            --        2.0
Computer Equipment.......     0.8           1.2            --        2.0
Capitalized Software.....     3.2           4.8            --        8.0
Goodwill.................     2.0            --            --        2.0
                             ----          ----          ----      -----
                             $7.0          $7.5          $ --      $14.5
                             ====          ====          ====      =====
</TABLE>
 
     -  Employee Severance and Relocation Resulting from the Merger.  We
        currently expect that Radian will retain:
 
[ARROW] 6-8 members of Amerin's management;
 
[ARROW] 19 members of Amerin's sales and marketing staff; and
 
[ARROW] 6 members of Amerin's national account staff.
 
      All other Amerin employees and employee groups are expected to be
      terminated following completion of the merger. CMAC currently estimates
      that this will result in the termination of approximately 125 employees.
      Components of the related compensation costs are as follows:
 
[ARROW] Severance -- $8.8 million
 
[ARROW] Benefits -- $0.5 million
 
[ARROW] Other -- $0.7 million
 
     While the exact timing, nature and amount of these transition costs is
subject to change, Radian anticipates that it will record pretax charges of
approximately $37.5 million for the amount of these direct merger-related costs
over the periods in which the expenses are incurred. This period is not expected
to extend past one year. In management's opinion, we do not expect these
estimated merger related costs to materially differ from the final amounts. The
estimate is comprised of the following amounts:
 
<TABLE>
<CAPTION>
                                                 (DOLLARS IN MILLIONS)
<S>                                              <C>
Professional services..........................          $11.0
Compensation arrangements......................           10.0
Write-off of fixed and intangible assets.......           14.5
Other..........................................            2.0
                                                         -----
                                                         $37.5
                                                         =====
</TABLE>
 
     The unaudited pro forma combined condensed financial statements do not
reflect the transition costs described above or any additional unanticipated
transition costs to be incurred during 1999 or thereafter, nor do they reflect
any anticipated cost savings.
 
UNAUDITED PRO FORMA FINANCIALS
                                       30
<PAGE>   35
 
                               RADIAN GROUP INC.
 
                   PRO FORMA COMBINED CONDENSED BALANCE SHEET
                               DECEMBER 31, 1998
 
<TABLE>
<CAPTION>
                                                 HISTORICAL   HISTORICAL    PRO FORMA     PRO FORMA
                                                    CMAC        AMERIN     ADJUSTMENTS     COMBINED
                                                 ----------   ----------   -----------    ----------
                                                               (DOLLARS IN THOUSANDS)
<S>                                              <C>          <C>          <C>            <C>
ASSETS
  Investments..................................    736,310     $439,142       $  --       $1,175,452
  Cash.........................................      2,191        7,186          --            9,377
  Deferred policy acquisition costs............     32,144       16,839          --           48,983
  Prepaid federal income taxes.................    103,763       45,000          --          148,763
  Other assets.................................     93,765       37,065          --          130,830
                                                  --------     --------       -----       ----------
          TOTAL ASSETS.........................   $968,173     $545,232       $  --       $1,513,405
                                                  ========     ========       =====       ==========
LIABILITIES AND STOCKHOLDERS' EQUITY
Liabilities
  Unearned premiums............................   $ 49,424     $ 26,114       $  --       $   75,538
  Reserve for losses...........................    201,276       43,849          --          245,125
  Deferred federal income taxes................    112,055       54,221          --          166,276
  Other liabilities............................     42,449       11,818          --           54,267
                                                  --------     --------       -----       ----------
          Total liabilities....................    405,204      136,002          --          541,206
                                                  --------     --------       -----       ----------
  Redeemable preferred stock...................     40,000           --          --           40,000
                                                  --------     --------       -----       ----------
Common Stockholders' Equity
  Common stock.................................         23          266        (252)(1)           37
  Additional paid-in capital...................    185,219      321,811         252(1)       507,282
  Retained earnings............................    331,201       76,205          --          407,406
  Net unrealized gains on investments, net of
     tax.......................................      6,526       10,948          --           17,474
                                                  --------     --------       -----       ----------
          Total common stockholders' equity....    522,969      409,230          --          932,199
                                                  --------     --------       -----       ----------
          TOTAL LIABILITIES AND STOCKHOLDERS'
            EQUITY.............................   $968,173     $545,232       $  --       $1,513,405
                                                  ========     ========       =====       ==========
</TABLE>
 
                 See accompanying Notes to Unaudited Pro Forma
                    Combined Condensed Financial Statements.
                                                  UNAUDITED PRO FORMA FINANCIALS
                                       31
<PAGE>   36
 
                               RADIAN GROUP INC.
 
                PRO FORMA COMBINED CONDENSED STATEMENT OF INCOME
                      FOR THE YEAR ENDED DECEMBER 31, 1998
 
<TABLE>
<CAPTION>
                                                 HISTORICAL   HISTORICAL    PRO FORMA       PRO FORMA
                                                    CMAC        AMERIN     ADJUSTMENTS      COMBINED
                                                 ----------   ----------   -----------      ---------
                                                                                  (UNAUDITED)
                                                       (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
<S>                                              <C>          <C>          <C>              <C>
REVENUES
  Premiums earned..............................   $282,152     $123,100     $     --        $405,252
  Net investment income........................     38,550       21,312           --          59,862
  Other income.................................     12,264        1,515        4,694(2)       18,473
                                                  --------     --------     --------        --------
          Total revenues.......................    332,966      145,927        4,694         483,587
                                                  --------     --------     --------        --------
EXPENSES
  Provision for losses.........................    132,023       34,354           --         166,377
  Policy acquisition costs.....................     36,139       22,340           --          58,479
  Other operating expenses.....................     38,980       16,046        4,694(2)       59,720
  Merger expenses..............................         --        1,098           --           1,098
                                                  --------     --------     --------        --------
          Total expenses.......................    207,142       73,838        4,694         285,674
                                                  --------     --------     --------        --------
  Pretax income................................    125,824       72,089           --         197,913
  Provision for income taxes...................     34,770       20,906           --          55,676
                                                  --------     --------     --------        --------
          Net income...........................   $ 91,054     $ 51,183     $     --        $142,237
                                                  ========     ========     ========        ========
Net income per common share -- basic...........   $   3.87     $   1.94     $     --        $   3.78
                                                  ========     ========     ========        ========
Net income per common share -- diluted.........   $   3.72     $   1.92     $     --        $   3.67
                                                  ========     ========     ========        ========
Average number of common shares
  outstanding -- basic.........................     22,657       26,374      (12,309)(1)      36,722
                                                  ========     ========     ========        ========
Average number of common and common equivalent
  shares outstanding -- diluted................     23,574       26,702      (12,462)(1)      37,814
                                                  ========     ========     ========        ========
</TABLE>
 
             See accompanying Notes to Unaudited Pro Forma Combined
                        Condensed Financial Statements.
UNAUDITED PRO FORMA FINANCIALS
                                       32
<PAGE>   37
 
                               RADIAN GROUP INC.
 
                PRO FORMA COMBINED CONDENSED STATEMENT OF INCOME
                      FOR THE YEAR ENDED DECEMBER 31, 1997
 
<TABLE>
<CAPTION>
                                           HISTORICAL     HISTORICAL       PRO FORMA        PRO FORMA
                                              CMAC          AMERIN        ADJUSTMENTS       COMBINED
                                           ----------    -------------    -----------       ---------
                                                                                  (UNAUDITED)
                                                    (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
<S>                                        <C>           <C>              <C>               <C>
REVENUES
  Premiums earned........................  $ 237,710       $  92,329       $     --         $ 330,039
  Net investment income..................     33,787          18,607             --            52,394
  Other income...........................      5,813           1,167            568(2)          7,548
                                           ---------       ---------       --------         ---------
          Total revenues.................    277,310         112,103            568           389,981
                                           ---------       ---------       --------         ---------
EXPENSES
  Provision for losses...................    117,149          30,272             --           147,421
  Policy acquisition costs...............     31,287          10,520             --            41,807
  Other operating expenses...............     26,381          14,643            568(2)         41,592
                                           ---------       ---------       --------         ---------
          Total expenses.................    174,817          55,435            568           230,820
                                           ---------       ---------       --------         ---------
  Pretax income..........................    102,493          56,668             --           159,161
  Provision for income taxes.............     27,526          15,909             --            43,435
                                           ---------       ---------       --------         ---------
          Net income.....................  $  74,967       $  40,759       $     --         $ 115,726
                                           =========       =========       ========         =========
Net income per common share -- basic.....  $    3.19       $    1.56       $     --         $    3.09
                                           =========       =========       ========         =========
Net income per common share -- diluted...  $    3.06       $    1.54       $     --         $    2.99
                                           =========       =========       ========         =========
Average number of common shares
  outstanding -- basic...................     22,471          26,119        (12,190)(1)        36,400
                                           =========       =========       ========         =========
Average number of common and common
  equivalent shares
  outstanding -- diluted.................     23,416          26,483        (12,360)(1)        37,539
                                           =========       =========       ========         =========
</TABLE>
 
                 See accompanying Notes to Unaudited Pro Forma
                    Combined Condensed Financial Statements.
                                                  UNAUDITED PRO FORMA FINANCIALS
                                       33
<PAGE>   38
 
                               RADIAN GROUP INC.
 
                PRO FORMA COMBINED CONDENSED STATEMENT OF INCOME
                      FOR THE YEAR ENDED DECEMBER 31, 1996
 
<TABLE>
<CAPTION>
                                                HISTORICAL    HISTORICAL     PRO FORMA      PRO FORMA
                                                   CMAC         AMERIN      ADJUSTMENTS     COMBINED
                                                ----------    ----------    -----------     ---------
                                                                                   (UNAUDITED)
                                                      (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
<S>                                             <C>           <C>           <C>             <C>
REVENUES
  Premiums earned.............................   $187,921      $62,349        $    --       $250,270
  Net investment income.......................     30,011       16,871             --         46,882
  Other income................................      4,664          161              2(2)       4,827
                                                 --------      -------        -------       --------
          Total revenues......................    222,596       79,381              2        301,979
                                                 --------      -------        -------       --------
EXPENSES
  Provision for losses........................     91,894       20,681             --        112,575
  Policy acquisition costs....................     26,850        8,485             --         35,335
  Other operating expenses....................     21,277       10,623              2(2)      31,902
                                                 --------      -------        -------       --------
          Total expenses......................    140,021       39,789              2        179,812
                                                 --------      -------        -------       --------
  Pretax income...............................     82,575       39,592             --        122,167
  Provision for income taxes..................     20,354       11,363             --         31,717
                                                 --------      -------        -------       --------
          Net income..........................   $ 62,221      $28,229        $    --       $ 90,450
                                                 ========      =======        =======       ========
Net income per common share -- basic..........   $   2.64      $  1.08        $    --       $   2.41
                                                 ========      =======        =======       ========
Net income per common share -- diluted........   $   2.55      $  1.07        $    --       $   2.35
                                                 ========      =======        =======       ========
Average number of common shares outstanding --
  basic.......................................     22,340       26,038        (12,152)(1)     36,226
                                                 ========      =======        =======       ========
Average number of common and common equivalent
  shares outstanding -- diluted...............     23,110       26,351        (12,298)(1)     37,163
                                                 ========      =======        =======       ========
</TABLE>
 
                 See accompanying Notes to Unaudited Pro Forma
                    Combined Condensed Financial Statements.
UNAUDITED PRO FORMA FINANCIALS
                                       34
<PAGE>   39
 
      NOTES TO UNAUDITED PRO FORMA COMBINED CONDENSED FINANCIAL STATEMENTS
 
NOTE 1 -- EXCHANGE RATIO
 
     Under the merger agreement, each outstanding share of Amerin common stock
will be converted into 0.5333 shares of Radian common stock. This exchange ratio
was used in computing share and per share amounts in the accompanying unaudited
pro forma combined condensed financial statements.
 
NOTE 2 -- PRO FORMA ADJUSTMENTS
 
     A pro forma adjustment has been made to conform the presentation of
contract underwriting income earned by Amerin's financial services business from
Other operating expenses to Other income.
 
NOTE 3 -- MERGER-RELATED EXPENSES
 
     In connection with the merger, the companies expect to incur investment
banking, legal, accounting and other related transaction costs and fees.
Additionally, the companies expect to incur other merger-related costs
associated with the integration of the separate companies and institution of
efficiencies anticipated as a result of the merger. The merger-related expenses
will be charged to expense in the period in which the merger is consummated, or
in subsequent periods when incurred. See the items listed under "Unaudited Pro
Forma Combined Condensed Financial Statements" on pages 29 and 30 for
information related to merger-related transition costs and expenses.
 
                                                  UNAUDITED PRO FORMA FINANCIALS
                                       35
<PAGE>   40
 
                         OPINIONS OF FINANCIAL ADVISORS
 
OPINION OF AMERIN'S FINANCIAL ADVISOR
 
     Amerin requested DLJ, in its role as financial advisor to Amerin, to render
an opinion to the Amerin board as to the fairness from a financial point of view
to the stockholders of Amerin of the exchange ratio. On November 19, 1998, DLJ
indicated to the Amerin board that DLJ was prepared to deliver its opinion to
the effect that, as of such date, the exchange ratio was fair to the holders of
Amerin common stock from a financial point of view. On November 22, 1998, DLJ
delivered its oral opinion, which was subsequently confirmed in writing, to the
Amerin board that, as of such date, and based on and subject to the assumptions,
limitations and qualifications set forth in such opinion, the exchange ratio was
fair from a financial point of view to the stockholders of Amerin.
 
     THE FULL TEXT OF THE DLJ OPINION IS ATTACHED HERETO AS APPENDIX IV. THE
SUMMARY OF THE DLJ OPINION SET FORTH IN THIS JOINT PROXY STATEMENT/PROSPECTUS IS
QUALIFIED IN ITS ENTIRETY BY REFERENCE TO THE FULL TEXT OF THE DLJ OPINION.
AMERIN STOCKHOLDERS ARE URGED TO READ THE DLJ OPINION CAREFULLY AND IN ITS
ENTIRETY FOR THE PROCEDURES FOLLOWED, ASSUMPTIONS MADE, OTHER MATTERS CONSIDERED
AND LIMITS OF THE REVIEW BY DLJ IN CONNECTION WITH THE DLJ OPINION.
 
     The DLJ opinion was prepared for the Amerin board and was directed only to
the fairness from a financial point of view, as of the date thereof, of the
exchange ratio to the holders of Amerin common stock. The senior management
teams of CMAC and Amerin negotiated the exchange ratio. The DLJ opinion was
necessarily based on economic, market, financial and other conditions as they
existed on, and on the information made available to DLJ as of, the date of the
DLJ opinion. You should understand that, although subsequent developments may
affect the DLJ opinion, DLJ does not have any obligation to update, revise or
reaffirm the DLJ Opinion. DLJ expressed no opinion in the DLJ opinion as to the
prices at which Amerin common stock or CMAC common stock would actually trade at
any time. The DLJ opinion does not address the relative merits of the merger and
the other business strategies considered by the Amerin board nor does it address
the Amerin board's decision to proceed with the merger. The DLJ opinion does not
constitute a recommendation to any Amerin stockholder as to how such stockholder
should vote on the merger.
 
     In arriving at the DLJ opinion, DLJ reviewed the merger agreement. DLJ also
reviewed financial and other information that was publicly available or
furnished to DLJ by Amerin and CMAC, including information provided during
discussions with their respective managements. Included in the information
provided during discussions with the respective managements were financial
projections of Amerin for the five years ended December 31, 2002 prepared by the
management of Amerin and financial projections of CMAC for the three years ended
December 31, 2000 prepared by the management of CMAC. In addition, DLJ compared
financial and securities data of Amerin and CMAC with various other companies
whose securities are traded in public markets, reviewed the historical stock
prices and trading volumes of Amerin common stock and CMAC common stock, and
conducted such other financial studies, analyses and investigations DLJ deemed
appropriate for purposes of rendering the DLJ opinion. Amerin did not impose any
restrictions or limitations upon DLJ with respect to the investigations made or
the procedures followed by DLJ in rendering the DLJ opinion.
 
     In rendering the DLJ opinion, DLJ relied upon and assumed the accuracy and
completeness of all of the financial and other information that was available to
DLJ from public sources, that was provided to DLJ by Amerin and CMAC or their
respective representatives, or that was otherwise reviewed by DLJ. In
particular, DLJ relied upon the estimates of the managements of Amerin and CMAC
of the operating synergies achievable as a result of the merger. With respect to
the financial projections supplied to DLJ, DLJ assumed that they were reasonably
prepared on the basis reflecting the best currently available estimates and
judgments of the managements of Amerin and CMAC as to the future operating and
financial performance of Amerin and CMAC, respectively. DLJ did not assume any
responsibility for making an independent evaluation of any assets or liabilities
or for making any independent verification of
 
OPINIONS OF FINANCIAL ADVISORS
                                       36
<PAGE>   41
 
any of the information reviewed by DLJ. DLJ assumed that the merger will qualify
as a pooling of interests transaction under generally accepted accounting
principles and as a tax-free reorganization within the meaning of Section 368(a)
of the Internal Revenue Code.
 
     The following is a summary of the presentation made by DLJ to the Amerin
board at its November 19, 1998 meeting in connection with rendering the DLJ
opinion. Unless otherwise specified, synergies as referred to below, include
expense savings and revenue enhancements resulting from the merger, as estimated
by the managements of Amerin and CMAC, and assume $15 million of annual
synergies realized in pro forma 1998 and 1999 and $20 million for the years
thereafter.
 
     Exchange Ratio Analysis Based on Comparable Company Analysis.  DLJ compared
the exchange ratio to the range of exchange ratios implied by the relative
valuations of Amerin's and CMAC's stock based on the equity trading valuations
of other publicly traded mortgage insurance companies, including MGIC Investment
Corporation, The PMI Group, Inc. and Triad Guaranty, Inc., believed by DLJ to be
comparable. DLJ analyzed the equity value of each of such peer mortgage
insurance companies, using trading valuations as of November 17, 1998, measured
as a multiple of selected financial data, including earnings per share,
excluding after tax realized investment gains or losses, for the twelve month
period ended September 30, 1998, 1998 estimated earnings per share and 1999
estimated earnings per share. The 1998 and 1999 estimated earnings per share for
the peer mortgage insurance companies were based on First Call mean earnings per
share estimates. Based on this analysis, DLJ developed a range of valuation
multiples equal to nine to thirteen times future earnings. These valuation
multiples were then applied to respective managements" projected 1999 earnings
per share to determine the range of equity valuations of Amerin and CMAC. The
valuation ranges of Amerin and CMAC were compared to each other to develop a
range of exchange ratios. The analysis resulted in a range of exchange ratios of
0.3581 to 0.7471. This range of exchange ratios includes the exchange ratio for
the merger.
 
     Exchange Ratio Analysis Based on the Relative Contributions of Amerin and
CMAC.  DLJ compared the exchange ratio for the merger to the range of exchange
ratios implied by the relative contributions of Amerin and CMAC to the pro forma
combined company. In this analysis, DLJ examined the relative contributions of
Amerin and CMAC to the pro forma combined entity based on selected financial
data, assuming no synergies. The analysis was as of September 30, 1998 for
balance sheet items and for the twelve months ended September 30, 1998 for
income statement items. A summary of the relative contributions of Amerin to the
pro forma combined company and the corresponding implied exchange ratios is as
follows:
 
- - 33.3% of the pro forma primary insurance in force, implying an exchange ratio
  of 0.4387;
 
- - 35.3% of the pro forma combined total risk in force, implying an exchange
  ratio of 0.4795;
 
- - 37.0% of the pro forma total assets, implying an exchange ratio of 0.5166;
 
- - 44.4% of the pro forma shareholders' equity, implying an exchange ratio of
  0.7038;
 
- - 40.3% of the pro forma statutory capital, implying an exchange ratio of
  0.5933;
 
- - 38.7% of the pro forma new insurance written, implying an exchange ratio of
  0.5563;
 
- - 30.0% of the pro forma net premiums written, implying an exchange ratio of
  0.3788;
 
- - 35.6% of the pro forma investment income, implying an exchange ratio of
  0.4865;
 
- - 36.8% of the net operating income, implying an exchange ratio of 0.5138; and
 
- - 37.4% of the pro forma combined market capitalization implying an exchange
  ratio of 0.5260, based on November 17, 1998 market prices.
 
The analysis further produced the relative contribution by Amerin to the 1998,
1999 and 2000 projected earnings of the pro forma combined company, based on the
respective managements' projections, of 37.5%, 36.9% and 36.8%, respectively,
implying exchange ratios of 0.5277, 0.5144, and 0.5127, respectively. The
                                                  OPINIONS OF FINANCIAL ADVISORS
                                       37
<PAGE>   42
 
foregoing analysis indicated an overall average relative contribution of Amerin
to the pro forma combined company of 36.9%, implying an average exchange ratio
of 0.5155, which is below the exchange ratio for the merger. The range of
exchange ratios resulting from the contribution analysis includes the exchange
ratio for the merger. Based on the exchange ratio for the merger, and Amerin's
and CMAC's respective November 1, 1998 common stock closing prices, Amerin
stockholders will own in the aggregate 37.7% of the common stock of the combined
company.
 
     Exchange Ratio Analysis Based on the Relative Discounted Theoretical Future
Stock Prices of Amerin and CMAC.  DLJ compared the exchange ratio for the merger
to the range of exchange ratios implied by the relative discounted theoretical
future stock prices of Amerin and CMAC. Such analysis was not conducted to
project future stock prices, but rather was conducted only as a substitute
analysis to a discounted cash flow analysis because DLJ believes that a
discounted cash flow analysis is not a meaningful evaluation technique for
Amerin and CMAC. DLJ determined a range of theoretical future stock prices as of
December 31, 2002 for Amerin and CMAC based on a representative range of current
trading multiples of the peer mortgage insurance companies and the earnings
projections of the managements of Amerin and CMAC. The range of peer mortgage
insurance companies trading multiples utilized were nine to thirteen times
current earnings. DLJ estimated CMAC's 2002 earnings per share by applying First
Call's long-term growth rate (15.5%) to CMAC management's projected 2000
earnings per share. The estimated theoretical future stock prices were
discounted to the present by the respective estimated cost of equity capital of
Amerin and CMAC equal to 15.4% and 14.9%, respectively. The resulting range of
Amerin's and CMAC's discounted theoretical future stock prices were compared to
each other to develop a range of implied exchange ratios. The analysis resulted
in a range of implied exchange ratios of 0.4005 to 0.8356, which includes the
exchange ratio for the merger.
 
     Exchange Ratio Analysis Based on the Relative Discounted Theoretical Future
Stock Prices of Amerin and the Pro Forma Combined Company.  DLJ compared the
exchange ratio for the merger to the range of exchange ratios implied by the
relative discounted theoretical future stock prices of Amerin and the pro forma
combined company. Such analysis was not conducted to project future stock
prices, but rather was conducted only as a substitute analysis to discounted
cash flow analysis because DLJ believes that a discounted cash flow analysis
generally is not a meaningful evaluation technique for insurance companies. DLJ
determined a range of theoretical future stock prices as of December 31, 2002
for Amerin and the pro forma combined company based on a representative range of
trading multiples of the peer mortgage insurance companies and the earnings
projections of the management of Amerin. Earnings for 2002, however, were
assumed to be equal to earnings for 2001, instead of using management's actual
2002 earnings forecasts, and the pro forma combined company. DLJ estimated the
combined company's pro forma 2002 earnings per share by combining Amerin's,
except as noted above, and CMAC's projected 2002 earnings per share and applying
the assumed expense synergies. DLJ estimated CMAC's 2002 earnings per share by
applying First Call's long-term growth rate (15.5%) to CMAC management's
projected 2000 earnings per share. The estimated theoretical future stock prices
were discounted to the present by the respective estimated cost of equity
capital of Amerin and the pro forma combined company equal to 15.4% and 15.1%,
respectively. The cost of equity capital of the pro forma combined company was
estimated to be equal to the equity value based weighted average of Amerin's and
CMAC's cost of equity capital. The resulting range of Amerin's and the pro forma
combined company's theoretical discounted future stock prices were compared to
each other to develop a range of implied exchange ratios. The analysis resulted
in a range of implied exchange ratios of 0.3482 to 0.7265, which includes the
exchange ratio for the merger.
 
     Exchange Ratio Analysis Based on the Historical Stock Trading Relationship
of Amerin and CMAC. DLJ compared the exchange ratio for the merger to the range
of implied exchange ratios resulting from Amerin's and CMAC's historical stock
trading prices. DLJ examined the history of the trading prices and their
relative relationships or exchange ratios for both Amerin and CMAC for the
twelve months ended November 17, 1998 and for the approximately three-year
period since Amerin's initial public offering on November 22, 1995. The relative
relationships of Amerin and CMAC stock prices during the first period
 
OPINIONS OF FINANCIAL ADVISORS
                                       38
<PAGE>   43
 
examined resulted in a range of implied exchange ratios of 0.4030 to 0.6719,
with an average exchange ratio of 0.4794, while the relative common stock
relationships during the second period examined resulted in a range of implied
exchange ratios equal to 0.4030 to 1.2159, with an average exchange ratio of
0.5796. Both periods examined resulted in a range of implied exchange ratios
that includes the exchange ratio for the merger.
 
     Pro Forma Financial Analysis.  DLJ analyzed the pro forma financial effects
resulting from the merger. In conducting its analysis, DLJ relied upon financial
projections provided by the managements of Amerin and CMAC. DLJ analyzed the pro
forma effect of the merger on the earnings per share, stockholders' equity per
share, dividend yield and ownership of the pro forma combined company. Amerin's
and CMAC's managements have indicated that they believe that the merger will
offer consolidated opportunities which will result in the synergies described
above. DLJ incorporated estimates of such synergies provided by the managements
of Amerin and CMAC in its analysis, although DLJ did not express any opinion as
to the likelihood of such synergies being realized. The results of the pro forma
merger analysis are not necessarily indicative of future operating results or
financial position. DLJ compared the projected earnings per share, book value
per share and dividend per share of Amerin and CMAC on a stand-alone basis to
Amerin and CMAC shareholders' projected pro forma earnings per share, book value
per share and dividend yield of the pro forma combined company. The analysis
estimates that the earnings per share to each Amerin shareholder is 7.4%, 8.1%
and 9.5% accretive in pro forma 1998, 1999 and 2000, respectively, while the
earnings per share to each CMAC shareholder is 6.6%, 4.9% and 6.0% accretive in
pro forma 1998, 1999 and 2000. The analysis also estimates that the book value
per share to each Amerin shareholder will be 14.8% dilutive as of December 31,
1998, while the book value per share to each CMAC stockholder will be 9.0%
accretive as of December 31, 1998. On a pro forma basis, each Amerin shareholder
will receive a dividend equal to approximately six cents per share.
 
     The chart below summarizes the resulting ranges of implied exchange ratios
based on DLJ's analysis. For a detailed description of each of DLJ's analyses
see the analyses discussed above.
 
<TABLE>
<CAPTION>
PUBLIC|COMPARABLES|ANALYSIS                                                0.3581                             0.7471
- ---------------------------                                                ------                             ------
<S>                                                           <C>                                <C>
Relative|Contribution|Analysis                                             0.3778                             0.7038
Discounted Future|Stock Price|Amerin/CMAC                                  0.4005                             0.8356
Discounted Future|Stock Price|Amerin/Combined                              0.3482                             0.7265
Historical Stock|Trading Relationship|11/13/97-11/17/98                    0.4030                             0.6719
Historical Stock Trading|Relationship|11/22/95-11/17/98                    0.4030                             1.2159
</TABLE>
 
     The summary set forth above is not intended to be a complete description of
the analyses performed by DLJ but describes, in summary form, the material
elements of the presentation made by DLJ to the Amerin board on November 19,
1998 in connection with preparation of the DLJ opinion. The preparation of a
fairness opinion involves various determinations as to the most appropriate and
relevant methods of financial analysis and the application of these methods to
the particular circumstances and, therefore, such an opinion is not readily
susceptible to summary description. Each of the analyses conducted by DLJ was
carried out in order to provide a different perspective on the transaction and
to add to the total mix of information available. DLJ did not form a conclusion
as to whether any individual analysis, considered in
 
                                                  OPINIONS OF FINANCIAL ADVISORS
                                       39
<PAGE>   44
 
isolation, supported or failed to support an opinion as to fairness from a
financial point of view. Rather, in reaching its conclusion, DLJ considered the
results of the analyses in light of each other and ultimately reached its
opinion based on the results of all analyses taken as a whole. DLJ did not place
particular reliance or weight on any individual analysis, but instead concluded
that its analyses, taken as a whole, supported its determination. Accordingly,
notwithstanding the separate factors summarized above, DLJ has indicated to
Amerin that it believes that its analyses must be considered as a whole and that
selecting portions of its analyses and the factors considered by it, without
considering all analyses and factors, could create an incomplete view of the
evaluation process underlying its opinion. The analyses performed by DLJ are not
necessarily indicative of actual values or future results, which may be
significantly more or less favorable than suggested by such analyses.
 
     Under the terms of an engagement agreement dated October 13, 1998 between
Amerin and DLJ, Amerin has paid DLJ a fee of $750,000 and, upon completion of
the merger, will pay an additional amount equal to six-tenths of one percent
(0.60%) of the aggregate enterprise value of Radian, less the $750,000
previously paid. In addition, Amerin agreed to reimburse DLJ, upon request by
DLJ from time to time, for all out-of-pocket expenses, including the reasonable
fees and expenses of counsel, incurred by DLJ in connection with its engagement
and to indemnify DLJ and related persons against liabilities relating to or
arising out of its engagement, including liabilities under U.S. federal
securities laws. DLJ and Amerin negotiated the terms of the fee arrangement, and
the Amerin board was aware of such arrangement, including the fact that a
significant portion of the aggregate fee payable to DLJ is contingent upon
completion of the merger. DLJ believes that the terms of this fee arrangement
are customary in transactions of this nature.
 
     As part of its investment banking business, DLJ is regularly engaged in the
valuation of businesses and securities in connection with mergers, acquisitions,
underwritings, sales and distributions of listed and unlisted securities,
private placements and valuations for corporate and other purposes. In the
ordinary course of its business, DLJ or its affiliates may at any time hold long
or short positions, and may trade or otherwise effect transactions, for its own
account or for the accounts of customers, in equity or debt securities of Amerin
or CMAC. DLJ co-managed Amerin's initial public offering of common stock in
November 1995 and its follow-on common stock offering in February 1997, and
received usual and customary compensation for its services.
 
OPINION OF CMAC'S FINANCIAL ADVISOR
 
     On November 22, 1998, Schroders delivered its opinion to the CMAC board
dated November 22, 1998, to the effect that, as of such date and based upon
assumptions made, matters considered and limits of review, as set forth in such
opinion, the exchange ratio was fair from a financial point of view to CMAC.
 
     A COPY OF THE SCHRODERS OPINION, WHICH SETS FORTH ASSUMPTIONS MADE,
PROCEDURES FOLLOWED, MATTERS CONSIDERED AND LIMITATIONS ON THE SCOPE OF REVIEW
UNDERTAKEN BY SCHRODERS, IS ATTACHED HERETO AS APPENDIX III AND IS INCORPORATED
BY REFERENCE IN THIS JOINT PROXY STATEMENT/PROSPECTUS. THE DESCRIPTION OF THE
WRITTEN OPINION SET FORTH IN THIS JOINT PROXY STATEMENT/PROSPECTUS IS QUALIFIED
IN ITS ENTIRETY BY REFERENCE TO THE FULL TEXT OF THE WRITTEN OPINION.
STOCKHOLDERS OF CMAC ARE URGED TO READ SUCH OPINION IN ITS ENTIRETY. THE
SCHRODERS OPINION IS ADDRESSED TO THE CMAC BOARD AND ADDRESSES ONLY THE FAIRNESS
FROM A FINANCIAL POINT OF VIEW OF THE EXCHANGE RATIO TO CMAC. IT DOES NOT
CONSTITUTE A RECOMMENDATION TO ANY CMAC STOCKHOLDER AS TO HOW SUCH STOCKHOLDER
SHOULD VOTE OR OTHERWISE ACT IN RESPECT OF THE MERGER. THE EXCHANGE RATIO WAS
DETERMINED ON THE BASIS OF NEGOTIATIONS BETWEEN CMAC AND AMERIN AND WAS APPROVED
BY THE CMAC BOARD.
 
OPINIONS OF FINANCIAL ADVISORS
                                       40
<PAGE>   45
 
     In connection with rendering its opinion, Schroders reviewed and analyzed,
among other things, the following:
 
- - a draft of the merger agreement dated November 19, 1998;
 
- - publicly available information relating to CMAC and Amerin that Schroders
  deemed relevant;
 
- - financial and operating information, including financial forecasts, prepared
  by or on behalf of CMAC and Amerin and provided to Schroders for purposes of
  its analysis;
 
- - financial and stock market data relating to CMAC and Amerin;
 
- - publicly available information with respect to other companies that Schroders
  believed to be comparable to Amerin or CMAC; and
 
- - publicly available information concerning the nature and terms of other
  transactions that Schroders considered to be reasonably comparable to the
  transactions contemplated by the merger agreement or otherwise relevant to its
  inquiry.
 
     Schroders also held discussions with members of senior managements of CMAC
and Amerin to review and discuss the information reviewed by Schroders and,
among other matters, Amerin's and CMAC's respective businesses, operations,
assets, financial condition and future prospects before and after giving effect
to the merger. Schroders also considered such other information, financial
studies, analyses, investigations and financial, economic and market criteria
which it deemed relevant, including Schroders' assessment of general economic,
market and monetary conditions.
 
     In preparing the Schroders opinion, Schroders assumed and relied on the
accuracy and completeness of all information supplied or otherwise made
available to Schroders or discussed with or reviewed by or for Schroders by CMAC
and Amerin, or otherwise publicly available, and did not independently verify
such information or undertake an independent evaluation or appraisal of any of
the assets or liabilities of CMAC or Amerin. In addition, although
representatives of Schroders visited material properties of CMAC, Schroders did
not assume any obligation to conduct, nor has it conducted, any physical
inspection of the properties or facilities of CMAC or Amerin. With respect to
the financial forecast information furnished to or discussed with Schroders by
CMAC and Amerin, including projected cost savings and operating synergies
resulting from the merger, Schroders assumed that such forecasts had been
reasonably prepared and reflected the best currently available estimates and
judgments of CMAC or Amerin management as to the expected future financial
performance of CMAC or Amerin, as the case may be. Schroders expresses no
opinion with respect to such forecasts or the assumptions upon which they are
based. Schroders further assumed, with CMAC's consent, that:
 
- - the merger will qualify as a tax-free reorganization for U.S. federal income
  tax purposes;
 
- - the merger will be accounted for as a pooling of interests under U.S.
  generally accepted accounting principles;
 
- - any material liabilities, contingent or otherwise, known or unknown, of CMAC
  and Amerin are as set forth in the consolidated financial statements of CMAC
  and Amerin, respectively;
 
- - in the course of obtaining the necessary regulatory or other consents and
  approvals, contractual or otherwise, for the merger, no restrictions,
  including any divestiture requirements or amendments or modifications, will be
  imposed that will have a material adverse effect on the contemplated benefits
  of the merger; and
 
- - the final form of the merger agreement would be substantially similar to the
  last draft reviewed by Schroders.
 
     The matters considered by Schroders in arriving at the Schroders opinion
are necessarily based on numerous macroeconomic, market, operating, financial
and other conditions and assumptions with respect to industry performance,
general business and economic conditions and other matters as they existed and
                                                  OPINIONS OF FINANCIAL ADVISORS
                                       41
<PAGE>   46
 
could be evaluated on, and on the information made available to Schroders, as of
the date of such opinion. Many of such factors are beyond the control of CMAC
and Amerin, and involve the application of complex methodologies and educated
judgments. Any estimates contained in Schroders' analyses are not necessarily
indicative of actual past or future results or values, which may be
significantly more or less favorable than as set forth in this joint proxy
statement/prospectus. Estimated values are not intended to be appraisals and do
not necessarily reflect the prices at which businesses or companies may be sold
in the future and such estimates are inherently subject to uncertainty. Actual
results of operations may be different from the results assumed in such
estimates. Schroders did not express any opinion as to the prices at which CMAC
common stock will trade following the announcement or completion of the merger,
which, Schroders noted, might vary depending upon, among other factors, changes
in interest rates, dividend rates, market conditions, general economic
conditions and other factors that generally influence the prices of securities.
The Schroders opinion does not present a discussion of the relative merits of
the merger as compared with any other business plan or opportunity that might be
presented to CMAC, including alternative business combinations with third
parties, or the effect of any other arrangement in which CMAC might engage.
 
     Set forth below is a summary of the material financial and comparative
analyses used by Schroders in connection with providing its opinion to the CMAC
board.
 
     Pro Forma Merger Analysis.  Schroders prepared a pro forma analysis of the
financial impact of the merger on CMAC. Based upon diluted earnings per common
share estimates for CMAC and Amerin prepared by the respective managements of
CMAC and Amerin for 1999 and 2000, Schroders compared the diluted earnings per
common share estimate of CMAC, on a stand-alone basis, to the diluted earnings
per common share estimate of the pro forma combined company before the impact of
one-time merger-related costs but after giving effect to the estimated impact of
synergies and integration costs as estimated by CMAC management and assuming the
merger will be accounted for as a pooling of interests for 1999. This analysis
showed that the merger would be modestly accretive to CMAC on an earnings per
common share basis in 1999 and 2000.
 
     Additionally, Schroders compared the projected book value per common share
of CMAC at December 31, 1998 on a stand-alone basis to that of the pro forma
combined company after giving effect to the estimated impact of transaction and
restructuring costs, as estimated by CMAC management. This analysis showed that
the merger would be accretive to CMAC on a projected book value per common share
basis at December 31, 1998.
 
     Schroders also analyzed the pro forma impact of the merger on CMAC's
capital structure based on 1998 year-end financial forecasts provided by
management of CMAC and Amerin, respectively. This analysis showed that CMAC's
total assets would increase from $837 million as of December 31, 1998 to
approximately $1,301 million pro forma for the merger. CMAC's total common
shareholder's equity would increase from $518 million as of December 31, 1998 to
approximately $900 million pro forma for the merger.
 
     Stock Price and Exchange Ratio Analyses.  Schroders reviewed the closing
prices of CMAC common stock and Amerin common stock over the period from July
29, 1997 through November 18, 1998. CMAC common stock declined from a closing
price of $46.938 per share on July 29, 1997 to a closing price of $40.688 per
share on November 18, 1998 with a high and low per share closing price during
the period of $69.250 and $28.000, respectively. During the same period, Amerin
common stock declined from a closing price of $24.313 per share to a closing
price of $20.000 per share with a high and low per share closing price during
the period of $33.688 and $13.813, respectively.
 
     In addition, Schroders analyzed the ratios of closing stock prices per
share of Amerin common stock to CMAC common stock as reported on the New York
Stock Exchange during various periods. Schroders observed that from July 29,
1997 through November 18, 1998, the high of the ratios was 0.6719 and the low of
the ratios was 0.4030. Schroders also calculated the average of the ratios of
the closing stock price per share of Amerin common stock and CMAC common stock
for various periods ending November 18,
OPINIONS OF FINANCIAL ADVISORS
                                       42
<PAGE>   47
 
1998. The exchange ratio was 4% greater than the average ratio of the closing
price of Amerin common stock to the closing price of CMAC common stock over the
previous 30 trading days.
 
     Selected Companies Analyses.  Schroders reviewed and compared actual and
estimated selected financial, operational and stock market information for CMAC
and Amerin with corresponding information for the following publicly traded
mortgage insurers; MGIC Investment Corporation, The PMI Group, Inc. and CMAC,
based on publicly available information and the mean earnings estimates from
First Call for MGIC Investment Corp. and PMI Group, and the forecasts of
management for CMAC and Amerin. Such analysis indicated, among other things,
that, based on closing stock prices as of November 18, 1998 and financial data
as of September 30, 1998, the mean price-earnings per common share multiples for
such publicly traded mortgage insurers on a latest twelve months, estimated 1998
and estimated 1999 bases was 11.6x, 11.5x and 10.0x, respectively, as compared
to the corresponding multiples of 11.5x, 11.2x and 9.6x for the merger, and the
mean price as a multiple of book value per common share was 2.2x for such
publicly traded mortgage insurers as compared to a multiple of 1.4x for the
merger.
 
     Selected Merger of Equals Transaction Analysis.  Using publicly available
information, Schroders reviewed the material terms and financial
characteristics, including the premium or discount of the offer value per common
share on November 18, 1998 over the closing price four weeks prior to
announcement of a transaction and the premium or discount of the offer value per
common share on November 18, 1998 over the average closing price during the 250
trading days prior to announcement of a transaction, of thirteen financial
services company merger or acquisition transactions publicly announced since
January 1, 1995 which Schroders deemed to be comparable to the merger. The
financial services company merger or acquisition transactions considered by
Schroders in its analysis consisted of the following transactions, which are
identified by acquiror/acquiree:
 
Banknorth Group/Evergreen Bancorp
Citizens Bancshares/Mid Am Incorporated
Mercantile Bancorp/Firstbank of Illinois
First Union/CoreStates Financial
Provident Companies/Paul Revere
Chemical Banking Corporation/Chase Manhattan
Fleet Financial Group/Shawmut National   Corporation
Santa Barbara Bancorp/Pacific Capital Bancorp
Banc One/First Chicago NBD
First American Corporation/Deposit Guaranty
First Bank System/US Bancorp
CoreStates Financial/Meridian Bancorp
First Union/First Fidelity Bancorp
 
     The mean for these transactions of the four week premium and the 250
trading day average premium were 27% and 32%, respectively. These compare to 45%
and 19% discount for the merger. Schroders observed that the CMAC common stock
closing price per share on November 18, 1998 represented an increase of 40% over
the four week prior closing price per share and a decline of 27% from the 250
trading day average price per share.
 
     Selected Insurance Acquisitions Analysis.  Using publicly available
information, Schroders reviewed the material terms and financial
characteristics, including offer price-to-book value per common share multiple
and price-to-forward estimated earnings per common share multiple, of nine
insurance company merger or acquisition transactions publicly announced since
January 1, 1996 which Schroders deemed to be pertinent to the merger. The
insurance company merger or acquisition transactions considered by Schroders in
its analysis consists of the following transactions, which are identified by
acquiror/acquiree:
 
Berkshire Hathaway/General Re
St. Paul Companies/USF&G Corporation
SAFECO/American States Financial
Munich Re/American Re
Provident Companies/Paul Revere
Nationwide Mutual Insurance Company/Allied
  Group
MBIA/CapMAC Holdings
HCC Insurance Holding/Avemco
General Re/National Re
 
     The mean for these transactions of price-to-book value per common share
multiple and price-to-forward estimated earnings per common share multiple were
2.6x and 15.6x, respectively, with a high of
 
                                                  OPINIONS OF FINANCIAL ADVISORS
                                       43
<PAGE>   48
 
3.9x and 20.8x and a low of 1.4x and 10.8x, respectively. These compare
favorably to multiples of 1.4x and 9.6x for the merger.
 
     Relative Contribution Analysis.  Schroders performed an analysis of the
respective financial contributions of CMAC and Amerin to the pro forma combined
company on several bases. This analysis demonstrated that CMAC and Amerin would
contribute
 
- - 67% and 33%, respectively, to primary insurance in force as of September 30,
  1998;
 
- - 65% and 35%, respectively, to risk in force as of September 30, 1998;
 
- - 63% and 37%, respectively, to total assets as of September 30, 1998;
 
- - 56% and 44%, respectively, to total common equity as of September 30, 1998;
 
- - 61% and 39%, respectively, to new primary insurance written over the previous
  twelve month period ending September 30, 1998;
 
- - 70% and 30%, respectively, to net premiums written over the previous twelve
  month period ending September 30, 1998;
 
- - 64% and 36%, respectively, to investment income over the previous twelve month
  period ending September 30, 1998;
 
- - 63% and 37%, respectively, to net income over the previous twelve month period
  ending September 30, 1998;
 
- - 63% and 37%, respectively, to forecast net income for the year ending December
  31, 1998;
 
- - 64% and 36%, respectively, to forecast net income for the year ending December
  31, 1999; and
 
- - 64% and 36%, respectively, to market capitalization as of November 18, 1998.
 
     Schroders calculated that the exchange ratio would result in an allocation
between the holders of CMAC common stock and Amerin common stock of pro forma
ownership of the combined entity equal to 62% and 38%, respectively.
 
     The foregoing summary is not intended to be a complete description of the
analyses performed by Schroders or of its presentation to the CMAC board. The
preparation of financial analyses and fairness opinions is a complex process and
is not necessarily susceptible to partial analysis or summary description.
Schroders believes that its analyses, and the summary set forth above, must be
considered as a whole, and that selecting portions of such analyses and of the
factors considered by Schroders, without considering all of such analyses and
factors, could create an incomplete view of the processes underlying the
analyses conducted by Schroders and its opinion. Schroders made no attempt to
assign specific weights to particular analyses. No company or transaction used
in the above analyses as a comparison is identical to CMAC or Amerin or the
transactions contemplated by the merger agreement.
 
     Schroders, as part of its investment banking business, is continually
engaged in the valuation of businesses and their securities in connection with
mergers and acquisitions, negotiated underwritings, competitive biddings,
secondary distributions of listed and unlisted securities, private placements
and valuations for estate, corporate and other purposes. Schroders has rendered
various investment banking and other advisory services to CMAC in the past and
may render such services in the future, for which it has received, and may
continue to receive, customary compensation from CMAC. In the ordinary course of
business, Schroders and its affiliates may actively trade the equity securities
of CMAC and Amerin for their own account and for the accounts of customers and,
accordingly, may at any time hold a long or short position in such securities.
 
     In its engagement letter with Schroders, CMAC has agreed to pay Schroders a
transaction fee equal to $3.3 million, of which $1.65 million was paid upon
mailing of this proxy statement and the balance of which will be paid upon
completion of the merger. If the merger is not completed and, during the term of
OPINIONS OF FINANCIAL ADVISORS
                                       44
<PAGE>   49
 
Schroder's engagement or within 24 months thereafter, CMAC receives a break-up,
termination, topping, expense reimbursement or similar fee or payment, Schroders
will be entitled to an additional cash fee equal to 20% of such fee or payment,
up to a maximum of $1.65 million. CMAC has agreed to reimburse Schroders for its
out-of-pocket expenses, including the fees and expenses of its legal counsel,
incurred in connection with its engagement, and to indemnify Schroders and
related persons against liabilities and expenses relating to or arising out of
its engagement, including liabilities under the federal securities laws. The
fact that a portion of Schroders' fee is contingent on completion of the merger
and Schroders participated in negotiation of the merger agreement, may create a
conflict of interest for Schroders that CMAC shareholders may want to take into
account when considering the Schroders opinion. According to Schroders, however,
the fees payable to Schroders in connection with the merger are insignificant
when compared to Schroders' total gross revenues.
 
                                                  OPINIONS OF FINANCIAL ADVISORS
                                       45
<PAGE>   50
 
                      OWNERSHIP OF CMAC, AMERIN AND RADIAN
 
     The following table sets forth information regarding the beneficial
ownership of the CMAC common stock and the Amerin common stock as of the date of
this joint proxy statement/prospectus of:
 
     - Each person known by either CMAC or Amerin to own beneficially more than
       5% of the outstanding shares of the CMAC common stock or Amerin common
       stock.
 
     - Each director of CMAC and Amerin.
 
     - The chief executive officer and the four other most highly compensated
       executive officers of each of CMAC and Amerin.
 
     - All directors and executive officers of CMAC as a group.
 
     - All directors and executive officers of Amerin as a group.
 
     The following table also sets forth information regarding the beneficial
ownership of Radian common stock, on a pro forma basis after giving effect to
the merger, by such persons based on their ownership of CMAC common stock and
Amerin common stock as of the date of this joint proxy statement/prospectus and
the exchange ratio in the merger. Unless otherwise indicated below, to the
knowledge of CMAC and Amerin, all persons listed below have sole voting and
investment power with respect to their shares of common stock, except to the
extent authority is shared by spouses under applicable law.
 
<TABLE>
<CAPTION>
                                                                                              PRO FORMA
                                 BENEFICIAL OWNERSHIP OF    BENEFICIAL OWNERSHIP OF    BENEFICIAL OWNERSHIP OF
                                    CMAC COMMON STOCK         AMERIN COMMON STOCK        RADIAN COMMON STOCK
NAME OF BENEFICIAL OWNER         -----------------------    -----------------------    -----------------------
- ------------------------           SHARES       PERCENT       SHARES       PERCENT      SHARES         PERCENT
EXECUTIVE OFFICER AND DIRECTORS  ----------     --------    ----------     --------    ---------       -------
<S>                              <C>            <C>         <C>            <C>         <C>             <C>
Herbert Wender (1)..........       261,500         1.2%            --          --        261,500           *
Frank P. Filipps (2)........       167,234           *             --          --        167,234           *
Paul F. Fischer (3).........        50,559           *             --          --         50,559           *
Douglas J. MacLeod (4)......        96,181           *             --          --         96,181           *
James C. Miller (5).........        44,995           *             --          --         44,995           *
C. Robert Quint (6).........        65,267           *             --          --         65,267           *
David C. Carney (7).........        20,600           *             --          --         20,600           *
James W. Jennings (8).......        19,600           *             --          --         19,600           *
Ronald W. Moore (9).........        19,000           *             --          --         19,000           *
Robert W. Richards (10).....        18,500           *             --          --         18,500           *
Anthony W. Schweiger (11)...        19,000           *             --          --         19,000           *
Claire M. Fagin (12)........        12,000           *             --          --         12,000           *
William Carroll (13)........           356           *             --          --            356           *
Gerald L. Friedman (14).....            --          --      1,267,742         4.8%       676,086         1.8%
Alan F. Goldberg (15).......            --          --        705,018         2.7%       375,986         1.0%
Howard I. Hoffen (15).......            --          --        705,018         2.7%       375,986         1.0%
David I. Vickers (16).......            --          --         10,821           *          5,770           *
Larry E. Swedroe (17).......            --          --          2,760           *          1,471           *
Randolph C. Sailer II (18)..            --          --         17,998           *          9,598           *
Roy J. Kasmar (19)..........            --          --        334,400         1.3%       178,335           *
Jerome J. Selitto (20)......            --          --        328,840         1.2%       175,370           *
William V. Nardiello (21)...            --          --         57,915           *         30,886           *
Albert V. Will (22).........            --          --         46,335           *         24,710           *
</TABLE>
 
OWNERSHIP OF CMAC, AMERIN AND RADIAN
                                       46
<PAGE>   51
 
<TABLE>
<CAPTION>
                                                                                              PRO FORMA
                                 BENEFICIAL OWNERSHIP OF    BENEFICIAL OWNERSHIP OF    BENEFICIAL OWNERSHIP OF
                                    CMAC COMMON STOCK         AMERIN COMMON STOCK        RADIAN COMMON STOCK
NAME OF BENEFICIAL OWNER         -----------------------    -----------------------    -----------------------
- ------------------------           SHARES       PERCENT       SHARES       PERCENT      SHARES         PERCENT
EXECUTIVE OFFICER AND DIRECTORS  ----------     --------    ----------     --------    ---------       -------
<S>                              <C>            <C>         <C>            <C>         <C>             <C>
All executive officers and
  directors of CMAC as a group
  (13 persons)..............       794,792         3.5%            --          --        794,792         2.2%
All executive officers and
  directors of Amerin as a
  group (10 persons)........            --          --      2,771,829        10.5%     1,478,216         4.0%
FIVE PERCENT HOLDERS
Morgan Stanley Dean Witter &
  Co. (23)..................     1,437,352         6.3%            --          --      1,437,352         3.9%
First Plaza Group Trust (24)...         --          --      1,350,189         5.1%       720,055         2.0%
Jurika & Voyles, L.P. (25)..            --          --      1,976,033         7.5%     1,053,818         2.9%
Legg Mason, Inc. (26).......            --          --      1,800,613         6.8%       960,266         2.6%
Lazard Freres & Co. LLC (27)...         --          --      1,617,517         4.4%       862,622         2.3%
Mellon Bank Corporation (28)...         --          --      1,457,095         5.5%       777,068         2.1%
</TABLE>
 
- -------------------------
   * Less than one percent.
 
 (1) Includes 235,500 shares of CMAC common stock that may be acquired upon
     exercise of director stock options.
 
 (2) Includes 1,984 shares of CMAC common stock allocable to employee
     contributions under the CMAC Investment Corporation Savings Incentive Plan
     as of the date of this joint proxy statement/prospectus, as to which the
     employee has dispositive power and 161,250 shares of CMAC common stock that
     may be acquired upon exercise of employee options.
 
 (3) Includes 2,385 shares of CMAC common stock allocable to employee
     contributions under the CMAC Investment Corporation Savings Incentive Plan
     as of the date of this joint proxy statement/prospectus, as to which the
     employee has dispositive power and 47,125 shares of CMAC common stock that
     may be acquired upon exercise of employee stock options.
 
 (4) Includes 2,205 shares of CMAC common stock allocable to employee
     contributions under the CMAC Investment Corporation Savings Incentive Plan
     as of the date of this joint proxy statement/prospectus, as to which the
     employee has dispositive power and 93,750 shares of CMAC common stock that
     may be acquired upon exercise of employee stock options.
 
 (5) Includes 3,795 shares of CMAC common stock allocable to employee
     contributions under the CMAC Investment Corporation Savings Incentive Plan
     as of the date of this joint proxy statement/prospectus that Mr. Miller
     accumulated during his time as an employee of CMAC, and 3,000 shares of
     CMAC common stock that may be acquired upon exercise of director stock
     options. Also includes 200 shares owned by Mr. Miller's daughter as to
     which he disclaims beneficial ownership.
 
 (6) Includes 3,117 shares of CMAC common stock allocable to employee
     contributions under the CMAC Investment Corporation Savings Incentive Plan
     as of the date of this joint proxy statement/prospectus, as to which the
     employee has dispositive power and 60,750 shares of CMAC common stock that
     may be acquired upon exercise of employee stock options.
 
 (7) Includes 18,000 shares of CMAC common stock that may be acquired upon
     exercise of director stock options.
 
                                            OWNERSHIP OF CMAC, AMERIN AND RADIAN
                                       47
<PAGE>   52
 
 (8) Includes 17,000 shares of CMAC common stock that may be acquired upon
     exercise of director stock options.
 
 (9) Includes 18,000 shares of CMAC common stock that may be acquired upon
     exercise of director stock options.
 
(10) Includes 18,000 shares of CMAC common stock that may be acquired upon
     exercise of director stock options.
 
(11) Includes 13,500 shares of CMAC common stock that may be acquired upon
     exercise of director stock options.
 
(12) Includes 12,000 shares of CMAC common stock that may be acquired upon
     exercise of director stock options.
 
(13) Includes 356 shares of CMAC common stock allocable to employee
     contributions under the CMAC Investment Corporation Savings Incentive Plan
     as of the date of this joint proxy statement/ prospectus, as to which the
     employee has dispositive power.
 
(14) Includes 111,200 shares of Amerin common stock issuable upon exercise of
     stock options, 7,500 shares held by the Friedman Family Foundation, a
     private charitable foundation, 30,000 shares held by the Gerald L. Friedman
     Charitable Remainder Unitrust of 1997, a charitable remainder trust, 30,000
     shares held by the Sheree A. Friedman Charitable Remainder Unitrust of
     1997, a charitable remainder trust, 6,875 shares (as to which Mr. Friedman
     disclaims beneficial ownership) held by the Sarah Beth Friedman 1989 Trust,
     a trust created for the benefit of Mr. Friedman's daughter, 6,875 shares
     (as to which Mr. Friedman disclaims beneficial ownership) held by Rachael
     L. Friedman (Mr. Friedman's daughter), 7,000 shares (as to which Mr.
     Friedman disclaims beneficial ownership) held by Daniel B. Rand and 166,800
     options that are exercisable upon completion of the merger.
 
(15) As of September 1998. All of the shares shown are held by two wholly-owned
     subsidiaries of Morgan Stanley Dean Witter & Co. Mr. Goldberg and Mr.
     Hoffen are a Managing Director and principal, respectively, of Morgan
     Stanley & Co., Incorporated, an affiliate of Morgan Stanley Dean Witter &
     Co. Share data shown for such individuals reflects shares shown as held by
     the two wholly-owned subsidiaries of Morgan Stanley Dean Witter & Co., as
     to which such individuals disclaim beneficial ownership.
 
(16) Includes 8,321 shares of Amerin common stock issuable upon exercise of
     vested stock options.
 
(17) Includes 667 shares of Amerin common stock issuable upon exercise of vested
     stock options.
 
(18) Includes 17,998 shares of Amerin common stock issuable upon exercise of
     vested stock options.
 
(19) Includes 10,950 shares as to which restrictions on transferability will
     lapse upon completion of the merger, 131,324 shares of Amerin common stock
     issuable upon exercise of vested stock options and 181,241 stock options
     that will vest upon completion of the merger.
 
(20) Includes 123,950 shares of Amerin common stock issuable upon exercise of
     vested stock options and 173,300 stock options that will become exercisable
     upon completion of the merger.
 
(21) Includes 57,915 shares of Amerin common stock issuable upon exercise of
     stock options that will vest upon completion of the merger.
 
(22) Includes 46,335 shares of Amerin common stock issuable upon exercise of
     stock options that will vest upon completion of the merger.
 
(23) The address of Morgan Stanley Dean Witter & Co. is 1585 Broadway, New York,
     New York 10036.
 
(24) The address of First Plaza Group Trust is Mellon Bank, N.A., as Trustee,
     One Mellon Bank Center, Pittsburgh, Pennsylvania 15258.
 
(25) The address of Jurika & Voyles, L.P. is 1999 Harrison Street, Suite 700,
     Oakland, California 94612.
 
(26) The address of Legg Mason, Inc. is 100 Light Street, Baltimore, Maryland
     21202.
 
(27) The address of Lazard Freres & Co. LLC is 30 Rockefeller Plaza, New York,
     New York 10020.
 
(28) The address of Mellon Bank Corporation is One Mellon Bank Center,
     Pittsburgh, Pennsylvania 15258.
 
OWNERSHIP OF CMAC, AMERIN AND RADIAN
                                       48
<PAGE>   53
 
                   INTERESTS OF CERTAIN PERSONS IN THE MERGER
 
     In considering the respective recommendations of the Amerin board and the
CMAC board with respect to the merger, you should be aware that members of the
boards and management of Amerin and CMAC have interests in the merger that are
different from, or in addition to, your interests.
 
POST-MERGER BOARD
 
     Amerin and CMAC expect that Radian's board will consist of fourteen
directors, nine of whom will be designated by CMAC and five of whom will be
designated by Amerin. See "Directors and Management of Radian Following the
Merger."
 
POST-MERGER MANAGEMENT
 
     Frank P. Filipps, who currently serves as CMAC's president and chief
executive officer, will be chairman of the board and chief executive officer of
Radian. Roy J. Kasmar, who currently serves as Amerin's president and chief
operating officer, will be president and chief operating officer of Radian.
Gerald L. Friedman, who currently serves as Amerin's chairman and chief
executive officer, will be chairman emeritus of Radian. Herbert Wender, who
currently serves as CMAC's chairman, will be chairman of the executive committee
and lead director of Radian.
 
KASMAR EMPLOYMENT AGREEMENT
 
     As president and chief operating officer of Amerin, Mr. Kasmar received a
base salary of $275,000 and a bonus of $325,000 for calendar year 1998. As
president and chief operating officer of Radian, Mr. Kasmar will receive the
base salary and bonus described below.
 
     Roy J. Kasmar will serve as president and chief operating officer of Radian
after the closing of the merger under the terms of an employment agreement with
Radian. The material terms of this agreement are described below.
 
- - Term.  The term of this agreement is two years.
 
- - Base Salary.  $375,000 per year, subject to annual increases at the discretion
  of the Radian board.
 
- - Bonus.  Target bonus of $475,000 per year, subject to annual increases at the
  discretion of the Radian board. The bonus awarded to Mr. Kasmar each year will
  be based upon whether Radian meets financial and operating targets to be
  established in the normal running of its business. In both 1999 and 2000, Mr.
  Kasmar will be entitled to receive a minimum bonus of $237,500.
 
- - Directorship.  Mr. Kasmar has the right to be nominated for election as a
  director of Radian while he is employed by Radian.
 
- - Benefit Plans and Insurance.  Mr. Kasmar will be entitled to participate in
  all of Radian's benefit plans to the same extent as other senior executive
  officers of Radian. Radian will provide Mr. Kasmar with life insurance and
  disability insurance to the same extent as provided, from time to time, to the
  chief executive officer of Radian. Although not specified in his employment
  agreement, Mr. Kasmar will be entitled to participate in Radian's Equity
  Compensation Plan on the same terms as other comparable officers. Radian would
  expect Mr. Kasmar to receive from time to time such numbers of options to
  purchase shares of Radian as the Radian board considers appropriate in the
  ordinary course of its administration of that plan.
 
- - Relocation Expenses.  Radian will pay to Mr. Kasmar relocation benefits for
  moving to Radian's headquarters. These benefits include purchasing Mr.
  Kasmar's existing home at fair market value plus $75,000, paying moving and
  storage expenses, real estate brokerage expenses, duplicate financing
  expenses, if any, temporary living expenses of up to $60,000 and a gross-up
  for any income taxes payable in connection with the relocation benefits.
 
                                                    INTERESTS OF CERTAIN PERSONS
                                       49
<PAGE>   54
 
- - Severance.  Mr. Kasmar's existing severance agreement with Amerin will be
  terminated and replaced by his employment agreement. If Mr. Kasmar's
  employment is terminated at any time during the two years following the
  merger, either:
 
  [ARROW] by Radian other than for cause, which in this agreement means as a
          result of specified intentional wrongful acts taken by Mr. Kasmar
          against Radian, or other than as a result of Mr. Kasmar's permanent
          disability, or
 
  [ARROW] by Mr. Kasmar for good reason, which means as a result of specified
          actions taken by Radian that are adverse to Mr. Kasmar, such as
          failure to maintain his position or an adverse change in his
          authorities or compensation,
 
  then Mr. Kasmar will be entitled to receive:
 
  [ARROW] a lump sum payment of three times his base salary,
 
  [ARROW] continuation of welfare benefits for a period of two years, and
 
  [ARROW] gross-up tax payments to the extent that Mr. Kasmar would otherwise be
          liable for payment of an excise tax under Section 280G of the Internal
          Revenue Code.
 
  If Mr. Kasmar's employment terminates for any reason other than for cause
  during the two-year period following the merger, Radian must repurchase Mr.
  Kasmar's house in the Philadelphia area at fair market value plus $75,000.
 
     Amerin's obligation to close the merger was conditioned on the execution by
Mr. Kasmar of the employment contract described above with CMAC because the
Amerin board of directors felt that Mr. Kasmar's retention by CMAC was necessary
to ensure that Amerin's client base would remain intact after the merger. The
Amerin board of directors believed that the assumption by Mr. Kasmar of a
significant position at Radian after the merger would reassure the Amerin sales
team, which controls Amerin's relationships with its customers, thereby
improving the chance that Radian would be able to retain their services after
the merger. Since the Amerin sales force supervises Amerin's relationships with
its customers, the Amerin board of directors believed that the retention of
these employees would increase the likelihood that Amerin's customers would
become customers of Radian after the merger. Mr. Kasmar has executed the
employment agreement described above thereby satisfying a condition to Amerin's
obligation to close the merger.
 
KASMAR CHANGE OF CONTROL AGREEMENT
 
     Mr. Kasmar has also entered into a change of control agreement with Radian
that is similar to the existing change of control agreements in effect for
CMAC's executives. This agreement provides that if, at any time within two years
after any change in control of Radian, other than the merger, Mr. Kasmar's
employment is terminated:
 
- - by Radian, or its successor, other than for cause, which in this agreement
  means specified actions adverse to Radian such as misappropriation of funds or
  gross negligence, or other than as a result of continued illness or incapacity
  for 12 months, or
 
- - by Mr. Kasmar because of a significant reduction in Mr. Kasmar's
  responsibilities or position, or other specified adverse changes made by
  Radian,
 
then Mr. Kasmar will be entitled to receive:
 
- - a lump sum payment equal to two times his base salary and target annual bonus
  in effect on the termination date,
 
- - continuation of life insurance, disability, accident and health insurance
  benefits for a period of up to three years, and
 
INTERESTS OF CERTAIN PERSONS
                                       50
<PAGE>   55
 
- - gross-up tax payments to the extent that Mr. Kasmar would otherwise be liable
  for payment of an excise tax under Section 280G of the Internal Revenue Code.
 
Upon a change of control, all of Mr. Kasmar's outstanding Radian stock options
and restricted stock will automatically vest. If any event occurs that would
entitle Mr. Kasmar to benefits under this agreement and Mr. Kasmar's employment
agreement, Mr. Kasmar will be entitled to receive the greater of the two
benefits, but will not be entitled to duplicate benefits.
 
     For purposes of Mr. Kasmar's change of control agreement, a change of
control will be deemed to occur when:
 
- - a person or group, other than Radian, one of its affiliates or one of its
  employee benefit plans, becomes the owner of 20% or more of the shares of
  Radian then outstanding and entitled to vote for directors generally, or
  acquires substantially all of the assets of Radian; or
 
- - during any 24-month period, there is a change in the majority of the Radian
  board, unless at least 75% of the individuals who were directors at the
  beginning of the 24-month period approve the election or nomination of at
  least 75% of the new directors.
 
AMERIN STOCK OPTION AND SEVERANCE ARRANGEMENTS
 
     Five officers of Amerin or Amerin Guaranty -- Roy J. Kasmar, Gerald L.
Friedman, Jerome J. Selitto, Albert V. Will and William V. Nardiello -- are
parties to agreements which provide for the benefits specified below in
connection with a change in control of Amerin. The merger will constitute a
change in control for purposes of these agreements. However, Mr. Kasmar's
existing agreement with Amerin will be terminated and replaced by his employment
agreement.
 
     Accelerated Vesting of Options.  Agreements relating to previously granted
stock options provide that all unvested Amerin stock options held by these five
officers will automatically vest upon completion of the merger and will be
converted into substitute options. See "The Merger Agreement -- Treatment of
Amerin Stock Options." In addition, under Mr. Kasmar's agreement, restrictions
on the transfer of 13,101 shares of Amerin common stock held by him will lapse
once the merger is completed.
 
     Severance.  Under his severance agreement, each of Mr. Friedman and Mr.
Selitto will be entitled to receive:
 
- - an amount equal to three times his annual base salary, not including any bonus
  amounts, in effect at the time of such termination,
 
- - continuation of life, disability, accident and health insurance benefits for a
  period of two years, and
 
- - gross-up payments,
 
- - if, at any time within two years after any change in control of Amerin, his
  employment is terminated other than for cause or disability or if he
  terminates his own employment for good reason. Cause, disability, good reason
  and change in control are defined substantially as defined above in Mr.
  Kasmar's employment agreement.
 
     In addition to the contractual severance benefits discussed in the
preceding paragraph, Amerin will pay severance or retention amounts to current
employees who will not be offered positions with Radian. Generally, the
severance or retention amount paid to each individual will be a function of the
employee's title, tenure and importance to the closing of the merger. For
example, senior vice presidents and above will receive:
 
  [ARROW] severance or retention amounts equal to between one and two year's
          base salary, not including any bonus amounts, and
 
  [ARROW] continuation of health insurance benefits for periods ranging from one
          year to two years.
 
                                                    INTERESTS OF CERTAIN PERSONS
                                       51
<PAGE>   56
 
     The following table sets forth the names, positions, estimated aggregate
cash and cash equivalent amounts and number of stock options held for each
person expected to receive benefits under the arrangements described in this
section. These benefits are based on compensation levels as of the date of this
joint proxy statement/prospectus and the assumptions set forth in footnotes to
the table:
 
<TABLE>
<CAPTION>
                                                                                     AGGREGATE NO. OF
                                                          AGGREGATE CASH AND CASH      ACCELERATED
NAME                               POSITION                EQUIVALENT AMOUNTS(1)        OPTIONS(6)
- ----                     -----------------------------    -----------------------    ----------------
<S>                      <C>                              <C>                        <C>
Jerome J. Selitto        Vice Chairman                         $2,132,610(2)             173,300
Gerald L. Friedman       Chairman                              $1,959,300(2)             166,800
William V. Nardiello     Executive Vice President,             $  862,924(3)              57,915
                         Marketing
Roy J. Kasmar            President                             $  625,673(4)             181,241
Albert V. Will           Executive Vice President,             $  518,373(5)              46,335
                         Operations
David I. Vickers         Senior Vice President and             $  350,000(7)                  --
                         Chief Financial Officer
Randolph C. Sailer II    Senior Vice President and             $  446,000(8)                  --
                         General Counsel
</TABLE>
 
- ---------------
(1) All figures are based on the following assumptions:
 
     - the merger is completed on May 28, 1999;
 
     - on such date each share of Amerin common stock has a value of $25.00;
 
     - the pre-tax value of each stock option which will become vested upon the
       closing of the merger that would otherwise have remained unvested is
       equal to the difference between $25.00 and the option exercise price; and
 
     - aggregate figures do not include the value of any possible gross-up
       payments, the existence or amount of which cannot be ascertained with any
       certainty as of the date of this joint proxy statement/prospectus, or any
       life, disability, accident and health insurance benefits.
 
(2) Includes three years' base salary and the aggregate pre-tax value of Amerin
    stock options which will become vested upon the closing of the merger.
 
(3) Includes one year's base salary and the aggregate pre-tax value of Amerin
    stock options which will become vested upon the closing of the merger.
 
(4) Includes the aggregate pre-tax value of Amerin stock options which will
    become vested upon the closing of the merger and 10,950 shares of Amerin
    common stock as to which existing restrictions on transfer will be lifted
    upon the closing of the merger.
 
(5) Includes the aggregate pre-tax value of Amerin stock options that will
    become vested upon the closing of the merger.
 
(6) Includes only stock options that vest upon the closing of the merger.
 
(7) Includes one and one half year's base salary and a retention bonus.
 
(8) Includes two years' base salary and a retention bonus.
 
MORGAN STANLEY FEE
 
     Alan F. Goldberg and Howard I. Hoffen, who are currently directors at
Amerin, are also employees of Morgan Stanley & Co. Incorporated. In its
engagement letter with Morgan Stanley in connection with the merger, Amerin has
agreed to pay Morgan Stanley for its services as a financial advisor a
transaction fee equal to 0.2% of the merger's aggregate value, or approximately
$1,250,000. Morgan Stanley provided
 
INTERESTS OF CERTAIN PERSONS
                                       52
<PAGE>   57
 
Amerin with some preliminary financial analyses of the strategic alternatives
available to Amerin and reviewed DLJ's financial analyses prepared in connection
with the delivery of DLJ's fairness opinion to the Amerin board. Although Morgan
Stanley did not render a fairness opinion to the Amerin board, Morgan Stanley
advised the Amerin board that DLJ's analyses appeared reasonable. The aggregate
value of the merger will be the value of the consideration paid per share of
Amerin common stock times the total number of shares of Amerin common stock,
including the number of shares which would be outstanding upon exercise of any
then vested in-the-money options, convertible debt, convertible preferred stock
or warrants, of Amerin, plus the value of any debt, capital lease, and preferred
stock obligations of Amerin assumed, retired or defeased in connection with the
transaction. Amerin has agreed to indemnify Morgan Stanley and related persons
against liabilities and expenses relating to or arising out of its engagement.
 
INDEMNIFICATION AND INSURANCE
 
     CMAC has agreed that all rights to indemnification and exculpation from
liabilities for acts or omissions occurring at or prior to the effective time of
the merger now existing in favor of the current or former directors or officers
of Amerin and its subsidiaries as provided in their respective certificates of
incorporation or bylaws and any indemnification agreements of Amerin will be
assumed by Radian and will continue in full force and effect under the same
terms. In addition, after the effective time of the merger, directors and
officers of Amerin who become directors and officers of Radian will be entitled
to the same indemnity rights and protections as are afforded to the other
directors and officers of Radian.
 
     In addition, for a period of six years after the effective time of the
merger, Radian will maintain in effect directors' and officers' liability
insurance covering acts or omissions occurring prior to the effective time with
respect to those persons who are currently covered by Amerin's directors' and
officers' liability insurance policy on terms with respect to coverage and
amount which, in the aggregate, are no less favorable than those of Amerin's
current policy in effect on the date of the merger agreement; provided that in
no event will Radian be required to pay more than 175% of CMAC's current annual
premium.
 
                                                    INTERESTS OF CERTAIN PERSONS
                                       53
<PAGE>   58
 
                              THE MERGER AGREEMENT
 
     The following summary of the merger agreement is qualified in its entirety
by reference to the complete text of the merger agreement, which is incorporated
by reference in this joint proxy statement/prospectus and attached as Appendix
I.
 
GENERAL
 
     The merger agreement provides that Amerin will merge with and into CMAC
with CMAC continuing as the surviving corporation upon the satisfaction or
waiver of the conditions to the merger specified in the merger agreement. The
merger will become effective at the time the certificate of merger is filed with
the Delaware Secretary of State, or at such later time as may be agreed in
writing by the parties and specified in the certificate of merger. CMAC will
change its name to Radian Group Inc. at the effective time of the merger.
 
MERGER CONSIDERATION
 
     The merger agreement provides that each share of common stock, par value
$.01 per share, of Amerin outstanding immediately prior to the effective time,
together with the preferred share purchase rights issued to the common
stockholders under the rights agreement dated as of October 14, 1998 between
Amerin and Norwest Bank Minnesota, National Association will, at the effective
time of the merger, be converted into the right to receive 0.5333 fully paid and
nonassessable shares of the common stock, par value $.001 per share, of CMAC and
the same number of preferred share purchase rights issuable under the terms of
the rights agreement dated as of April 14, 1998 between CMAC and The Bank of New
York.
 
TREATMENT OF AMERIN STOCK OPTIONS
 
     The merger agreement provides that at the effective time of the merger each
outstanding option to purchase shares of Amerin common stock will become an
option to acquire the number of shares of Radian common stock equal to the
product of the exchange ratio times the number of shares of Amerin common stock
subject to such option, at a price per share equal to the aggregate exercise
price for the shares of Amerin common stock subject to such option divided by
the number of full shares of Radian common stock deemed to be purchasable upon
complete exercise of such option; provided, however, that the number of shares
of Radian common stock that may be purchased upon exercise of any substitute
option will not include any fractional shares and upon the last such exercise of
any substitute option Radian will pay to the holder of such substitute option an
amount of cash equal to such fraction multiplied by the closing price of Radian
common stock as reported on the NYSE on the date of such exercise. See
"Interests of Certain Persons in the Merger and Related Matters -- Amerin Stock
Option and Severance Arrangements."
 
EXCHANGE OF SHARES
 
     Prior to the effective time of the merger, CMAC will appoint an exchange
agent for the purpose of exchanging certificates representing Amerin common
stock for the merger consideration. As of the effective time of the merger, the
surviving corporation will make available to the exchange agent, as needed, the
merger consideration to be paid in respect of shares of Amerin common stock.
Promptly after the effective time of the merger, Radian or the exchange agent
will send to each holder of shares of Amerin common stock at the effective time
of the merger a letter of transmittal for use in such exchange. Holders of
Amerin common stock that surrender their certificates to the exchange agent,
together with a properly completed letter of transmittal, will receive Radian
common stock certificates representing such number of shares as described under
"-- Merger Consideration". Holders of unexchanged shares of Amerin common stock
will not be entitled to receive any dividends, interest or other distributions
payable by Radian after the effective time of the merger until their
certificates are surrendered. Upon surrender,
 
THE MERGER AGREEMENT
                                       54
<PAGE>   59
 
however, subject to applicable laws, there will be paid, without interest, to
the person in whose name the Radian common stock has been registered, all
dividends, interest, and other distributions payable in respect of such
securities on a date subsequent to, and in respect of a record date after, the
effective time of the merger.
 
     No fractional shares of Radian common stock will be issued in the merger.
Instead, Amerin stockholders that would otherwise be entitled to receive
fractional shares will receive an amount in cash determined by multiplying the
closing sale price of CMAC common stock on the NYSE on the trading day
immediately preceding the effective time of the merger by the fraction of a
share of CMAC common stock to which such holder otherwise would have been
entitled.
 
COVENANTS AND REPRESENTATIONS AND WARRANTIES
 
     Conduct of Business.  From the date of execution of the merger agreement
until the effective time of the merger, CMAC, Amerin and their respective
subsidiaries are required to conduct their business in the ordinary course
consistent with past practice and to use their reasonable best efforts to
preserve intact their business organizations and relationships with third
parties and to keep available the services of their present officers and
employees. During this period, CMAC and Amerin are each prohibited from directly
or indirectly engaging in specified material transactions, such as asset
acquisitions or dispositions, without the consent of the other party.
 
     No Solicitation by Amerin.  Amerin has agreed that it will not, nor will it
authorize or permit any subsidiary, or any officer, director, employee or any
other advisor or representative of Amerin or any of its subsidiaries, to:
 
- - solicit, initiate or knowingly encourage the submission of any Amerin
Acquisition Proposal,
 
- - enter into any agreement with respect to any Amerin Acquisition Proposal or
 
- - discuss or negotiate, or furnish any information with respect to, or take any
other action to facilitate any inquiries or the making of any proposal that
constitutes, or may reasonably be expected to lead to, any Amerin Acquisition
Proposal. Amerin may, however, in response to an unsolicited request, discuss or
negotiate with, or furnish information under the terms of an acceptable
confidentiality agreement to, any person if such person is willing to make an
Amerin Superior Proposal and if the Amerin board determines in good faith after
consultation with its financial advisor that such Amerin Superior Proposal is
reasonably capable of being completed on the terms proposed. In the merger
agreement:
 
- - "Amerin Acquisition Proposal" means:
 
  [ARROW] any proposal for a merger, consolidation, share exchange, business
          combination or other similar transaction involving Amerin or any of
          its subsidiaries or
 
  [ARROW] any proposal or offer to acquire, directly or indirectly, an equity
          interest in, any voting securities of, or a substantial portion of the
          assets of, Amerin or any of its subsidiaries, other than the
          transactions contemplated by the merger agreement.
 
- - "Amerin Superior Proposal" means a written third party proposal to acquire
Amerin in a tender or exchange offer, a merger, a share exchange, a sale of all
or substantially all its assets or otherwise on terms which a majority of the
Amerin board determines in good faith, after taking into account the advice of
independent financial advisors, the strategic benefits anticipated to be derived
from the merger and the prospects of CMAC and Amerin as a combined company, to
be more favorable over the long term to Amerin and its stockholders than the
merger and for which financing, to the extent required, is then fully committed
or reasonably determined to be available by the Amerin board.
 
     Amerin Board's Covenant to Recommend.  The Amerin board has agreed to
recommend the approval and the adoption of the merger agreement to Amerin's
stockholders. Notwithstanding the foregoing, the Amerin board is permitted to
withdraw or modify in a manner adverse to CMAC such recommendation if
 
                                                            THE MERGER AGREEMENT
                                       55
<PAGE>   60
 
it has complied with its obligations under the covenant described above under
"-- No Solicitation by Amerin" and an Amerin Superior Proposal is pending at the
time the Amerin board determines to take any such action or inaction. Amerin
must advise CMAC of the receipt of, and identity of the person making, the
Amerin Superior Proposal and must keep CMAC informed of the status and material
terms of any Amerin Superior Proposal.
 
     No Solicitation by CMAC.  CMAC has agreed that it will not, nor will it
authorize or permit any of its subsidiaries or any officer, director, employee
or any other advisor or representative of CMAC or any of its subsidiaries to:
 
- - solicit, initiate or knowingly encourage the submission of any CMAC
Acquisition Proposal,
 
- - enter into any agreement with respect to any CMAC Acquisition Proposal or
 
- - discuss or negotiate, or furnish any information with respect to, or take any
other action to facilitate any inquiries or the making of any proposal that
constitutes, or may reasonably be expected to lead to, any CMAC Acquisition
Proposal. CMAC may, however, in response to an unsolicited request, discuss or
negotiate with, or furnish information under the terms of an acceptable
confidentiality agreement to, any person if such person is willing to make a
CMAC Superior Proposal and if the CMAC board determines in good faith after
consultation with its financial advisor that such CMAC Superior Proposal is
reasonably capable of being completed on the terms proposed. In the merger
agreement:
 
- - "CMAC Acquisition Proposal" means:
 
  [ARROW] any proposal for a merger, consolidation, share exchange, business
          combination or other similar transaction involving CMAC or any of its
          subsidiaries or
 
  [ARROW] any proposal or offer to acquire, directly or indirectly, an equity
          interest in, any voting securities of, or a substantial portion of the
          assets of, CMAC or any of its subsidiaries, other than the
          transactions contemplated by the merger agreement.
 
- - "CMAC Superior Proposal" means a written third party proposal to acquire CMAC
in a tender or exchange offer, a merger, a share exchange, a sale of all or
substantially all its assets or otherwise on terms which a majority of the CMAC
board determines in good faith, after taking into account the advice of
independent financial advisors, the strategic benefits anticipated to be derived
from the merger and the prospects of CMAC and Amerin as a combined company, to
be more favorable over the long term to CMAC and its stockholders than the
merger and for which financing, to the extent required, is then fully committed
or reasonably determined to be available by the CMAC board.
 
     CMAC Board's Covenant to Recommend.  The CMAC board has agreed to recommend
the approval and the adoption of the merger agreement to CMAC's stockholders.
Notwithstanding the foregoing, the CMAC board is permitted to withdraw or modify
in a manner adverse to Amerin such recommendation if it has complied with its
obligations under the covenant described above under "-- No Solicitation by
CMAC" and a CMAC Superior Proposal is pending at the time the CMAC board
determines to take any such action or inaction. CMAC must advise Amerin of the
receipt of, and identity of the person making, the CMAC Superior Proposal and
must keep Amerin informed of the status and material terms of any CMAC Superior
Proposal.
 
     Best Efforts.  Each party has agreed to use its best efforts to take all
actions and do all things necessary or advisable under applicable laws and
regulations to complete the merger and the transactions contemplated by the
merger agreement.
 
     Employee Benefits Matters.  From and after the effective time of the
merger, Radian will cause the employees of Amerin and its subsidiaries to
receive compensation and employee benefits that are, in the aggregate, no less
generous than those currently received by similarly situated employees of CMAC
and its subsidiaries.
 
THE MERGER AGREEMENT
                                       56
<PAGE>   61
 
     Indemnification of Amerin Directors and Officers.  See "Interests of
Certain Persons in the Merger and Related Matters -- Indemnification and
Insurance."
 
     Representations and Warranties.  The merger agreement contains reciprocal
representations and warranties made by Amerin and CMAC to each other customary
for a merger transaction between two public companies. The representations and
warranties in the merger agreement do not survive the effective time of the
merger.
 
CONDITIONS TO THE MERGER
 
     Conditions to Each Party's Obligations to Effect the Merger.  The
obligations of Amerin and CMAC to complete the merger are subject to the
following conditions:
 
          a.  the CMAC and Amerin stockholders having approved the merger;
 
          b.  no provision of any applicable law or regulation and no judgment,
     injunction, order or decree prohibiting the closing of the merger;
 
          c.  the registration statement of which this joint proxy
     statement/prospectus is a part not being subject to any stop order or
     related proceedings by the SEC;
 
          d.  the shares of CMAC common stock to be issued in connection with
     the merger and upon exercise of the substitute options having been approved
     for listing on the NYSE, subject to official notice of issuance; and
 
          e.  Amerin and CMAC each having received letters dated as of the
     closing date from each of Ernst & Young LLP and Deloitte & Touche LLP,
     their respective independent accountants, to the effect that the merger
     qualifies for pooling of interests accounting treatment.
 
     Conditions to the Obligations of Amerin.  The obligations of Amerin to
effect the merger are subject to the satisfaction of the following further
conditions:
 
          a.  the representations and warranties of CMAC contained in the merger
     agreement being true and correct in all material respects at and as of the
     effective time of the merger, except to the extent any such representation
     or warranty expressly speaks as of an earlier date or time;
 
          b.  the performance in all material respects by CMAC of its
     obligations and the compliance by CMAC in all material respects with its
     covenants under the merger agreement at or prior to the effective time of
     the merger;
 
          c.  Amerin having received an opinion of Davis Polk & Wardwell dated
     the closing date to the effect that the merger will be treated for United
     States federal income tax purposes as a reorganization qualifying under the
     provisions of Section 368(a) of the Internal Revenue Code and that each of
     CMAC and Amerin will be a party to the reorganization within the meaning of
     Section 368(b) of the Internal Revenue Code; and
 
          d.  there having been no downgrading of the claims-paying ability
     rating of Commonwealth Mortgage Assurance Company.
 
     Conditions to the Obligations of CMAC.  The obligations of CMAC to effect
the merger are subject to the satisfaction of the following further conditions:
 
          a.  the representations and warranties of Amerin contained in the
     merger agreement being true and correct in all material respects at and as
     of the effective time of the merger, except to the extent any such
     representation or warranty expressly speaks as of an earlier date or time;
 
          b.  the performance in all material respects by Amerin of its
     obligations and the compliance by Amerin in all material respects with its
     covenants under the merger agreement at or prior to the effective time of
     the merger;
 
                                                            THE MERGER AGREEMENT
                                       57
<PAGE>   62
 
          c.  CMAC having received an opinion of Morgan, Lewis & Bockius LLP
     dated the closing date to the effect that the merger will be treated for
     United States federal income tax purposes as a reorganization qualifying
     under the provisions of Section 368(a) of the Internal Revenue Code and
     that each of CMAC and Amerin will be a party to the reorganization within
     the meaning of Section 368(b) of the Internal Revenue Code; and
 
          d. there having been no downgrading of the claims-paying ability
     rating of Amerin Guaranty Corporation.
 
TERMINATION OF THE MERGER AGREEMENT
 
     Right to Terminate.  The merger agreement may be terminated at any time
prior to the effective time of the merger, whether before or after adoption
thereof by the stockholders of Amerin and CMAC:
 
          a.  by mutual written agreement of Amerin and CMAC;
 
          b.  if the merger is not closed by June 30, 1999;
 
          c.  if the stockholders of Amerin or CMAC reject the merger;
 
          d.  any non-appealable judgment, injunction, order or decree
     prohibiting any party from completing the merger is entered;
 
          e.  if the other party's board modifies in a manner materially adverse
     to such party its recommendation of the merger;
 
          f.  if the other party or any of its directors or officers has taken
     any of the actions that would be prohibited by its non-solicitation
     covenant; or
 
          g.  if the other party's board decides to terminate to accept an
     Amerin Superior Proposal or a CMAC Superior Proposal, as the case may be.
 
     Termination Fees.  Each party is required to pay the terminating party a
fee of $22,000,000 if the merger agreement is terminated in any of the following
circumstances:
 
          a.  if such party modifies in a manner materially adverse to the other
     party its recommendation of the merger;
 
          b.  if such party terminates to accept an Amerin Superior Proposal or
     a CMAC Superior Proposal, as the case may be; or
 
          c.  if such party breaches its non-solicitation covenant.
 
AMENDMENTS TO CMAC CERTIFICATE OF INCORPORATION
 
     The CMAC certificate of incorporation will be amended and restated as of
the effective time of the merger, by replacing articles one through eleven
thereof with the text set forth as Exhibit A to the merger agreement, which is
attached as Appendix I to this joint proxy statement/prospectus and incorporated
by reference in this document.
 
AMENDMENTS TO CMAC BYLAWS
 
     The merger agreement provides that the CMAC bylaws in effect at the
effective time will be the bylaws of the surviving corporation after the
effective time of the merger, except that:
 
- - Section 4.02 of the CMAC bylaws will be amended to provide that the size of
  the surviving corporation's board may be changed, until the surviving
  corporation's annual stockholder meeting to be held in the year 2000, only
  with the approval of two-thirds of the entire surviving corporation's board
  and, thereafter, only with the approval of a majority of the directors present
  at a meeting at which a quorum is present,
THE MERGER AGREEMENT
                                       58
<PAGE>   63
 
- - Section 4.04(a) of the CMAC bylaws will be amended to provide that vacancies
  and newly created directorships resulting from any increase in the authorized
  number of directors of the surviving corporation's board may be filled, until
  the 2000 annual meeting, only with the approval of two-thirds of the remaining
  board members and, thereafter, only with the approval of a majority of the
  remaining directors present at a meeting at which a quorum is present, and
 
- - Section 4.10(a) of the CMAC bylaws will be amended to provide that, until the
  2000 annual meeting, two-thirds of the entire surviving corporation's board
  will constitute a quorum for the transaction of business and, thereafter, a
  majority of the entire surviving corporation's board will constitute a quorum
  for the transaction of business.
 
AMENDMENTS
 
     Any provision of the merger agreement may be amended prior to the effective
time. After the adoption of the merger agreement by the stockholders of either
Amerin or CMAC, however, no amendments will be made to the merger agreement that
by law require the further approval of such stockholders without such further
approval.
 
EXPENSES
 
     All costs and expenses incurred in connection with the merger will be paid
by the party that incurs them.
 
                                                            THE MERGER AGREEMENT
                                       59
<PAGE>   64
 
                              THE SPECIAL MEETINGS
 
     CMAC and Amerin will each hold a special meeting of its stockholders. Our
boards of directors have provided you with this joint proxy statement/prospectus
in order to solicit your proxy for use at the special meetings.
 
TIMES AND PLACES; PURPOSES
 
CMAC Special Meeting
 
     CMAC will hold its special meeting at the offices of Morgan, Lewis &
Bockius LLP, 1701 Market Street, Philadelphia, Pennsylvania 19103 on June 9,
1999, starting at 10:00 a.m., local time. At the CMAC special meeting, the
stockholders of CMAC will consider and vote upon:
 
     - the CMAC merger proposal;
 
     - the plan amendment proposal; and
 
     - such other matters as may properly come before the CMAC special meeting.
 
Amerin Special Meeting
 
     Amerin will hold its special meeting at Amerin's corporate headquarters,
200 East Randolph Drive, Chicago, Illinois 60601 on June 9, 1999, starting at
9:00 a.m., local time. At the Amerin special meeting, the stockholders of Amerin
will consider and vote upon:
 
     - the Amerin merger proposal; and
 
     - such other matters as may properly come before the Amerin special
       meeting.
 
VOTING RIGHTS; VOTES REQUIRED FOR APPROVAL
 
     CMAC.  The CMAC board fixed the close of business on April 12, 1999 as the
CMAC record date for its special meeting. Only holders of record of shares of
CMAC common stock on April 12, 1999 are entitled to notice of and to vote at the
CMAC special meeting. On the CMAC record date, there were 22,727,536 shares of
CMAC common stock outstanding and entitled to vote at the CMAC special meeting
held by 62 stockholders of record.
 
     At the CMAC special meeting:
 
     - each record holder of the CMAC common stock is entitled to one vote per
       share;
 
     - the presence, in person or by proxy, of the holders of a majority of the
       outstanding shares of CMAC common stock entitled to vote at the CMAC
       special meeting is necessary to constitute a quorum for the transaction
       of business at such meeting;
 
     - adoption and approval of the CMAC merger proposal requires the
       affirmative vote of a majority of the outstanding shares of CMAC common
       stock; and
 
     - adoption and approval of the CMAC plan amendment proposal requires the
       affirmative vote of a majority of the outstanding shares of CMAC common
       stock present in person or by proxy and entitled to vote at the CMAC
       special meeting.
 
     APPROVAL OF THE CMAC MERGER PROPOSAL IS NOT CONDITIONED ON THE APPROVAL OF
THE PLAN AMENDMENT PROPOSAL. LIKEWISE, THE APPROVAL OF THE PLAN AMENDMENT
PROPOSAL IS NOT CONDITIONED ON APPROVAL OF THE MERGER PROPOSAL.
 
     Amerin.  The Amerin board fixed the close of business on April 12, 1999 as
the Amerin record date for its special meeting. Only holders of record of shares
of Amerin common stock on April 12, 1999 are entitled to notice of and to vote
at the Amerin special meeting. On the Amerin record date, there were
 
THE SPECIAL MEETINGS
                                       60
<PAGE>   65
 
26,507,768 shares of Amerin common stock outstanding and entitled to vote at the
Amerin special meeting held by 78 stockholders of record.
 
     At the Amerin special meeting:
 
     - each record holder of Amerin common stock is entitled to one vote per
       share;
 
     - the presence, in person or by proxy, of the holders of a majority of the
       outstanding shares of Amerin common stock entitled to vote at the Amerin
       special meeting is necessary to constitute a quorum for the transaction
       of business at such meeting; and
 
     - adoption and approval of the Amerin merger proposal requires the
       affirmative vote of a majority of the outstanding shares of Amerin common
       stock.
 
PROXIES
 
- - Completed Proxies.  If you complete and return a proxy and your company
  receives the proxy before or at your special meeting, your proxy will be voted
  according to your instructions.
 
- - Proxies with No Instructions.  If you execute and return a proxy but you do
  not provide instructions as to your vote, your proxy will be voted FOR the
  proposals listed on your proxy.
 
- - Proxies Marked Abstain.  If you execute and return a proxy marked ABSTAIN,
  your proxy will count for the purpose of determining whether there is a quorum
  present at your meeting and, in the case of the plan amendment proposal, for
  the purpose of determining the number of shares present in person or by proxy
  and entitled to vote at the CMAC special meeting. However, your proxy will not
  be voted. Proxies marked ABSTAIN will have the effect of a vote against each
  of the merger proposals and the plan amendment proposal.
 
- - Broker Non-Votes.  Brokers and nominees are generally precluded from
  exercising their voting discretion. Absent specific instructions from the
  beneficial owners of shares, brokers and nominees are not empowered to vote
  such shares. Accordingly, a broker non-vote will have the same effect as a
  proxy marked ABSTAIN -- it will have the effect of a vote against each of the
  merger proposals and the CMAC plan amendment proposal. Shares represented by
  broker non-votes, however, will be counted for purposes of determining whether
  there is a quorum at your special meeting.
 
- - Other Business.  We are not aware of any business for consideration at the
  special meetings other than as described in this joint proxy
  statement/prospectus. However, if matters are properly brought before the
  special meetings or any adjournments or postponements, then the persons
  appointed as proxies will have discretion to vote or act on such matters
  according to their best judgment.
 
- - Adjournments.  We may adjourn our special meetings in order to solicit
  additional proxies. Proxies marked AGAINST your company's merger proposal will
  be voted against a proposal to adjourn your special meeting for the purpose of
  soliciting additional proxies. Neither company intends to seek an adjournment
  of its special meeting.
 
- - Revocation.  You may revoke your proxy at any time before its use. To revoke
  your proxy, you must deliver to Howard Yaruss, Secretary of CMAC, or Randolph
  Sailer, Secretary of Amerin, either a signed notice of revocation or a
  later-dated signed proxy changing your vote. Alternatively, you may choose to
  attend your special meeting and vote in person.
 
- - Confidentiality of Proxies.  Our policy is to keep confidential proxy cards,
  ballots and voting tabulations that identify individual stockholders. Please
  realize, however, that disclosure of this information may be legally required.
 
- - Costs of Solicitation.  Each of us will pay our own costs associated with
  soliciting proxies from our stockholders. In addition to solicitation by mail,
  we will arrange for brokerage houses and other custodians, nominees and
  fiduciaries to send proxy materials to beneficial owners and will reimburse
 
                                                            THE SPECIAL MEETINGS
                                       61
<PAGE>   66
 
  them for reasonable expenses. To ensure sufficient representation at our
  meetings, we may request by telephone or telegram the return of your proxy
  card. Please assist us by promptly returning your proxy card without delay.
  Amerin has retained Georgeson & Company Inc. to aid in the solicitation of
  proxies and to perform services in connection with its special meeting at a
  fee of $7,500 plus expenses. CMAC has retained Corporate Investor
  Communications, Inc. to aid in the solicitation of proxies and to perform
  services in connection with its special meeting at a fee of $6,000 plus
  expenses.
 
PLEASE DO NOT SEND YOUR STOCK CERTIFICATES WITH YOUR PROXY CARD. WE WILL MAIL TO
AMERIN STOCKHOLDERS A SEPARATE TRANSMITTAL FORM WITH INSTRUCTIONS FOR THE
SURRENDER OF THEIR STOCK CERTIFICATES AS SOON AS PRACTICABLE AFTER THE
COMPLETION OF THE MERGER.
 
THE SPECIAL MEETINGS
                                       62
<PAGE>   67
 
            DIRECTORS AND MANAGEMENT OF RADIAN FOLLOWING THE MERGER
 
DIRECTORS
 
     At the effective time of the merger, CMAC and Amerin anticipate that:
 
     - The Radian board will consist of fourteen members;
 
     - Nine of the fourteen members of the Radian board will consist of persons
       designated by CMAC prior to the effective time of the merger, all of whom
       were either members of the CMAC board as of the date of the merger
       agreement or have been approved by Amerin;
 
     - Five of the fourteen members of the Radian board will consist of persons
       designated by Amerin prior to the effective time, all of whom were either
       members of the Amerin board as of the date of the merger agreement or
       have been approved by CMAC; and
 
     - The designees of CMAC and Amerin will be divided as evenly as possible
       among the three classes of the Radian board.
 
     The Radian directors are expected to include:
 
CMAC DESIGNEES
 
     HERBERT WENDER has served as Chairman of the Board of Directors of CMAC
since August 1992. He was Chairman of the Board and Chief Executive Officer of
Commonwealth Mortgage Assurance Company from June 1983 until July 1992. Mr.
Wender has been Vice Chairman and Chief Operating Officer of Land America
Financial Group, Inc. since March 1998. He was Chairman of the Board and Chief
Executive Officer of Commonwealth Land Title Insurance Company, a title
insurance company, from June 1983 until March 1998. He has been a director of
CMAC since July 1992. Age: 61.
 
     JAMES W. JENNINGS has been a partner in the Philadelphia office of the law
firm of Morgan, Lewis & Bockius LLP (which firm is counsel to CMAC) since 1970.
He has been a director of CMAC since January 1993. Age: 62.
 
     ROBERT W. RICHARDS was Chairman of the Board of Directors of Source One
Mortgage Services Corporation, a mortgage banking company, from 1989 until his
retirement in 1996. He held a number of managerial positions with Source One
from 1971 through 1996, serving as President from 1987 to 1989. He has been a
director of CMAC since November 1992. Age: 56.
 
     FRANK P. FILIPPS joined CMAC and Commonwealth Mortgage Assurance Company as
Senior Vice President and Chief Financial Officer in November 1992, and became
Executive Vice President and Chief Operating Officer of CMAC and Commonwealth
Mortgage Assurance Company in 1994. In January 1995 he became President of CMAC
and Chairman of the Board, President and Chief Executive Officer of Commonwealth
Mortgage Assurance Company. In January 1996 Mr. Filipps was named Chief
Executive Officer of CMAC. From 1975 until October 1992 he was an executive with
American International Group, Inc., an insurance holding company, serving as
Vice President and Treasurer from 1989 to 1992. He has been a director of Impac
Mortgage Holdings since November 1995 and a director of Impac Commercial
Holdings since February 1997. He has been a director of CMAC since May 1995.
Age: 51.
 
     JAMES C. MILLER was President of CMAC from July 1992 until his retirement
in December 1994. He served as President and Chief Operating Officer and a
director of Commonwealth Mortgage Assurance Company from October 1983 until
August 1992. From August 1992 through December 1994 he served as Chairman of the
Board, President and Chief Executive Officer of Commonwealth Mortgage Assurance
Company. He has been a director of CMAC since July 1992. Age: 68.
 
     ANTHONY W. SCHWEIGER is an independent consultant providing specialized
management services for turnaround situations and complex operations problems
for a variety of businesses. He served as acting Chief Executive Officer of Care
Systems in 1995. He was Managing Director of the Stafford Companies,
                                              DIRECTORS AND MANAGEMENT OF RADIAN
                                       63
<PAGE>   68
 
an investment banking firm, from November 1994 until April 1995. From November
1993 through August 1994 he served as the Executive Vice President of First
Advantage Mortgage Corporation, a mortgage banking company. Prior to that he
served as President and Chief Executive Officer of Meridian Mortgage
Corporation, a mortgage banking company, from 1987 until December 1992. He has
been a director of CMAC since November 1992. Age: 57.
 
     DAVID C. CARNEY has been the Executive Vice President of Jefferson Health
Systems since October 1996. From April 1995 until October 1996, he was Chief
Executive Officer of D.C. Carney Consulting Service. He served as Chief
Financial Officer of CoreStates Financial Corp, a banking and financial services
holding company, from April 1991 until April 1995. He has been a director of
CMAC since November 1992. Age: 61.
 
     DR. CLAIRE M. FAGIN is Dean Emerita and Professor Emerita of the School of
Nursing, University of Pennsylvania and is currently an independent consultant.
She has been associated with the University of Pennsylvania since 1977, where
she served as Interim President from 1993 to 1994. From 1977 through 1992 she
was the Dean of the School of Nursing of the University of Pennsylvania. She was
a director of Salamon Inc. from 1994 until the end of 1997, when it was acquired
by Travelers Group. She serves on the Advisory Committee of Provident Mutual
Life Insurance Company where she retired from her directorship in December 1996.
She has been a Director of CMAC since July 1994. Age: 72.
 
     RONALD W. MOORE has been an Adjunct Professor of Business Administration,
Harvard University since 1990. He is a director of Orion Capital Corporation.
Mr. Moore has been a director of CMAC since November 1992. Age: 54.
 
AMERIN DESIGNEES
 
     ROY J. KASMAR joined Amerin Guaranty as Executive Vice President and Chief
Operating Officer in May 1996 and became President and Chief Operating Officer
of Amerin Guaranty in November 1997. From 1988 to 1996 he was a member of the
Operating Committee and managing director of the Capital Markets group with
Prudential Home Mortgage. He served as Chief Operating Officer and Vice
President in charge of secondary marketing of First Boston Capital Group from
1984 to 1988. Prior to that he served as Vice President in charge of secondary
marketing of Chase Home Mortgage from 1981 to 1984. He has been a director of
Amerin Guaranty since December 1996, and a director of Amerin Corporation since
September 1998. Age: 42.
 
     LARRY E. SWEDROE has been a principal of Buckingham Asset Management, Inc.,
a personal investment advisory firm, since May 1996. From January 1994 to April
1996, he was Vice Chairman of Residential Services Corporation of America, the
holding company for Prudential Home Mortgage and Lender's Service, Inc. Prior
thereto, he served as a Managing Director of Residential Services Corporation of
America from November 1986 through December 1993. Age: 47.
 
     STEPHEN T. HOPKINS is President of Hopkins and Company LLC, a management
consulting business he formed in February 1999. From January 1976 to January
1999, he held a number of managerial positions with Freddie Mac, serving as
Senior Vice President and National Sales Director from April 1994 through August
1998. Age: 48.
 
     ROSEMARIE B. GRECO resigned her positions as President of CoreStates
Financial Corp. and as President and Chief Executive Officer of CoreStates Bank
in August 1997. She served as Chief Banking Officer of CoreStates Financial Corp
from August 1994 to June 1996, and as Chief Retail Services Officer from October
1993 to August 1994. She was a bank director from April 1992 to August 1997. She
was the President and Chief Executive Officer of CoreStates First Pennsylvania
Bank Division of CoreStates Bank from March 1991 to August 1994. Ms. Greco is
also a director of Sunoco, Inc., PECO Energy Company and Preit-Rubin Inc. Age:
51.
 
     HOWARD B. CULANG has been President of Laurel Corporation, a financial
services firm, since January 1996. He has been President of Worldstories LLC, a
development stage Internet company since February
DIRECTORS AND MANAGEMENT OF RADIAN
                                       64
<PAGE>   69
 
1999. From January 1994 through December 1995, he was as Vice Chairman of
Residential Services Corporation of America, the holding company for Prudential
Home Mortgage, Lender's Service. Inc. and Prudential Real Estate Affiliates. He
has been a director of Smart Storage Inc. since 1997. Age: 52.
 
COMMITTEES OF THE BOARD OF DIRECTORS
 
     The merger agreement provides that:
 
     - Each committee of the Radian board that does not have more than four
       members will include at least one Amerin director designee; and
 
     - Each committee of the Radian board that does have more than four members
       will include that number of Amerin director designees that corresponds to
       the proportionate representation of the Amerin director designees on the
       Radian board.
 
MANAGEMENT AND EXECUTIVE OFFICERS OF RADIAN
 
     In addition to Messrs. Filipps and Kasmar, the senior management team of
Radian following the merger is expected to include the following individuals:
 
     C. ROBERT QUINT, EXECUTIVE VICE PRESIDENT AND CHIEF FINANCIAL OFFICER.  Mr.
Quint was named Executive Vice President of CMAC and Commonwealth Mortgage
Assurance Company in April 1999. Mr. Quint was named Senior Vice President and
Chief Financial Officer of CMAC and Commonwealth Mortgage Assurance Company in
January 1996. He joined Commonwealth Mortgage Assurance Company as Vice
President, Administration and Controller in August 1990. In July 1992 he became
Vice President, Administration and Controller of CMAC. In January 1995, he was
named Vice President, Finance and Controller of CMAC and Commonwealth Mortgage
Assurance Company. From June 1987 until August 1990 he served as an Assistant
Controller for Reliance Development Group, a commercial real estate developer.
Age: 39.
 
     HOWARD S. YARUSS, SENIOR VICE PRESIDENT, SECRETARY AND GENERAL
COUNSEL.  Mr. Yaruss joined CMAC and Commonwealth Mortgage Assurance Company in
July 1997 as Senior Vice President, Secretary and General Counsel. From July
1991 until July 1997 he served as Vice President and Assistant General Counsel
of Capital Reinsurance Company, a reinsurance company. Age: 40.
 
     ALBERT V. WILL, EXECUTIVE VICE PRESIDENT, OPERATIONS.  Mr. Will has been
Executive Vice President, Operations of Amerin since August 1998. Since August
1997, he has been a Principal of Eotek, LLC and of Looking Glass Partners. He
served as Chief Operating Officer of Banc One Mortgage from November 1995
through August 1997, and Senior Vice President of Residential Services
Corporation of America from September 1989 through November 1995.
 
     WILLIAM W. CARROLL, EXECUTIVE VICE PRESIDENT, NATIONAL SALES MANAGER.  Mr.
Carroll joined CMAC and Commonwealth Mortgage Assurance Company as Senior Vice
President, National Sales Manager of CMAC in January 1997. From 1986 through
1997 he served various senior level positions within the mortgage banking
industry, most recently at Barnett Bank as a Senior Consultant. Age: 61.
 
     ANDREW R. LUCZAKOWSKY, SENIOR VICE PRESIDENT, INFORMATION SYSTEMS.  Mr.
Luczakowsky was named Senior Vice President, Information Systems of CMAC in July
1998. He was named Vice President of CMAC in April 1984. He has been employed by
CMAC in an information technology related capacity since 1982. Age: 52.
 
COMPENSATION OF DIRECTORS
 
     Directors who are employees of Radian will not receive any compensation for
service on the Radian board. The specific terms of the compensation to be paid
to non-employee directors of Radian have not yet been determined.
 
                                              DIRECTORS AND MANAGEMENT OF RADIAN
                                       65
<PAGE>   70
 
EXECUTIVE COMPENSATION
 
     The Radian board will rely on its compensation committee, which will be
composed of non-employee directors, to recommend the form and amount of
compensation to be paid to Radian's executive officers.
 
DIRECTORS AND MANAGEMENT OF RADIAN
                                       66
<PAGE>   71
 
                       COMPARISON OF STOCKHOLDERS' RIGHTS
 
     The rights of CMAC stockholders are currently governed by Delaware
corporate law and the certificate of incorporation and bylaws of CMAC. The
rights of Amerin stockholders are currently governed by Delaware corporate law
and the certificate of incorporation and bylaws of Amerin. At the effective time
of the merger, CMAC will restate its certificate of incorporation and its
bylaws, which will then be the certificate of incorporation and bylaws of
Radian. Accordingly, following the merger, the rights of CMAC stockholders and
Amerin stockholders who become stockholders of Radian in the merger will be
governed by Delaware corporate law and the certificate of incorporation and
bylaws of Radian. The following is a summary of the material differences between
the current rights of CMAC and Amerin stockholders and those of Radian
stockholders following the merger.
 
     The following discussions are not intended to be complete. You should also
refer to Delaware corporate law, the charters and bylaws of CMAC and Amerin and
the charter and bylaws of Radian. A copy of the Radian charter, as currently
proposed, is attached to this joint proxy statement/prospectus as Appendix II.
Copies of the charters and bylaws of CMAC and Amerin will be sent to their
respective stockholders upon request. See "Where You Can Find More Information."
 
COMPARISON OF CURRENT CMAC STOCKHOLDER RIGHTS AND RADIAN STOCKHOLDER RIGHTS
FOLLOWING THE MERGER
 
     Delaware corporate law will govern the rights of the holders of CMAC common
stock and Radian common stock following the merger. Any differences, therefore,
in the rights of the holders of CMAC common stock and Radian common stock arise
solely from differences between CMAC's charter and bylaws and Radian's charter
and bylaws. These differences are described below.
 
     Number of Directors
 
     CMAC's charter and bylaws provide that the total number of directors shall
be determined by the CMAC board, but shall not be less than 3 or more than 9.
This number may be increased or decreased by a vote of three quarters of the
CMAC board. Radian's charter and bylaws provide that the total number of
directors shall be determined by the Radian board, but shall not be less than 9
or more than 14. This number may be increased or decreased before Radian's
annual stockholders' meeting in 2000 only by the vote of two-thirds of the
entire Radian board. Afterwards, a majority of the entire Radian board present
at a meeting at which a quorum is present may increase or decrease the number of
directors.
 
     The merger agreement contains special provisions regarding the composition
of the Radian board and committees of the Radian board immediately following the
merger. See "Directors and Management of Radian Following the Merger."
 
     Nomination of Directors
 
     The CMAC bylaws provide that nominations by stockholders of persons for
election to the CMAC board at a stockholders' meeting must be received not less
than 14 days nor more than 50 days prior to the meeting. If less than 21 days'
notice of the meeting is given to the stockholders, then the 14-day deadline is
decreased to the earlier of the seventh day following the mailing of the notice
of the meeting and the fourth day prior to the meeting. The Radian bylaws
provide that nominations by stockholders of persons for election to the Radian
board at a stockholders' meeting must be received not less than 60 days prior to
the meeting. This 60-day deadline is decreased to 15 days if less than 75 days'
notice or prior public disclosure of the meeting date is given or made to the
stockholders.
 
     Other Stockholder Proposals
 
     The CMAC bylaws do not require advance notice for stockholder proposals
other than for nominations of directors. The Radian bylaws provide that
stockholder proposals for other businesses to be
 
                                              COMPARISON OF STOCKHOLDERS' RIGHTS
                                       67
<PAGE>   72
 
considered at the stockholder's meeting must be received not less than 60 days
prior to the meeting. This 60-day deadline is decreased to 15 days if less than
75 days' notice or prior public disclosure of the meeting date is given or made
to the stockholders.
 
COMPARISON OF CURRENT AMERIN STOCKHOLDER RIGHTS AND RADIAN STOCKHOLDER RIGHTS
FOLLOWING THE MERGER
 
     Number of Directors
 
     The Amerin charter provides that the total number of directors shall be
determined by the Amerin board, but shall not be less than 3 nor more than 16.
This number may be increased or decreased by a vote of at least 85% of the
Amerin board. Radian's charter and bylaws provide that the total number of
directors shall be determined by the Radian board, but shall not be less than 9
or more than 14. This number may be increased or decreased before Radian's
annual stockholders' meeting in 2000 only by the vote of two-thirds of the
entire Radian board. Afterwards, a majority of the entire Radian board present
at a meeting at which a quorum is present may increase or decrease the number of
directors.
 
     The merger agreement contains special provisions regarding the composition
of the Radian board and committees of the Radian board immediately following the
merger. See "Directors and Management of Radian Following the Merger."
 
     Removal of Directors
 
     Under the Amerin charter, a director can be removed:
 
- - for cause by the affirmative vote of the holders of 85% of the outstanding
  shares of Amerin common stock; or
 
- - with or without cause by the affirmative vote of the holders of a majority of
  the Amerin common stock if the stockholder or stockholders that designated
  such director voted to remove such director.
 
Radian's charter provides that a director may be removed for cause by the
affirmative vote of the holders of a majority of the shares of Radian entitled
to vote in the election of directors.
 
     Nomination of Directors
 
     Under the Amerin bylaws, an Amerin stockholder's nomination of a candidate
for director must be received no less than 60 calendar days prior to the annual
meeting of the Amerin stockholders. This 60-day deadline is decreased to 10 days
following the public announcement of the meeting date if the public announcement
is given less than 75 days prior to the meeting date. The Radian bylaws provide
that nominations by stockholders of persons for election to the Radian board at
a stockholders' meeting must be received not less than 60 days prior to the
meeting. This 60-day deadline is decreased to 15 days if less than 75 days'
notice or prior public disclosure of the meeting date is given or made to the
stockholders.
 
     Other Stockholder Proposals
 
     Amerin's bylaws provide that stockholder proposals for other business to be
considered at an annual meeting of stockholders must be received no less than 60
calendar days prior to the meeting. This 60-day deadline is decreased to 10 days
following the public announcement of the meeting date if the public announcement
is given less than 75 days prior to the meeting date. The Radian bylaws provide
that stockholder proposals for other business to be considered at a
stockholders' meeting must be received not less than 60-days prior to the
meeting. This 60 day deadline is decreased to 15 days if less than 75 days'
notice or prior public disclosure of the meeting date is given or made to the
stockholders.
 
COMPARISON OF STOCKHOLDERS' RIGHTS
                                       68
<PAGE>   73
 
     Special Meetings of Stockholders
 
     The Amerin charter and Amerin bylaws allow special meetings of the
stockholders of Amerin to be called only by the president or secretary of Amerin
and only after receipt of a written request of two-thirds of the Amerin board.
The amended Radian bylaws allow special meetings of the stockholders of Radian
to be called by the chairman of the Radian board or a majority of the directors
of the Radian board.
 
     Amendment of Charter
 
     Under the Amerin charter, the affirmative vote of the holders of 85% of the
outstanding shares of Amerin common stock is required to amend specified
material provisions of the Amerin charter. The affirmative vote of the holders
of two-thirds of the outstanding shares of Amerin common stock is required for
all other amendments to the Amerin charter. The Radian charter allows Radian to
amend the Radian charter in accordance with Delaware corporate law. Delaware
corporate law requires board approval and the affirmative vote of the holders of
a majority of the outstanding shares of Radian common stock to amend the Radian
charter.
 
     Amendment of Bylaws
 
     Under the Amerin charter, the approval of 85% of the Amerin board or of the
holders of 85% of the Amerin common stock is required to amend specified
material provisions of the Amerin bylaws. The approval of two-thirds of the
directors of the Amerin board or the affirmative vote of the holders of two-
thirds of the outstanding shares of Amerin common stock is required for all
other amendments to the Amerin bylaws. The Radian charter requires the
affirmative vote of the holders of a majority of Radian common stock if such
amendment is approved by two-thirds of the entire Radian board or the
affirmative vote of the holders of two-thirds of Radian common stock.
 
     Interested Stockholder and Fundamental Transactions
 
     The Amerin charter requires that the transactions described below with a
holder of 15% or more of Amerin's outstanding voting securities be approved by
the Amerin board and authorized by the affirmative vote of two-thirds of the
outstanding voting securities of Amerin, excluding those held by the 15% holder:
 
- - any merger or consolidation with a 15% holder;
 
- - any sale, lease or other transfer or disposition of assets with a value equal
  to 10% or more of Amerin's assets to a 15% holder;
 
- - the issuance of equity securities to a 15% holder;
 
- - any reclassification or recapitalization of Amerin, the effect of which would
  increase the percentage of outstanding Amerin equity securities owned by a 15%
  holder; or
 
- - the receipt of any loans, guarantees, pledges or other financial benefits from
  Amerin by a 15% holder.
 
     The Radian charter and bylaws do not contain any provisions relating to
transactions with 15% holders. However, the transactions described below require
approval of two-thirds of the shares entitled to vote if such transactions have
not been approved by two-thirds of the Radian board:
 
- - amendment of the Radian charter;
 
- - adoption, amendment or repeal of the Radian bylaws;
 
- - change in the number of directors constituting the entire board of directors;
 
- - removal of one or more directors;
 
                                              COMPARISON OF STOCKHOLDERS' RIGHTS
                                       69
<PAGE>   74
 
and, any of the following, if such transaction requires the approval of
stockholders under the Radian charter or Delaware corporate law, each as then in
effect:
 
- - the sale, lease, exchange or other disposition of all or substantially all of
  Radian's assets; or
 
- - the merger, consolidation, division, reorganization, recapitalization,
  dissolution, liquidation or winding up of Radian.
 
     Under Radian's charter, if two-thirds of the Radian board approves a
fundamental transaction, then such amendment requires the minimum stockholder
vote required under Delaware corporate law. Otherwise, a fundamental transaction
requires the vote of two-thirds of the shares entitled to vote.
 
COMPARISON OF STOCKHOLDERS' RIGHTS
                                       70
<PAGE>   75
 
            DESCRIPTION OF RADIAN CAPITAL STOCK FOLLOWING THE MERGER
 
     The following description summarizes the terms of the capital stock of
Radian following the merger. For further information, please read Radian's
amended and restated certificate of incorporation and Radian's amended bylaws. A
copy of Radian's amended and restated certificate of incorporation is attached
to this joint proxy statement/prospectus as Appendix II.
 
AUTHORIZED CAPITAL STOCK
 
     Radian's capital stock consists of:
 
     - 80,000,000 shares of Radian common stock, par value $.001 per share; and
 
     - 20,000,000 shares of Radian series preferred stock, par value $.001 per
       share.
 
     Following the merger:
 
     - approximately 36,894,702 shares of Radian common stock will be
       outstanding;
 
     - approximately 800,000 shares of Radian $4.125 Series Preferred Stock will
       be outstanding; and
 
     - approximately 4,777,878 shares of Radian common stock and 100,000 shares
       of Radian Series A Preferred Stock will be reserved for issuance.
 
COMMON STOCK
 
Voting
 
     - One vote per share; and
 
     - No cumulative voting.
 
Dividends
 
     - Subject to preferred stock rights, entitled to receive declared
       dividends;
 
     - The board may declare dividends out of legally available funds; and
 
     - Radian has agreed that no dividends will be paid on the Radian common
       stock at any time that the amount in the reserve account established in
       connection with the $4.125 Series Preferred Stock is less than three
       years of dividend payments on the shares of $4.125 Series Preferred Stock
       then outstanding.
 
Additional Rights
 
     - Subject to the preferred stock rights, entitled to receive assets
       remaining after payment of liabilities on a ratable basis;
 
     - No preemptive rights;
 
     - No conversion rights;
 
     - No subscription rights; and
 
     - No redemption rights.
 
                                             DESCRIPTION OF RADIAN CAPITAL STOCK
                                       71
<PAGE>   76
 
SERIES PREFERRED STOCK
 
     Radian's board can authorize series preferred stock in one or more classes
or series and fix for each class or series voting rights, preferences,
limitations and special rights, including:
 
     - dividend rights;
 
     - conversion rights;
 
     - redemption rights; and
 
     - liquidation preferences.
 
     As of the date hereof, Radian has authorized 800,000 shares of $4.125
Series Preferred Stock and 100,000 shares of Series A Preferred Stock.
 
$4.125 SERIES PREFERRED STOCK
 
     - 800,000 shares authorized, issued and outstanding;
 
     - No conversion, preemptive or other subscription rights; and
 
     - Rank senior to Radian common stock in connection with dividends and
       liquidation.
 
Dividends
 
     - Entitled to receive out of legally available funds cumulative dividends
       in the amount of $4.125 per share annually;
 
     - Dividends, which commenced on February 15, 1993, are payable quarterly in
       arrears on February 15, May 15, August 15 and November 15;
 
     - Dividends will accrue and be cumulative from the date of issuance of such
       shares;
 
     - No dividends or other distributions may be paid or set apart for payment
       on Radian common stock or any other class of capital stock ranking on a
       parity with or junior to the $4.125 Series Preferred Stock until all
       accrued and unpaid dividends on the $4.125 Series Preferred Stock are
       paid; and
 
     - Subject to limited exceptions, neither Radian nor any subsidiary may
       repurchase, redeem or otherwise acquire shares of common stock or any
       other class of capital stock ranking on a parity with or junior to the
       $4.125 Series Preferred Stock until all accrued and unpaid dividends on
       the $4.125 Series Preferred Stock are paid.
 
Redemption at the Option of Radian
 
     - Redeemable, in whole or in part, at the option of Radian at $54.125 per
       share on or after August 15, 2002, and declining to $50.00 per share on
       or after August 15, 2005, plus in each case any accumulated and unpaid
       dividends to the date fixed for redemption; and
 
     - In the event that the holders of the $4.125 Series Preferred Stock fail
       to approve any merger, consolidation, sale of assets or similar
       transaction, Radian may redeem such shares prior to August 15, 2002, at a
       redemption price of $50.00 per share plus accumulated and unpaid
       dividends, in order to proceed with such transaction.
 
Mandatory Redemption; Sinking Fund
 
     On August 15 of each year from 2002 to 2011, inclusive, Radian shall, to
the extent that it has funds legally available to redeem such shares, redeem
72,000 shares of $4.125 Series Preferred Stock at a redemption price of $50.00
per share plus accumulated and unpaid dividends. On or before each such August
15, Radian shall deposit in trust for the account of the holders of the shares
to be redeemed, as a
 
DESCRIPTION OF RADIAN CAPITAL STOCK
                                       72
<PAGE>   77
 
sinking fund, all funds necessary for the redemption of shares of $4.125 Series
Preferred Stock. Any shares of $4.125 Series Preferred Stock remaining
outstanding shall be redeemed on August 15, 2012. No dividends may be paid on
Radian common stock or any other class of capital stock ranking on a parity with
or junior to the $4.125 Series Preferred Stock and no such capital stock may be
purchased or otherwise acquired by Radian or any subsidiary if Radian has not
complied with all sinking fund and redemption obligations relating to the $4.125
Series Preferred Stock.
 
Liquidation Preference
 
     - Entitled to a liquidation preference of $50.00 per share plus any
       accumulated and unpaid dividends upon any voluntary or involuntary
       liquidation, dissolution or winding-up of Radian.
 
Voting Rights
 
     Holders of $4.125 Series Preferred Stock have no voting rights except as
described below:
 
     - If dividends on the $4.125 Series Preferred Stock are in arrears and
       unpaid for six quarterly dividends (whether consecutive or not), the
       Radian board will be increased by two directors and the holders of the
       $4.125 Series Preferred Stock will be entitled to elect two directors of
       the expanded board of directors;
 
     - Two-thirds approval of the holders of $4.125 Series Preferred Stock is
       required to complete any merger, consolidation, sale of assets or similar
       transaction on which the holders of Radian common stock are entitled to
       vote. If such approval is not obtained, Radian may redeem such shares as
       described above. Land America Financial Group, Inc., the sole holder of
       the $4.125 Series Preferred Stock, has consented to the merger described
       in this joint proxy statement/prospectus; and
 
     - Two-thirds approval of the holders of the $4.125 Series Preferred Stock
       is required to authorize or issue any shares of capital stock ranking
       senior to the $4.125 Series Preferred Stock.
 
SERIES A PREFERRED STOCK
 
     Radian has authorized 100,000 shares of Series A Preferred Stock, of which
none are issued and outstanding. The Series A Preferred Stock has no conversion,
preemptive or other subscription rights.
 
ANTI-TAKEOVER PROVISIONS
 
     The following provisions of Radian's amended and restated certificate of
incorporation, its bylaws and the statutes summarized below may have an
anti-takeover effect and may delay, defer or prevent a tender offer or takeover
attempt, including those attempts that might result in a premium over the market
price for the shares held by stockholders.
 
     The certificate of incorporation and bylaws provide for:
 
     - A classified board of directors consisting of three classes as nearly
       equal in size as possible;
 
     - That directors can only be removed for cause and only upon the vote of
       the holders of shares entitled to cast a majority of the votes which all
       stockholders are entitled to cast at an election of directors;
 
     - Preferred stock with such rights, preferences, privileges and limitations
       as may be established by the board of directors;
 
     - That stockholders may act only at an annual or special meeting or by
       unanimous written consent;
 
     - That special meetings may only be called by the chairman of the board,
       president, or a majority of the board of directors;
 
                                             DESCRIPTION OF RADIAN CAPITAL STOCK
                                       73
<PAGE>   78
 
     - unless such action is approved by two-thirds of the entire board of
       directors, that corporate actions, such as amendments to the certificate
       of incorporation and bylaws, and mergers and other business combinations,
       will require the vote of two-thirds of the outstanding voting stock,
       voting as a class. In addition, any such action must be approved by the
       holders of two-thirds of the outstanding shares of $4.125 Series
       Preferred Stock; and
 
     - Advance notice procedures with regard to the nomination, other than by or
       at the direction of the board of directors or a committee thereof, of
       candidates for election as directors. These procedures provide that the
       notice of proposed stockholder nominations for the election of directors
       must be timely given in writing to the secretary of Radian prior to the
       meeting at which directors are to be elected.
 
Stockholder Rights Plan
 
     The CMAC board of directors has adopted a stockholder rights plan. The
rights plan is designed to help insure that all stockholders of Radian receive
fair value for their shares of common stock in the event of any proposed
takeover of Radian and to guard against the use of partial tender offers or
other coercive tactics to gain control of Radian without offering fair value to
Radian's stockholders. The provisions of the rights plan may render an
unsolicited takeover of Radian more difficult or less likely to occur or might
prevent such a takeover, even though such takeover may offer Radian's
stockholders the opportunity to sell their stock at a price above the prevailing
market rate and may be favored by a majority of the stockholders of Radian.
 
     A right was issued as a dividend on each outstanding share of CMAC common
stock as of May 5, 1998. The right entitles its holder to purchase from Radian a
unit consisting of one one-thousandth of a share of the Series A Preferred
Stock, or a combination of securities and assets of equivalent value, at a
purchase price of $300, subject to adjustment. Ownership of the rights is
evidenced by certificates for common stock.
 
     Separate certificates will be issued for the rights upon the earlier of:
 
     - 10 business days following a determination by the board of directors that
       a person or group of affiliated or associated persons has acquired, or
       obtained the right to acquire, beneficial ownership of 12% or more of the
       outstanding shares of common stock; or
 
     - 10 business days following the commencement of a tender offer or exchange
       offer that would result in a person or group beneficially owning 12% or
       more of the outstanding shares of common stock.
 
     If someone acquires beneficial ownership of 12% or more of the outstanding
shares of common stock of Radian, each holder of a right will thereafter have
the right to receive, upon exercise, shares of common stock, or, upon the
determination of the Radian board, cash, property or other securities of Radian,
having a value equal to two times the exercise price of the right. Radian may
permit the holders to surrender rights with a value of 50% of what could be
purchased instead of the purchase price. All rights that are, or were,
beneficially owned by any person making such an acquisition or tender offer will
be null and void.
 
     If following one of the events set forth in the preceding paragraph, Radian
is acquired in a merger or other business combination transaction in which it is
not the surviving corporation or 50% or more of Radian's assets or earning power
is sold or transferred, each holder of a right shall thereafter have the right
to receive, upon exercise, common shares of the acquiring company having a value
equal to two times the exercise price of the right, except to the extent that
such rights have been voided. Again, provision is made to permit surrender of
the rights in exchange for one-half of the value otherwise purchasable.
 
Insurance Laws.
 
     Because Radian is an insurance holding company and, after the merger, will
have affiliated insurance companies domiciled in Pennsylvania, Texas, Arizona
and Illinois, the insurance laws of those states could
 
DESCRIPTION OF RADIAN CAPITAL STOCK
                                       74
<PAGE>   79
 
impose regulatory approval requirements on future purchases and sales of Radian
common stock. Each of these states has adopted a substantially equivalent
version of the Insurance Holding Company System Act, a model statute developed
by the National Association of Insurance Commissioners. Under the Holding
Company Act, any transaction by which a person will acquire control over an
insurance company requires a Form A filing with, and approval by, the insurance
company's domiciliary insurance regulator. A person is rebuttably presumed to
acquire control over an insurer if the transaction involves the purchase of 10%
or more of the insurer's voting securities. These statutes would apply to a
proposed purchase of 10% or more of Radian common stock and, unless a statutory
exemption were available, would require that the purchaser first make Form A
filings for approval of the purchase in each of Pennsylvania, Texas, Arizona and
Illinois. The criteria for approval in these jurisdictions are quite similar,
but would be applied separately by each domiciliary regulator relative to the
transaction's impact on the affiliated insurance company in that state. Under
the Form A filings, the proposed purchaser would have to demonstrate to the
domiciliary regulator's satisfaction that:
 
     - the transaction complies with law;
 
     - following the change in control, the affiliated insurance company would
       remain qualified for licensure;
 
     - the transaction would not substantially lessen competition in the state
       or tend to create a monopoly;
 
     - the financial condition of the purchaser will not jeopardize the
       financial stability of the affiliated insurance company or prejudice the
       interests of its policyholders;
 
     - any plan or proposals which the acquiror has to liquidate the affiliated
       insurance company, to sell its assets, to consolidate or merge it with
       any other person, to make any other material change in its business,
       corporate structure or management, or to cause the affiliated insurance
       company to enter into material agreements, arrangements or transactions
       with others, are fair and reasonable, and not prejudicial or hazardous,
       to its policyholders, and also are consistent with the public interest;
 
     - the competence, experience and integrity of those persons who control or
       manage the purchaser do not make the transaction inconsistent with the
       interests of the affiliated insurance company's policyholders or the
       public interest;
 
     - the transaction would not otherwise be hazardous or prejudicial to the
       insurance buying public; and
 
     - the transaction would not be inequitable to the affiliated insurance
       company's stockholders.
 
In addition to these Form A filing requirements, both Michigan and New Hampshire
have statutory procedures under which a licensed foreign company may be required
to requalify for continued licensure following a change in control, such as the
purchase of 10% or more of Radian common stock. Some of the Radian insurance
company affiliates will be licensed in Michigan and/or New Hampshire and
therefore could have to requalify for continued licensure following a change in
control. Finally, a few states such as California and Texas have commercially
domiciled statutes under which foreign insurers that have a stated percentage of
their total in-force business located in those states are treated as domestic
companies for Holding Company Act purposes. One consequence is that, for
transactions causing a change in control of such insurers, a Form A filing and
approval must be made in both the insurer's state of domicile and also its state
of commercial domicile. Based on current in-force statistics, it appears that
none of the Radian insurance company affiliates will be commercially domiciled
immediately following the closing of the merger. However, this could change in
the future, creating additional Form A filing and approval requirements
applicable to purchases and sales of Radian common stock.
 
PREEMPTIVE RIGHTS
 
     No holder of any shares of any class of stock of Radian will have any
preemptive or preferential right to acquire or subscribe for any unissued shares
of any class of stock or any authorized securities
 
                                             DESCRIPTION OF RADIAN CAPITAL STOCK
                                       75
<PAGE>   80
 
convertible into or carrying any right, option or warrant to subscribe for or
acquire shares of any class of stock.
 
TRANSFER AGENT AND REGISTRAR
 
     The principal transfer agent and registrar for Radian common stock after
the merger will be designated by CMAC prior to the completion of the merger.
 
STOCK EXCHANGE LISTING; DELISTING AND DEREGISTRATION OF AMERIN COMMON STOCK
 
     It is a condition to the merger that the shares of Radian common stock
issuable in connection with the merger be approved for listing on the NYSE. If
the merger is completed, Amerin common stock will cease to be listed on Nasdaq
and Amerin will cease to file periodic reports required by the Securities
Exchange Act of 1934.
 
FEDERAL SECURITIES LAWS CONSEQUENCES; STOCK TRANSFER RESTRICTION AGREEMENTS
 
     This joint proxy statement/prospectus does not cover any resales of the
Radian common stock to be received by the stockholders of Amerin upon completion
of the merger, and no person is authorized to make any use of this joint proxy
statement/prospectus in connection with any such resale.
 
     Unless you are an affiliate of Amerin, all shares of Radian common stock
received in the merger will be freely transferable. Generally, an affiliate of
Amerin is someone who is controlled by or controls Amerin and may include
officers, directors and principal stockholders of Amerin. Rules 144 and 145 of
the Securities Act of 1933 restrict the ability of Amerin affiliates to resell
their shares of Radian common stock. Amerin has received from each of its
affiliates a written agreement to the effect that such affiliates will not offer
or sell or otherwise dispose of any of the shares of Radian common stock issued
to such affiliates in the merger in violation of the Securities Act of 1933.
 
     In addition, CMAC and Amerin each have received from their affiliates
written agreements prohibiting affiliates from transferring their CMAC common
stock or Amerin common stock during the period commencing 30 days prior to the
effective time of the merger and ending at such time as financial results
covering at least 30 days of combined operations of Amerin and CMAC have been
published within the meaning of Section 201.01 of the SEC's Codification of
Financial Reporting Policies, except to the extent permitted by SEC Accounting
Series Release 135 and SEC Staff Accounting Bulletins 65 and 76.
 
DESCRIPTION OF RADIAN CAPITAL STOCK
                                       76
<PAGE>   81
 
                THE AMENDMENT TO THE CMAC INVESTMENT CORPORATION
                            EQUITY COMPENSATION PLAN
 
THE PROPOSAL
 
     The CMAC board is asking the CMAC stockholders to approve a proposal:
 
- - to authorize an additional 1,000,000 shares of CMAC common stock to be issued
  under the CMAC Investment Corporation Equity Compensation Plan; and
 
- - to increase the maximum amount of shares or rights to purchase shares that a
  grantee may receive in any calendar year under the plan from 75,000 shares to
  150,000.
 
On January 19, 1999, the CMAC board adopted this plan amendment, subject to
stockholder approval at the CMAC special meeting.
 
     THE PLAN AMENDMENT IS SET FORTH AS APPENDIX V TO THIS JOINT PROXY
STATEMENT/PROSPECTUS. THE FOLLOWING DESCRIPTION OF THE EQUITY COMPENSATION PLAN
IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO THE FULL TEXT OF THE PLAN, WHICH
CMAC HAS PREVIOUSLY FILED WITH THE SEC.
 
VOTE REQUIRED FOR APPROVAL
 
     Adoption and approval of this plan amendment requires the affirmative vote,
in person or by proxy, of a majority of shares of CMAC common stock present in
person or by proxy and entitled to vote at the CMAC special meeting. This plan
amendment is being submitted to the CMAC stockholders for approval in order to
meet Internal Revenue Code requirements for incentive stock options and for
"performance-based compensation" under Section 162(m) and NYSE requirements.
 
DESCRIPTION OF THE PLAN
 
     General.  The equity compensation plan assists CMAC in retaining and
attracting officers and other employees by offering them stock options and
awards. The amended plan authorizes up to 3,200,000 shares of CMAC common stock
for issuance, which includes the 2,200,000 shares originally authorized under
the plan (as adjusted for CMAC's 2-for-1 stock split in December 1996) and the
1,000,000 shares authorized under the plan amendment. Any shares subject to
options or stock appreciation rights granted under the plan that terminate,
expire or cancel without being exercised, and any shares of restricted stock or
phantom stock that are forfeited, will become available for reissuance under the
plan.
 
     Administration of the Equity Compensation Plan.  The stock option and
compensation committee or another committee appointed by the CMAC board will
administer and interpret the plan. This committee shall consist of two or more
persons appointed by the CMAC board from among its non-employee members. The
committee has the sole authority to determine:
 
- - the employees to whom options and/or awards will be granted under the plan;
 
- - the type, size and terms of the options and/or awards;
 
- - when the options and/or awards will be granted and the duration of the
  exercise period; and
 
- - any other matters arising under the plan.
 
     Grants.  Incentives under the CMAC equity compensation plan consist of
incentive stock options within the meaning of Section 422 of the Internal
Revenue Code, non-qualified stock options, restricted stock grants, stock
appreciation rights and phantom stock.
 
     Eligibility for Participation.  Officers and other employees of CMAC or an
affiliate are eligible to participate in the plan. Non-employee directors are
eligible to participate in the plan, but are not permitted to receive grants of
incentive stock options, or ISOs. At May 5, 1999, 8 executive officers and
approximately 600 employees were eligible to participate in the plan. The
committee selects the grantees
                                                              THE PLAN AMENDMENT
                                       77
<PAGE>   82
 
and determines the number of shares of CMAC common stock subject to each grant.
Under the amended plan, no grantee may receive options (and related stock
appreciation rights) for more than 150,000 shares of CMAC common stock for any
calendar year.
 
     Term, Purchase Price, Vesting and Method of Exercise.  The exercise price
of CMAC common stock subject to an ISO is its fair market value on the date the
option is granted. The exercise price of CMAC common stock subject to a
non-qualified stock option, or NQSO, is determined by the committee, but may not
be less than 90% of its fair market value on the date the option is granted.
 
     The committee determines the term for each option, up to a ten year
maximum. Unless otherwise specified in the grant letter, each option shall vest
ratably over four years, beginning two years after the date of grant.
Specifically, if the grantee remains with CMAC, the grantee may exercise this
option as follows:
 
- - as of the second anniversary of the grant, 25% of the shares underlying the
  option;
 
- - as of the third anniversary of the grant, another 25% of the shares underlying
  the option;
 
- - as of the fourth anniversary of the grant, another 25% of the shares
  underlying the option;
 
- - as of the fifth anniversary of the grant, the remaining shares underlying the
  option.
 
     If not sooner vested, each option shall fully vest upon the earliest of:
 
- - the grantee's normal retirement date;
 
- - five years from the date of the grant;
 
- - the grantee's death or disability; or
 
- - the occurrence of a change of control of CMAC.
 
A grantee may pay the option price in cash or, with the committee's consent,
shares of CMAC common stock.
 
     Restricted Stock Grants.  The committee may issue shares of CMAC common
stock under a grant of restricted stock under the plan. If a grantee's
employment terminates while the shares are subject to restrictions imposed by
the committee, the restricted stock grant will terminate with respect to all
shares that are subject to restrictions, and such shares must be immediately
returned to CMAC. While shares are subject to restrictions, a grantee may not
sell, assign, transfer, pledge or otherwise dispose of the shares of CMAC common
stock, except to a successor grantee in the event of the grantee's death. All
restrictions imposed under a restricted stock grant lapse after the applicable
restriction period or as the committee may determine.
 
     Stock Appreciation Rights.  The committee may grant SARs to any grantee in
tandem with a stock option, for all or a portion of the applicable option,
either when the option is granted or, in the case of an NQSO, at any time
thereafter while the option remains outstanding. Upon the exercise of an option,
the SARs relating to the CMAC common stock covered by such option terminate.
Upon the exercise of SARs, the related option terminates to the extent of an
equal number of shares of CMAC common stock.
 
     Upon a grantee's exercise of some or all of his SARs, the grantee receives
in settlement of such SARs an amount equal to the value of the stock
appreciation for the number of SARs exercised, payable in cash, CMAC common
stock or a combination thereof. The stock appreciation for an SAR is the
difference between the exercise price as described below and the fair market
value of the underlying
 
THE PLAN AMENDMENT
                                       78
<PAGE>   83
 
CMAC common stock on the date of exercise of the SAR. The plan provides that the
exercise price of a SAR is either:
 
- - the option price of the related stock option; or
 
- - the fair market value of a share of CMAC common stock as of the date of grant
  of the SAR, if the SAR is granted after the stock option and an exercise price
  equal to the option price would result in the disallowance of CMAC's expense
  deduction upon exercise of the SAR under Section 162(m) of the Internal
  Revenue Code.
 
     An SAR is exercisable only for so long as the related option is also
exercisable.
 
     Phantom Stock.  The committee may grant phantom stock, which entitles the
grantee to receive shares of CMAC common stock at a conversion date established
by the committee. The phantom stock may be subject to vesting restrictions or no
vesting, as the committee determines. All phantom stock will be paid in whole
shares of CMAC common stock, with fractional shares paid in cash.
 
     Amendment and Termination of the Plan.  The CMAC board may amend or
terminate the equity compensation plan at any time. However, the following
amendments are subject to approval of CMAC stockholders:
 
- - any amendment that materially increases the benefits accruing to participants
  under the plan;
 
- - any amendment that increases the aggregate number, or individual limit for any
  grantee, of shares of CMAC common stock that may be issued or transferred
  under the plan;
 
- - any amendment that materially modifies the requirements as to eligibility for
  participation; or
 
- - any amendment that modifies the provisions for determining fair market value
  of CMAC common stock.
 
The plan will terminate on January 1, 2005 unless terminated earlier by the CMAC
board or extended by the CMAC board with approval of the stockholders.
 
     Amendment and Termination of Outstanding Grants.  A termination or
amendment of the plan that occurs after a grant is made will not terminate or
amend the grant unless the grantee consents or unless the committee revokes a
grant that is contrary to applicable law.
 
     Adjustment Provisions; Change of Control of CMAC.  The number or kind of
shares of CMAC common stock may change as a result of:
 
- - the declaration of stock dividends;
 
- - a recapitalization, stock split, or combinations or exchanges of such shares;
 
- - merger, recapitalization or consolidation of CMAC;
 
- - reclassification or change in the par value; or
 
- - by reason of another extraordinary or unusual event.
 
  If that happens, the number of shares of CMAC common stock available for
  grants, the number of such shares covered by outstanding grants and the price
  per share or the applicable market value of such grants will be
  proportionately adjusted by the committee to reflect any increase or decrease
  in the number or kind of issued shares of CMAC common stock.
 
     If a change of control of CMAC occurs:
 
- - all options outstanding under the plan will become immediately vested and
  exercisable; and
 
- - all restrictions on outstanding restricted stock and phantom stock grants will
  immediately lapse.
 
                                                              THE PLAN AMENDMENT
                                       79
<PAGE>   84
 
A change of control of CMAC occurs when:
 
- - a person or group, other than CMAC, one of its affiliates or one of its
  employee benefit plans acquires 20% or more of the shares of CMAC then
  outstanding and entitled to vote for directors generally, or acquires
  substantially all of the assets of CMAC; or
 
- - during any 24-month period, there is a change in the majority of the CMAC
  board, unless at least 75% of the individuals who were directors at the
  beginning of the 24-month period approve the election or nomination of at
  least 75% of the new directors.
 
FEDERAL INCOME TAX CONSEQUENCES
 
     The following general discussion summarizes the United States federal
income tax consequences relating to grants made under the equity compensation
plan. Grantees are urged to consult with their personal tax advisors concerning
the application of the principles discussed below to their own situations and
the application of state and local tax laws.
 
     Non-Qualified Stock Options.  There are no federal income tax consequences
to grantees or to CMAC upon the grant of an NQSO. Upon the exercise of NQSOs,
grantees will recognize ordinary compensation income in an amount equal to the
excess of the fair market value of the shares when exercised over the exercise
price of the NQSO. CMAC generally will be entitled to a corresponding income tax
deduction. Upon the sale of shares acquired by exercise of an NQSO, a grantee
will have a long-term or short-term capital gain or loss in an amount equal to
the difference between the amount realized upon the sale and the exercise price,
plus the amount of ordinary income recognized by the grantee when the NQSO is
exercised.
 
     Incentive Stock Options.  Grantees will not be subject to income taxation
upon the grant or exercise of ISOs, and CMAC will not be entitled to an income
tax deduction by reason of such grant or exercise. However, the amount by which
the fair market value of the shares when exercised exceeds the option price is
an item of tax preference subject to the alternative minimum tax applicable to
the person exercising the ISO. If the grantee sells shares acquired by exercise
of an ISO more than one year after the exercise and two years after the grant of
the ISO, the grantee will recognize long-term capital gain or loss in the amount
of the difference between the amount realized on the sale and the option price
and CMAC will not be entitled to any tax deduction.
 
     If such sale occurs within one year from the date of exercise of the ISO or
within two years from the date of grant, the grantee generally will recognize
ordinary compensation income equal to the lesser of the excess of the fair
market value of the shares on the date of exercise over the option price, or the
excess of the amount realized on the sale of the shares over the option price.
 
     Any amount realized on a sale within one year from the date of exercise of
the ISO or within two years from the date of grant in excess of the amount
treated as ordinary compensation income (or any loss realized) will be a
long-term or a short-term capital gain (or loss), depending upon the length of
time the shares were held. CMAC generally will be entitled to a tax deduction on
such sale corresponding to the ordinary compensation income recognized by the
grantee.
 
     Restricted Stock.  A grantee normally will not recognize taxable income
upon the award of a restricted stock grant, and CMAC will not be entitled to a
deduction, until such stock is transferable by the grantee or no longer subject
to a substantial risk of forfeiture, whichever occurs earlier. When the CMAC
common stock is either transferable or is no longer subject to a substantial
risk of forfeiture, the grantee will recognize ordinary compensation income in
an amount equal to the difference between the fair market value of the CMAC
common stock at that time and the amount paid by the grantee for the shares, if
any, or the grantee's other tax basis in the shares. CMAC will be entitled to a
deduction in the same amount. A participant may, however, elect to recognize
ordinary compensation income in the year the restricted stock grant is awarded
in an amount equal to the difference between the fair market value of the CMAC
common stock at that time, determined without regard to the restrictions, and
the amount
THE PLAN AMENDMENT
                                       80
<PAGE>   85
 
paid by the grantee for the shares, if any. In this event, CMAC generally will
be entitled to a deduction in the same year. Any gain or loss recognized by the
grantee upon subsequent disposition of the CMAC common stock will be capital
gain or loss. If, after making the election, any CMAC common stock subject to a
restricted stock grant is forfeited, or if the market value declines during the
restriction period, the grantee is not entitled to any tax deduction or tax
refund.
 
     Stock Appreciation Rights.  The grantee will not recognize any income upon
the grant of a SAR. Upon the exercise of a SAR, the grantee will recognize
ordinary compensation income in the amount of the cash and the fair market value
of the shares of CMAC common stock received upon such exercise. CMAC generally
is entitled to a corresponding deduction.
 
     Phantom Stock.  The grantee will not recognize income upon the grant of
phantom stock. Upon the conversion of phantom stock, the grantee will recognize
ordinary compensation income equal to the fair market value of the shares of
CMAC common stock and the cash received. CMAC generally is entitled to a
corresponding deduction.
 
     Section 162(m).  The equity compensation plan is intended to make grants of
ISOs, NQSOs with an exercise price not less than fair market value at the date
of grant, and related SARs meet the requirements of performance-based
compensation within the meaning of Section 162(m) of the Internal Revenue Code.
 
                                                              THE PLAN AMENDMENT
                                       81
<PAGE>   86
 
                                 LEGAL MATTERS
 
     The validity of the Radian common stock to be issued in connection with the
merger will be passed upon by Morgan, Lewis & Bockius LLP, special counsel to
CMAC.
 
                            INDEPENDENT ACCOUNTANTS
 
     The consolidated financial statements and schedules of Amerin Corporation
and subsidiaries as of December 31, 1998 and 1997, and for each of the three
years in the period ended December 31, 1998, incorporated by reference in this
joint proxy statement/prospectus have been audited by Ernst & Young LLP,
independent auditors, as set forth in their reports incorporated by reference in
this joint proxy statement/prospectus in reliance upon such reports given upon
the authority of such firm as experts in accounting and auditing.
 
     The consolidated financial statements and the related financial statement
schedules of CMAC Investment Corporation and subsidiaries incorporated in this
joint proxy statement/prospectus by reference from the Annual Report on Form
10-K of CMAC Investment Corporation for the year ended December 31, 1998, have
been audited by Deloitte & Touche LLP, independent auditors, as stated in their
reports which are incorporated by reference in this joint proxy
statement/prospectus, and have been so incorporated in reliance upon the reports
of such firm.
 
LEGAL MATTERS/INDEPENDENT ACCOUNTANTS
                                       82
<PAGE>   87
 
                          FUTURE STOCKHOLDER PROPOSALS
 
     Any CMAC stockholder who intended to submit a proposal for inclusion in the
proxy materials for the 1999 annual meeting of CMAC should have submitted such
proposal to the secretary of CMAC by December 4, 1998. Stockholders who intended
to submit proposals appropriate for stockholder action at the 1999 annual
meeting of CMAC, but who were not seeking to have the proposal included in the
proxy statement, should have submitted such proposal so that it would have been
received by CMAC no later than February 20, 1999. In addition, the CMAC bylaws
provide that any stockholder wishing to make a nomination for director at the
1999 annual meeting of CMAC must give at least 14 days advance notice, subject
to limited exceptions, and that notice must meet other requirements set forth in
the current CMAC bylaws. A copy of the applicable CMAC bylaws may be obtained
from the secretary of CMAC. The provisions in the CMAC bylaws relevant to the
foregoing will be amended in the bylaws of Radian. Please see "Comparison of
Stockholders' Rights -- Comparison of Current CMAC Stockholders Rights and
Radian Stockholder Rights Following the Merger."
 
     If the merger is not completed by the end of June 1999, Amerin expects to
hold an annual meeting of stockholders in the second quarter of 1999. SEC rules
set forth standards as to what stockholder proposals are required to be included
in a proxy statement. Any Amerin stockholder who intends to submit a proposal
for inclusion in the proxy materials for the 1999 annual meeting of Amerin must
submit such proposal to the secretary of Amerin by December 31, 1998. In
addition, the Amerin bylaws provide that any Amerin stockholder wishing to make
a nomination for director, or wishing to introduce a proposal on other business,
at the 1999 annual meeting of Amerin must notify the secretary of Amerin of the
stockholders' intentions and provide other information in advance of such
meeting. The procedures for doing so are detailed in the Amerin bylaws. A copy
of the Amerin bylaws may be obtained from the secretary of Amerin.
 
                                                    FUTURE STOCKHOLDER PROPOSALS
                                       83
<PAGE>   88
 
                      WHERE YOU CAN FIND MORE INFORMATION
 
     CMAC and Amerin file annual, quarterly and special reports, proxy
statements and other information with the SEC. You may read and copy any
reports, statements or other information we file at the SEC's public reference
rooms in Washington, D.C., New York, New York and Chicago, Illinois. Please call
the SEC at 1-800-732-0330 for further information on the public reference rooms.
Our SEC filings are also available to the public from commercial document
retrieval services and at the web site maintained by the SEC at
http://www.sec.gov.
 
     CMAC filed a Registration Statement on Form S-4 to register with the SEC
the CMAC common stock to be issued to Amerin stockholders in the merger. This
joint proxy statement/prospectus constitutes a prospectus of CMAC in addition to
being a joint proxy statement of CMAC and Amerin. As allowed by SEC rules, this
joint proxy statement/prospectus does not contain all the information you can
find in the Registration Statement or the exhibits to the Registration
Statement.
 
     The SEC allows us to "incorporate by reference," which means that we can
disclose important information to you by referring you to another document filed
separately with the SEC. The information incorporated by reference is deemed to
be part of this joint proxy statement/prospectus, except for any information
superseded by information in this joint proxy statement/prospectus. This joint
proxy statement/prospectus incorporates by reference the documents set forth
below that we have previously filed with the SEC. These documents contain
important information about our companies and their finances.
 
<TABLE>
<CAPTION>
         CMAC SEC FILINGS                                  PERIOD
         ----------------                                  ------
<S>                                  <C>
Annual Report on Form 10-K/A         Year ended December 31, 1998 (filed on May 6,
                                       1999)
Registration Statement on Form 8-A   Filed on August 24, 1992
        AMERIN SEC FILINGS                                 PERIOD
- -----------------------------------  --------------------------------------------------
Annual Report on Form 10-K/A         Year ended December 31, 1998 (filed on May 6,
                                       1999)
Registration Statement on Form 8-A   Filed on November 3, 1995
</TABLE>
 
     We are also incorporating by reference additional documents that we file
with the SEC under sections 13(a), 13(c), 14 or 15(d) of the Securities Exchange
Act of 1934 between the date of this joint proxy statement/prospectus and the
dates of the special meetings.
 
     CMAC has supplied all information contained or incorporated by reference in
this joint proxy statement/prospectus relating to CMAC and Amerin has supplied
all such information relating to Amerin.
 
     If you are a stockholder, we may have sent you some of the documents
incorporated by reference, but you can obtain any of them through us or the SEC.
You may obtain documents incorporated by reference without charge by writing or
calling the appropriate party at the following addresses:
 
<TABLE>
<S>                                        <C>
CMAC Investment Corporation                Amerin Corporation
Attention: Secretary                       Attention: Secretary
1601 Market Street                         200 East Randolph Drive, 49th Floor
Philadelphia, PA 19103                     Chicago, Illinois 60601-7125
Tel: 215-564-6600                          Tel: 312-540-0078
</TABLE>
 
     If you would like to request documents from us, please do so by June 1,
1999 to receive them before the special meetings.
 
WHERE YOU CAN FIND MORE INFORMATION
                                       84
<PAGE>   89
 
     YOU SHOULD RELY ONLY ON THE INFORMATION CONTAINED OR INCORPORATED BY
REFERENCE IN THIS JOINT PROXY STATEMENT/PROSPECTUS TO VOTE ON THE MERGER. WE
HAVE NOT AUTHORIZED ANYONE TO PROVIDE YOU WITH INFORMATION THAT IS DIFFERENT
FROM WHAT IS CONTAINED IN THIS JOINT PROXY STATEMENT/PROSPECTUS. THIS JOINT
PROXY STATEMENT/PROSPECTUS IS DATED MAY 6, 1999. YOU SHOULD NOT ASSUME THAT THE
INFORMATION CONTAINED IN THE JOINT PROXY STATEMENT/PROSPECTUS IS ACCURATE AS OF
ANY DATE OTHER THAN SUCH DATE, AND NEITHER THE MAILING OF THE JOINT PROXY
STATEMENT/PROSPECTUS TO STOCKHOLDERS NOR THE ISSUANCE OF CMAC COMMON STOCK IN
THE MERGER SHALL CREATE ANY IMPLICATION TO THE CONTRARY.
 
                                             WHERE YOU CAN FIND MORE INFORMATION
                                       85
<PAGE>   90
 
                                                                      APPENDIX I
 
                          AGREEMENT AND PLAN OF MERGER
 
                                  dated as of
 
                               November 22, 1998*
 
                                    between
 
                               AMERIN CORPORATION
 
                                      and
 
                          CMAC INVESTMENT CORPORATION
 
- ---------------
* Text of Appendix I reflects the text of the Amendment No. 1 to Agreement and
  Plan of Merger, dated as of April 5, 1999, but the Agreement and Plan of
  Merger, dated as of November 22, 1998, has not been amended and restated.
<PAGE>   91
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                             PAGE
                                                                             ----
<S>             <C>                                                          <C>
                                    ARTICLE 1
                                   THE MERGER
SECTION 1.01.   The Merger..................................................  I-1
SECTION 1.02.   Conversion of Shares........................................  I-2
SECTION 1.03.   CMAC Stock..................................................  I-2
SECTION 1.04.   Surrender and Payment.......................................  I-2
SECTION 1.05.   Stock Options and Restricted Stock..........................  I-3
SECTION 1.06.   Adjustments.................................................  I-4
SECTION 1.07.   Fractional Shares...........................................  I-4
SECTION 1.08.   Withholding Rights..........................................  I-4
SECTION 1.09.   Lost Certificates...........................................  I-4
 
                                    ARTICLE 2
                            THE SURVIVING CORPORATION
SECTION 2.01.   Certificate of Incorporation................................  I-4
SECTION 2.02.   Bylaws......................................................  I-4
SECTION 2.03.   Board and Board Committees of the Surviving Corporation.....  I-5
SECTION 2.04.   Management..................................................  I-5
SECTION 2.05.   Headquarters................................................  I-5
 
                                    ARTICLE 3
                    REPRESENTATIONS AND WARRANTIES OF AMERIN
SECTION 3.01.   Corporate Existence and Power...............................  I-5
SECTION 3.02.   Corporate Authorization.....................................  I-5
SECTION 3.03.   Governmental Authorization..................................  I-6
SECTION 3.04.   Non-Contravention...........................................  I-6
SECTION 3.05.   Capitalization..............................................  I-6
SECTION 3.06.   Assets Necessary............................................  I-7
SECTION 3.07.   Subsidiaries................................................  I-7
SECTION 3.08.   Licenses and Permits; Policies; Regulatory Matters..........  I-7
SECTION 3.09.   SEC Filings.................................................  I-8
SECTION 3.10.   Financial Statements........................................  I-8
SECTION 3.11.   Registration Statement; Joint Proxy Statement...............  I-9
SECTION 3.12.   Absence of Certain Changes or Events........................  I-9
SECTION 3.13.   Material Liabilities; Investments...........................  I-9
SECTION 3.14.   Compliance with Laws and Court Orders....................... I-10
SECTION 3.15.   Material Contracts.......................................... I-10
SECTION 3.16.   Non-Claims Litigation....................................... I-11
SECTION 3.17.   Reserves; Reinsurance....................................... I-11
SECTION 3.18.   Loans and Advances.......................................... I-12
SECTION 3.19.   Finders' Fees............................................... I-12
SECTION 3.20.   Opinion of Financial Advisor................................ I-12
SECTION 3.21.   Taxes....................................................... I-12
SECTION 3.22.   Employee Benefit Plans...................................... I-13
SECTION 3.23.   Environmental Matters....................................... I-14
SECTION 3.24.   Intellectual Property; Software............................. I-14
SECTION 3.25.   Properties.................................................. I-15
SECTION 3.26.   Pooling; Tax Treatment...................................... I-15
</TABLE>
<PAGE>   92
 
<TABLE>
<CAPTION>
                                                                             PAGE
                                                                             ----
<S>             <C>                                                          <C>
SECTION 3.27.   Takeover Statutes........................................... I-16
SECTION 3.28.   Transactions with Affiliates................................ I-16
SECTION 3.29.   Business Information........................................ I-16
SECTION 3.30.   Year 2000................................................... I-16
SECTION 3.31.   Rights Agreement............................................ I-16
 
                                    ARTICLE 4
                     REPRESENTATIONS AND WARRANTIES OF CMAC
SECTION 4.01.   Corporate Existence and Power............................... I-16
SECTION 4.02.   Corporate Authorization..................................... I-17
SECTION 4.03.   Governmental Authorization.................................. I-17
SECTION 4.04.   Non-Contravention........................................... I-17
SECTION 4.05.   Capitalization.............................................. I-17
SECTION 4.06.   Assets Necessary............................................ I-18
SECTION 4.07.   Subsidiaries................................................ I-18
SECTION 4.08.   Licenses and Permits; Policies; Regulatory Matters.......... I-18
SECTION 4.09.   SEC Filings................................................. I-19
SECTION 4.10.   Financial Statements........................................ I-19
SECTION 4.11.   Registration Statement; Joint Proxy Statement............... I-20
SECTION 4.12.   Absence of Certain Changes or Events........................ I-20
SECTION 4.13.   Material Liabilities; Investments........................... I-20
SECTION 4.14.   Compliance with Laws and Court Orders....................... I-20
SECTION 4.15.   Material Contracts.......................................... I-20
SECTION 4.16.   Non-Claims Litigation....................................... I-22
SECTION 4.17.   Reserves; Reinsurance....................................... I-22
SECTION 4.18.   Loans and Advances.......................................... I-23
SECTION 4.19.   Finders' Fees............................................... I-23
SECTION 4.20.   Opinion of Financial Advisor................................ I-23
SECTION 4.21.   Taxes....................................................... I-23
SECTION 4.22.   Employee Benefit Plans...................................... I-23
SECTION 4.23.   Environmental Matters....................................... I-24
SECTION 4.24.   Intellectual Property; Software............................. I-25
SECTION 4.25.   Properties.................................................. I-25
SECTION 4.26.   Pooling; Tax Treatment...................................... I-25
SECTION 4.27.   Takeover Statutes........................................... I-26
SECTION 4.28.   Transactions with Affiliates................................ I-26
SECTION 4.29.   Business Information........................................ I-26
SECTION 4.30.   Year 2000................................................... I-26
SECTION 4.31.   Rights Agreement............................................ I-26
 
                                    ARTICLE 5
                                    COVENANTS
SECTION 5.01.   Conduct of Amerin........................................... I-26
SECTION 5.02.   Conduct of CMAC............................................. I-28
SECTION 5.03.   Stockholder Meetings; Proxy Materials; Form S-4............. I-30
SECTION 5.04.   Director and Officer Liability.............................. I-31
SECTION 5.05.   Registration of Substitute Option Shares.................... I-32
SECTION 5.06.   Stock Exchange Listing...................................... I-32
SECTION 5.07.   Employee Benefits........................................... I-32
</TABLE>
 
                                       ii
<PAGE>   93
 
<TABLE>
<CAPTION>
                                                                             PAGE
                                                                             ----
<S>             <C>                                                          <C>
SECTION 5.08.   Access to Information....................................... I-32
SECTION 5.09.   Non-Solicitation by Amerin; Other Offers for Amerin......... I-32
SECTION 5.10.   Non-Solicitation by CMAC; Other Offers for CMAC............. I-33
SECTION 5.11.   Notices of Certain Events................................... I-34
SECTION 5.12.   Appropriate Action; Consents; Filings....................... I-35
SECTION 5.13.   Cooperation................................................. I-35
SECTION 5.14.   Public Announcements........................................ I-35
SECTION 5.15.   Affiliates; Pooling of Interests; Reorganization............ I-36
SECTION 5.16.   Takeover Statutes........................................... I-36
SECTION 5.17.   Employment Agreement........................................ I-36
 
                                    ARTICLE 6
                            CONDITIONS TO THE MERGER
SECTION 6.01.   Conditions to the Obligations of Each Party................. I-36
SECTION 6.02.   Conditions to the Obligations of CMAC....................... I-37
SECTION 6.03.   Conditions to the Obligations of Amerin..................... I-37
 
                                    ARTICLE 7
                                   TERMINATION
SECTION 7.01.   Termination................................................. I-38
SECTION 7.02.   Effect of Termination....................................... I-40
SECTION 7.03.   Certain Fees................................................ I-40
 
                                    ARTICLE 8
                                  MISCELLANEOUS
SECTION 8.01.   Notices..................................................... I-40
                Nonsurvival of Representations, Warranties, Covenants and
SECTION 8.02.   Agreements.................................................. I-41
SECTION 8.03    Amendments; No Waivers...................................... I-41
SECTION 8.04.   Expenses.................................................... I-41
SECTION 8.05.   Successors and Assigns...................................... I-41
SECTION 8.06.   Governing Law............................................... I-42
SECTION 8.07.   Jurisdiction................................................ I-42
SECTION 8.08.   Waiver of Jury Trial........................................ I-42
SECTION 8.09.   Counterparts; Effectiveness................................. I-42
SECTION 8.10.   Entire Agreement............................................ I-42
SECTION 8.11.   Captions.................................................... I-42
SECTION 8.12.   Severability................................................ I-42
SECTION 8.13.   Specific Performance........................................ I-42
SECTION 8.14.   Definitions and Usage....................................... I-42
 
Amerin Schedule of Exceptions
CMAC Schedule of Exceptions
 
Exhibit A       Certificate of Incorporation
Exhibit B-1     Affiliate's Letter (CMAC)
Exhibit B-2     Affiliate's Letter (Amerin)
Exhibit C       Tax Opinion of Morgan, Lewis & Bockius
Exhibit D       Tax Opinion of Davis Polk & Wardwell
Exhibit E-1     Amerin Tax Representation Letter
Exhibit E-2     CMAC Tax Representation Letter
Exhibit F       Employment Agreement
</TABLE>
 
                                       iii
<PAGE>   94
 
                          AGREEMENT AND PLAN OF MERGER
 
     AGREEMENT AND PLAN OF MERGER (this "AGREEMENT") dated as of November 22,
1998* between Amerin Corporation, a Delaware corporation ("AMERIN"), and CMAC
Investment Corporation, a Delaware corporation ("CMAC").
 
                              W I T N E S S E T H
 
     WHEREAS, the Boards of CMAC and Amerin deem it advisable and in the best
interests of each corporation and its respective stockholders that CMAC and
Amerin enter into a strategic business combination in order to advance the
long-term business interests of CMAC and Amerin, and have therefore declared
this Agreement to be advisable and approved this Agreement, the Merger (as
hereinafter defined) and the other transactions contemplated by this Agreement;
and
 
     WHEREAS, the combination of CMAC and Amerin shall be effected by the terms
of this Agreement through a transaction in which Amerin will merge with and into
CMAC, CMAC will continue as the surviving corporation and the stockholders of
Amerin will become stockholders of CMAC, which will be renamed a name mutually
agreed upon between the parties prior to Closing (as hereinafter defined); and
 
     WHEREAS, for Federal income tax purposes, it is intended that the Merger
shall qualify as a reorganization under the provisions of Section 368(a) of the
Internal Revenue Code of 1986, as amended (the "CODE"); and
 
     WHEREAS, for financial accounting purposes, it is intended that the Merger
will be accounted for as a pooling of interests transaction; and
 
     WHEREAS, CMAC and Amerin desire to make certain representations,
warranties, covenants and agreements in connection with this Agreement;
 
     NOW, THEREFORE, in consideration of the representations, warranties,
covenants and agreements contained in this Agreement, and intending to be
legally bound, the parties agree as follows:
 
                                   ARTICLE 1
 
                                   THE MERGER
 
     SECTION 1.01. The Merger. (a) At the Effective Time, Amerin shall be merged
(the "MERGER") with and into CMAC in accordance with the General Corporation Law
of the State of Delaware ("DELAWARE LAW"), whereupon the separate existence of
Amerin shall cease, and CMAC shall continue as the surviving corporation (the
"SURVIVING CORPORATION").
 
     (b) The closing of the Merger (the "CLOSING") shall take place at 10:00
a.m. on a date to be specified by the parties (the "CLOSING DATE"), which date
shall be no later than the second business day after satisfaction of the
conditions set forth in Article 6, at the offices of Morgan, Lewis & Bockius
LLP, 1701 Market Street, Philadelphia, PA 19103, unless another time, date or
place is agreed in writing by the parties hereto.
 
     (c) Upon the Closing, Amerin and CMAC will file a certificate of merger
(the "CERTIFICATE OF MERGER") with the Delaware Secretary of State and make all
other filings or recordings required by Delaware Law in connection with the
Merger. The Merger shall become effective at such time (the "EFFECTIVE TIME") as
the Certificate of Merger is duly filed with the Delaware Secretary of State (or
at
 
- ---------------
* Text of Appendix I reflects the text of the Amendment No. 1 to Agreement and
  Plan of Merger, dated as of April 5, 1999, but the Agreement and Plan of
  Merger, dated as of November 22, 1998, has not been amended and restated.
<PAGE>   95
 
such later time as may be agreed in writing by the parties hereto and specified
in the Certificate of Merger).
 
     (d) From and after the Effective Time, the Surviving Corporation shall
possess all the rights, powers, privileges and franchises and be subject to all
of the obligations, liabilities, restrictions and disabilities of Amerin and
CMAC, all as provided under Delaware Law.
 
SECTION 1.02. Conversion of Shares. At the Effective Time:
 
     (a) each share of common stock, par value $.01 per share, of Amerin
outstanding immediately prior to the Effective Time (the "AMERIN STOCK"),
together with the preferred share purchase rights issued to the holders thereof
pursuant to that certain Rights Agreement (the "AMERIN RIGHTS AGREEMENT") dated
as of October 14, 1998 between Amerin and Norwest Bank Minnesota, National
Association (the "AMERIN STOCKHOLDER RIGHTS") and attached thereto, shall
(except as otherwise provided in Section 1.02(b) and subject to Section 1.07) be
converted into the right to receive .5333 (the "EXCHANGE RATIO") fully paid and
nonassessable shares of the common stock, par value $.001 per share, of CMAC
(the "CMAC STOCK"), together with the same number of preferred share purchase
rights issued to the holders thereof pursuant to that certain Rights Agreement
(the "CMAC RIGHTS AGREEMENT") dated as of April 14, 1998 between CMAC and The
Bank of New York (the "CMAC STOCKHOLDER RIGHTS") and attached thereto, subject
to adjustment as provided in Section 1.06 (the "MERGER CONSIDERATION"); and
 
     (b) each share of Amerin Stock held by Amerin as treasury stock or owned by
CMAC or any of its Subsidiaries immediately prior to the Effective Time shall be
canceled, and no payment shall be made with respect thereto.
 
     SECTION 1.03. CMAC Stock. At and after the Effective Time, each share of
CMAC Stock issued and outstanding immediately prior to the Effective Time shall
remain an issued and outstanding share of common stock of the Surviving
Corporation and shall not be affected by the Merger.
 
     SECTION 1.04. Surrender and Payment. (a) Prior to the Effective Time, CMAC
shall appoint an agent (the "EXCHANGE AGENT") for the purpose of exchanging
certificates representing Amerin Stock (the "CERTIFICATES") for the Merger
Consideration. As of the Effective Time, the Surviving Corporation will make
available to the Exchange Agent, as needed, the Merger Consideration to be paid
in respect of shares of Amerin Stock. Promptly after the Effective Time, CMAC
will send, or will cause the Exchange Agent to send, to each holder of shares of
Amerin Stock at the Effective Time a letter of transmittal for use in such
exchange (which shall specify that the delivery shall be effected, and risk of
loss and title shall pass, only upon proper delivery of the Certificates to the
Exchange Agent).
 
     (b) Each holder of shares of Amerin Stock that have been converted into the
right to receive the Merger Consideration will be entitled to receive, upon
surrender to the Exchange Agent of a Certificate, together with a properly
completed letter of transmittal, the Merger Consideration in respect of the
Amerin Stock represented by such Certificate. Until so surrendered, each such
Certificate shall, after the Effective Time, represent for all purposes only the
right to receive such Merger Consideration.
 
     (c) If any portion of the Merger Consideration is to be paid to a person
other than the person in whose name the Certificate is registered, it shall be a
condition to such payment that the Certificate so surrendered shall be properly
endorsed or otherwise be in proper form for transfer and that the person
requesting such payment shall pay to the Exchange Agent any transfer or other
taxes required as a result of such payment to a person other than the registered
holder of such Certificate or shall establish to the satisfaction of the
Exchange Agent that such tax has been paid or is not payable.
 
     (d) After the Effective Time, there shall be no further registration of
transfers of shares of Amerin Stock. If, after the Effective Time, Certificates
are presented to the Surviving Corporation, they shall be canceled and exchanged
for the consideration provided for, and in accordance with the procedures set
forth, in this Section.
 
                                       I-2
<PAGE>   96
 
     (e) Any portion of the Merger Consideration made available to the Exchange
Agent pursuant to Section 1.04(a) that remains unclaimed by the holders of
shares of Amerin Stock six months after the Effective Time shall be returned to
the Surviving Corporation, upon demand, and any such holder who has not
exchanged shares of Amerin Stock for the Merger Consideration prior to that time
shall thereafter look only to the Surviving Corporation for payment of the
Merger Consideration in respect of such shares of Amerin Stock. Notwithstanding
the foregoing, the Surviving Corporation shall not be liable to any holder of
shares of Amerin Stock for any amount paid to a public official pursuant to
applicable abandoned property laws. Any amounts remaining unclaimed by holders
of shares of Amerin Stock two years after the Effective Time (or such earlier
date immediately prior to such time as such amounts would otherwise escheat to
or become property of any Governmental Entity) shall, to the extent permitted by
applicable law, become the property of the Surviving Corporation free and clear
of any claims or interest of any person previously entitled thereto.
 
     (f) No dividends, interest or other distributions with respect to CMAC
Stock constituting part of the Merger Consideration shall be paid to the holder
of any unsurrendered Certificates until such Certificates are surrendered as
provided in this Section. Upon such surrender, there shall be paid, without
interest, to the person in whose name the CMAC Stock has been registered, all
dividends, interest and other distributions payable in respect of such
securities on a date subsequent to, and in respect of a record date after, the
Effective Time.
 
     SECTION 1.05. Stock Options and Restricted Stock. (a) At the Effective
Time, each option to purchase shares of Amerin Stock outstanding under any
employee or director stock option or compensation plan or arrangement of Amerin,
whether or not exercisable and whether or not vested, shall be assumed by CMAC
and shall constitute an option (a "SUBSTITUTE OPTION") to acquire, on the same
terms and conditions as were applicable under such assumed option (giving effect
to any acceleration of vesting arising in connection with the transactions
contemplated hereby), that number of shares of CMAC Stock equal to the product
of the Exchange Ratio times the number of shares of Amerin Stock subject to such
option, at a price per share (rounded to the nearest $0.001) equal to the
aggregate exercise price for the shares of Amerin Stock subject to such option
divided by the number of full shares of CMAC Stock deemed to be purchasable
pursuant to such option; provided, however, that (i) subject to the provisions
of clause (ii) below, the number of shares of CMAC Stock that may be purchased
upon exercise of such Substitute Option shall not include any fractional shares,
and, upon the last such exercise of such Substitute Option, CMAC shall pay to
the holder thereof an amount of cash equal to such fraction multiplied by the
closing price of CMAC Stock as reported on the NYSE on the date of such
exercise, and (ii) in the case of any Substitute Option to which Section 421 of
the Code applies by reason of its qualification under Section 422 of the Code,
the option price, the number of shares purchasable pursuant to such Substitute
Option and the terms and conditions of exercise of such Substitute Option shall
be determined in order to comply with Section 424 of the Code. The provisions of
this Section 1.05 shall in all events be interpreted and effected in a manner
that is consistent with the parties' obligations under Section 5.15.
 
     (b) If any shares of Amerin Stock outstanding at the Effective Time are
subject to any contractual restrictions (other than contractual restrictions
that lapse or cease as a result of consummation of the Merger) relating to the
continued performance of services to Amerin or any of its Subsidiaries by the
holder, such restrictions shall continue to apply to the CMAC Stock received by
such holder pursuant to this Article 1 in respect of such restricted shares of
Amerin Stock and shall thereafter relate to the continuing performance of
services by the holder to the Surviving Corporation.
 
     (c) Prior to the Effective Time, Amerin will obtain such consents, if any,
as may be necessary to give effect to the provisions of this Section. In
addition, prior to the Effective Time, CMAC and Amerin will make such
amendments, if any, to the terms of the stock option or compensation plans or
arrangements of CMAC and Amerin, as the case may be, and take such other actions
as are necessary to give effect to the provisions of this Section.
 
                                       I-3
<PAGE>   97
 
     (d) Promptly after the Effective Time, the Surviving Corporation shall send
to each holder of a Substitute Option a notice informing such holder of the
amendments to the terms of such holder's Amerin option effected pursuant to this
Section 1.05.
 
     SECTION 1.06. Adjustments. If at any time during the period between the
date of this Agreement and the Effective Time, any change in the outstanding
shares of capital stock of Amerin or CMAC shall occur, including by reason of
any reclassification, recapitalization, stock split or combination, exchange or
readjustment of shares, or any stock dividend thereon with a record date during
such period, the Merger Consideration shall be equitably adjusted to eliminate
the effects of such event.
 
     SECTION 1.07. Fractional Shares. No fractional shares of CMAC Stock shall
be issued in connection with the Merger. In lieu of the issuance of any such
fractional share, the Surviving Corporation shall pay to each former Amerin
stockholder who otherwise would be entitled to receive such fractional share as
a result of the Merger an amount in cash determined by multiplying the closing
sale price of CMAC Stock on the New York Stock Exchange (the "NYSE") on the
trading day immediately preceding the Effective Time by the fraction of a share
of CMAC Stock to which such holder otherwise would have been entitled.
 
     SECTION 1.08. Withholding Rights. The Surviving Corporation shall be
entitled to deduct and withhold from the consideration otherwise payable to any
person pursuant to this Article such amounts as it is required to deduct and
withhold with respect to the making of such payment under any provision of
federal, state, local or foreign tax law. To the extent that amounts are so
withheld by the Surviving Corporation, such withheld amounts shall be treated
for all purposes of this Agreement as having been paid to the holder of the
shares of Amerin Stock in respect of which such deduction and withholding was
made by the Surviving Corporation.
 
     SECTION 1.09. Lost Certificates. If any Certificate shall have been lost,
stolen or destroyed, upon the making of an affidavit of that fact by the person
claiming such Certificate to be lost, stolen or destroyed and, if required by
the Surviving Corporation, the posting by such person of a bond, in such
reasonable amount as the Surviving Corporation may determine is reasonably
necessary as indemnity against any claim that may be made against it with
respect to such Certificate, the Exchange Agent will issue in exchange for such
lost, stolen or destroyed Certificate the Merger Consideration deliverable in
respect thereof pursuant to this Agreement.
 
                                   ARTICLE 2
 
                           THE SURVIVING CORPORATION
 
     SECTION 2.01. Certificate of Incorporation. The certificate of
incorporation of the Surviving Corporation after the Effective Time shall be as
set forth in Exhibit A until thereafter changed or amended as provided therein
or by applicable law.
 
     SECTION 2.02. Bylaws. The bylaws of CMAC in effect immediately prior to the
Effective Time shall be the bylaws of the Surviving Corporation after the
Effective Time until thereafter changed or amended as provided therein or by
applicable law, except that (i) Section 4.02 thereof shall be amended to provide
that the size of the Surviving Corporation Board may be changed, until the
Surviving Corporation's annual stockholder meeting to be held in the year 2000
(the "2000 ANNUAL MEETING"), only with the approval of two-thirds of the entire
Surviving Corporation Board and, thereafter, only with the approval of a
majority of the directors present at a meeting at which a quorum is present,
(ii) Section 4.04(a) thereof shall be amended to provide that vacancies and
newly created directorships resulting from any increase in the authorized number
of directors of the Surviving Corporation Board may be filled, until the 2000
Annual Meeting, only with the approval of two-thirds of the remaining Board
members and, thereafter, only with the approval of a majority of the remaining
directors present at a meeting at which a quorum is present, (iii) Section
4.10(a) thereof shall be amended to provide that, until the 2000 Annual Meeting,
two-thirds of the entire Surviving Corporation Board shall constitute a quorum
for the transaction of business and, thereafter, a majority of the entire
Surviving Corporation Board shall constitute a quorum for the transaction of
business.
 
                                       I-4
<PAGE>   98
 
     SECTION 2.03. Board and Board Committees of the Surviving Corporation. CMAC
shall take all action necessary so that at the Effective Time (i) the Surviving
Corporation Board shall consist of the number of members mutually agreed upon by
CMAC and Amerin prior to the Effective Time; provided that such number shall not
be less than nine or more than fourteen, (ii) approximately 62% of the Surviving
Corporation Board shall consist of members designated by CMAC prior to the
Effective Time, all of whom are either members of the CMAC Board on the date of
this Agreement or are designees acceptable to Amerin (the "CMAC DIRECTOR
DESIGNEES"), (iii) approximately 38% of the Surviving Corporation Board shall
consist of members designated by Amerin prior to the Effective Time, all of whom
are either members of the Amerin Board on the date of this Agreement or are
designees acceptable to CMAC (the "AMERIN DIRECTOR DESIGNEES"), (iv) the CMAC
Director Designees and the Amerin Director Designees shall be divided as evenly
as possible among the classes of the Surviving Corporation Board, (v) each
committee of the Surviving Corporation Board that does not have more than four
members shall consist of at least one Amerin Director Designee, (vi) each
committee of the Surviving Corporation Board that does have more than four
members shall consist of that number of Amerin Director Designees that
corresponds to their proportionate representation on the Surviving Corporation
Board and (vii) Roy J. Kasmar shall be a member of the Executive Committee of
the Surviving Corporation Board.
 
     SECTION 2.04. Management. CMAC shall take all action necessary to appoint
(i) Frank P. Filipps as Chairman of the Board and Chief Executive Officer of the
Surviving Corporation at the Effective Time and (ii) Roy J. Kasmar as President
and Chief Operating Officer of the Surviving Corporation at the Effective Time.
Mr. Filipps and Mr. Kasmar shall consult with each other on the selection of the
other executive officers of the Surviving Corporation.
 
     SECTION 2.05. Headquarters. The Surviving Corporation shall cause its
headquarters to be located in Philadelphia, Pennsylvania.
 
                                   ARTICLE 3
 
                    REPRESENTATIONS AND WARRANTIES OF AMERIN
 
     Amerin represents and warrants to CMAC that, except as disclosed in the
Amerin Schedule of Exceptions (which will identify exceptions by specific
Section references) or as otherwise expressly contemplated by this Agreement:
 
     SECTION 3.01. Corporate Existence and Power. Amerin is a corporation duly
incorporated, validly existing and in good standing under the laws of the State
of Delaware and has all corporate powers and all governmental licenses,
authorizations, permits, consents and approvals required to carry on its
business as now conducted, except for those licenses, authorizations, permits,
consents and approvals the absence of which would not, individually or in the
aggregate, reasonably be expected to have a Material Adverse Effect on Amerin.
Amerin is duly qualified to do business as a foreign corporation and is in good
standing in each jurisdiction where such qualification is necessary, except for
those jurisdictions where failure to be so qualified would not, individually or
in the aggregate, reasonably be expected to have a Material Adverse Effect on
Amerin. Amerin has heretofore delivered to CMAC true and complete copies of the
certificate of incorporation and bylaws of Amerin as currently in effect.
 
     SECTION 3.02. Corporate Authorization. (a) The execution, delivery and
performance by Amerin of this Agreement and the consummation of the transactions
contemplated hereby are within the corporate powers of Amerin and, except for
the required approval of Amerin's stockholders in connection with the
consummation of the Merger, have been duly authorized by all necessary corporate
action. The affirmative vote of the holders of a majority of the outstanding
shares of Amerin Stock is the only vote of the Amerin stockholders necessary in
connection with the consummation of the Merger. No other vote of the Amerin
stockholders is necessary in connection with this Agreement or the consummation
of the transactions contemplated hereby. This Agreement constitutes a valid and
binding agreement of Amerin.
 
                                       I-5
<PAGE>   99
 
     (b) The Amerin Board, at a meeting duly called and held, has (i) determined
that this Agreement and the transactions contemplated hereby (including the
Merger) are fair to and in the best interests of Amerin's stockholders, (ii)
declared advisable and approved and adopted this Agreement and the transactions
contemplated hereby (including the Merger) and (iii) resolved to recommend
approval and adoption of this Agreement by its stockholders.
 
     SECTION 3.03. Governmental Authorization. The execution, delivery and
performance by Amerin of this Agreement and the consummation by Amerin of the
transactions contemplated hereby require no action by or in respect of, or
filing with, any domestic or foreign governmental body, agency, official or
authority ("GOVERNMENTAL ENTITY") other than (i) the filing of a certificate of
merger in accordance with Delaware Law, (ii compliance with any applicable
requirements of the Hart-Scott-Rodino Antitrust Improvements Act of 1976 ("HSR
ACT"), the Securities Act of 1933 ("SECURITIES ACT"), the Securities Exchange
Act of 1934 ("EXCHANGE ACT") or any other applicable securities laws, (iii
approvals and filings under the insurance laws of the jurisdictions set forth in
Section 3.03 of the Amerin Schedule of Exceptions and (iv) any other filings,
approvals or authorizations which, if not obtained or made, would not,
individually or in the aggregate, reasonably be expected to have a Material
Adverse Effect on Amerin.
 
     SECTION 3.04. Non-Contravention. The execution, delivery and performance by
Amerin of this Agreement and the consummation by Amerin of the transactions
contemplated hereby do not and will not (i) contravene or violate the
certificate of incorporation or bylaws of Amerin or the equivalent documents of
any of its Subsidiaries, (ii) assuming compliance with the matters referred to
in Section 3.03, contravene or violate any applicable law, rule, regulation,
judgment, injunction, order or decree binding upon or applicable to Amerin or
any of its Subsidiaries, (iii) require any consent or other action by any person
under, constitute a default under, or give rise to any right of termination,
cancellation or acceleration of any right or obligation of Amerin or any of its
Subsidiaries or to a loss of any benefit to which Amerin or any of its
Subsidiaries is entitled under any provision of any agreement or other
instrument binding upon Amerin or any of its Subsidiaries or any license,
franchise, permit, certificate, approval or other similar authorization
affecting, or relating in any way to, the assets or business of Amerin or any of
its Subsidiaries or (iv) result in the creation or imposition of any Lien on any
asset of Amerin or any of its Subsidiaries except, in the case of clauses (ii),
(iii) and (iv), for such matters as would not, individually or in the aggregate,
reasonably be expected to have a Material Adverse Effect on Amerin. For purposes
of this Agreement, "LIEN" means, with respect to any property or asset, any
mortgage, lien, pledge, charge, security interest, encumbrance or other adverse
claim of any kind in respect of such property or asset.
 
     SECTION 3.05. Capitalization. The authorized capital stock of Amerin
consists of (i) 100,000,000 shares of Amerin Stock, of which 50,000,000 shares
are voting common stock ("VOTING AMERIN STOCK") and 50,000,000 shares are
nonvoting common stock ("NONVOTING AMERIN STOCK"); (ii) 10,000,000 shares of
Preferred Stock, par value $.01 per share, of which 300,000 shares have been
designated Series A Participating Cumulative Preferred Stock (the "SERIES A
PREFERRED STOCK"); and (iii) 113,173 shares of 13.5% Convertible Preferred
Stock, par value $.01 per share. As of November 16, 1998, there were outstanding
26,507,948 shares of Amerin Stock, of which 24,851,039 shares are Voting Amerin
Stock and 1,656,909 shares are Nonvoting Amerin Stock, and no shares of
Preferred Stock (including Series A Preferred Stock) and 13.5% Convertible
Preferred Stock. As of November 16, 1998, there were outstanding options to
purchase an aggregate of 1,832,326 shares of Voting Amerin Stock at an average
exercise price of $17.75 per share (of which options to purchase an aggregate of
436,020 shares of Voting Amerin Stock were exercisable). All outstanding shares
of capital stock of Amerin have been duly authorized and validly issued and are
fully paid and non-assessable. Except for the Amerin Stockholder Rights, except
as set forth in this Section and except for changes since November 16, 1998
resulting from the exercise of employee stock options outstanding on such date,
there are no outstanding (i) shares of capital stock or voting securities of
Amerin, (ii) securities of Amerin or any of its Subsidiaries convertible into or
exchangeable for shares of capital stock or voting securities of Amerin or (iii)
options or other rights to acquire from Amerin or any of its Subsidiaries or
other obligations of Amerin to issue, any capital stock, voting securities or
securities convertible into or exchangeable for capital stock or voting
securities of
 
                                       I-6
<PAGE>   100
 
Amerin. There are no outstanding obligations of Amerin or any of its
Subsidiaries to repurchase, redeem or otherwise acquire any securities referred
to in clauses (i), (ii) or (iii) above.
 
     SECTION 3.06. Assets Necessary. Amerin and its Subsidiaries own, lease or
license all material property and assets (including without limitation
Intellectual Property and Software) necessary to carry on their businesses and
operations as presently conducted. All such material assets and properties
(other than as CMAC and Amerin may mutually agree) will be owned, leased or
licensed by Amerin and its Subsidiaries at the Effective Time and will as of the
Effective Time permit the Surviving Corporation and its Subsidiaries to conduct
such businesses and operations in substantially the same manner as such
businesses and operations have been conducted by Amerin prior to the Effective
Time.
 
     SECTION 3.07. Subsidiaries. (a) Each Subsidiary of Amerin is a corporation
duly incorporated, validly existing and in good standing under the laws of its
jurisdiction of incorporation, has all corporate powers and all governmental
licenses, authorizations, permits, consents and approvals required to carry on
its business as now conducted, except for those licenses, authorizations,
permits, consents and approvals the absence of which would not, individually or
in the aggregate, reasonably be expected to have a Material Adverse Effect on
Amerin. Each Subsidiary of Amerin is duly qualified, or otherwise authorized, to
transact business as a corporation and is in good standing in each jurisdiction
where such qualification is necessary, except for those jurisdictions where
failure to be so qualified would not, individually or in the aggregate,
reasonably be expected to have a Material Adverse Effect on Amerin. Section
3.07(a) of the Amerin Schedule of Exceptions sets forth a complete and correct
list of all Amerin's Subsidiaries. Neither Amerin nor any of its Subsidiaries
holds any interest in a partnership or joint venture of any kind.
 
     (b) All of the outstanding capital stock of, or other voting securities or
ownership interests in, each Subsidiary of Amerin is owned by Amerin, directly
or indirectly, free and clear of any Lien and free of any other limitation or
restriction (including any restriction on the right to vote, sell or otherwise
dispose of such capital stock or other voting securities or ownership
interests), other than any restrictions imposed under the Securities Act. Except
as set forth in this Section, there are no outstanding (i shares of capital
stock or other voting securities or ownership interests in any of Amerin's
Subsidiaries, (ii) securities of Amerin or any of its Subsidiaries convertible
into or exchangeable for shares of capital stock or other voting securities or
ownership interests in any of Amerin's Subsidiaries or (iii options or other
rights to acquire from Amerin or any of its Subsidiaries, or other obligations
of Amerin or any of its Subsidiaries to issue, any capital stock or other voting
securities or ownership interests in, or any securities convertible into or
exchangeable for any capital stock or other voting securities or ownership
interests in, any of Amerin's Subsidiaries. There are no outstanding obligations
of Amerin or any of its Subsidiaries to repurchase, redeem or otherwise acquire
any of the securities referred to in clauses (i), (ii) or (iii) above.
 
     SECTION 3.08. Licenses and Permits; Policies; Regulatory Matters. (a)
Amerin and its Subsidiaries hold all material consents, licenses, franchises,
permits, waivers, approvals or other similar authorizations (the "PERMITS")
necessary for the ownership and conduct of the respective businesses of Amerin
and its Subsidiaries, in the manner now conducted, in each of the jurisdictions
in which Amerin and its Subsidiaries conduct or operate their respective
businesses, and such Permits are in full force and effect in all material
respects. No material violations exist in respect of any Permit of Amerin and
its Subsidiaries, and no proceeding or investigation is pending, or to the
Knowledge of Amerin threatened, that would be reasonably likely to result in the
suspension, revocation, limitation or restriction of any Permit and, to the
Knowledge of Amerin, there is no reasonable basis for the assertion of any such
material violation or the institution of any such proceeding.
 
     (b) All insurance policies issued by any Subsidiary of Amerin as now in
force are, to the extent required under applicable law, in a form acceptable to
applicable regulatory authorities, or have been filed with and not objected to
by such authorities within the period provided for such objection.
 
     (c) Amerin and each Subsidiary of Amerin has filed all material reports,
statements, documents, registrations, filings or submissions required to be
filed by Amerin or any Subsidiary of Amerin, respectively, with any applicable
federal, state or local regulatory authorities, including but not limited to
state insurance regulatory authorities. All such material reports, statements,
documents, registrations, filings
 
                                       I-7
<PAGE>   101
 
and submissions complied in all material respects with applicable law in effect
when filed and no material deficiencies have been asserted by any such
regulatory authority with respect to such reports, statements, documents,
registrations, filings or submissions that have not been satisfied. All premium
rates, rating plans and policy forms established or used by Amerin or any
Subsidiary of Amerin that are required to be filed with or approved by insurance
regulatory authorities have been so filed or approved, the premiums charged
conform in all material respects to the premiums so filed or approved and comply
in all material respects with the insurance laws applicable thereto, except
where the failure to make such filing or obtain such approval would not,
individually or in the aggregate, reasonably be expected to have a Material
Adverse Effect on Amerin.
 
     (d) None of the information to be supplied by Amerin for inclusion in the
approvals and filings under the insurance laws of the jurisdictions set forth in
Section 3.03 of the Amerin Schedule of Exceptions will contain any untrue
statement of a material fact or omit to state any material fact required to be
stated therein or necessary in order to make the statements therein not
misleading.
 
     SECTION 3.09. SEC Filings. (a) Amerin has delivered to CMAC (i) its annual
report on Form 10-K for its fiscal year ended December 31, 1997 (the "AMERIN
10-K"), (ii) its quarterly reports on Form 10-Q for its fiscal quarters ended
after December 31, 1997, (iii) its proxy or information statements relating to
meetings of, or actions taken without a meeting by, the stockholders of Amerin
held since December 31, 1997 and (iv) all of its other reports, statements,
schedules, prospectuses and registration statements filed with the Securities
and Exchange Commission (the "SEC") since December 31, 1997 (the documents
referred to in this Section 3.09(a) being referred to collectively as the
"AMERIN SEC FILINGS"). Amerin's quarterly report on Form 10-Q for its fiscal
quarter ended September 30, 1998 is referred to herein as the "AMERIN 10-Q".
 
     (b) As of its filing date, each Amerin SEC Filing complied as to form in
all material respects with the applicable requirements of the Securities Act and
the Exchange Act.
 
     (c) As of its filing date, each Amerin SEC Filing filed pursuant to the
Exchange Act did not contain any untrue statement of a material fact or omit to
state any material fact necessary in order to make the statements made therein,
in the light of the circumstances under which they were made, not misleading.
 
     (d) Each such registration statement, if any, as amended or supplemented,
if applicable, filed pursuant to the Securities Act did not, as of the date such
statement or amendment became effective, contain any untrue statement of a
material fact or omit to state any material fact required to be stated therein
or necessary to make the statements therein not misleading.
 
     SECTION 3.10. Financial Statements. (a) The audited consolidated financial
statements and unaudited consolidated interim financial statements of Amerin
included in the Amerin SEC Filings fairly present, in conformity with GAAP
applied on a consistent basis (except as may be indicated in the notes thereto),
the consolidated financial position of Amerin and its Subsidiaries as of the
dates thereof and their consolidated results of operations and cash flows for
the periods then ended (subject to normal year-end adjustments in the case of
any unaudited consolidated interim financial statements). For purposes of this
Agreement, "AMERIN BALANCE SHEET" means the audited consolidated balance sheet
of Amerin as of December 31, 1997 set forth in the Amerin 10-K and "AMERIN
BALANCE SHEET DATE" means December 31, 1997. For purposes of this Agreement, the
"AMERIN UNAUDITED SEPTEMBER BALANCE SHEET" means the unaudited consolidated
balance sheet of Amerin and its Subsidiaries as of September 30, 1998.
 
     (b) The audited balance sheets of Amerin's Subsidiaries as of December 31,
1997, and the related statements of operations and statements of cash flows for
the year then ended, and their respective annual statements for the fiscal year
ended December 31, 1997 (the "AMERIN ANNUAL STATEMENTS") filed with the
insurance regulatory authorities in their respective jurisdictions of domicile
(collectively, the "REGULATORS"), copies of which have been delivered to CMAC,
fairly present in all material respects their respective statutory financial
conditions as of such date and the results of their respective operations and
cash flows for the year then ended in conformity with SAP. The other information
contained in the Amerin Annual Statements fairly presents in all material
respects the information required to be contained
 
                                       I-8
<PAGE>   102
 
therein in conformity with SAP. The balance sheets of Amerin and its
Subsidiaries in respect of any period ending after December 31, 1997, and the
related statements of operations and statements of cash flows, which have been
filed with Regulators, copies of which have been delivered to CMAC, fairly
present in all material respects their respective statutory financial conditions
as of such date and the results of their respective operations and cash flows
for the period then ended in conformity with SAP consistently applied.
 
     SECTION 3.11. Registration Statement; Joint Proxy Statement. None of the
information to be supplied by Amerin for inclusion or incorporation by reference
in the joint proxy statement relating to the meetings of Amerin's shareholders
and CMAC's shareholders to be held in connection with the Merger (together with
any amendments thereof or supplements thereto, the "JOINT PROXY STATEMENT") and
in the registration statement on Form S-4 to be filed by CMAC with the SEC with
respect to the CMAC Stock to be issued to Amerin's shareholders in connection
with the Merger (together with any amendments thereto, the "REGISTRATION
STATEMENT") in which the Joint Proxy Statement shall be included as a prospectus
will (i) in the case of the Joint Proxy Statement, at the time of the mailing
thereof, at the time of the Amerin Stockholder Meeting, and at the Effective
Time, contain any untrue statement of a material fact or omit to state any
material fact required to be stated therein or necessary in order to make the
statements therein, in light of the circumstances under which they are made, not
misleading or (ii) in the case of the Registration Statement, at the time it
becomes effective, contain any untrue statement of a material fact or omit to
state any material fact required to be stated therein or necessary in order to
make the statements therein not misleading. The Joint Proxy Statement and the
Registration Statement will comply (with respect to information relating to
Amerin) as to form in all material respects with the applicable provisions of
the Securities Act and the Exchange Act. Notwithstanding the foregoing, Amerin
makes no representation or warranty with respect to any information supplied by
CMAC which is contained in the Registration Statement or the Joint Proxy
Statement.
 
     SECTION 3.12. Absence of Certain Changes or Events. Since December 31,
1997, Amerin and its Subsidiaries have conducted their businesses only in the
ordinary course and in a manner consistent with past practice and, since such
date, there has not been (a) any event, occurrence, development or state of
circumstances or facts which would, individually or in the aggregate, reasonably
be expected to have a Material Adverse Effect on Amerin (other than an event,
occurrence, development or state of circumstances or facts related to (i) the
United States economy or securities markets in general, (ii) this Agreement or
the transactions contemplated hereby or the announcement thereof or (iii) the
mortgage insurance industry in general), (b) any event that could reasonably be
expected to prevent or materially delay the performance of this Agreement by
Amerin, or (c) any action taken by Amerin or any of its Subsidiaries that, if
taken during the period from the date of this Agreement through the Effective
Time, would constitute a breach of Section 5.01.
 
     SECTION 3.13. Material Liabilities; Investments. (a) There are no
liabilities of Amerin or any Subsidiary of Amerin of any kind whatsoever,
whether accrued, contingent, absolute, determined, determinable or otherwise,
and there is no existing condition, situation or set of circumstances which
could reasonably be expected to result in such a liability, other than:
 
          (i) liabilities provided for in the Amerin Balance Sheet;
 
          (ii) liabilities incurred since the Amerin Balance Sheet Date in the
     ordinary course of business, which would not, individually or in the
     aggregate, reasonably be expected to have a Material Adverse Effect on
     Amerin; and
 
          (iii) liabilities or obligations under this Agreement.
 
     (b) Section 3.13(b) of the Amerin Schedule of Exceptions describes in
reasonable detail all of Amerin's Investment Assets as of September 30, 1998.
 
     "INVESTMENT ASSETS" means, with respect to any person, any investment
assets (whether or not required by GAAP or SAP to be reflected on a balance
sheet) beneficially owned (within the meaning of Rule 13d-3 under the Exchange
Act) by such person or any Subsidiary of such person, including but not
 
                                       I-9
<PAGE>   103
 
limited to bonds, notes, debentures, mortgage loans, collateral loans and all
other instruments of indebtedness, stocks, partnership or joint venture
interests and all other equity interests, certificates issued by or interests in
trusts, derivatives and all other assets acquired for investment purposes.
 
     SECTION 3.14. Compliance with Laws and Court Orders. Amerin and each of its
Subsidiaries is and has been in compliance with, and to the Knowledge of Amerin,
is not under investigation with respect to and has not been threatened to be
charged with or given notice of any violation of, any applicable law, rule,
regulation, judgment, injunction, order or decree, except for such matters as
would not, individually or in the aggregate, reasonably be expected to have a
Material Adverse Effect on Amerin.
 
     SECTION 3.15. Material Contracts. (a) Neither Amerin nor any of its
Subsidiaries is a party to or bound by:
 
          (i) any agreement any of the benefits or costs of which will be
     increased, or the vesting of the benefits of which will be accelerated, by
     the occurrence of any of the transactions contemplated by this Agreement;
 
          (ii) any insurance related agreement with outside parties (other than
     any such agreement that is cancelable within 60 days without the payment of
     any penalty and other than insurance policies or other similar agreements
     issued by any Subsidiary of Amerin in the ordinary course of its business
     as to which Amerin has provided the principal forms to CMAC), including,
     but not limited to, those relating to borrower counseling and contract
     underwriting;
 
          (iii) any agreement which is a "material contract" (as such term is
     defined in Item 601(b)(10) of Regulation S-K under the Securities Act and
     the Exchange Act) that has not been filed or incorporated by reference in
     the Amerin SEC Filings;
 
          (iv) any agreement which would prohibit or materially delay the
     consummation of the Merger or any of the transactions contemplated by this
     Agreement;
 
          (v) any agreement relating to indebtedness for borrowed money or any
     guarantee or similar agreement relating thereto, other than any such
     agreement with, or relating to, an aggregate outstanding principal amount
     or guaranteed obligation not exceeding $1,000,000;
 
          (vi) any material license, franchise or similar agreement necessary
     for the operation of the business of Amerin and its Subsidiaries, taken as
     a whole;
 
          (vii) any material agency, dealer, sales representative, marketing or
     other similar agreement, other than any agency agreement on the relevant
     Subsidiaries' standard independent agency form;
 
          (viii) any agreement that restricts or prohibits Amerin or any
     Subsidiary or Affiliate of Amerin from competing with any person in any
     line of business or from competing in, engaging in or entering into any
     line of business in any area and which would so restrict or prohibit Amerin
     or any Subsidiary or Affiliate of Amerin after the Effective Time;
 
          (ix) any reinsurance agreement (in each case applicable to insurance
     in force);
 
          (x) any agreement containing "change in control" or similar provisions
     relating to a change in control of Amerin or any of its Subsidiaries;
 
          (xi) any "stop loss" agreement, other than those entered into in the
     ordinary course of business consistent with past practice;
 
          (xii) any agreement (other than insurance policies or other similar
     agreements issued by any Subsidiary of Amerin in the ordinary course of its
     business) pursuant to which Amerin or any Subsidiary of Amerin is obligated
     to indemnify any other person;
 
          (xiii) any agreement (other than any option agreement) with any
     Affiliate of Amerin or any director, officer or employee of Amerin or any
     of its Subsidiaries or Affiliates;
 
          (xiv) any other material agreement; or
 
                                      I-10
<PAGE>   104
 
          (xv) any guaranty of any of the foregoing.
 
     For the purposes of this Section 3.15(a), "agreement" means any agreement,
contract, arrangement, commitment or understanding (whether written or oral).
 
     (b) Amerin has heretofore furnished or made available to CMAC complete and
correct copies (or, if oral, accurate written summaries) of the items listed in
Section 3.15 of the Amerin Schedule of Exceptions, each as amended or modified
to the date hereof, including any waivers with respect thereto (the "AMERIN
SIGNIFICANT AGREEMENTS"). Except as specifically disclosed therein: (i) each of
the Amerin Significant Agreements is valid and binding on Amerin or of its
Subsidiaries as applicable, and in full force and effect; (ii) Amerin and each
of its Subsidiaries, as applicable, have in all material respects performed all
material obligations required to be performed by them to date under each Amerin
Significant Agreement; (iii) neither Amerin nor any of its Subsidiaries knows
of, or has received notice of, any violation or default (or any condition which
with the passage of time or the giving of notice would cause such a violation of
or a default) by any party under any Amerin Significant Agreement, except as, in
the case of clauses (ii) and (iii), such matters as would not, individually or
in the aggregate, reasonably be expected to have a Material Adverse Effect on
Amerin. Set forth on Section 3.15 of the Amerin Schedule of Exceptions is a
description of any material changes as of the date hereof to the amount and
terms of the indebtedness of Amerin and its Subsidiaries from that described in
the notes to the Amerin 10-K.
 
     SECTION 3.16. Non-Claims Litigation. Except for any action, suit,
investigation or proceeding that involves a claim under any insurance,
reinsurance or indemnity policy, fidelity bond, surety bond or similar contract
or undertaking issued or entered into by Amerin or any Subsidiary of Amerin,
there is no action, suit, investigation or proceeding pending against, or to the
Knowledge of Amerin threatened against or affecting, Amerin or any Subsidiary of
Amerin or any of their respective properties before any court, arbitrator, or
any Governmental Entity which is reasonably likely to result in actual damages
individually in excess of $500,000 or actual damages in the aggregate in excess
of $1,000,000. There is no action, suit, investigation or proceeding pending
against, or to the Knowledge of Amerin threatened against or affecting, Amerin
or any Subsidiary of Amerin or any of their respective properties before any
court, arbitrator, or any Governmental Entity which would reasonably be expected
to prevent, enjoin, alter or materially delay the transactions contemplated
hereby. Neither Amerin nor any Subsidiary of Amerin nor any of their respective
properties is subject to any material order or judgment which would prevent or
delay the consummation of the transactions contemplated hereby.
 
     SECTION 3.17. Reserves; Reinsurance. (a) Each reserve and other liability
amount in respect of the insurance business, including without limitation
reserve and other liability amounts in respect of insurance policies,
established or reflected in the Amerin Annual Statements was reviewed and
certified by an independent actuary in accordance with applicable state
insurance laws and regulations. Each reserve and other liability amount in
respect of the insurance business, including without limitation reserve and
other liability amounts in respect of insurance policies, established or
reflected in the Amerin Unaudited September Balance Sheet was reviewed by an
independent actuary to the extent required by applicable state insurance laws
and regulations. Each reserve and other liability amount established or
reflected in the Amerin Annual Statements or the Amerin Unaudited September
Balance Sheet was in conformity with SAP and in compliance with the requirements
of the insurance laws, rules and regulations of the respective jurisdictions of
domicile of each Subsidiary of Amerin as of the date thereof. Each Subsidiary of
Amerin owns assets that qualify as admitted assets under the insurance laws,
rules and regulations of the respective jurisdictions of domicile of such
Subsidiary in an amount equal to the sum of all such reserves and liability
amounts and its minimum statutory capital and surplus as required by the
insurance laws, rules and regulations of the respective jurisdictions of
domicile of such Subsidiary. The reserves set forth in the Amerin Annual
Statements for the years indicated for payment of all insurance policy benefits,
losses, claims and expenses were considered adequate as of the date of such
statements by management of Amerin to cover the total amount of all reasonably
anticipated liabilities of Amerin and its Subsidiaries.
 
                                      I-11
<PAGE>   105
 
     (b) Section 3.17(b) of the Amerin Schedule of Exceptions lists, to the
extent not otherwise set forth in Section 3.15 of the Amerin Schedule of
Exceptions, all ceded reinsurance agreements in force as of the date hereof to
which any Subsidiary of Amerin is a party and under which there is liability by
either party to the agreement (collectively, the "AMERIN EXISTING REINSURANCE
AGREEMENTS"). Section 3.17(b) of the Amerin Schedule of Exceptions also lists
any reinsurance agreement pursuant to which Amerin or any of its Subsidiaries
has assumed any insurance obligations. Neither Amerin nor any of its
Subsidiaries has any reason to believe that any amount recoverable by any of the
Subsidiaries of Amerin pursuant to any Amerin Existing Reinsurance Agreement is
not fully collectible in due course and, to the Knowledge of Amerin, there is no
reason to believe that the financial condition of any such other party is
impaired to the extent that a default thereunder may reasonably be anticipated.
Each of the Subsidiaries of Amerin is entitled to take full credit in its
statutory financial statements pursuant to applicable insurance laws for ceded
reinsurance under the Amerin Existing Reinsurance Agreements to which it is a
party, and there is no claim under any Amerin Existing Reinsurance Agreement
that is disputed by any other party to such agreement.
 
     SECTION 3.18. Loans and Advances. Other than in the ordinary course of its
portfolio investment activities or loss mitigation activities, neither Amerin
nor any of its Subsidiaries has any contractual commitment to make any loan,
advance or capital contribution to, or investment in, any other person in excess
of $500,000.
 
     SECTION 3.19. Finders' Fees. Except for Donaldson, Lufkin & Jenrette
Securities Corporation ("DLJ") and Morgan Stanley, there is no investment
banker, broker, finder or other intermediary which has been retained by or is
authorized to act on behalf of Amerin or any of its Subsidiaries who might be
entitled to any fee or commission in connection with the transactions
contemplated by this Agreement.
 
     SECTION 3.20. Opinion of Financial Advisor. The Amerin Board has received
the opinion of DLJ, financial advisor to Amerin, to the effect that, as of the
date of this Agreement, the Exchange Ratio is fair from a financial point of
view to Amerin's stockholders.
 
     SECTION 3.21. Taxes. Except as set forth in the Amerin Balance Sheet
(including the notes thereto) and except as would not, individually or in the
aggregate, reasonably be expected to have a Material Adverse Effect on Amerin,
(i all Tax returns, statements, reports, forms, and similar filings
(collectively, the "AMERIN RETURNS") required to be filed with any taxing
authority by, or with respect to, Amerin and its Subsidiaries with respect to
Taxes have been filed in accordance with all applicable laws, (ii) Amerin and
its Subsidiaries have timely paid all Taxes shown as due and payable on the
Amerin Returns that have been so filed, and, as of the time of filing, the
Amerin Returns correctly reflected the facts regarding the income, business,
assets, operations, activities and the status of Amerin and its Subsidiaries
(other than Taxes which are being contested in good faith and for which adequate
reserves are reflected on the Amerin Balance Sheet), (iii) Amerin and its
Subsidiaries have made provision for all Taxes payable by Amerin and its
Subsidiaries for which no Amerin Return has yet been filed, (iv) the charges,
accruals and reserves for Taxes with respect to Amerin and its Subsidiaries
reflected on each of the Amerin Balance Sheet and the Amerin Unaudited September
Balance Sheet are adequate under GAAP to cover the Tax liabilities accruing
through the date thereof, (v) there is no action, suit, proceeding, audit or
claim now proposed or pending against or with respect to Amerin or any of its
Subsidiaries in respect of any Tax, (vi) no Amerin Returns have been examined by
the Internal Revenue Service ("IRS"), and the IRS has not made assessments with
respect to such returns, and (vii) there is in effect no extension or waiver of
the applicable statute of limitations of any jurisdiction regarding the
assessment or collection of any Tax.
 
     For purposes of this Agreement, "TAXES" or "TAX" means any taxes, duties,
assessments, fees, levies, or similar governmental charges, together with any
interest, penalties, and additions to tax, imposed by any taxing authority,
wherever located (i.e., whether federal, state, local, municipal, or foreign),
including, without limitation, all net income, gross income, gross receipts, net
receipts, sales, use, transfer, franchise, privilege, profits, social security,
disability, withholding, payroll, unemployment, employment, excise, severance,
property, windfall profits, value added, ad valorem, occupation, or any other
similar governmental charge or imposition.
 
                                      I-12
<PAGE>   106
 
     SECTION 3.22. Employee Benefit Plans. (a) Section 3.22 of the Amerin
Schedule of Exceptions identifies each "employee benefit plan", as defined in
Section 3(3) of the Employee Retirement Income Security Act of 1974 ("ERISA"),
each employment, severance or similar contract, plan, arrangement or policy
applicable to any director or officer of Amerin and each plan, fund, program,
policy, contract, commitment or arrangement providing for compensation, bonuses,
profit-sharing, stock option or other stock related rights or other forms of
incentive or deferred compensation, vacation benefits, insurance coverage
(including any self-insured arrangements), health or medical benefits,
disability benefits, workers' compensation, supplemental unemployment benefits,
severance benefits and post-employment or retirement benefits (including
compensation, pension, health, medical or life insurance benefits), whether
formal or informal, written or oral, which (i) is sponsored, maintained,
administered or contributed to by Amerin or any of its ERISA Affiliates (as
defined below) or under which Amerin or any of its ERISA Affiliates has any
obligation to contribute to, or any liability and (ii) covers any employee or
former employee, director or former director, consultant or former consultant,
independent contractor or former independent contractor, or present or former
beneficiary, dependent or assignee of any such employee, former employee,
director, former director, independent contractor, former independent
contractor, consultant or former consultant of Amerin or any of its
Subsidiaries. Such plans are referred to collectively herein as the "AMERIN
EMPLOYEE PLANS." Amerin has delivered or made available to CMAC, with respect to
all Amerin Employee Plans, true, complete and correct copies of the following
(including all amendments thereto): all plan documents, handbooks, manuals,
material employee communications and similar documents governing employment
policies, practices and procedures; all of the most recent summary plan
descriptions and any subsequent summaries of material modifications; Forms
series 5500 as filed with the IRS (including all required reports and supporting
schedules) for the most recent plan year; all trust agreements with respect to
the Amerin Employee Plans; copies of any contracts with service providers and
insurers providing benefits for participants or liability insurance or bonding
for the sponsors, administrators or trustees of any Amerin Employee Plan; most
recent annual audit and accounting of plan assets for all funded plans; and, as
applicable, the most recent IRS determination letters and IRS opinion letters
for all plans qualified under Section 401(a) of the Code. An "ERISA AFFILIATE"
of an entity is any enterprise which, with such entity, forms or formed at any
time since September 2, 1994, a controlled group of corporations within the
meaning of Section 414(b) of the Code, a group of trades or businesses under
common control within the meaning of Section 414(c) of the Code, or any
affiliated service group within the meaning of Section 414(m) of the Code.
 
     (b) Each Amerin Employee Plan has been maintained in compliance with its
terms and with the requirements prescribed by any and all statutes, orders,
rules and regulations (including but not limited to ERISA and the Code) which
are applicable to such Plan, including without limitation requirements as to
contributions, insurance premiums, fiduciary administration, plan operations,
employee classification and plan design, except where failure(s) to so comply
would not, individually or in the aggregate, reasonably be expected to have a
Material Adverse Effect on Amerin.
 
     (c) No Amerin Employee Plan constitutes a "multiemployer plan", as defined
in Section 3(37) of ERISA (a "MULTIEMPLOYER PLAN"), and no Amerin Employee Plan
is maintained in connection with any trust described in Section 501(c)(9) of the
Code. No Amerin Employee Plans are subject to Title IV of ERISA, Section 302 of
ERISA or Section 412 of the Code. Neither Amerin nor any of its Subsidiaries has
ever sponsored, maintained or contributed to, or incurred any liability with
respect to, any employee benefit plan subject to Title IV of ERISA (including
any Multiemployer Plan). Neither CMAC nor any of its ERISA Affiliates has
incurred any material liability under Title IV of ERISA arising in connection
with the termination of, or complete or partial withdrawal from, any plan
covered or previously covered by Title IV of ERISA. Nothing done or omitted to
be done and no transaction or holding of any asset under or in connection with
any Amerin Employee Plan has or will make Amerin or any Subsidiary, any officer
or director of Amerin or any Subsidiary subject to any liability under Title I
of ERISA or liable for any tax or penalty pursuant to Section 4975 of the Code
or Part 4 of Subtitle I of ERISA that, individually or in the aggregate, would
reasonably be expected to have a Material Adverse Effect on Amerin.
 
                                      I-13
<PAGE>   107
 
     (d) Each Amerin Employee Plan which is intended to be qualified under
Section 401(a) of the Code has been determined by the IRS to be so qualified and
has been so qualified during the period from its adoption to date, and each
trust forming a part thereof has been determined by the IRS to be exempt from
tax pursuant to Section 501(a) of the Code and, to the Knowledge of Amerin,
nothing has occurred and no facts have arisen since such IRS determination that
would jeopardize the tax qualified status of any such Amerin Employee Plan or
the tax-exempt status of any related trust.
 
     (e) There has been no amendment to, written interpretation or announcement
(whether or not written) by Amerin or any of its ERISA Affiliates relating to,
or change in employee participation or coverage under, any Amerin Employee Plan
which would increase materially the expense of maintaining such Amerin Employee
Plan above the level of the expense incurred in respect thereof for the fiscal
year ended on the Amerin Balance Sheet Date.
 
     (f) Neither Amerin nor any Subsidiary is a party to or subject to any union
contract or any employment contract or arrangement providing for annual future
compensation of $500,000 or more with any officer, consultant, director or
employee.
 
     SECTION 3.23. Environmental Matters. (a) Except as would not, individually
or in the aggregate, reasonably be expected to have a Material Adverse Effect on
Amerin,
 
          (i) no notice, notification, demand, request for information,
     citation, summons or order has been received by, no complaint has been
     filed against, no penalty has been assessed against, and no investigation,
     action, claim, suit, proceeding or review is pending or, to the Knowledge
     of Amerin, is threatened by any Governmental Entity or other person
     against, Amerin or any of its Subsidiaries, in each case relating to or
     arising out of any Environmental Law;
 
          (ii) Amerin and each of its Subsidiaries are and have been in
     compliance with all Environmental Laws and all Environmental Permits; and
 
          (iii) there are no liabilities of or relating to Amerin or any of its
     Subsidiaries of any kind whatsoever, whether accrued, contingent, absolute,
     determined, determinable or otherwise, arising under or relating to any
     Environmental Law and there are no facts, conditions, situations or set of
     circumstances which could reasonably be expected to result in or be the
     basis for any such liability.
 
     (b) The following terms shall have the meaning set forth below:
 
     "ENVIRONMENTAL LAWS" means any federal, state, local or foreign law
(including, without limitation, common law), treaty, judicial decision,
regulation, rule, judgment, order, decree, injunction, permit or governmental
restriction or requirement or any agreement with any Governmental Entity,
relating to human health and safety, the environment or to pollutants,
contaminants, wastes or chemicals or any toxic, radioactive, ignitable,
corrosive, reactive or otherwise hazardous substances, wastes or materials.
 
     "ENVIRONMENTAL PERMITS" means, with respect to any person, all permits,
licenses, franchises, certificates, approvals and other similar authorizations
of Governmental Entities required by Environmental Laws and necessary to the
business of such person as currently conducted.
 
     "AMERIN" and "ITS SUBSIDIARIES" shall, for purposes of this Section,
include any entity which is, in whole or in part, a corporate predecessor of
Amerin or any of its Subsidiaries.
 
     SECTION 3.24. Intellectual Property; Software. (a) Amerin and its
Subsidiaries own or otherwise have rights to use and, as of and from the
Effective Time, will own or otherwise have rights to use (in each case, free and
clear of any material Liens or other material limitations or restrictions) all
Intellectual Property used in their respective businesses as currently conducted
and as contemplated to be conducted; the use of any Intellectual Property by
Amerin and its Subsidiaries does not infringe on or otherwise violate the rights
of any person; and, to the Knowledge of Amerin, no person is challenging,
infringing on or otherwise violating any right of Amerin or any Subsidiary of
Amerin with respect to any Intellectual Property owned by and/or licensed to
Amerin and its Subsidiaries.
 
                                      I-14
<PAGE>   108
 
     (b) Amerin and its Subsidiaries own or have valid and enforceable licenses
or other rights to use (in each case, free and clear of any material Liens or
other material limitations or restrictions) all Software used in the conduct of
their respective businesses and operations as currently conducted; the use of
the Software by Amerin and its Subsidiaries does not infringe on or otherwise
violate the rights of any person; and, to the Knowledge of Amerin, no person is
challenging, infringing on or otherwise violating any right of Amerin or any
Subsidiary of Amerin with respect to any Software used by Amerin and its
Subsidiaries. Except as set forth in Section 3.24(b) of the Amerin Schedule of
Exceptions, from and after the Effective Time, Amerin and its Subsidiaries will
own or have valid and enforceable licenses or other rights to use (in each case,
free and clear of any material Liens or other material limitations or
restrictions) all Software used in the conduct of their respective businesses
and operations as currently conducted in the same manner as such Software has
been used to conduct such businesses and operations prior to the date hereof.
 
     "INTELLECTUAL PROPERTY" shall mean: trademarks, service marks, brand names,
certification marks, trade dress, assumed names, trade names and other
indications of origin, the goodwill associated with the foregoing and
registrations in any jurisdiction of, and applications in any jurisdiction to
register, the foregoing, including any extension, modification or renewal of any
such registration or application; inventions, discoveries and ideas, whether
patentable or not in any jurisdiction; patents, applications for patents
(including but not limited to divisions, continuations, continuations in part
and renewal applications), and any renewals, extensions or reissues thereof, in
any jurisdiction; nonpublic information, trade secrets and confidential
information and rights in any jurisdiction to limit the use or disclosure
thereof by any person; writings and other works, whether copyrightable or not in
any jurisdiction; registrations or applications for registration of copyrights
in any jurisdiction, and any renewals or extensions thereof; and any similar
intellectual property or proprietary rights; provided that "Intellectual
Property" shall not include Software.
 
     "SOFTWARE" shall mean all computer and telecommunication software including
source and object code and documentation and any other media (including but not
limited to manuals, journals and reference books).
 
     SECTION 3.25. Properties. Amerin and its Subsidiaries have good title to,
or in the case of leased property have valid leasehold interests in, all of
their respective properties and assets (whether real or personal, tangible or
intangible) except for imperfections in title or invalidities in leasehold
interests that do not, individually or in the aggregate, materially detract from
the value reflected on the Amerin Balance Sheet. None of such properties or
assets is subject to any Liens, except:
 
          (i) Liens reflected on the Amerin Balance Sheet;
 
          (ii) Liens for Taxes not yet due or being contested in good faith (and
     for which adequate accruals or reserves have been established on the Amerin
     Balance Sheet); and
 
          (iii) Liens which do not, individually or in the aggregate, materially
     detract from the value reflected on the Amerin Balance Sheet or materially
     interfere with any present or intended use of any material properties or
     assets.
 
     SECTION 3.26. Pooling; Tax Treatment. (a) Amerin intends that the Merger be
accounted for under the "pooling of interests" method under the requirements of
Opinion No. 16 (Business Combinations) of the Accounting Principles Board of the
American Institute of Certified Public Accountants (APB No. 16), as amended by
Statements of the Financial Accounting Standards Board, and the related
interpretations of the American Institute of Certified Public Accountants, the
Financial Accounting Standards Board, and the rules and regulations of the SEC.
 
     (b) To the best of Amerin's Knowledge, neither Amerin nor any of its
Affiliates has taken or agreed to take any action that would prevent the Merger
from qualifying (i) for "pooling of interests" accounting treatment as described
in (a) above or (ii) as a reorganization within the meaning of Section 368(a) of
the Code.
 
                                      I-15
<PAGE>   109
 
     SECTION 3.27. Takeover Statutes. The Amerin Board has approved the Merger
and this Agreement, and such approval is sufficient to render inapplicable to
the Merger, this Agreement and the transactions contemplated by this Agreement
the restrictions on "business combinations" set forth in Section 203 of the
Delaware Law. To the best of Amerin's Knowledge, no other "fair price",
"moratorium", "control share acquisition" or other similar antitakeover statute
or regulation enacted under state or federal laws in the United States
applicable to Amerin or any of its Subsidiaries is applicable to the Merger or
the other transactions contemplated hereby.
 
     SECTION 3.28. Transactions with Affiliates. Since December 31, 1997, there
have been no transactions, agreements, arrangements or understandings between
Amerin or its Subsidiaries, on the one hand, and Amerin's Affiliates (other than
wholly-owned Subsidiaries of Amerin) or other persons, on the other hand, that
would be required to be disclosed under Item 404 of Regulation S-K under the
Securities Act and the Exchange Act.
 
     SECTION 3.29. Business Information. The information Amerin has heretofore
provided to CMAC regarding the composition and performance of Amerin's
portfolios of primary and pool insurance and reinsurance is accurate and
includes all material information concerning such portfolios. Amerin has
provided CMAC with complete copies of all contracts and other business
arrangements with respect to the provision of insurance and any related services
(including without limitation primary insurance plans, pool insurance
commitments, reinsurance agreements, and contract underwriting arrangements).
Prior to the date of this Agreement, Amerin has disclosed to CMAC the terms and
provisions of any insurance or ancillary product, plan or service that are not
fully set forth in formal business agreements.
 
     SECTION 3.30. Year 2000. Amerin has undertaken a concerted effort to ensure
that all of the Software, databases, computer firmware, computer hardware (where
general or special purpose), and other similar or related items of automated,
computerized, and/or software system(s) that are used or relied on by Amerin or
by any of its Subsidiaries in the conduct of their respective businesses will
not malfunction, will not cease to function, will not generate incorrect data,
and will not provide incorrect results when processing, providing and/or
receiving date-related data with respect to any dates after December 31, 1999.
Amerin reasonably believes that such effort will be successful.
 
     SECTION 3.31. Rights Agreement. Amerin has taken all necessary action with
respect to all of the outstanding Amerin Stockholder Rights so that, as of
immediately prior to the Effective Time, as a result of entering into this
Agreement or consummating the Merger and the other transactions contemplated by
this Agreement, (i) neither Amerin nor CMAC will have any obligations under the
Amerin Stockholder Rights or the Amerin Rights Agreement and (ii) the holders of
the Amerin Stockholder Rights will have no rights under the Amerin Stockholder
Rights or the Amerin Rights Agreement.
 
                                   ARTICLE 4
 
                     REPRESENTATIONS AND WARRANTIES OF CMAC
 
     CMAC represents and warrants to Amerin that, except as disclosed in the
CMAC Schedule of Exceptions (which will identify exceptions by specific Section
references) or as otherwise expressly contemplated by this Agreement:
 
     SECTION 4.01. Corporate Existence and Power. CMAC is a corporation duly
incorporated, validly existing and in good standing under the laws of the State
of Delaware and has all corporate powers and all governmental licenses,
authorizations, permits, consents and approvals required to carry on its
business as now conducted, except for those licenses, authorizations, permits,
consents and approvals the absence of which would not, individually or in the
aggregate, reasonably be expected to have a Material Adverse Effect on CMAC.
CMAC is duly qualified to do business as a foreign corporation and is in good
standing in each jurisdiction where such qualification is necessary, except for
those jurisdictions where failure to be so qualified would not, individually or
in the aggregate, reasonably be expected to have a Material Adverse Effect on
CMAC. CMAC has heretofore delivered to Amerin true and complete copies of the
certificate of incorporation and bylaws of CMAC as currently in effect.
 
                                      I-16
<PAGE>   110
 
     SECTION 4.02. Corporate Authorization. (a) The execution, delivery and
performance by CMAC of this Agreement and the consummation of the transactions
contemplated hereby are within the corporate powers of CMAC and, except for the
required approval of CMAC's stockholders in connection with the consummation of
the Merger, have been duly authorized by all necessary corporate action. The
affirmative vote of the holders of not less than a majority of the outstanding
shares of CMAC Stock is the only vote of the CMAC stockholders necessary in
connection with the consummation of the Merger. No other vote of the CMAC
stockholders is necessary in connection with this Agreement or the consummation
of the transactions contemplated hereby. This Agreement constitutes a valid and
binding agreement of CMAC.
 
     (b) The CMAC Board, at a meeting duly called and held, has (i) determined
that this Agreement and the transactions contemplated hereby (including the
Merger) are fair to and in the best interests of CMAC's stockholders, (ii)
declared advisable and approved and adopted this Agreement and the transactions
contemplated hereby (including the Merger and the issuance of CMAC Stock
pursuant to this Agreement), and (iii) resolved to recommend approval and
adoption of this Agreement by its stockholders.
 
     SECTION 4.03. Governmental Authorization. The execution, delivery and
performance by CMAC of this Agreement and the consummation by CMAC of the
transactions contemplated hereby require no action by or in respect of, or
filing with, any Governmental Entity other than (i) the filing of a certificate
of merger in accordance with Delaware Law, (ii) compliance with any applicable
requirements of the HSR Act, the Securities Act, the Exchange Act or any other
applicable securities laws, (iii) approvals and filings under the insurance laws
of the jurisdictions set forth in Section 4.03 of the CMAC Schedule of
Exceptions and (iv) any other filings, approvals or authorizations which, if not
obtained or made, would not, individually or in the aggregate, reasonably be
expected to have a Material Adverse Effect on CMAC.
 
     SECTION 4.04. Non-Contravention. The execution, delivery and performance by
CMAC of this Agreement and the consummation by CMAC of the transactions
contemplated hereby do not and will not (i) contravene or violate the
certificate of incorporation or bylaws of CMAC or the equivalent documents of
any of its Subsidiaries, (ii) assuming compliance with the matters referred to
in Section 4.03, contravene or violate any applicable law, rule, regulation,
judgment, injunction, order or decree binding upon or applicable to CMAC or any
of its Subsidiaries, (iii) require any consent or other action by any person
under, constitute a default under, or give rise to any right of termination,
cancellation or acceleration of any right or obligation of CMAC or any of its
Subsidiaries or to a loss of any benefit to which CMAC or any of its
Subsidiaries is entitled under any provision of any agreement or other
instrument binding upon CMAC or any of its Subsidiaries or any license,
franchise, permit, certificate, approval or other similar authorization
affecting, or relating in any way to, the assets or business of CMAC or any of
its Subsidiaries or (iv) result in the creation or imposition of any Lien on any
asset of CMAC or any of its Subsidiaries except, in the case of clauses (ii),
(iii) and (iv), for such matters as would not, individually or in the aggregate,
reasonably be expected to have a Material Adverse Effect on CMAC.
 
     SECTION 4.05. Capitalization. The authorized capital stock of CMAC consists
of 80,000,000 shares of CMAC Stock and 20,000,000 shares of Preferred Stock, par
value $.001 per share, of which 800,000 shares have been designated $4.125
Preferred Stock ( the "$4.125 PREFERRED STOCK"). As of November 16, 1998, there
were outstanding 22,703,958 shares of CMAC Stock, and 800,000 shares of
Preferred Stock, all of which are shares of $4.125 Preferred Stock. As of
November 16, 1998, there were outstanding options to purchase an aggregate of
1,461,152 shares of CMAC Stock at an average exercise price of $21.33 per share
(of which options to purchase an aggregate of 736,577 shares of CMAC Stock were
exercisable). All outstanding shares of capital stock of CMAC have been duly
authorized and validly issued and are fully paid and non-assessable. Except for
the CMAC Stockholder Rights, except as set forth in this Section, except for
changes since November 16, 1998 resulting from the exercise of employee stock
options outstanding on such date and except for the transactions contemplated
hereby, there are no outstanding (i) shares of capital stock or voting
securities of CMAC, (ii) securities of CMAC or any of its Subsidiaries
convertible into or exchangeable for shares of capital stock or voting
securities of CMAC or (iii) options or other rights to acquire from CMAC or any
of its Subsidiaries or other obligations of CMAC to issue, any capital stock,
voting securities or securities convertible into or exchangeable for
 
                                      I-17
<PAGE>   111
 
capital stock or voting securities of CMAC. There are no outstanding obligations
of CMAC or any of its Subsidiaries to repurchase, redeem or otherwise acquire
any securities referred to in clauses (i), (ii) or (iii) above.
 
     SECTION 4.06. Assets Necessary. CMAC and its Subsidiaries own, lease or
license all material property and assets (including without limitation
Intellectual Property and Software) necessary to carry on their businesses and
operations as presently conducted. All such material assets and properties
(other than as CMAC and Amerin may mutually agree) will be owned, leased or
licensed by CMAC and its Subsidiaries at the Effective Time and will as of the
Effective Time permit the Surviving Corporation and its Subsidiaries to conduct
such businesses and operations substantially in the same manner as such
businesses and operations have been conducted by CMAC prior to the Effective
Time.
 
     SECTION 4.07. Subsidiaries. (a) Each Subsidiary of CMAC is a corporation
duly incorporated, validly existing and in good standing under the laws of its
jurisdiction of incorporation, has all corporate powers and all governmental
licenses, authorizations, permits, consents and approvals required to carry on
its business as now conducted, except for those licenses, authorizations,
permits, consents and approvals the absence of which would not, individually or
in the aggregate, reasonably be expected to have a Material Adverse Effect on
CMAC. Each Subsidiary of CMAC is duly qualified, or otherwise authorized, to
transact business as a corporation and is in good standing in each jurisdiction
where such qualification is necessary, except for those jurisdictions where
failure to be so qualified would not, individually or in the aggregate,
reasonably be expected to have a Material Adverse Effect on CMAC. Section
4.07(a) of the CMAC Schedule of Exceptions sets forth a complete and correct
list of all CMAC's Subsidiaries. Neither CMAC nor any of its Subsidiaries holds
any interest in a partnership or joint venture of any kind.
 
     (b) All of the outstanding capital stock of, or other voting securities or
ownership interests in, each Subsidiary of CMAC is owned by CMAC, directly or
indirectly, free and clear of any Lien and free of any other limitation or
restriction (including any restriction on the right to vote, sell or otherwise
dispose of such capital stock or other voting securities or ownership
interests), other than any restrictions imposed under the Securities Act. Except
as set forth in this Section, there are no outstanding (i) shares of capital
stock or other voting securities or ownership interests in any of CMAC's
Subsidiaries, (ii) securities of CMAC or any of its Subsidiaries convertible
into or exchangeable for shares of capital stock or other voting securities or
ownership interests in any of CMAC's Subsidiaries or (iii) options or other
rights to acquire from CMAC or any of its Subsidiaries, or other obligations of
CMAC or any of its Subsidiaries to issue, any capital stock or other voting
securities or ownership interests in, or any securities convertible into or
exchangeable for any capital stock or other voting securities or ownership
interests in, any of CMAC's Subsidiaries. There are no outstanding obligations
of CMAC or any of its Subsidiaries to repurchase, redeem or otherwise acquire
any of the securities referred to in clauses (i), (ii) or (iii) above.
 
     SECTION 4.08. Licenses and Permits; Policies; Regulatory Matters. (a) CMAC
and its Subsidiaries hold all Permits necessary for the ownership and conduct,
in the manner now conducted, of the respective businesses of CMAC and its
Subsidiaries in each of the jurisdictions in which CMAC and its Subsidiaries
conduct or operate their respective businesses, and such Permits are in full
force and effect in all material respects. No material violations exist in
respect of any Permit of CMAC and its Subsidiaries, and no proceeding or
investigation is pending, or to the Knowledge of CMAC threatened, that would be
reasonably likely to result in the suspension, revocation, limitation or
restriction of any Permit and, to the Knowledge of CMAC, there is no reasonable
basis for the assertion of any such material violation or the institution of any
such proceeding.
 
     (b) All insurance policies issued by any Subsidiary of CMAC as now in force
are, to the extent required under applicable law, in a form acceptable to
applicable regulatory authorities, or have been filed with and not objected to
by such authorities within the period provided for such objection.
 
     (c) CMAC and each Subsidiary of CMAC has filed all material reports,
statements, documents, registrations, filings or submissions required to be
filed by CMAC or any Subsidiary of CMAC, respectively, with any applicable
federal, state or local regulatory authorities, including but not limited to
state insurance regulatory authorities. All such material reports, statements,
documents, registrations, filings
 
                                      I-18
<PAGE>   112
 
and submissions complied in all material respects with applicable law in effect
when filed and no material deficiencies have been asserted by any such
regulatory authority with respect to such reports, statements, documents,
registrations, filings or submissions that have not been satisfied. All premium
rates, rating plans and policy forms established or used by CMAC or any
Subsidiary of CMAC that are required to be filed with or approved by insurance
regulatory authorities have been so filed or approved, the premiums charged
conform in all material respects to the premiums so filed or approved and comply
in all material respects with the insurance laws applicable thereto, except
where the failure to make such filing or obtain such approval would not,
individually or in the aggregate, reasonably be expected to have a Material
Adverse Effect on CMAC. None of the information to be supplied by CMAC for
inclusion in the approvals and filings under the insurance laws of the
jurisdictions set forth in Section 4.03 of the CMAC Schedule of Exceptions will
contain any untrue statement of a material fact or omit to state any material
fact required to be stated therein or necessary in order to make the statements
therein not misleading.
 
     SECTION 4.09. SEC Filings. (a) CMAC has delivered to Amerin (i) its annual
report on Form 10-K for its fiscal year ended December 31, 1997 (the "CMAC
10-K"), (ii) its quarterly reports on Form 10-Q for its fiscal quarters ended
after December 31, 1997, (iii) its proxy or information statements relating to
meetings of, or actions taken without a meeting by, the stockholders of CMAC
held since December 31, 1997 and (iv) all of its other reports, statements,
prospectuses, schedules and registration statements filed with the SEC since
December 31, 1997 (the documents referred to in this Section 4.09(a) being
referred to collectively as the "CMAC SEC FILINGS"). CMAC's quarterly report on
Form 10-Q for its fiscal quarter ended September 30, 1998 is referred to herein
as the "CMAC 10-Q".
 
     (b) As of its filing date, each CMAC SEC Filing complied as to form in all
material respects with the applicable requirements of the Securities Act and the
Exchange Act.
 
     (c) As of its filing date, each CMAC SEC Filing filed pursuant to the
Exchange Act did not contain any untrue statement of a material fact or omit to
state any material fact necessary in order to make the statements made therein,
in the light of the circumstances under which they were made, not misleading.
 
     (d) Each such registration statement, if any, as amended or supplemented,
if applicable, filed pursuant to the Securities Act did not, as of the date such
statement or amendment became effective, contain any untrue statement of a
material fact or omit to state any material fact required to be stated therein
or necessary to make the statements therein not misleading.
 
     SECTION 4.10. Financial Statements. (a) The audited consolidated financial
statements and unaudited consolidated interim financial statements of CMAC
included in the CMAC SEC Filings fairly present, in conformity with GAAP applied
on a consistent basis (except as may be indicated in the notes thereto), the
consolidated financial position of CMAC and its Subsidiaries as of the dates
thereof and their consolidated results of operations and cash flows for the
periods then ended (subject to normal year-end adjustments in the case of any
unaudited consolidated interim financial statements). For purposes of this
Agreement, "CMAC BALANCE SHEET" means the audited consolidated balance sheet of
CMAC as of December 31, 1997 set forth in the CMAC 10-K and "CMAC BALANCE SHEET
DATE" means December 31, 1997. For the purposes of this Agreement, the "CMAC
UNAUDITED SEPTEMBER BALANCE SHEET" means the unaudited consolidated balance
sheet of CMAC and its Subsidiaries as of September 30, 1998.
 
     (b) The audited balance sheets of CMAC's Subsidiaries as of December 31,
1997, and the related statements of operations and statements of cash flows for
the year then ended, and their respective annual statements for the fiscal year
ended December 31, 1997 (the "CMAC ANNUAL STATEMENTS") filed with the
Regulators, copies of which have been delivered to Amerin, fairly present in all
material respects their respective statutory financial conditions as of such
date and the results of their respective operations and cash flows for the year
then ended in conformity with SAP. The other information contained in the CMAC
Annual Statements fairly presents in all material respects the information
required to be contained therein in conformity with SAP. The balance sheets of
CMAC and its Subsidiaries in respect of any period ending after December 31,
1997, and the related statements of operations and statements of cash flows,
which have been filed with Regulators, copies of which have been delivered to
Amerin, fairly present in all material respects their respective statutory
financial conditions as of such date and the results of their
 
                                      I-19
<PAGE>   113
 
respective operations and cash flows for the period then ended in conformity
with SAP consistently applied.
 
     SECTION 4.11. Registration Statement; Joint Proxy Statement. None of the
information to be supplied by CMAC for inclusion or incorporation by reference
in the Joint Proxy Statement and the Registration Statement and any amendments
thereto will (i) in the case of the Joint Proxy Statement, at the time of the
mailing thereof, at the time of the CMAC Stockholder Meeting, and at the
Effective Time, contain any untrue statement of a material fact or omit to state
any material fact required to be stated therein or necessary in order to make
the statements therein, in light of the circumstances under which they are made,
not misleading or (ii) in the case of the Registration Statement, at the time it
becomes effective, contain any untrue statement of a material fact or omit to
state any material fact required to be stated therein or necessary in order to
make the statements therein not misleading. The Joint Proxy Statement and the
Registration Statement will comply (with respect to information relating to
CMAC) as to form in all material respects with the applicable provisions of the
Securities Act and the Exchange Act. Notwithstanding the foregoing, CMAC makes
no representation or warranty with respect to any information supplied by Amerin
which is contained in the Registration Statement or the Joint Proxy Statement.
 
     SECTION 4.12. Absence of Certain Changes or Events. Since December 31,
1997, CMAC and its Subsidiaries have conducted their businesses only in the
ordinary course and in a manner consistent with past practice and, since such
date, there has not been (a) any event, occurrence, development or state of
circumstances or facts which would, individually or in the aggregate, reasonably
be expected to have a Material Adverse Effect on CMAC (other than an event,
occurrence, development or state of circumstances or facts related to (i) the
United States economy or securities markets in general, (ii) this Agreement or
the transactions contemplated hereby or the announcement thereof or (iii) the
mortgage insurance industry in general), (b) any event that could reasonably be
expected to prevent or materially delay the performance of this Agreement by
CMAC, or (c) any action taken by CMAC or any of its Subsidiaries that, if taken
during the period from the date of this Agreement through the Effective Time,
would constitute a breach of Section 5.02.
 
     SECTION 4.13. Material Liabilities; Investments. (a) There are no
liabilities of CMAC or any Subsidiary of CMAC of any kind whatsoever, whether
accrued, contingent, absolute, determined, determinable or otherwise, and there
is no existing condition, situation or set of circumstances which could
reasonably be expected to result in such a liability, other than:
 
          (i) liabilities provided for in the CMAC Balance Sheet;
 
          (ii) liabilities incurred since the CMAC Balance Sheet Date in the
     ordinary course of business, which would not, individually or in the
     aggregate, reasonably be expected to have a Material Adverse Effect on
     CMAC; and
 
          (iii) liabilities or obligations under this Agreement.
 
     (b) Section 4.13(b) of the CMAC Schedule of Exceptions describes in
reasonable detail all of CMAC's Investment Assets as of September 30, 1998.
 
     SECTION 4.14. Compliance with Laws and Court Orders. CMAC and each of its
Subsidiaries is and has been in compliance with, and to the Knowledge of CMAC,
is not under investigation with respect to and has not been threatened to be
charged with or given notice of any violation of, any applicable law, rule,
regulation, judgment, injunction, order or decree, except for such matters as
would not, individually or in the aggregate, reasonably be expected to have a
Material Adverse Effect on CMAC.
 
     SECTION 4.15. Material Contracts. (a) Neither CMAC nor any of its
Subsidiaries is a party to or bound by:
 
          (i) any agreement any of the benefits or costs of which will be
     increased, or the vesting of the benefits of which will be accelerated, by
     the occurrence of any of the transactions contemplated by this Agreement;
 
                                      I-20
<PAGE>   114
 
          (ii) any insurance related agreement with outside parties (other than
     any such agreement that is cancelable within 60 days without the payment of
     any penalty and other than insurance policies or other similar agreements
     issued by any Subsidiary of CMAC in the ordinary course of its business as
     to which CMAC has provided the principal forms to Amerin), including, but
     not limited to, those relating to borrower counseling and contract
     underwriting;
 
          (iii) any agreement which is a "material contract" (as such term is
     defined in Item 601(b)(10) of Regulation S-K under the Securities Act and
     the Exchange Act) that has not been filed or incorporated by reference in
     the CMAC SEC Filings;
 
          (iv) any agreement which would prohibit or materially delay the
     consummation of the Merger or any of the transactions contemplated by this
     Agreement;
 
          (v) any agreement relating to indebtedness for borrowed money or any
     guarantee or similar agreement relating thereto, other than any such
     agreement with, or relating to, an aggregate outstanding principal amount
     or guaranteed obligation not exceeding $1,000,000;
 
          (vi) any material license, franchise or similar agreement necessary
     for the operation of the business of CMAC and its Subsidiaries, taken as a
     whole;
 
          (vii) any material agency, dealer, sales representative, marketing or
     other similar agreement, other than any agency agreement on the relevant
     Subsidiaries' standard independent agency form;
 
          (viii) any agreement that restricts or prohibits CMAC or any
     Subsidiary or Affiliate of CMAC from competing with any person in any line
     of business or from competing in, engaging in or entering into any line of
     business in any area and which would so restrict or prohibit CMAC or any
     Subsidiary or Affiliate of CMAC after the Effective Time;
 
          (ix) any reinsurance agreement (in each case applicable to insurance
     in force);
 
          (x) any agreement containing "change in control" or similar provisions
     relating to a change in control of CMAC or any of its Subsidiaries;
 
          (xi) any "stop loss" agreement, other than those entered into in the
     ordinary course of business consistent with past practice;
 
          (xii) any agreement (other than insurance policies or other similar
     agreements issued by any Subsidiary of CMAC in the ordinary course of its
     business) pursuant to which CMAC or any Subsidiary of CMAC is obligated to
     indemnify any other person;
 
          (xiii) any agreement (other than any option agreement) with any
     Affiliate of CMAC or any director, officer or employee of CMAC or any of
     its Subsidiaries or Affiliates;
 
          (xiv) any other material agreement; or
 
          (xv) any guaranty of any of the foregoing.
 
     For the purposes of this Section 4.15(a), "agreement" means any agreement,
contract, arrangement, commitment or understanding (whether written or oral).
 
     (b) CMAC has heretofore furnished or made available to Amerin complete and
correct copies (or, if oral, accurate written summaries) of the items listed in
Section 4.15 of the CMAC Schedule of Exceptions, each as amended or modified to
the date hereof, including any waivers with respect thereto (the "CMAC
SIGNIFICANT AGREEMENTS"). Except as specifically disclosed therein: (i) each of
the CMAC Significant Agreements is valid and binding on CMAC or its Subsidiaries
as applicable and in full force and effect; (ii) CMAC and each of its
Subsidiaries, as applicable, have in all material respects performed all
material obligations required to be performed by them to date under each CMAC
Significant Agreement; (iii) neither CMAC nor any of its Subsidiaries knows of,
or has received notice of, any violation or default (or any condition which with
the passage of time or the giving of notice would cause such violation of or a
default) by any party under any CMAC Significant Agreement or any other loan or
 
                                      I-21
<PAGE>   115
 
credit agreement, note, bond, mortgage, indenture or loan, except as, in the
case of clauses (ii) and (iii), such matters would not, individually or in the
aggregate, reasonably be expected to have a Material Adverse Effect on CMAC. Set
forth on Section 4.15 of the CMAC Schedule of Exceptions is a description of any
material changes as of the date hereof to the amount and terms of the
indebtedness of CMAC and its Subsidiaries from that described in the notes to
the CMAC 10-K.
 
     SECTION 4.16. Non-Claims Litigation. Except for any action, suit,
investigation or proceeding that involves a claim under any insurance,
reinsurance or indemnity policy, fidelity bond, surety bond or similar contract
or undertaking issued or entered into by CMAC or any Subsidiary of CMAC, there
is no action, suit, investigation or proceeding pending against, or to the
Knowledge of CMAC threatened against or affecting, CMAC or any Subsidiary of
CMAC or any of their respective properties before any court, arbitrator, or any
Governmental Entity which is reasonably likely to result in actual damages
individually in excess of $500,000 or actual damages in the aggregate in excess
of $1,000,000. There is no action, suit, investigation or proceeding pending
against, or to the Knowledge of CMAC threatened against or affecting, CMAC or
any Subsidiary of CMAC or any of their respective properties before any court,
arbitrator, or any Governmental Entity which would reasonably be expected to
prevent, enjoin, alter or materially delay the transactions contemplated hereby.
Neither CMAC nor any Subsidiary of CMAC nor any of their respective properties
is subject to any material order or judgment which would prevent or delay the
consummation of the transactions contemplated hereby.
 
     SECTION 4.17. Reserves; Reinsurance. (a) Each reserve and other liability
amount in respect of the insurance business, including without limitation
reserve and other liability amounts in respect of insurance policies,
established or reflected in the CMAC Annual Statements was reviewed and
certified by an independent actuary in accordance with applicable state
insurance laws and regulations. Each reserve and other liability amount in
respect of the insurance business, including without limitation reserve and
other liability amounts in respect of insurance policies, established or
reflected in the CMAC Unaudited September Balance Sheet was reviewed by an
independent actuary to the extent required by applicable state insurance laws
and regulations. Each reserve and other liability amount established or
reflected in the CMAC Annual Statements or the CMAC Unaudited September Balance
Sheet was in conformity with SAP and in compliance with the requirements of the
insurance laws, rules and regulations of the respective jurisdictions of
domicile of each Subsidiary of CMAC as of the date thereof. Each Subsidiary of
CMAC owns assets that qualify as admitted assets under the insurance laws, rules
and regulations of the respective jurisdictions of domicile of such Subsidiary
in an amount equal to the sum of all such reserves and liability amounts and its
minimum statutory capital and surplus as required by the insurance laws, rules
and regulations of the respective jurisdictions of domicile of such Subsidiary.
The reserves set forth in the CMAC Annual Statements for the years indicated for
payment of all insurance policy benefits, losses, claims and expenses were
considered adequate as of the date of such statements by management of CMAC to
cover the total amount of all reasonably anticipated liabilities of CMAC and its
Subsidiaries.
 
     (b) Section 4.17(b) of CMAC Schedule of Exceptions lists, to the extent not
otherwise listed on Schedule 4.15 of the CMAC Schedule of Exceptions, all ceded
reinsurance agreements in force as of the date hereof to which any Subsidiary of
CMAC is a party and under which there is liability by either party to the
agreement (collectively, the "CMAC EXISTING REINSURANCE AGREEMENTS"). Section
4.17(b) of the CMAC Schedule of Exceptions also lists any reinsurance agreement
pursuant to which CMAC or any of its Subsidiaries has assumed any insurance
obligations. Neither CMAC nor any of its Subsidiaries has any reason to believe
that any amount recoverable by any of the Subsidiaries of CMAC pursuant to any
CMAC Existing Reinsurance Agreement is not fully collectible in due course and,
to the Knowledge of CMAC, there is no reason to believe that the financial
condition of any such other party is impaired to the extent that a default
thereunder may reasonably be anticipated. Each of the Subsidiaries of CMAC is
entitled to take full credit in its statutory financial statements pursuant to
applicable insurance laws for ceded reinsurance under the CMAC Existing
Reinsurance Agreements to which it is a party, and there is no claim under any
CMAC Existing Reinsurance Agreement that is disputed by any other party to such
agreement.
 
                                      I-22
<PAGE>   116
 
     SECTION 4.18. Loans and Advances. Other than in the ordinary course of its
portfolio investment activities or loss mitigation activities, neither CMAC nor
any of its Subsidiaries has any contractual commitment to make any loan, advance
or capital contribution to, or investment in, any other person in excess of
$500,000.
 
     SECTION 4.19. Finders' Fees. Except for Schroder & Co. Inc., there is no
investment banker, broker, finder or other intermediary which has been retained
by or is authorized to act on behalf of CMAC or any of its Subsidiaries who
might be entitled to any fee or commission in connection with the transactions
contemplated by this Agreement.
 
     SECTION 4.20. Opinion of Financial Advisor. The CMAC Board has received the
opinion of Schroder & Co. Inc., financial advisor to CMAC, to the effect that,
as of the date of this Agreement, the Exchange Ratio is fair from a financial
point of view to CMAC.
 
     SECTION 4.21. Taxes. Except as set forth in the CMAC Balance Sheet
(including the notes thereto) and except as would not, individually or in the
aggregate, reasonably be expected to have a Material Adverse Effect on CMAC, (i)
all Tax returns, statements, reports, forms, and similar filings (collectively,
the "CMAC RETURNS") required to be filed with any taxing authority by, or with
respect to, CMAC and its Subsidiaries with respect to Taxes have been filed in
accordance with all applicable laws, (ii) CMAC and its Subsidiaries have timely
paid all Taxes shown as due and payable on the CMAC Returns that have been so
filed, and, as of the time of filing, the CMAC Returns correctly reflected the
facts regarding the income, business, assets, operations, activities and the
status of CMAC and its Subsidiaries (other than Taxes which are being contested
in good faith and for which adequate reserves are reflected on the CMAC Balance
Sheet), (iii) CMAC and its Subsidiaries have made provision for all Taxes
payable by CMAC and its Subsidiaries for which no CMAC Return has yet been
filed, (iv) the charges, accruals and reserves for Taxes with respect to CMAC
and its Subsidiaries reflected on each of the CMAC Balance Sheet and the CMAC
Unaudited September Balance Sheet are adequate under GAAP to cover the Tax
liabilities accruing through the date thereof, (v) there is no action, suit,
proceeding, audit or claim now proposed or pending against or with respect to
CMAC or any of its Subsidiaries in respect of any Tax, (vi) all CMAC Returns for
fiscal years ending on or before December 31, 1985 have been examined by the
Internal Revenue Service, and any assessments with respect to such returns have
been paid in full, and (vii) there is in effect no extension or waiver of the
applicable statute of limitations of any jurisdiction regarding the assessment
or collection of any Tax.
 
     SECTION 4.22. Employee Benefit Plans. (a) Section 4.22 of the CMAC Schedule
of Exceptions identifies each "employee benefit plan", as defined in Section
3(3) of ERISA, each employment, severance or similar contract, plan, arrangement
or policy applicable to any director or officer of CMAC and each plan, fund,
program, policy, contract, commitment or arrangement, providing for
compensation, bonuses, profit-sharing, stock option or other stock related
rights or other forms of incentive or deferred compensation, vacation benefits,
insurance coverage (including any self-insured arrangements), health or medical
benefits, disability benefits, workers' compensation, supplemental unemployment
benefits, severance benefits and post-employment or retirement benefits
(including compensation, pension, health, medical or life insurance benefits),
whether formal or informal, written or oral, which (i) is sponsored, maintained,
administered or contributed to by CMAC or any of its ERISA Affiliates or under
which CMAC or any of its ERISA Affiliates has any liability and (ii) covers any
employee or former employee of CMAC or any of its Subsidiaries. Copies of such
plans and arrangements (and, if applicable, related trust agreements) and all
amendments thereto and written interpretations thereof have been furnished or
made available to Amerin together with the most recent annual report (Form 5500
including, if applicable, Schedule B thereto) prepared in connection with any
such plan. Such plans are referred to collectively herein as the "CMAC EMPLOYEE
PLANS".
 
     (b) Each CMAC Employee Plan has been maintained in compliance with its
terms and with the requirements prescribed by any and all statutes, orders,
rules and regulations (including but not limited to ERISA and the Code) which
are applicable to such plan, including without limitation requirements as to
contributions, insurance premiums, fiduciary administration, plan operations,
employee classification and
 
                                      I-23
<PAGE>   117
 
plan design, except where failure(s) to so comply would not, individually or in
the aggregate, reasonably be expected to have a Material Adverse Effect on CMAC.
 
     (c) No CMAC Employee Plan constitutes a Multiemployer Plan, and neither
CMAC nor any ERISA Affiliate contributes to, and has ever contributed to or had
any other liability with respect to a Multiemployer Plan. No CMAC Employee Plan
is maintained in connection with any trust described in Section 501(c)(9) of the
Code. The only CMAC Employee Plans that are subject to Title IV of ERISA,
Section 302 of ERISA or Section 412 of the Code (the "CMAC RETIREMENT PLANS")
are identified in Section 4.22 of the CMAC Schedule of Exceptions. As of the
CMAC Balance Sheet Date, the fair market value of the assets of each CMAC
Retirement Plan (excluding for these purposes any accrued but unpaid
contributions) exceeded the present value of all benefits accrued under such
CMAC Retirement Plans determined by using the interest rate and actuarial
assumptions used for funding purposes in the January 1, 1998 actuarial report.
No "accumulated funding deficiency", as defined in Section 412 of the Code, has
been incurred with respect to any CMAC Retirement Plan, whether or not waived.
CMAC knows of no "reportable event", within the meaning of Section 4043 of
ERISA, and no event described in Section 4041, 4042, 4062 or 4063 of ERISA has
occurred in connection with any CMAC Employee Plan, other than a "reportable
event" that would not, individually or in the aggregate, reasonably be expected
to have a Material Adverse Effect on CMAC. No condition exists and no event has
occurred that could constitute grounds for termination of any CMAC Retirement
Plan and neither CMAC nor any of its ERISA Affiliates has incurred any material
liability under Title IV of ERISA arising in connection with the termination of,
or complete or partial withdrawal from, any plan covered or previously covered
by Title IV of ERISA. Nothing done or omitted to be done and no transaction or
holding of any asset under or in connection with any CMAC Employee Plan has or
will make CMAC or any Subsidiary, any officer or director of CMAC or any
Subsidiary subject to any liability under Title I of ERISA or liable for any tax
or penalty pursuant to Section 4975 of the Code or Part 4 of Subtitle I of ERISA
that, individually or in the aggregate, would reasonably be expected to have a
Material Adverse Effect on CMAC.
 
     (d) Each CMAC Employee Plan which is intended to be qualified under Section
401(a) of the Code has been determined by the IRS to be so qualified and has
been so qualified during the period from its adoption to date, and each trust
forming a part thereof has been determined by the IRS to be exempt from tax
pursuant to Section 501(a) of the Code and to the Knowledge of CMAC, nothing has
occurred and no facts have arisen since such IRS determination that would
jeopardize the tax-qualified status of any such CMAC Employee Plan or the
tax-exempt status of any related trust.
 
     (e) There has been no amendment to, written interpretation or announcement
(whether or not written) by CMAC or any of its ERISA Affiliates relating to, or
change in employee participation or coverage under, any CMAC Employee Plan which
would increase materially the expense of maintaining such CMAC Employee Plan
above the level of the expense incurred in respect thereof for the fiscal year
ended on the CMAC Balance Sheet Date.
 
     (f) Neither CMAC nor any Subsidiary is a party to or subject to any union
contract or any employment contract or arrangement providing for annual future
compensation of $500,000 or more with any officer, consultant, director or
employee.
 
     SECTION 4.23. Environmental Matters. (a) Except as would not, individually
or in the aggregate, reasonably be expected to have a Material Adverse Effect on
CMAC,
 
          (i) no notice, notification, demand, request for information,
     citation, summons or order has been received by, no complaint has been
     filed against, no penalty has been assessed against, and no investigation,
     action, claim, suit, proceeding or review is pending or, to the Knowledge
     of CMAC, is threatened by any Governmental Entity or other person against,
     CMAC or any of its Subsidiaries, in each case relating to or arising out of
     any Environmental Law;
 
          (ii) CMAC and each of its Subsidiaries are and have been in compliance
     with all Environmental Laws and all Environmental Permits; and
 
                                      I-24
<PAGE>   118
 
          (iii) there are no liabilities of or relating to CMAC or any of its
     Subsidiaries of any kind whatsoever, whether accrued, contingent, absolute,
     determined, determinable or otherwise, arising under or relating to any
     Environmental Law and there are no facts, conditions, situations or set of
     circumstances which could reasonably be expected to result in or be the
     basis for any such liability.
 
     (b) The following terms shall have the meaning set forth below:
 
     "CMAC" and "ITS SUBSIDIARIES" shall, for purposes of this Section, include
any entity which is, in whole or in part, a corporate predecessor of CMAC or any
of its Subsidiaries.
 
     SECTION 4.24. Intellectual Property; Software. (a) CMAC and its
Subsidiaries own or otherwise have rights to use and, as of and from the
Effective Time, will own or otherwise have rights to use (in each case, free and
clear of any material Liens or other material limitations or restrictions) all
Intellectual Property used in their respective businesses as currently conducted
and as contemplated to be conducted; the use of any Intellectual Property by
CMAC and its Subsidiaries does not infringe on or otherwise violate the rights
of any person; and, to the Knowledge of CMAC, no person is challenging,
infringing on or otherwise violating any right of CMAC or any Subsidiary of CMAC
with respect to any Intellectual Property owned by and/or licensed to CMAC and
its Subsidiaries.
 
     (b) CMAC and its Subsidiaries own or have valid and enforceable licenses or
other rights to use (in each case, free and clear of any material Liens or other
material limitations or restrictions) all Software used in the conduct of their
respective businesses and operations as currently conducted; the use of the
Software by CMAC and its Subsidiaries does not infringe on or otherwise violate
the rights of any person; and, to the Knowledge of CMAC, no person is
challenging, infringing on or otherwise violating any right of CMAC or any
Subsidiary of CMAC with respect to any Software used by CMAC and its
Subsidiaries. Except as set forth in Section 4.24(b) of the CMAC Schedule of
Exceptions, from and after the Effective Time, CMAC and its Subsidiaries will
own or have valid and enforceable licenses or other rights to use (in each case,
free and clear of any material Liens or other material limitations or
restrictions) all Software used in the conduct of their respective businesses
and operations as currently conducted in the same manner as such Software has
been used to conduct such businesses and operations prior to the date hereof.
 
     SECTION 4.25. Properties. CMAC and its Subsidiaries have good title to, or
in the case of leased property have valid leasehold interests in, all of their
respective properties and assets (whether real or personal, tangible or
intangible) except for imperfections in title or invalidities in leasehold
interests that do not, individually or in the aggregate, materially detract from
the value reflected on the CMAC Balance Sheet. None of such properties or assets
is subject to any Liens, except:
 
          (i) Liens reflected on the CMAC Balance Sheet;
 
          (ii) Liens for Taxes not yet due or being contested in good faith (and
     for which adequate accruals or reserves have been established on the CMAC
     Balance Sheet); and
 
          (iii) Liens which do not, individually or in the aggregate, materially
     detract from the value reflected on the CMAC Balance Sheet or materially
     interfere with any present or intended use of any material properties or
     assets.
 
     SECTION 4.26. Pooling; Tax Treatment. (a) CMAC intends that the Merger be
accounted for under the "pooling of interests" method under the requirements of
Opinion No. 16 (Business Combinations) of the Accounting Principles Board of the
American Institute of Certified Public Accountants (APB No. 16), as amended by
Statements of the Financial Accounting Standards Board, and the related
interpretations of the American Institute of Certified Public Accountants, the
Financial Accounting Standards Board, and the rules and regulations of the SEC.
 
     (b) To the best of CMAC's Knowledge, neither CMAC nor any of its Affiliates
has taken or agreed to take any action that would prevent the Merger from
qualifying (i) for "pooling of interests" accounting treatment as described in
(a) above or (ii) as a reorganization within the meaning of Section 368(a) of
the Code.
 
                                      I-25
<PAGE>   119
 
     SECTION 4.27. Takeover Statutes. The CMAC Board has approved the Merger and
this Agreement, and such approval is sufficient to render inapplicable to the
Merger, this Agreement and the transactions contemplated by this Agreement the
restrictions on "business combinations" set forth in Section 203 of the Delaware
Law. To the best of CMAC's Knowledge, no other "fair price", "moratorium",
"control share acquisition" or other similar antitakeover statute or regulation
enacted under state or federal laws in the United States applicable to CMAC or
any of its Subsidiaries is applicable to the Merger or the other transactions
contemplated hereby.
 
     SECTION 4.28. Transactions with Affiliates. Since December 31, 1997, there
have been no transactions, agreements, arrangements or understandings between
CMAC or its Subsidiaries, on the one hand, and CMAC's Affiliates (other than
wholly-owned Subsidiaries of CMAC) or other persons, on the other hand, that
would be required to be disclosed under Item 404 of Regulation S-K under the
Securities Act and the Exchange Act.
 
     SECTION 4.29. Business Information. The information CMAC has heretofore
provided to Amerin regarding the composition and performance of CMAC's
portfolios of primary and pool insurance and reinsurance is accurate and
includes all material information concerning such portfolios. CMAC has provided
Amerin with complete copies of all contracts and other business arrangements
with respect to the provision of insurance and any related services (including
without limitation primary insurance plans, pool insurance commitments,
reinsurance agreements, and contract underwriting arrangements). Prior to the
date of this Agreement, CMAC has disclosed to Amerin the terms and provisions of
any insurance or ancillary product, plan or service that are not fully set forth
in formal business agreements.
 
     SECTION 4.30. Year 2000. CMAC has undertaken a concerted effort to ensure
that all of the Software, databases, computer firmware, computer hardware
(whether general or special purpose), and other similar or related items of
automated, computerized, and/or software system(s) that are used or relied on by
CMAC or by any of its Subsidiaries in the conduct of their respective businesses
will not malfunction, will cease to function, will not generate incorrect data,
and will not provide incorrect results when processing, providing and/or
receiving date-related data with respect to any dates after December 31, 1999.
CMAC reasonably believes that such effort will be successful.
 
     SECTION 4.31. Rights Agreement. CMAC has taken all necessary action with
respect to all of the outstanding CMAC Stockholder Rights so that, as of
immediately prior to the Effective Time, as a result of entering into this
Agreement or consummating the Merger and the other transactions contemplated by
this Agreement, (i) neither Amerin nor CMAC will have any obligations under the
CMAC Stockholder Rights or the CMAC Rights Agreement and (ii) the holders of the
CMAC Stockholder Rights will have no rights under the CMAC Stockholder Rights or
the CMAC Rights Agreement.
 
                                   ARTICLE 5
 
                                   COVENANTS
 
     SECTION 5.01. Conduct of Amerin. Amerin agrees that from the date hereof
until the Effective Time, except as set forth in Section 5.01 of the Amerin
Schedule of Exceptions or as otherwise contemplated by this Agreement or with
the prior written consent of CMAC, Amerin and its Subsidiaries shall conduct
their business in the ordinary course consistent with past practice and shall
use their reasonable best efforts to preserve intact their business
organizations and relationships with third parties and to keep available the
services of their present officers and employees. Without limiting the
generality of the foregoing, from the date hereof until the Effective Time,
except as set forth in Section 5.01 of the Amerin Schedule of
 
                                      I-26
<PAGE>   120
 
Exceptions or as otherwise contemplated by this Agreement or with the prior
written consent of CMAC, Amerin will not, and will not permit any of its
Subsidiaries to:
 
     (a) adopt or propose any change in its certificate of incorporation or
bylaws or equivalent documents;
 
     (b) amend any material term of any outstanding security of Amerin or any of
its Subsidiaries, or reclassify, combine, split, subdivide or redeem, purchase
or otherwise acquire, directly or indirectly, any of its capital stock;
 
     (c) merge or consolidate with any other person;
 
     (d) issue, sell, pledge, dispose of, grant, transfer, lease, license,
guarantee, encumber, or authorize the issuance, sale, pledge, disposition,
grant, transfer, lease, license, guarantee or encumbrance of (i) any shares of
capital stock of Amerin or any of its Subsidiaries of any class, or securities
convertible or exchangeable or exercisable for any shares of such capital stock,
or any options, warrants or other rights of any kind to acquire any shares of
such capital stock or such convertible or exchangeable securities, or any other
ownership interest of Amerin or any of its Subsidiaries or (ii) except in the
ordinary course of business and in a manner consistent with past practice, any
property or assets of Amerin or any of its Subsidiaries, except (A) the issuance
of Amerin Stock upon the exercise of Amerin options, (B) pursuant to contracts
or agreements in force at the date of this Agreement and set forth in the Amerin
Schedule of Exceptions or (C) sales, transfers or dispositions of receivables in
connection with the securitization of such receivables;
 
     (e) acquire, sell, lease, license, mortgage, otherwise encumber or dispose
of any assets outside the ordinary course of business and which involve amounts
in excess of $1,000,000 individually, or $2,000,000 in the aggregate, or enter
into any contract, agreement, commitment or transaction with respect thereto
outside the ordinary course of business consistent with past practice;
 
     (f) create or assume any Lien on any material asset, other than in the
ordinary course consistent with past practice;
 
     (g) declare, set aside, make or pay any dividend or other distribution,
payable in cash, stock, property or otherwise, with respect to any of its
capital stock (except for dividends paid by any wholly-owned Subsidiary of
Amerin to Amerin or to any other wholly-owned Subsidiary of Amerin in the
ordinary course) or repurchase, redeem or acquire any of its outstanding shares
of capital stock, or enter into any agreement with respect to the voting of its
capital stock;
 
     (h) (i) incur any indebtedness for borrowed money or issue any debt
securities to assume, guarantee or endorse, or otherwise as an accommodation
become responsible for, the obligations of any person for borrowed money, except
for (A) indebtedness incurred to refinance any existing indebtedness of CMAC,
Amerin or any of their respective Subsidiaries in connection with the Merger or
(B) other indebtedness for borrowed money with a maturity of not more than one
year in a principal amount not, in the aggregate, in excess of $1,000,000, (ii)
terminate, cancel or request any material change in, or agree to any material
change in, any Amerin Significant Agreement or, except in connection with
transactions permitted under this Section 5.01, enter into any contract or
agreement material to the business, results of operations or financial condition
of Amerin and its Subsidiaries taken as a whole, in either case other than in
the ordinary course of business, consistent with past practice, (iii) make or
authorize any capital expenditure, other than capital expenditures that are not,
in the aggregate, in excess of $1,000,000 for Amerin and its Subsidiaries taken
as a whole; or (iv) enter into or amend any contract, agreement, commitment or
arrangement that, if fully performed, would not be permitted under this Section
5.01;
 
     (i) make any material loan, advance or capital contributions to or
investments in any person other than loans, advances or capital contributions to
or investments in wholly-owned Subsidiaries of Amerin made in the ordinary
course consistent with past practices;
 
     (j) change any of its investment policies or any of the accounting
principles, practices, methods or policies (including but not limited to any
reserving methods, practices or policies) used by it, except as
 
                                      I-27
<PAGE>   121
 
may be required as a result of a change in law, GAAP, SAP or Regulation S-X
promulgated under the Securities Act and Exchange Act;
 
     (k) change the method of determining the GAAP reserves for any guaranty
fund assessment, special insurance assessment or similar assessment or tax;
 
     (l) pay, discharge or satisfy any material claims, liabilities or
obligations (absolute, accrued, asserted or unasserted, contingent or
otherwise), other than the payment, discharge or satisfaction in the ordinary
course of business consistent with past practice or in accordance with their
terms of liabilities reflected or reserved against in the consolidated financial
statements (or the notes thereto) of Amerin and its Subsidiaries or incurred in
the ordinary course of business consistent with past practice;
 
     (m) make any Tax election or settle or compromise any material Tax
liability;
 
     (n) (i) increase the compensation payable or to become payable to its
officers or employees (except for increases in accordance with past practices in
salaries or wages of employees of Amerin or any of its Subsidiaries), (ii) grant
any rights to severance or termination pay to, or enter into any employment or
severance agreement with, any director, officer or other employee of Amerin or
any Subsidiary, or establish, adopt, enter into or amend any collective
bargaining, bonus, profit sharing, thrift, compensation, employment,
termination, severance or other plan, agreement, trust, fund, policy or
arrangement for the benefit of any director, officer or employee, except as
contemplated by this Agreement or to the extent required by applicable law or
the terms of a collective bargaining agreement, (iii) increase the benefits
payable under any existing severance or termination pay policies or employment
agreements, (iv) enter into any employment, deferred compensation or other
similar agreement (or amendment to any such existing agreement), (v) take any
affirmative action to accelerate the vesting of any stock-based compensation or
(vi) make any loans or advances to any directors, officers or employees, except
in connection with transfers or for ordinary travel and business expenses in the
ordinary course of business consistent with past practice;
 
     (o) (i) enter into any reinsurance contract, other than in the ordinary
course of business consistent with past practice, or (ii) enter into any treaty
reinsurance contract, or (iii) commute any reinsurance contract, or (iv) enter
into or commute any reinsurance contract purchased by any Subsidiary of Amerin,
except where required by a Regulator or a Governmental Entity;
 
     (p) enter into, extend or renew any traditional or modified pool insurance
policy, transaction or arrangement, other than in the ordinary course of
business consistent with past practice;
 
     (q) take any action that would or would reasonably be expected to make any
representation and warranty of Amerin hereunder untrue in any material respect
at, or as of any time prior to, the Effective Time; or
 
     (r) agree or commit to do any of the foregoing.
 
     SECTION 5.02. Conduct of CMAC. CMAC agrees that from the date hereof until
the Effective Time, except as set forth in Section 5.02 of the CMAC Schedule of
Exceptions or as otherwise contemplated by this Agreement or with the prior
written consent of Amerin, CMAC and its Subsidiaries shall conduct their
business in the ordinary course consistent with past practice and shall use
their reasonable best efforts to preserve intact their business organizations
and relationships with third parties and to keep available the services of their
present officers and employees. Without limiting the generality of the
foregoing, from the date hereof until the Effective Time, except as set forth in
Section 5.02 of the CMAC Schedule of Exceptions or as otherwise contemplated by
this Agreement or with the prior written consent of Amerin, CMAC will not, and
will not permit any of its Subsidiaries to:
 
     (a) adopt or propose any change in its certificate of incorporation or
bylaws or equivalent documents, except as contemplated by this Agreement;
 
                                      I-28
<PAGE>   122
 
     (b) amend any material term of any outstanding security of CMAC or any of
its Subsidiaries, or reclassify, combine, split, subdivide or redeem, purchase
or otherwise acquire, directly or indirectly, any of its capital stock;
 
     (c) merge or consolidate with any other person;
 
     (d) issue, sell, pledge, dispose of, grant, transfer, lease, license,
guarantee, encumber, or authorize the issuance, sale, pledge, disposition,
grant, transfer, lease, license, guarantee or encumbrance of (i) any shares of
capital stock of CMAC or any of its Subsidiaries of any class, or securities
convertible or exchangeable or exercisable for any shares of such capital stock,
or any options, warrants or other rights of any kind to acquire any shares of
such capital stock or such convertible or exchangeable securities, or any other
ownership interest of CMAC or any of its Subsidiaries or (ii) except in the
ordinary course of business and in a manner consistent with past practice, any
property or assets of CMAC or any of its Subsidiaries, except (A) the issuance
of CMAC Stock upon the exercise of CMAC options, (B) the award of options in the
ordinary course of business and consistent with past practice, (C) pursuant to
contracts or agreements in force at the date of this Agreement or (D) sales,
transfers or dispositions of receivables in connection with the securitization
of such receivables;
 
     (e) acquire, sell, lease, license, mortgage, otherwise encumber or dispose
of any assets outside the ordinary course of business and which involve amounts
in excess of $1,000,000 individually, or $2,000,000 in the aggregate, or enter
into any contract, agreement, commitment or transaction with respect thereto
outside the ordinary course of business consistent with past practice;
 
     (f) create or assume any Lien on any material asset, other than in the
ordinary course consistent with past practice;
 
     (g) except for a redemption of the $4.125 Preferred Stock in order to
comply with the condition set forth in Section 6.01(h), declare, set aside, make
or pay any dividend or other distribution, payable in cash, stock, property or
otherwise, with respect to any of its capital stock (except for dividends paid
by any wholly-owned Subsidiary of CMAC to CMAC or to any other wholly-owned
Subsidiary of CMAC in the ordinary course and except for regular quarterly cash
dividends of $.03 per share on the CMAC Stock or regular quarterly cash
dividends of $1.03125 per share on the $4.125 Preferred Stock) or repurchase,
redeem or acquire any of its outstanding shares of capital stock, or enter into
any agreement with respect to the voting of its capital stock;
 
     (h) (i) incur any indebtedness for borrowed money or issue any debt
securities to assume, guarantee or endorse, or otherwise as an accommodation
become responsible for, the obligations of any person for borrowed money, except
for (A) indebtedness incurred to refinance any existing indebtedness of CMAC,
Amerin or any of their respective Subsidiaries in connection with the Merger,
(B) other indebtedness for borrowed money with a maturity of not more than one
year in a principal amount not, in the aggregate, in excess of $1,000,000, (C)
indebtedness incurred to finance the payment by CMAC of the dividends on the
$4.125 Preferred Stock permitted by Section 5.02(g) or (D) indebtedness in the
form of variable rate subordinated notes issued to depository institution
customers of Commonwealth Mortgage Assurance Company in the ordinary course of
business, (ii) terminate, cancel or request any material change in, or agree to
any material change in, any CMAC Significant Agreement or, except in connection
with transactions permitted under this Section 5.02, enter into any contract or
agreement material to the business, results of operations or financial condition
of Amerin and its Subsidiaries taken as a whole, in either case other than in
the ordinary course of business, consistent with past practice, (iii) make or
authorize any capital expenditure, other than capital expenditures that are not,
in the aggregate, in excess of $1,000,000 for CMAC and its Subsidiaries taken as
a whole; or (iv) enter into or amend any contract, agreement, commitment or
arrangement that, if fully performed, would not be permitted under this Section
5.02;
 
     (i) make any material loan, advance or capital contributions to or
investments in any person other than loans, advances or capital contributions to
or investments in wholly-owned Subsidiaries of CMAC made in the ordinary course
consistent with past practices;
 
                                      I-29
<PAGE>   123
 
     (j) change any of its investment policies or any of the accounting
principles, practices, methods or policies (including but not limited to any
reserving methods, practices or policies) used by it, except as may be required
as a result of a change in law, GAAP, SAP or Regulation S-X promulgated under
the Securities Act and Exchange Act;
 
     (k) change the method of determining the GAAP reserves for any guaranty
fund assessment, special insurance assessment or similar assessment or tax;
 
     (l) pay, discharge or satisfy any material claims, liabilities or
obligations (absolute, accrued, asserted or unasserted, contingent or
otherwise), other than the payment, discharge or satisfaction in the ordinary
course of business consistent with past practice or in accordance with their
terms of liabilities reflected or reserved against in the consolidated financial
statements (or the notes thereto) of CMAC and its Subsidiaries or incurred in
the ordinary course of business consistent with past practice;
 
     (m) make any Tax election or settle or compromise any material Tax
liability;
 
     (n) (i) increase the compensation payable or to become payable to its
officers or employees (except for increases in accordance with past practices in
salaries or wages of employees of CMAC or any of its Subsidiaries), (ii) grant
any rights to severance or termination pay to, or enter into any employment or
severance agreement with, any director, officer or other employee of CMAC or any
Subsidiary, or establish, adopt, enter into or amend any collective bargaining,
bonus, profit sharing, thrift, compensation, employment, termination, severance
or other plan, agreement, trust, fund, policy or arrangement for the benefit of
any director, officer or employee, except as contemplated by this Agreement or
to the extent required by applicable law or the terms of a collective bargaining
agreement, (iii) increase the benefits payable under any existing severance or
termination pay policies or employment agreements, (iv) enter into any
employment, deferred compensation or other similar agreement (or amendment to
any such existing agreement), (v) take any affirmative action to accelerate the
vesting of any stock-based compensation or (vi) make any loans or advances to
any directors, officers or employees, except in connection with transfers or for
ordinary travel and business expenses in the ordinary course of business
consistent with past practice;
 
     (o) (i) enter into any reinsurance contract, other than in the ordinary
course of business consistent with past practice, or (ii) enter into any treaty
reinsurance contract, or (iii) commute any reinsurance contract, or (iv) enter
into or commute any reinsurance contract purchased by any Subsidiary of CMAC,
except where required by a Regulator or a Governmental Entity;
 
     (p) enter into any traditional or modified pool insurance policy,
transaction or arrangement, other than in the ordinary course of business
consistent with past practice;
 
     (q) take any action that would or would reasonably be expected to make any
representation and warranty of CMAC hereunder untrue in any material respect at,
or as of any time prior to, the Effective Time; or
 
     (r) agree or commit to do any of the foregoing.
 
     SECTION 5.03. Stockholder Meetings; Proxy Materials; Form S-4. (a) Amerin
shall cause a meeting of its stockholders (the "AMERIN STOCKHOLDER MEETING") to
be duly called and held as soon as reasonably practicable after the date of this
Agreement for the purpose of voting on the approval and adoption of this
Agreement and the Merger (the "AMERIN STOCKHOLDER APPROVAL"). Subject to Section
5.09, the Amerin Board shall recommend approval and adoption of this Agreement
and the Merger by Amerin's stockholders. In connection with the Amerin
Stockholder Meeting, Amerin (i) will promptly prepare and file with the SEC,
will use its best efforts to have cleared by the SEC and will thereafter mail to
its stockholders as promptly as practicable the Joint Proxy Statement and all
other proxy materials for such meeting, (ii) will use its best efforts to obtain
the Amerin Stockholder Approval and (iii) will otherwise comply with all legal
requirements applicable to such meeting.
 
     (b) CMAC shall cause a meeting of its stockholders (the "CMAC STOCKHOLDER
MEETING") to be duly called and held as soon as reasonably practicable after the
date of this Agreement for the purpose of
 
                                      I-30
<PAGE>   124
 
voting on the approval and adoption of this Agreement and the Merger and the
issuance of CMAC Stock pursuant to the Agreement (the "CMAC STOCKHOLDER
APPROVAL"). Subject to Section 5.10, the CMAC Board shall recommend approval and
adoption of this Agreement, the Merger and the issuance of CMAC Stock pursuant
to this Agreement by CMAC's stockholders. In connection with the CMAC
Stockholder Meeting, CMAC (i) will promptly prepare and file with the SEC, will
use its best efforts to have cleared by the SEC and will thereafter mail to its
stockholders as promptly as practicable the Joint Proxy Statement and all other
proxy materials for such meeting, (ii) will use its best efforts to obtain the
CMAC Stockholder Approval and (iii) will otherwise comply with all legal
requirements applicable to such meeting.
 
     (c) Amerin and CMAC shall cooperate and promptly prepare and CMAC shall
file with the SEC as soon as practicable the Registration Statement, a portion
of which Registration Statement shall also serve as the Joint Proxy Statement.
The respective parties will cause the Joint Proxy Statement and the Registration
Statement to comply as to form in all material respects with the applicable
provisions of the Securities Act, the Exchange Act and the rules and regulations
thereunder. CMAC shall use its best efforts, and Amerin will cooperate with
CMAC, to have the Registration Statement declared effective by the SEC as
promptly as practicable. CMAC shall use its best efforts to obtain, prior to the
effective date of the Registration Statement, all necessary state securities law
or "blue sky" permits or approvals required to carry out the transactions
contemplated by this Agreement and Amerin shall provide all reasonable
assistance requested by CMAC in connection therewith. No amendment or supplement
to the Joint Proxy Statement will be made by Amerin or CMAC without the approval
of the other party, which will not be unreasonably withheld. CMAC will advise
Amerin, promptly after it receives notice thereof, of the time when the
Registration Statement has become effective or any supplement or amendment has
been filed, the issuance of any stop order, the suspension of the qualification
of the CMAC Stock issuable in connection with the Merger for offering or sale in
any jurisdiction, or any request by the SEC for amendment of the Joint Proxy
Statement or the Registration Statement or comments thereon and responses
thereto or requests by the SEC for additional information. If at any time prior
to the Effective Time any information relating to Amerin or CMAC, or any of
their respective Affiliates, officers or directors, should be discovered by
Amerin or CMAC which should be set forth in an amendment or supplement to any of
the Registration Statement or the Joint Proxy Statement, so that any of such
documents would not include any misstatement of a material fact or omit to state
any material fact necessary to make the statements therein, in light of the
circumstances under which they were made, not misleading, the party which
discovers such information shall promptly notify the other party hereto and an
appropriate amendment or supplement describing such information shall be
promptly filed with the SEC and, to the extent required by law, disseminated to
the stockholders of Amerin and CMAC.
 
     SECTION 5.04. Director and Officer Liability. (a) CMAC agrees that all
rights to indemnification and exculpation from liabilities for acts or omissions
occurring at or prior to the Effective Time now existing in favor of the current
or former directors or officers of Amerin and its Subsidiaries as provided in
their respective certificates of incorporation or bylaws (or comparable
organizational documents) and any indemnification agreements of Amerin, the
existence of which does not constitute a breach of this Agreement, shall be
assumed by CMAC, as the Surviving Corporation in the Merger, without further
action, as of the Effective Time and shall survive the Merger and shall continue
in full force and effect in accordance with their terms. In addition, from and
after the Effective Time, directors and officers of Amerin who become directors
and officers of CMAC will be entitled to the same indemnity rights and
protections as are afforded to other directors and officers of the Surviving
Corporation.
 
     (b) In the event that the Surviving Corporation or any of its successors or
assigns (i) consolidates with or merges into any other person and is not the
continuing or surviving corporation or entity of such consolidation or merger or
(ii) transfers or conveys all or substantially all of its properties and assets
to any person, then, and in each such case, proper provision will be made so
that the successors and assigns of the Surviving Corporation assume the
obligations set forth in this Section 5.04.
 
     (c) For six years after the Effective Time, the Surviving Corporation shall
maintain in effect directors' and officers' liability insurance covering acts or
omissions occurring prior to the Effective Time
 
                                      I-31
<PAGE>   125
 
with respect to those persons who are currently covered by Amerin's directors'
and officers' liability insurance policy on terms with respect to such coverage
and amount which, in the aggregate, are no less favorable than those of Amerin's
current policy in effect on the date hereof; provided that in no event shall the
Surviving Corporation be required to pay more than 175% of the current annual
premium.
 
     (d) The provisions of this Section 5.04 are intended to be for the benefit
of, and will be enforceable by, each indemnified party, his or her heirs and his
or her personal representatives and are in addition to, and not in substitution
for, any other rights to indemnification or contribution that any such person
may have by contract or otherwise.
 
     SECTION 5.05. Registration of Substitute Option Shares. CMAC shall take
such action as is necessary to ensure that the offer and sale of CMAC Stock
pursuant to the Substitute Options is effected in compliance with the Securities
Act, and that the CMAC Stock underlying such Substitute Options is fully
resalable by the holders thereof upon exercise without regard to any holding
period therefor. CMAC shall promptly take any action required to be taken under
foreign or state securities or Blue Sky laws in connection with the issuance of
CMAC Stock pursuant to the Substitute Options.
 
     SECTION 5.06. Stock Exchange Listing. CMAC shall use its best efforts to
cause the shares of CMAC Stock to be issued in connection with the Merger (and
upon the exercise of Substitute Options) to be listed on the NYSE, subject to
official notice of issuance.
 
     SECTION 5.07. Employee Benefits. From and after the Effective Time, the
Surviving Corporation shall cause the employees of Amerin and its Subsidiaries
to receive compensation and employee benefits that are, in the aggregate, no
less generous than those currently received by similarly situated employees of
CMAC and its Subsidiaries.
 
     SECTION 5.08. Access to Information. (a) From the date hereof until the
Effective Time, Amerin will give CMAC, its counsel, financial advisors, auditors
and other authorized representatives reasonable access during normal business
hours to the offices, properties, books and records of Amerin and its
Subsidiaries, will furnish to CMAC, its counsel, financial advisors, auditors
and other authorized representatives such financial and operating data and other
information as such Persons may reasonably request and will instruct Amerin's
employees, auditors, counsel and financial advisors to cooperate with CMAC in
its investigation of the business of Amerin and its Subsidiaries; provided that
no investigation pursuant to this Section shall affect any representation or
warranty given by Amerin to CMAC hereunder. Such information shall be held in
confidence to the extent required by, and in accordance with, the provisions of
the confidentiality agreement dated July 29, 1997 between CMAC and Amerin (the
"CONFIDENTIALITY AGREEMENT").
 
     (b) From the date hereof until the Effective Time, CMAC will give Amerin,
its counsel, financial advisors, auditors and other authorized representatives
reasonable access during normal business hours to the offices, properties, books
and records of CMAC and its Subsidiaries, will furnish to Amerin, its counsel,
financial advisors, auditors and other authorized representatives such financial
and operating data and other information as such Persons may reasonably request
and will instruct CMAC's employees, auditors, counsel and financial advisors to
cooperate with Amerin in its investigation of the business of CMAC and its
Subsidiaries; provided that no investigation pursuant to this Section shall
affect any representation or warranty given by CMAC to Amerin hereunder. Such
information shall be held in confidence to the extent required by, and in
accordance with, the Confidentiality Agreement.
 
     SECTION 5.09. Non-Solicitation by Amerin; Other Offers for Amerin.
(a) Amerin agrees that it shall not, nor shall it permit any of its Subsidiaries
to, nor shall it authorize or permit any officer, director or employee or any
investment banker, attorney, accountant, agent or other advisor or
representative of Amerin or any of its Subsidiaries to, (i) solicit, initiate or
knowingly encourage the submission of any Amerin Acquisition Proposal, (ii)
enter into any agreement with respect to any Amerin Acquisition Proposal or
(iii) participate in any discussions or negotiations regarding, or furnish to
any person any information with respect to, or take any other action to
facilitate any inquiries or the making of any proposal that constitutes, or may
reasonably be expected to lead to, any Amerin Acquisition Proposal;
 
                                      I-32
<PAGE>   126
 
provided, however, that Amerin may, in response to unsolicited requests
therefor, participate in discussions or negotiations with, or furnish
information pursuant to a confidentiality agreement no less favorable to such
party than the Confidentiality Agreement to, any person who indicates a
willingness to make a Amerin Superior Proposal and the Amerin Board determines
in good faith after consultation with its financial advisor that such Amerin
Superior Proposal is reasonably capable of being completed on the terms
proposed. For all purposes of this Agreement, "AMERIN ACQUISITION PROPOSAL"
means any proposal for a merger, consolidation, share exchange, business
combination or other similar transaction involving Amerin or any of its
Subsidiaries or any proposal or offer to acquire, directly or indirectly, an
equity interest in, any voting securities of, or a substantial portion of the
assets of, Amerin or any of its Subsidiaries, other than the transactions
contemplated by this Agreement. Amerin immediately shall cease and cause to be
terminated all existing discussions or negotiations with any persons conducted
heretofore with respect to, or that could reasonably be expected to lead to, any
Amerin Acquisition Proposal.
 
     (b) Neither the Amerin Board nor any committee thereof shall (i) withdraw
or modify, or propose to withdraw or modify, in a manner adverse to CMAC, the
approval or recommendation by the Amerin Board or any such committee of this
Agreement and the transactions contemplated by this Agreement or (ii) approve or
recommend, or propose to approve or recommend, any Amerin Acquisition Proposal.
Notwithstanding the foregoing, (i) the Amerin Board may approve or recommend a
Amerin Superior Proposal (and, in connection therewith, withdraw or modify its
approval or recommendation of this Agreement or the Merger) if the Amerin Board
determines in good faith, after taking into account its fiduciary duties, that
such action is in the best interests of Amerin's stockholders and (ii) nothing
contained in this Agreement shall prevent the Amerin Board from complying with
Rule 14d-9 and Rule 14e-2 promulgated under the Exchange Act with regard to a
Amerin Acquisition Proposal. For all purposes of this Agreement, "AMERIN
SUPERIOR PROPOSAL" means a bona fide written proposal made by a third party to
acquire Amerin pursuant to a tender or exchange offer, a merger, a share
exchange, a sale of all or substantially all its assets or otherwise on terms
which a majority of the members of the Amerin Board determines in good faith,
after taking into account the advice of independent financial advisors and after
taking into account the strategic benefits anticipated to be derived from the
Merger and the prospects of CMAC and Amerin as a combined company, to be more
favorable over the long term to Amerin and its stockholders than the Merger and
for which financing, to the extent required, is then fully committed or
reasonably determined to be available by the Amerin Board.
 
     (c) Amerin shall notify CMAC promptly (but in no event later than 24 hours)
after receipt by Amerin or any of its advisors of a Amerin Acquisition Proposal
or any request for nonpublic information in connection with a Amerin Acquisition
Proposal or for access to the properties, books or records of Amerin or any of
its Subsidiaries by any person that informs CMAC or any of its advisors that it
is considering making, or has made, a Amerin Acquisition Proposal. Such notice
to CMAC shall be made orally and in writing and shall indicate the identity of
the offeror and the terms and conditions of such proposal, inquiry or contact.
Amerin shall keep CMAC informed, on a current basis, of the status and details
(including amendments or proposed amendments) of any such Amerin Acquisition
Proposal or request and the status of any negotiations or discussions.
 
     SECTION 5.10. Non-Solicitation by CMAC; Other Offers for CMAC. (a) CMAC
agrees that it shall not, nor shall it permit any of its Subsidiaries to, nor
shall it authorize or permit any officer, director or employee or any investment
banker, attorney, accountant, agent or other advisor or representative of CMAC
or any of its Subsidiaries to, (i) solicit, initiate or knowingly encourage the
submission of any CMAC Acquisition Proposal, (ii) enter into any agreement with
respect to any CMAC Acquisition Proposal or (iii) participate in any discussions
or negotiations regarding, or furnish to any person any information with respect
to, or take any other action to facilitate any inquiries or the making of any
proposal that constitutes, or may reasonably be expected to lead to, any CMAC
Acquisition Proposal; provided, however, that CMAC may, in response to
unsolicited requests therefor, participate in discussions or negotiations with,
or furnish information pursuant to a confidentiality agreement no less favorable
to such party than the Confidentiality Agreement to, any person who indicates a
willingness to make a CMAC Superior Proposal and the CMAC Board determines in
good faith after consultation with its
 
                                      I-33
<PAGE>   127
 
financial advisor that such CMAC Superior Proposal is reasonably capable of
being completed on the terms proposed. For all purposes of this Agreement, "CMAC
ACQUISITION PROPOSAL" means any proposal for a merger, consolidation, share
exchange, business combination or other similar transaction involving CMAC or
any of its Subsidiaries or any proposal or offer to acquire, directly or
indirectly, an equity interest in, any voting securities of, or a substantial
portion of the assets of, CMAC or any of its Subsidiaries, other than the
transactions contemplated by this Agreement. CMAC immediately shall cease and
cause to be terminated all existing discussions or negotiations with any persons
conducted heretofore with respect to, or that could reasonably be expected to
lead to, any CMAC Acquisition Proposal.
 
     (b) Neither the CMAC Board nor any committee thereof shall (i) withdraw or
modify, or propose to withdraw or modify, in a manner adverse to Amerin, the
approval or recommendation by the CMAC Board or any such committee of this
Agreement and the transactions contemplated by this Agreement or (ii) approve or
recommend, or propose to approve or recommend, any CMAC Acquisition Proposal.
Notwithstanding the foregoing, (i) the CMAC Board may approve or recommend a
CMAC Superior Proposal (and, in connection therewith, withdraw or modify its
approval or recommendation of this Agreement or the Merger) if the CMAC Board
determines in good faith, after taking into account its fiduciary duties, that
such action is in the best interests of CMAC's stockholders and (ii) nothing
contained in this Agreement shall prevent the CMAC Board from complying with
Rule 14d-9 and Rule 14e-2 promulgated under the Exchange Act with regard to a
CMAC Acquisition Proposal. For all purposes of this Agreement, "CMAC SUPERIOR
PROPOSAL" means a bona fide written proposal made by a third party to acquire
CMAC pursuant to a tender or exchange offer, a merger, a share exchange, a sale
of all or substantially all its assets or otherwise on terms which a majority of
the members of the CMAC Board determines in good faith, after taking into
account the advice of independent financial advisors and after taking into
account the strategic benefits anticipated to be derived from the Merger and the
prospects of CMAC and Amerin as a combined company, to be more favorable over
the long term to CMAC and its stockholders than the Merger and for which
financing, to the extent required, is then fully committed or reasonably
determined to be available by the CMAC Board.
 
     (c) CMAC shall notify Amerin promptly (but in no event later than 24 hours)
after receipt by CMAC or any of its advisors of a CMAC Acquisition Proposal or
any request for nonpublic information in connection with a CMAC Acquisition
Proposal or for access to the properties, books or records of CMAC or any of its
Subsidiaries by any person that informs CMAC or any of its advisors that it is
considering making, or has made, a CMAC Acquisition Proposal. Such notice to
Amerin shall be made orally and in writing and shall indicate the identity of
the offeror and the terms and conditions of such proposal, inquiry or contact.
CMAC shall keep Amerin informed, on a current basis, of the status and details
(including amendments or proposed amendments) of any such CMAC Acquisition
Proposal or request and the status of any negotiations or discussions.
 
     SECTION 5.11. Notices of Certain Events. (a) Amerin and CMAC shall promptly
notify each other of:
 
          (i) any notice or other communication from any person alleging that
     the consent of such person is or may be required in connection with the
     transactions contemplated by this Agreement; and
 
          (ii) any notice or other communication from any Governmental Entity in
     connection with the transactions contemplated by this Agreement.
 
     (b) Amerin shall promptly notify CMAC of any actions, suits, claims,
investigations or proceedings commenced or, to its Knowledge threatened against,
relating to or involving or otherwise affecting Amerin or any Subsidiary of
Amerin which, if pending on the date of this Agreement, would have been required
to have been disclosed pursuant to Section 3.16 or which relate to the
consummation of the transactions contemplated by this Agreement.
 
     (c) CMAC shall promptly notify Amerin of any actions, suits, claims,
investigations or proceedings commenced or, to its Knowledge threatened against,
relating to or involving or otherwise affecting CMAC or any Subsidiary of CMAC
which, if pending on the date of this Agreement, would have been required to
 
                                      I-34
<PAGE>   128
 
have been disclosed pursuant to Section 4.16 or which relate to the consummation
of the transactions contemplated by this Agreement.
 
     SECTION 5.12. Appropriate Action; Consents; Filings. (a) Subject to the
terms and conditions of this Agreement, Amerin and CMAC shall use their best
efforts to (i) take, or cause to be taken, all actions, and do, or cause to be
done, all things necessary, proper or advisable under applicable laws and
regulations, to consummate the Merger and the other transactions contemplated by
this Agreement as promptly as practicable, (ii) obtain from any Governmental
Entity any Permits required to be obtained or made by CMAC or Amerin or any of
their Subsidiaries in connection with the authorization, execution and delivery
of this Agreement and the consummation of the transactions contemplated herein,
and (iii) make all necessary filings, and thereafter make any other required
submissions, with respect to this Agreement and the Merger required under the
Securities Act and the Exchange Act any other applicable law; provided that
Amerin and CMAC shall cooperate with each other in connection with the making of
all such filings, including providing copies of all such documents to the
non-filing party and its advisors prior to filing and, if requested, accepting
all reasonable additions, deletions or changes suggested in connection
therewith. Amerin and CMAC shall furnish to each other all information required
for any application or other filing to be made pursuant to the rules and
regulations of any applicable law in connection with the transactions
contemplated by this Agreement.
 
     (b) Amerin and CMAC shall give (or shall cause their respective
Subsidiaries to give) any notices to third parties, and use (or shall cause
their respective Subsidiaries to use) all reasonable efforts to obtain any third
party consents (i) necessary, proper or advisable to consummate the transactions
contemplated by this Agreement or (ii) required to prevent the occurrence of a
Material Adverse Effect on Amerin or CMAC. In the event that either party shall
fail to obtain any third party consent described in this Section 5.12(b), such
party shall use all reasonable efforts, and shall take any such actions
reasonably requested by the other party hereto, to minimize any adverse effect
upon Amerin and CMAC, their respective Subsidiaries and their respective
businesses resulting, or which could reasonably be expected to result after the
Effective Time, from the failure to obtain such consent.
 
     (c) No later than 30 days after the date hereof, CMAC shall determine
whether to seek the consent of the holders of the $4.125 Preferred Stock to the
Merger or to redeem the $4.125 Preferred Stock in accordance with its terms and
shall notify Amerin of its decision. Promptly thereafter CMAC shall take all
actions necessary to obtain the required consent or redeem the $4.125 Preferred
Stock, as the case may be, including, without limitation, calling any required
meeting of the holders of $4.125 Preferred Stock or seeking their written
consent (and, in such case, establishing a date by which such consent must be
given), giving all required notices of redemption and obtaining all required
financing required in order to effect the redemption of the $4.125 Preferred
Stock. If CMAC elects to seek the consent of the holders of the $4.125 Preferred
Stock and such holders refuse or fail to give their consent on or before the
date set by CMAC to receive such consent, then, CMAC shall take immediately
thereafter all actions necessary to redeem, as of the Effective Time, the $4.125
Preferred Stock.
 
     SECTION 5.13. Cooperation. CMAC and Amerin shall cooperate with each other
(i) with respect to the timing of the CMAC Stockholder Meeting and the Amerin
Stockholder Meeting and shall use their reasonable efforts to hold such meetings
on the same day, (ii) in connection with the preparation of the Joint Proxy
Statement, (iii) in determining whether any action by or in respect of, or
filing with, any Governmental Entity is required, or any actions, consents,
approvals or waivers are required to be obtained from parties to any material
contracts, in connection with the consummation of the transactions contemplated
by this Agreement, and (iv) in seeking any such actions, consents, approvals or
waivers or making any such filings, furnishing information required in
connection therewith or with the Joint Proxy Statement and seeking timely to
obtain any such actions, consents, approvals or waivers.
 
     SECTION 5.14. Public Announcements. So long as this Agreement is in effect,
CMAC and Amerin will consult with each other before issuing any press release or
making any SEC filing or other public statement with respect to this Agreement
or the transactions contemplated hereby and, except as may be required by
applicable law, court process or any listing agreement with any national
securities exchange,
 
                                      I-35
<PAGE>   129
 
will not issue any such press release or make any such SEC filing or other
public statement prior to such consultation and providing the other party with a
reasonable opportunity to comment thereon.
 
     SECTION 5.15. Affiliates; Pooling of Interests; Reorganization. Within 30
days of the date of this Agreement, each of CMAC and Amerin shall deliver to the
other a letter identifying all persons whom such party believes may be deemed to
be, at the date of the CMAC Stockholder Meeting or the Amerin Stockholder
Meeting, as the case may be, an Affiliate of CMAC or Amerin, as the case may be
under Rule 145 of the Securities Act or under applicable SEC accounting releases
with respect to pooling of interests accounting treatment (each such person, a
"RULE 145 AFFILIATE"). Each of CMAC and Amerin shall use their best efforts to
obtain a written agreement from each person who is identified as a person who
may be deemed to be a Rule 145 Affiliate in the applicable letter referred to
above as soon as practicable and, in any event, within 45 days of the date of
this Agreement, substantially in the form of Exhibit B-1 or B-2, as applicable.
Each of the parties hereto shall use their best efforts to cause the
transactions contemplated by this Agreement to qualify, and shall not knowingly
take any action, except for the transactions contemplated by this Agreement,
which could prevent such transactions from qualifying (i) for pooling of
interests accounting treatment and (ii) as a reorganization within the meaning
of Section 368(a) of the Code.
 
     SECTION 5.16. Takeover Statutes. If any takeover statute is or may become
applicable to the Merger, each of CMAC and Amerin shall take such actions as are
necessary so that the Merger may be consummated as promptly as practicable on
the terms contemplated hereby and otherwise act to eliminate or minimize the
effects of any takeover statute on the Merger.
 
     SECTION 5.17. Employment Agreement. CMAC and Roy J. Kasmar shall enter into
the Employment Agreement no later than the date on which all conditions to the
Merger set forth in Section 6.01 and 6.03 (other than the condition set forth in
Section 6.03(f)) have been satisfied.
 
                                   ARTICLE 6
 
                            CONDITIONS TO THE MERGER
 
     SECTION 6.01. Conditions to the Obligations of Each Party. The obligations
of Amerin and CMAC to consummate the Merger are subject to the satisfaction of
the following conditions:
 
     (a) this Agreement, the Merger and the transactions contemplated by the
this Agreement shall have been approved and adopted by the common stockholders
of Amerin and CMAC in accordance with Delaware Law and applicable stock exchange
rules;
 
     (b) any applicable waiting period under the HSR Act relating to the Merger
and the transactions contemplated by this Agreement shall have expired or been
terminated;
 
     (c) CMAC and Amerin shall have obtained regulatory approvals permitting the
Surviving Corporation to operate in states accounting for more than 90% of the
premiums earned from new insurance written by CMAC and Amerin during the nine
full calendar months immediately preceding the Effective Time; provided that, in
any event, all required approvals in the states set forth in Section 6.01(c) of
the CMAC Schedule of Exceptions shall have been obtained;
 
     (d) no provision of any applicable law or regulation and no judgment,
injunction, order or decree shall prohibit the consummation of the Merger;
 
     (e) the Registration Statement shall have been declared effective by the
SEC and no stop order suspending the effectiveness of the Registration Statement
shall be in effect and no proceedings for such purpose shall be pending before
or threatened by the SEC;
 
     (f) the shares of CMAC Stock to be issued in connection with the Merger and
upon exercise of the Substitute Options shall have been approved for listing on
the NYSE, subject to official notice of issuance;
 
                                      I-36
<PAGE>   130
 
     (g) CMAC and Amerin each shall have received a letter from their respective
independent accountants addressed to CMAC or Amerin, as the case may be, and
dated as of the Closing Date to the effect that the Merger will qualify for
"pooling of interests" accounting treatment under Opinion 16 of the Accounting
Principles Board and applicable SEC rules and regulations; and
 
     (h) The Merger shall have been approved by the holders of at least
two-thirds of the outstanding shares of $4.125 Preferred Stock or all of the
outstanding shares of $4.125 Preferred Stock shall have been redeemed.
 
     SECTION 6.02. Conditions to the Obligations of CMAC. The obligations of
CMAC to consummate the Merger are subject to the satisfaction of the following
further conditions:
 
     (a) the representations and warranties of Amerin set forth in this
Agreement that are qualified as to Material Adverse Effect (including the
representation and warranty set forth in Section 3.12) shall be true and correct
as of the Effective Time and the representations and warranties that are not so
qualified, taken together, shall be true and correct in all material respects,
in each case as though made as of the Effective Time (except to the extent any
such representation or warranty expressly speaks as of an earlier date or time);
and CMAC shall have received a certificate signed on behalf of Amerin by an
executive officer of Amerin to such effect;
 
     (b) Amerin shall have complied in all respects with the covenants contained
in Sections 5.01(a), (b), (c) or (g) and in all material respects with the other
covenants required to be complied with by it under this Agreement and shall have
performed in all material respects each obligation and agreement required to be
performed by it under this Agreement, in each case at or prior to the Effective
Time; and CMAC shall have received a certificate signed on behalf of Amerin by
an executive officer of Amerin to such effect;
 
     (c) CMAC shall have received an opinion of Morgan, Lewis & Bockius LLP, in
form and substance reasonably satisfactory to CMAC and substantially in the form
of Exhibit C (following Morgan, Lewis & Bockius LLP's receipt of representations
of officers of Amerin and CMAC substantially in the form of Exhibits E-1 and
E-2), on the basis of certain facts, representations and assumptions set forth
in such opinion, dated the Closing Date, to the effect that the Merger will be
treated for federal income tax purposes as a reorganization qualifying under the
provisions of Section 368(a) of the Code and that each of CMAC and Amerin will
be a party to the reorganization within the meaning of Section 368(b) of the
Code;
 
     (d) there shall not have been any downgrading of the claims-paying ability
rating of Amerin Guaranty Corporation below the level of "Aa3" as determined by
Moody's Investors Service, Inc. and "AA" as determined by Standard & Poor's
Rating Group, a Division of McGraw-Hill Corporation, nor shall either rating
agency have given any indication of an intention to downgrade Amerin Guaranty
Corporation or Commonwealth Mortgage Assurance Company below "Aa3" or "AA", as
the case may be, in each case after giving effect to the transactions
contemplated by this Agreement; and
 
     (e) there shall not have been any change in either (i) the laws, statutes
or regulations governing Amerin, or (ii) in the interpretation of any laws,
statutes or regulations governing Amerin by a court of competent jurisdiction or
any Governmental Entity that would materially impair the ability of Amerin to
conduct its business in the ordinary course and in a manner consistent with past
practice.
 
     SECTION 6.03. Conditions to the Obligations of Amerin. The obligations of
Amerin to consummate the Merger are subject to the satisfaction of the following
further conditions:
 
     (a) the representations and warranties of CMAC set forth in this Agreement
that are qualified as to Material Adverse Effect (including the representation
and warranty set forth in Section 4.12) shall be true and correct as of the
Effective Time and the representations and warranties that are not so qualified,
taken together, shall be true and correct in all material respects, in each case
as though made as of the Effective Time (except to the extent any such
representation or warranty expressly speaks as of an earlier date or
 
                                      I-37
<PAGE>   131
 
time); and Amerin shall have received a certificate signed on behalf of CMAC by
an executive officer of CMAC to such effect;
 
     (b) CMAC shall have complied in all respects with the covenants contained
in Sections 5.02(a), (b), (c) or (g) and in all material respects with the other
covenants required to be complied with by it under this Agreement and shall have
performed in all material respects each obligation and agreement required to be
performed by it under this Agreement, in each case at or prior to the Effective
Time; and Amerin shall have received a certificate signed on behalf of CMAC by
an executive officer of CMAC to such effect;
 
     (c) Amerin shall have received an opinion of Davis Polk & Wardwell, in form
and substance reasonably satisfactory to Amerin and substantially in the form of
Exhibit D (following Davis Polk & Wardwell's receipt of representations of
officers of Amerin and CMAC substantially in the form of Exhibits E-1 and E-2),
on the basis of certain facts, representations and assumptions set forth in such
opinion, dated the Closing Date, to the effect that the Merger will be treated
for federal income tax purposes as a reorganization qualifying under the
provisions of Section 368(a) of the Code and that each of CMAC and Amerin will
be a party to the reorganization within the meaning of Section 368(b) of the
Code;
 
     (d) there shall not have been any downgrading of the claims-paying ability
rating of Commonwealth Mortgage Assurance Company below the level of "Aa3" as
determined by Moody's Investors Service, Inc. and "AA" as determined by Standard
& Poors Rating Group, a Division of McGraw-Hill Corporation, nor shall either
rating agency have given any indication of an intention to downgrade
Commonwealth Mortgage Assurance Company or Amerin Guaranty Corporation below
"Aa3" or "AA", as the case may be, after giving effect to the transactions
contemplated by this Agreement;
 
     (e) there shall not have been any change in either (i) the laws, statutes
or regulations governing CMAC, or (ii) in the interpretation of any laws,
statutes or regulations governing CMAC by a court of competent jurisdiction or
any Governmental Entity that would materially impair the ability of CMAC to
conduct its business in the ordinary course and in a manner consistent with past
practice; and
 
     (f) CMAC and Roy J. Kasmar shall have executed the Employment Agreement.
 
                                   ARTICLE 7
 
                                  TERMINATION
 
     SECTION 7.01. Termination. This Agreement may be terminated and the Merger
may be abandoned at any time prior to the Effective Time (notwithstanding any
approval of this Agreement and the Merger by the Boards or stockholders of
Amerin or CMAC):
 
     (a) by mutual written agreement of Amerin and CMAC;
 
     (b) by either Amerin or CMAC, if
 
          (i) (x) at the CMAC Stockholder Meeting (or any adjournment or
     postponement thereof), the CMAC Stockholder Approval shall not have been
     obtained or (y) at the Amerin Stockholder Meeting (or any adjournment or
     postponement thereof), the Amerin Stockholder Approval shall not have been
     obtained;
 
          (ii) the Merger has not been consummated on or before June 30, 1999;
     provided that the right to terminate this Agreement pursuant to this
     Section 7.01(b) shall not be available to any party whose breach of or
     failure to perform any provision of this Agreement results in the failure
     of the Merger to be consummated by such time;
 
          (iii) any judgment, injunction, order or decree enjoining any party
     from consummating the Merger shall have been entered and become final and
     non-appealable;
 
                                      I-38
<PAGE>   132
 
          (iv) the Amerin Board shall have determined to recommend a Amerin
     Acquisition Proposal to its stockholders and to enter into a binding
     written agreement concerning such Amerin Acquisition Proposal after
     determining, pursuant to Section 5.09, that such Amerin Acquisition
     Proposal constitutes a Amerin Superior Proposal; provided that Amerin may
     not exercise its right to terminate under this Section 7.01(b)(iv) (and may
     not enter into a binding written agreement with respect to such Amerin
     Acquisition Proposal) unless and until Amerin shall have provided CMAC
     prior written notice at least two business days prior to such termination
     that the Amerin Board has authorized and intends to effect the termination
     of this Agreement pursuant to this Section 7.01(b)(iv), specifying the
     material terms and conditions of such Amerin Acquisition Proposal; or
 
          (v) the CMAC Board shall have determined to recommend a CMAC
     Acquisition Proposal to its stockholders and to enter into a binding
     written agreement concerning such CMAC Acquisition Proposal after
     determining, pursuant to Section 5.10, that such CMAC Acquisition Proposal
     constitutes a CMAC Superior Proposal; provided that CMAC may not exercise
     its right to terminate under this Section 7.01(b)(v) (and may not enter
     into a binding written agreement with respect to such CMAC Acquisition
     Proposal) unless and until CMAC shall have provided Amerin prior written
     notice at least two business days prior to such termination that the CMAC
     Board has authorized and intends to effect the termination of this
     Agreement pursuant to this Section 7.01(b)(v), specifying the material
     terms and conditions of such CMAC Acquisition Proposal;
 
     (c) by CMAC, if:
 
          (i) any of the representations and warranties of Amerin set forth in
     this Agreement that are qualified as to Material Adverse Effect shall fail
     to be true and correct as of the date hereof or any of the other
     representations and warranties of Amerin set forth in this Agreement, taken
     together, shall fail to be true and correct in all material respects as of
     the date hereof and, in either case, either (x) the senior officers of
     Amerin shall have had, as of the date hereof, actual knowledge of such
     failure or (y) such senior officers shall not have had such knowledge and
     such failure could not reasonably be expected to be cured by the Closing
     Date without causing material delay of the Closing or requiring Amerin to
     take an action that would violate the terms of this Agreement or cause any
     of the conditions to closing set forth herein to fail to be satisfied;
     provided that, before exercising any such right to terminate, CMAC shall
     provide Amerin 10 business days prior written notice of its intent to
     terminate, specifying, in reasonable detail, the basis for termination;
 
          (ii) there shall have occurred a breach or failure to perform any
     covenant or agreement set forth in this Agreement that, if not cured by the
     Closing Date, would cause the condition set forth in Section 6.02(b) to
     fail to be satisfied or there shall have occurred any event, or any fact
     shall have arisen that, if not cured by the Closing Date, would cause the
     conditions set forth in Section 6.02(a) to fail to be satisfied and, in
     either case, such breach or failure could not reasonably be expected to be
     cured by the Closing Date, without causing a material delay in the Closing
     or requiring Amerin to take an action that would violate the terms of this
     Agreement or cause another failure of a condition to closing to be
     satisfied, or reasonably could be expected to be cured within such time
     period but Amerin shall fail to pursue expeditiously such cure; provided
     that, before exercising any such right to terminate, CMAC shall provide
     Amerin with 10 business days prior written notice of its intent to
     terminate, specifying in reasonable detail, the basis for termination;
 
          (iii) the Amerin Board shall withdraw or modify, or propose to
     withdraw or modify, in a manner adverse to CMAC, its approval or
     recommendation of this Agreement or the Merger or shall have resolved to do
     so; or
 
          (iv) Amerin or any of its Affiliates shall have materially and
     knowingly breached the covenant contained in Section 5.09;
 
     (d) by Amerin, if:
 
          (i) any of the representations and warranties of CMAC set forth in
     this Agreement that are qualified as to Material Adverse Effect shall fail
     to be true and correct as of the date hereof or any of
 
                                      I-39
<PAGE>   133
 
     the other representations and warranties of CMAC set forth in this
     Agreement, taken together, shall fail to be true and correct in all
     material respects as of the date hereof and, in either case, either (x) the
     senior officers of CMAC shall have had, as of the date hereof, actual
     knowledge of such failure or (y) such senior officers shall not have had
     such knowledge and such failure could not reasonably be expected to be
     cured by the Closing Date without causing material delay of the Closing or
     requiring CMAC to take an action that would violate the terms of this
     Agreement or cause any of the conditions to closing set forth herein to
     fail to be satisfied; provided that, before exercising any such right to
     terminate, Amerin shall provide CMAC 10 business days prior written notice
     of its intent to terminate, specifying, in reasonable detail, the basis for
     termination;
 
          (ii) there shall have occurred a breach or failure to perform any
     covenant or agreement set forth in this Agreement that, if not cured by the
     Closing Date, would cause the condition set forth in Section 6.03(b) to
     fail to be satisfied or there shall have occurred any event, or any fact
     shall have arisen that, if not cured by the Closing Date, would cause the
     conditions set forth in Section 6.03(a) to fail to be satisfied and, in
     either case, such breach or failure could not reasonably be expected to be
     cured by the Closing Date, without causing a material delay in the Closing
     or requiring CMAC to take an action that would violate the terms of this
     Agreement or cause another failure of a condition to closing to be
     satisfied, or reasonably could be expected to be cured within such time
     period but CMAC shall fail to pursue expeditiously such cure; provided
     that, before exercising any such right to terminate, Amerin shall provide
     CMAC with 10 business days prior written notice of its intent to terminate,
     specifying in reasonable detail, the basis for termination;
 
          (iii) the CMAC Board shall withdraw or modify, in a manner adverse to
     Amerin, its approval or recommendation of this Agreement or the Merger or
     shall have resolved to do so; or
 
          (iv) CMAC or any of its Affiliates shall have materially and knowingly
     breached the covenant contained in Section 5.10.
 
     The party desiring to terminate this Agreement pursuant to this Section
7.01 (other than pursuant to Section 7.01(a)) shall give notice of such
termination to the other party.
 
     SECTION 7.02. Effect of Termination. If this Agreement is terminated
pursuant to Section 7.01, this Agreement shall become void and of no effect with
no liability on the part of any party hereto, except that (i) the agreements
contained in Sections 7.03, 8.04, 8.06, 8.07 and 8.08 and this Section 7.02
shall survive the termination hereof and (ii) no such termination shall release
any party of any liabilities or damages resulting from any willful or grossly
negligent breach by that party of any provision of this Agreement.
 
     SECTION 7.03. Certain Fees. (a) In addition to any amount payable pursuant
to Section 7.02, Amerin shall pay to CMAC, as a fee and in reimbursement of
expenses relating to the transactions contemplated by this Agreement,
$22,000,000 upon the termination of this Agreement pursuant to Section
7.01(b)(iv), 7.01(c)(iii) or 7.01(c)(iv). Such payment shall be made within two
business days of any such termination.
 
     (b) In addition to any amount payable pursuant to Section 7.02, CMAC shall
pay to Amerin, as a fee and in reimbursement of expenses relating to the
transactions contemplated by this Agreement, $22,000,000 upon the termination of
this Agreement pursuant to Section 7.01(b)(v), 7.01(d)(iii) or 7.01(d)(iv). Such
payment shall be made within two business days of any such termination.
 
                                   ARTICLE 8
 
                                 MISCELLANEOUS
 
     SECTION 8.01. Notices. All notices, requests and other communications to
any party hereunder shall be in writing (including facsimile transmission) and
shall be given,
 
                                      I-40
<PAGE>   134
 
         if to CMAC, to:
 
         CMAC Investment Corporation
         1601 Market Street
         Philadelphia, PA 19103
         Attention: Howard S. Yaruss, Esq.
         Facsimile No.: (215) 405-9160
 
         with a copy to:
 
         Morgan, Lewis & Bockius LLP
         1701 Market Street
         Philadelphia, Pennsylvania 19103
         Attention: James W. McKenzie, Jr., Esq.
         Facsimile No.: (215) 963-5299
 
         if to Amerin, to:
 
         Amerin Corporation
         200 East Randolph Drive
         49th Floor
         Chicago, Illinois 60601
         Attention: Randolph C. Sailer II, Esq.
         Facsimile No.: (312) 540-3978
 
         with a copy to:
 
         Davis Polk & Wardwell
         450 Lexington Avenue
         New York, New York 10017
         Attention: Diane G. Kerr, Esq.
         Facsimile No.: (212) 450-5590
 
or such other address or fax number as such party may hereafter specify for the
purpose by notice to the other parties hereto. All such notices, requests and
other communications shall be deemed received on the date of receipt by the
recipient thereof if received prior to 5 p.m. in the place of receipt and such
day is a business day in the place of receipt. Otherwise, any such notice,
request or communication shall be deemed not to have been received until the
next succeeding business day in the place of receipt.
 
     SECTION 8.02. Nonsurvival of Representations, Warranties, Covenants and
Agreements. None of the representations, warranties, covenants and agreements
contained herein or in any certificate or other writing delivered pursuant
hereto shall survive the Effective Time, except for covenants and agreements
which, by their terms, are to be performed after the Effective Time.
 
     SECTION 8.03. Amendments; No Waivers. (a) Any provision of this Agreement
may be amended or waived prior to the Effective Time if, but only if, such
amendment or waiver is in writing and is signed, in the case of an amendment, by
each party to this Agreement or in the case of a waiver, by the party against
whom the waiver is to be effective; provided that after the adoption of this
Agreement by the stockholders of either Amerin or CMAC, there shall be made no
amendment that by law requires further approval by such stockholders without
such further approval.
 
     (b) No failure or delay by any party in exercising any right, power or
privilege hereunder shall operate as a waiver thereof nor shall any single or
partial exercise thereof preclude any other or further exercise thereof or the
exercise of any other right, power or privilege. The rights and remedies herein
provided shall be cumulative and not exclusive of any rights or remedies
provided by law.
 
     SECTION 8.04. Expenses. Except as otherwise provided in this Agreement, all
costs and expenses incurred in connection with this Agreement shall be paid by
the party incurring such cost or expense.
 
     SECTION 8.05. Successors and Assigns. The provisions of this Agreement
shall be binding upon and inure to the benefit of the parties hereto and their
respective successors and assigns; provided that no party
 
                                      I-41
<PAGE>   135
 
may assign, delegate or otherwise transfer any of its rights or obligations
under this Agreement without the consent of each other party hereto.
 
     SECTION 8.06. Governing Law. This Agreement shall be governed by and
construed in accordance with the law of the State of Delaware, without regard to
principles of conflicts of laws.
 
     SECTION 8.07. Jurisdiction. Any suit, action or proceeding seeking to
enforce any provision of, or based on any matter arising out of or in connection
with, this Agreement or the transactions contemplated hereby may be brought in
any federal court located in the State of Delaware or any Delaware state court,
and each of the parties hereby consents to the jurisdiction of such courts (and
of the appropriate appellate courts therefrom) in any such suit, action or
proceeding and irrevocably waives, to the fullest extent permitted by law, any
objection which it may now or hereafter have to the laying of the venue of any
such suit, action or proceeding in any such court or that any such suit, action
or proceeding which is brought in any such court has been brought in an
inconvenient form. Process in any such suit, action or proceeding may be served
on any party anywhere in the world, whether within or without the jurisdiction
of any such court. Without limiting the foregoing, each party agrees that
service of process on such party as provided in Section 8.01 shall be deemed
effective service of process on such party.
 
     SECTION 8.08. Waiver of Jury Trial. EACH OF THE PARTIES HERETO HEREBY
IRREVOCABLY WAIVES ANY AND ALL RIGHT TO TRIAL BY JURY IN ANY LEGAL PROCEEDING
ARISING OUT OF OR RELATED TO THIS AGREEMENT OR THE TRANSACTIONS CONTEMPLATED
HEREBY.
 
     SECTION 8.09. Counterparts; Effectiveness. This Agreement may be signed in
any number of counterparts, each of which shall be an original, with the same
effect as if the signatures thereto and hereto were upon the same instrument.
This Agreement shall become effective when each party hereto shall have received
counterparts hereof signed by all of the other parties hereto. Except for
Section 5.04 hereof, no provision of this Agreement is intended to confer upon
any person other than the parties hereto any rights or remedies hereunder.
 
     SECTION 8.10. Entire Agreement. This Agreement and the Confidentiality
Agreement constitute the entire agreement between the parties with respect to
the subject matter of this Agreement and supersedes all prior agreements and
understandings, both oral and written, between the parties with respect to the
subject matter hereof and thereof.
 
     SECTION 8.11. Captions. The captions herein are included for convenience of
reference only and shall be ignored in the construction or interpretation hereof
 
     SECTION 8.12. Severability. If any term, provision, covenant or restriction
of this Agreement is held by a court of competent jurisdiction or other
authority to be invalid, void or unenforceable, the remainder of the terms,
provisions, covenants and restrictions of this Agreement shall remain in full
force and effect and shall in no way be affected, impaired or invalidated so
long as the economic or legal substance of the transactions contemplated hereby
is not affected in any manner materially adverse to any parts. Upon such a
determination, such term, provision, covenant or restriction shall be deemed
reformed in such jurisdiction to the maximum limitations permitted by the
applicable law of such jurisdiction.
 
     SECTION 8.13. Specific Performance. The parties hereto agree that
irreparable damage would occur in the event any provision of this Agreement was
not performed in accordance with the terms hereof and that the parties shall be
entitled to specific performance of the terms hereof in addition to any other
remedy to which they are entitled at law or in equity.
 
     SECTION 8.14. Definitions and Usage. (a) For purposes of this Agreement:
 
     "AFFILIATE" means, with respect to any person, any other person directly or
indirectly controlling, controlled by, or under common control with such person.
The term "control" means possession, directly or indirectly, of the power to
direct or cause the direction of the management or policies of a person, whether
through the ownership of voting securities, by contract or otherwise.
 
                                      I-42
<PAGE>   136
 
     "BOARD" means with respect to any corporation the Board of Directors of
such corporation.
 
     "EMPLOYMENT AGREEMENT" means the employment agreement to be executed
between CMAC and Roy J. Kasmar, substantially in accordance with the terms set
forth on Exhibit F.
 
     "GAAP" means U.S. generally accepted accounting principles.
 
     "KNOWLEDGE" of any person which is not an individual means the Knowledge of
such person's officers after reasonable inquiry.
 
     "MATERIAL ADVERSE EFFECT" means with respect to CMAC or Amerin a material
adverse effect (i) on the business, properties, assets, liabilities (contingent
or otherwise), condition (financial or otherwise) or results of operations of
CMAC and its Subsidiaries, taken as a whole, or Amerin and its Subsidiaries,
taken as a whole, as the case may be, or (ii) on the ability of CMAC or Amerin,
as the case may be, to perform its obligations under, or to consummate the
transactions contemplated by, this Agreement.
 
     "OFFICER" means, in the case of CMAC and Amerin, any executive officer of
CMAC or Amerin, as applicable, within the meaning of Rule 3b-7 of the Exchange
Act.
 
     "PERSON" means an individual, corporation, partnership, limited liability
company, association, trust or other entity or organization, including a
government or political subdivision or an agency or instrumentality thereof.
 
     "SAP" means the accounting procedures and practices prescribed or permitted
from time to time by the National Association of Insurance Commissioners and
adopted, permitted or promulgated by the respective states of incorporation of
Amerin and its Subsidiaries or CMAC and its Subsidiaries, as the case may be,
and employed in a consistent manner throughout the periods involved.
 
     "SUBSIDIARY" means, with respect to any person, any entity of which
securities or other ownership interests having ordinary voting power to elect a
majority of the Board or other persons performing similar functions are at any
time directly or indirectly owned by such person.
 
     A reference in this Agreement to any statute shall be to such statute as
amended from time to time, and to the rules and regulations promulgated
thereunder.
 
     (b) Each of the following terms is defined in the Section set forth
opposite such term:
 
<TABLE>
<CAPTION>
TERM                                                            SECTION
- ----                                                            -------
<S>                                                           <C>
$4.125 Preferred Stock......................................  4.05
Affiliate...................................................  8.14(a)
Agreement...................................................  Preamble
Amerin......................................................  Preamble
Amerin 10-K.................................................  3.09(a)(i)
Amerin 10-Q.................................................  3.09(a)(iv)
Amerin Annual Statements....................................  3.10(b)
Amerin Acquisition Proposal.................................  5.09
Amerin Annual Statements....................................  3.10(b)
Amerin Balance Sheet........................................  3.10(a)
Amerin Balance Sheet Date...................................  3.10(a)
Amerin Director Designees...................................  2.03
Amerin Employee Plans.......................................  3.22(a)
Amerin Existing Reinsurance Agreements......................  3.17(b)
Amerin Returns..............................................  3.21(i)
Amerin SEC Filings..........................................  3.09(a)(iv)
Amerin Significant Agreements...............................  3.15(b)
Amerin Stock................................................  1.02(a)
</TABLE>
 
                                      I-43
<PAGE>   137
 
<TABLE>
<CAPTION>
TERM                                                            SECTION
- ----                                                            -------
<S>                                                           <C>
Amerin Stockholder Approval.................................  5.03(a)
Amerin Stockholder Meeting..................................  5.03(a)
Amerin Stockholder Rights...................................  1.02(a)
Amerin Superior Proposal....................................  5.09(b)
Amerin Unaudited September Balance Sheet....................  3.10(a)
Certificate of Merger.......................................  1.01(c)
Certificates................................................  1.04(a)
Closing.....................................................  1.04(b)
Closing Date................................................  1.04(b)
CMAC........................................................  Preamble
CMAC 10-K...................................................  4.09(a)(i)
CMAC 10-Q...................................................  4.09(a)(iv)
CMAC Annual Statements......................................  4.10(b)
CMAC Acquisition Proposal...................................  5.10
CMAC Balance Sheet..........................................  4.10(a)
CMAC Balance Sheet Date.....................................  4.10(a)
CMAC Director Designees.....................................  2.03
CMAC Employee Plans.........................................  4.22(a)(ii)
CMAC Existing Reinsurance Agreements........................  4.17(b)
CMAC Retirement Plans.......................................  4.22(c)
CMAC Returns................................................  4.21(i)
CMAC SEC Filings............................................  4.09(a)(iv)
CMAC Significant Agreements.................................  4.15(b)
CMAC Stock..................................................  1.02(a)
CMAC Stockholder Approval...................................  5.03(b)
CMAC Stockholder Meeting....................................  5.03(b)
CMAC Stockholder Rights.....................................  1.02(a)
CMAC Superior Proposal......................................  5.10(b)
CMAC Unaudited September Balance Sheet......................  4.10(a)
Code........................................................  Preamble
Confidentiality Agreement...................................  5.08(a)
Corporation.................................................  2.01
Delaware Law................................................  1.01(a)
DLJ.........................................................  3.19
Effective Time..............................................  1.01(c)
Employment Agreement........................................  8.14(a)
Environmental Laws..........................................  3.23(b)
Environmental Permits.......................................  3.23(b)
ERISA.......................................................  3.22(a)
ERISA Affiliate.............................................  3.22(a)
Exchange Act................................................  3.03(ii)
Exchange Agent..............................................  1.04(a)
Exchange Ratio..............................................  1.02(a)
Existing Reinsurance Agreements.............................  3.17(b)
GAAP........................................................  8.14(a)
Governmental Entity.........................................  3.03
HSR Act.....................................................  3.03(a)(ii)
Intellectual Property.......................................  3.23(b)
</TABLE>
 
                                      I-44
<PAGE>   138
 
<TABLE>
<CAPTION>
TERM                                                            SECTION
- ----                                                            -------
<S>                                                           <C>
Investment Assets...........................................  3.13(b)
IRS.........................................................  3.21
Joint Proxy Statement.......................................  3.11
Knowledge...................................................  8.14(a)
Lien........................................................  3.04
Material Adverse Effect.....................................  8.14(a)
Merger......................................................  1.01(a)
Merger Consideration........................................  1.02(a)
Multiemployer Plan..........................................  3.22(c)
Nonvoting Amerin Stock......................................  3.05
NYSE........................................................  1.07
officer.....................................................  8.14(a)
Permits.....................................................  3.08(a)
person......................................................  8.14(a)
Registration Statement......................................  3.11
Regulators..................................................  3.10(b)
Rule 145 Affiliate..........................................  5.15
SAP.........................................................  8.14(a)
SEC.........................................................  3.09(a)(iv)
Securities Act..............................................  3.03(ii)
Series A Preferred Stock....................................  3.05
Significant Agreements......................................  3.15(b)
Software....................................................  3.24(b)
Subsidiary..................................................  8.14(a)
Substitute Option...........................................  1.05(a)
Surviving Corporation.......................................  1.01(a)
Tax/Taxes...................................................  3.21
2000 Annual Meeting.........................................  2.02
Voting Amerin Stock.........................................  3.05
</TABLE>
 
     IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
duly executed by their respective authorized officers as of the day and year
first above written.
 
                                          CMAC INVESTMENT CORPORATION
 
                                          By: /s/ Frank P. Filipps
                                            ------------------------------------
                                              Name: Frank P. Filipps
                                              Title: President and Chief
                                              Executive Officer
 
                                          AMERIN CORPORATION
 
                                          By: /s/ Roy J. Kasmar
                                            ------------------------------------
                                              Name: Roy J. Kasmar
                                              Title: President and Chief
                                              Operating Officer
 
                                      I-45
<PAGE>   139
 
                                                                     APPENDIX II
 
                          SECOND AMENDED AND RESTATED
                          CERTIFICATE OF INCORPORATION
 
                                       OF
 
                               RADIAN GROUP INC.
 
FIRST: Corporate Name. The name of the corporation is Radian Group Inc.
(hereinafter referred to as the "Corporation").
 
SECOND: Registered Office. The registered office of the Corporation is to be
located at Corporation Trust Center, 1209 Orange Street, in the City of
Wilmington, in the County of New Castle, in the State of Delaware. The name of
its registered agent at that address is The Corporation Trust Company.
 
THIRD: Corporate Purpose. The purpose of the Corporation is to engage in any
lawful act or activity for which a corporation may be organized under the
Delaware General Corporation Law.
 
FOURTH: Capital Stock. The Corporation shall be authorized to issue one hundred
million (100,000,000) shares of capital stock, of which eighty million
(80,000,000) shares shall be Common Stock, par value $.001 per share, and twenty
million (20,000,000) shares shall be Preferred Stock, par value $.001 per share.
 
     4.1 Authority of Board to Fix Term of Shares. The Preferred Stock
authorized by this Certificate of Incorporation may be issued from time to time
in one or more series. The Board of Directors of the Corporation shall have the
full authority permitted by law to establish one or more series and the number
of shares constituting each such series and to fix by resolution full, limited,
multiple or fractional, or no voting rights, and such designations, preferences,
qualifications, privileges, limitations, restrictions, options, conversion
rights and other special or relative rights of any series of the Preferred Stock
that may be desired. Subject to the limitation on the total number of shares of
Preferred Stock which the Corporation has authority to issue hereunder, the
Board of Directors is also authorized to increase or decrease the number of
shares of any series, subsequent to the issue of that series, but not below the
number of shares of such series then outstanding. In case the number of shares
of any series shall be so decreased, the shares constituting such decrease shall
resume the status which they had prior to the adoption of the resolution
originally fixing the number of shares of such series.
 
     4.2 $4.125 Preferred Stock. The Corporation is authorized to issue a series
of Preferred Stock, which shall consist of 800,000 shares and is designated as
"$4.125 Preferred Stock." The powers, preferences, rights, restrictions and
other matters relating to the $4.125 Preferred Stock are as follows:
 
          (a) Designation. The designation of such series of the Preferred Stock
     shall be $4.125 Preferred Stock (the "$4.125 Preferred Stock"). The number
     of shares of the $4.125 Preferred Stock shall be 800,000. The number of
     authorized shares of the $4.125 Preferred Stock may be reduced by the Board
     of Directors of the Corporation or a duly authorized committee thereof and
     by the filing of a certificate pursuant to the provisions of the General
     Corporation Law of the State of Delaware stating that such reduction has
     been so authorized. The number of authorized shares of the $4.125 Preferred
     Stock shall not be increased.
 
          (b) Certain Definitions. As used in this Section 4.2, the following
     terms shall have the following respective meanings:
 
     "Affiliate" has the meaning contained in Rule 12b-2 promulgated under the
Exchange Act, or any successor provision thereto.
 
     "Beneficial Owner" has the meaning contained in Rule 13d-3 promulgated
under the Exchange Act, or any successor provision thereto.
<PAGE>   140
 
     "Business Day" means any day except a Saturday, Sunday or any day on which
banking institutions are legally authorized or obligated to close in the
Commonwealth of Pennsylvania or a day on which the New York Stock Exchange is
not open for the regular transaction of business.
 
     "By-laws" means the By-laws of the Corporation, as amended from time to
time.
 
     "CMAC" means Commonwealth Mortgage Assurance Company, a Pennsylvania
corporation, or any successor entity thereto which is the principal subsidiary
of the Corporation engaged in the business of providing private mortgage
insurance.
 
     "Common Shares" means any stock of the Corporation which has no preference
in respect of dividends or of amounts payable in the event of any voluntary or
involuntary liquidation, dissolution or winding-up of the Corporation and which
is not subject to redemption by the Corporation.
 
     "Common Stock" means the common stock, par value $.001 per share, of the
Corporation as of the original date of issuance of shares of the $4.125
Preferred Stock, or shares of the Corporation of any class or classes resulting
from any reclassification or reclassification thereof.
 
     "Exchange Act" means the Securities Exchange Act of 1934, as amended.
 
     "Fundamental Transaction" means any merger, consolidation, sale of assets
or similar transaction on which the holders of Common Stock are entitled to
vote.
 
     "Junior Dividend Shares" means shares of any series or class of the
Corporation which are by their terms expressly made junior to shares of the
$4.125 Preferred Stock at the time outstanding as to dividends.
 
     "Junior Liquidation Shares" means shares of any series or class of the
Corporation which are by their terms expressly made junior to shares of the
$4.125 Preferred Stock at the time outstanding as to the distribution of assets
on any voluntary or involuntary liquidation of the Corporation.
 
     "Parity Dividend Shares" means shares of any series or class of the
Corporation which are by their terms on a parity with shares of the $4.125
Preferred Stock at the time outstanding as to dividends.
 
     "Parity Liquidation Shares" means shares of any series or class of the
Corporation which are by their terms on a parity with shares of the $4.125
Preferred Stock at the time outstanding as to as to the distribution on assets
on any voluntary or involuntary liquidation of the Corporation.
 
     "Person" means any individual, corporation, partnership, association,
joint-stock company, trust, unincorporated organization, or government or
political subdivision thereof.
 
     "Senior Dividend Shares" means shares of any series or class of the
Corporation which are by their terms expressly made senior to shares of the
$4.125 Preferred Stock at the time outstanding as to dividends.
 
     "Senior Liquidation Shares" means shares of any series or class of the
Corporation which are by their terms expressly made senior to shares of the
$4.125 Preferred Stock at the time outstanding as to the distribution of assets
on any voluntary or involuntary liquidation of the Corporation.
 
          (c) Voting Rights. Except as otherwise required by law or as expressly
     provided in this paragraph (c), holders of shares of the $4.125 Preferred
     Stock shall have no voting rights:
 
             (1) Dividend Defaults.
 
             (A) If and whenever accrued dividends on shares of the $4.125
        Preferred Stock or any Parity Dividend Shares shall not have been paid
        in an aggregate amount equal to or greater than six quarterly dividends
        (whether consecutive or not) on shares of the $4.125 Preferred Stock or
        such Parity Dividend Shares at the time outstanding, the number of
        directors then constituting the entire Board of Directors of the
        Corporation shall be increased automatically by two directors and the
        holders of shares of the $4.125 Preferred Stock and the holders of any
        Parity Dividend Shares, voting non-cumulatively and together as a single
        class, shall be entitled to fill such newly-
 
                                      II-2
<PAGE>   141
 
        created directorships at the next annual meeting of stockholders of the
        Corporation or at a special meeting called as hereinafter provided in
        this subparagraph (c)(1)(A). Such right to vote as a single class to
        elect two directors shall, when vested, continue until all dividends in
        default on shares of the $4.125 Preferred Stock and any Parity Dividend
        Shares, as the case may be, shall have been paid in full and, when so
        paid, such right to elect two directors separately as a class shall
        cease, subject to the same provisions for the vesting of such right to
        elect two directors separately as a class in the case of future dividend
        defaults. At any time when such right to elect two directors separately
        as a class shall have so vested, the Corporation may, and, upon the
        written request of the holders of record of not less than 20% of the
        total number of shares of the $4.125 Preferred Stock and any Parity
        Dividend Shares then outstanding, shall call a special meeting of the
        holders of such shares for the election of directors to fill such
        newly-created directorships. In the case of such a written request, such
        special meeting shall be held within 90 days after the receipt of such
        request and, in either case, at the place and upon the notice provided
        by law and in the By-laws, except that the Corporation shall not be
        required to call such a special meeting if such request is received less
        than 120 days before the date fixed for the next ensuing annual meeting
        of stockholders of the Corporation, at which meeting such newly-created
        directorships shall be filled by the holders of shares of the $4.125
        Preferred Stock and any Parity Dividend Shares.
 
             (B) So long as any shares of the $4.125 Preferred Stock are
        outstanding, the By-laws shall contain provisions ensuring that the
        number of directors of the Corporation shall at all times be such that
        the exercise, by the holders of shares of the $4.125 Preferred Stock and
        the holders of Parity Dividend Shares, of the right to elect directors
        under the circumstances provided in subparagraph (c)(1)(A) above will
        not contravene any provisions of the Corporation's Restated Certificate
        or By-laws.
 
             (C) Directors elected pursuant to subparagraph (c)(1)(A) shall not
        be elected to any particular class of the Board of Directors and shall
        serve until the earlier of:
 
                (i) the next annual meeting of the stockholders of the
           Corporation and the election (by the holders of shares of the $4.125
           Preferred Stock and the holders of Parity Dividend Shares) and
           qualification of their respective successors; or
 
                (ii) the date upon which all accumulations of unpaid dividends
           on shares of the $4.125 Preferred Stock and such Parity Dividend
           Shares shall have been paid in full.
 
        If, prior to the end of the term of any director elected pursuant to
        subparagraph (c)(1)(A), a vacancy in the office of such director shall
        occur during the continuance of a default in dividends on the shares of
        the $4.125 Preferred Stock or such Parity Dividend Shares by reason of
        death, resignation, disability or otherwise, such vacancy shall be
        filled for the unexpired term by the appointment by the remaining
        director elected pursuant to subparagraph (c)(1)(A) of a new director
        for the unexpired term of such former director.
 
             (D) Notwithstanding any provision in this paragraph (c) to the
        contrary, so long as Reliance Group Holdings, Inc. or any Affiliate
        thereof is the Beneficial Owner of any shares of the $4.125 Preferred
        Stock, such corporation or Affiliate shall have no voting rights with
        respect to such shares of the $4.125 Preferred Stock in the event of the
        default on payment of dividends by the Corporation and any shares so
        beneficially owned shall not be counted as outstanding and entitled to
        vote for purposes of any vote or other action by the holders of the
        shares of $4.125 Preferred Stock and Parity Dividend Shares pursuant to
        subparagraph (c)(1).
 
             (2) Miscellaneous. So long as any shares of the $4.125 Preferred
        Stock are outstanding, the Corporation shall not, without either the
        affirmative vote of the holders of at least two-thirds of the
        outstanding shares of the $4.125 Preferred Stock voting at a meeting of
        such holders, or the
 
                                      II-3
<PAGE>   142
 
        affirmative written consent of holders of at least two-thirds of the
        outstanding shares of the $4.125 Preferred Stock:
 
                (A) Authorize or issue any Senior Dividend Shares or Senior
           Liquidation Shares.
 
                (B) Consummate any Fundamental Transaction, unless all
           outstanding shares of $4.125 Preferred Stock have been called for
           redemption pursuant to paragraph (f)(2) below and the rights of the
           holders of such shares have ceased in accordance with paragraph
           (f)(3) below.
 
                (C) Subject to the remaining provisions of this subparagraph
           (c)(2)(C), amend the Corporation's Certificate of Incorporation or
           any certificate of designations or take other action so as to affect
           adversely in any material respect the voting powers or other rights,
           privileges, powers or preferences of shares of the $4.125 Preferred
           Stock. No class vote of the $4.125 Preferred Stock shall be required
           for any of the amendments to the Corporation's Certificate of
           Incorporation or any certificate of designations set forth in
           subparagraph (c)(2)(C)(i) below which shall be deemed not to affect
           adversely in any material respect the voting powers or other rights
           and preferences of shares of the 4.125% Preferred Stock:
 
               (i) the authorization or issuance of any shares of any series or
                   class of the Corporation which are neither Senior Dividend
                   Shares nor Senior Liquidation Shares.
 
                (D) Amend that certain Reserve Account Agreement dated August
           14, 1992 by and between the Corporation and Commonwealth Mortgage
           Assurance Company.
 
          (d) Dividends.
 
             (1) Cash Dividends. The cash dividend rate on shares of the $4.125
        Preferred Stock shall be $4.125 per annum per share. Cash dividends on
        shares of the 4.125% Preferred Stock shall be payable quarterly at the
        rate of $1.03125 per share, when, as and if declared by the Board of
        Directors out of funds legally available for the payment of dividends,
        on the fifteenth day of February, May, August and November of each year
        (each, a "Payment Date"), commencing February 15, 1993, except that if
        any such Payment Date is not a Business Day then such dividend shall be
        payable on the first immediately succeeding Business Day. Any cash
        dividend payable on February 15, 1993 on shares of the $4.125 Preferred
        Stock will be computed on the actual number of days from the date of
        issuance of the $4.125 Preferred Stock to February 15, 1993. No interest
        or dividends will be payable in respect of any accumulations of unpaid
        dividends on shares of the $4.125 Preferred Stock. The holders of shares
        of the $4.125 Preferred Stock shall not be entitled to any dividends
        other than the dividends provided in this paragraph (d).
 
             (2) Record Date. Each cash dividend shall be paid to the holders of
        record of shares of the $4.125 Preferred Stock as they appear on the
        stock register of the Corporation on the fifteenth day of the month next
        preceding such Payment Date (each, a "Record Date"). Dividends on
        account of accumulations of unpaid dividends may be declared and paid at
        any time, without reference to any regular dividend Payment Date, to
        holders of record on such date, not exceeding 60 days preceding the
        payment date thereof, as may be fixed by the Board of Directors of the
        Corporation.
 
             (3) Priority of Dividends. If at any time the Corporation has
        failed to pay or declare and set apart for payment accumulations of
        unpaid dividends on any Senior Dividend Shares, the Corporation shall
        not pay any dividend on the $4.125 Preferred Stock. Holders of shares of
        the $4.125 Preferred Stock shall be entitled to receive the dividends
        provided in this paragraph (d) in preference to and in priority over
        dividends upon the Common Shares and all Junior Dividend Shares.
 
                                      II-4
<PAGE>   143
 
             (4) Default; Payment of Pro Rata Dividends. Unless and until (x)
        all accumulations of unpaid dividends on shares of the $4.125 Preferred
        Stock and any Parity Dividend Shares at the time outstanding have been
        paid in full or declared in full and sums set apart for the payment
        thereof and (y) the Corporation has fully complied with all scheduled
        redemption obligations, sinking fund obligations and all other
        redemption obligations relating to the shares of $4.125 Preferred Stock,
        any Parity Dividend Shares and any Parity Liquidation Shares at the time
        outstanding, the payment of dividends on, and redemptions and purchases
        of, shares of the Corporation's capital stock shall be subject to the
        restrictions contained in paragraph (h) below.
 
             Unless and until all accumulations of unpaid dividends on shares of
        the $4.125 Preferred Stock and any Parity Dividend Shares at the time
        outstanding have been paid in full or declared in full and sums set
        apart for the payment thereof, all dividends declared by the Corporation
        upon shares of the $4.125 Preferred Stock and Parity Dividend Shares
        shall be declared pro rata with respect to all shares of the $4.125
        Preferred Stock and Parity Dividend Shares then outstanding, so that the
        amounts of any dividends declared by the Corporation upon each share of
        $4.125 Preferred Stock and each Parity Dividend Share shall in all cases
        bear to each other the same ratio that, at the time of such declaration,
        all accumulations of unpaid dividends on shares of the $4.125 Preferred
        Stock and on such Parity Dividend Shares bear to each other.
 
          (e) Liquidation.
 
             (1) Liquidation Value. The liquidation value of shares of the
        $4.125 Preferred Stock, in case of the voluntary or involuntary
        liquidation, dissolution or winding-up of the Corporation, shall be
        $50.00 per share, plus an amount equal to accumulations of unpaid
        dividends thereon to the payment date.
 
             (2) Priority of Liquidation Distributions. In the event of any
        voluntary or involuntary liquidation, dissolution or winding-up of the
        Corporation, the holders of shares of the $4.125 Preferred Stock shall
        be entitled to receive the liquidation value of such shares held by them
        in preference to and in priority over any distributions upon the Common
        Shares and the Junior Liquidation Shares, but the holders of shares of
        the $4.125 Preferred Stock shall not be entitled to receive any
        distribution in respect of the liquidation value of such shares until
        the Corporation has paid in full the liquidation value to which the
        holders of all Senior Liquidation Shares are entitled. Upon payment in
        full of the liquidation value to which the holders of shares of the
        $4.125 Preferred Stock are entitled, the holders of shares of the $4.125
        Preferred Stock will not be entitled to any further participation in any
        distribution of assets by the Corporation. If the assets of the
        Corporation are not sufficient to pay in full the liquidation value
        payable to the holders of shares of the $4.125 Preferred Stock and the
        liquidation value payable to the holders of the Parity Liquidation
        Shares, the distribution of such assets shall be made pro rata with
        respect to all shares of the $4.125 Preferred Stock and Parity
        Liquidation Shares then outstanding, so that the amounts of any
        distributions paid on each share of $4.125 Preferred Stock and each
        Parity Liquidation Share shall in all cases bear to each other the same
        ratio that, at the time of such distribution, the liquidation values of
        the $4.125 Preferred Stock and the Parity Liquidation Shares bear to
        each other.
 
             (3) Consolidations, Mergers, Etc. Neither a consolidation or merger
        of the Corporation with or into any other corporation, nor a merger of
        any other corporation with or into the Corporation, nor a reorganization
        of the Corporation, nor the purchase or redemption of all or part of the
        outstanding shares of any class or classes of the Corporation, nor the
        sale or transfer of all or any part of the Corporation's assets for cash
        or securities or other property shall be considered a liquidation,
        dissolution or winding-up of the Corporation within the meaning of this
        paragraph (e); provided that, in each case, effective provision is made
        in the certificate of incorporation of the resulting or surviving
        corporation or otherwise for the protection of the rights of the holders
        of the $4.125 Preferred Stock.
 
                                      II-5
<PAGE>   144
 
          (f) Redemptions at the Option of the Corporation.
 
             (1) Permitted Redemptions. Subject to paragraph (f)(2) below,
        shares of the $4.125 Preferred Stock shall not be redeemable by the
        Corporation prior to August 15, 2002. Shares of the $4.125 Preferred
        Stock may be redeemed for cash at the option of the Corporation in whole
        or from time to time in part on or after August 15, 2002 at the
        following redemption prices per share if redeemed during the 12-month
        period beginning August 15 of the year specified below:
 
<TABLE>
<CAPTION>
12-MONTH
PERIOD BEGINNING                                       PRICE
AUGUST 15                                            PER SHARE
- ----------------                                     ---------
<S>                                                  <C>
2002...............................................   $54.125
2003...............................................   $52.750
2004...............................................   $51.375
</TABLE>
 
        and if redeemed at any time thereafter at $50.00 per share, plus, in
        each case, an amount equal to accumulations of unpaid dividends thereon
        to the redemption date.
 
             (2) Redemption in Connection with a Fundamental Transaction. If any
        time prior to August 15, 2002 the holders of the outstanding shares of
        $4.125 Preferred Stock fail to approve a Fundamental Transaction as
        required by paragraph (c)(2)(B) above, such shares may be redeemed in
        full at the option of the Corporation for cash at $50.00 per share, plus
        an amount equal to accumulations of unpaid dividends thereon to the
        redemption date. The Corporation may not exercise the redemption right
        provided in this paragraph (f)(2) unless the Corporation proceeds with
        the Fundamental Transaction which the holders of $4.125 Preferred Stock
        failed to approve.
 
             (3) Notice Procedures. Not less than 30 nor more than 60 days prior
        to the date fixed for any redemption of shares of the $4.125 Preferred
        Stock pursuant to this paragraph (f), a written notice specifying the
        time and place of such redemption, the redemption price and the number
        of shares to be redeemed shall be given by first class mail, postage
        prepaid, to the holders of record of the shares of the $4.125 Preferred
        Stock to be redeemed at their respective addresses as the same shall
        appear on the books of the Corporation, calling upon each such holder of
        record to surrender to the Corporation on the redemption date at the
        place designated in such notice the holder's certificate or certificates
        representing the number of shares specified in such notice of
        redemption. Neither a failure to mail such notice, nor any defect
        therein or in the mailing thereof, to any particular holder shall affect
        the sufficiency of the notice or the validity of the proceedings for
        redemption with respect to the other holders. Any notice that is mailed
        in the manner herein provided shall be conclusively presumed to have
        been duly given whether or not the holder receives the notice. On or
        after the redemption date each holder of shares of the $4.125 Preferred
        Stock to be redeemed shall present and surrender the certificate or
        certificates for such shares to the Corporation at the place designated
        in such notice, and thereupon the redemption price of such shares shall
        be paid to or to the order of the Person whose name appears on such
        certificate or certificates as the owner thereof and each surrendered
        certificate shall be cancelled. In case fewer than all the shares
        represented by any such certificate are redeemed, a new certificate
        shall be issued representing the unredeemed shares.
 
             (4) Cessation of Rights as Stockholder. If a notice of redemption
        has been given pursuant to subparagraph (f)(3) above and if, on or
        before the date fixed for redemption, the funds necessary for such
        redemption shall have been deposited by the Corporation, in trust for
        the pro rata benefit of the holders of the shares so called for
        redemption (so as to be and continue to be available therefor) with a
        bank or trust company doing business in Philadelphia, Pennsylvania and
        having capital, surplus and undivided profits aggregating at least
        $100,000,000, then, notwithstanding that any certificates for such
        shares have not been surrendered for cancellation, on the redemption
        date dividends shall cease to accrue on the shares of the $4.125
        Preferred
 
                                      II-6
<PAGE>   145
 
        Stock to be redeemed, and at the close of business on the redemption
        date the holders of such shares shall cease to be stockholders with
        respect to such shares and shall have no interest in or claims against
        the Corporation by virtue thereof and shall have no voting or other
        rights with respect to such shares (except the right to receive the
        moneys payable upon such redemption, without interest thereon, upon
        surrender, and endorsement if required by the Corporation, of their
        certificates), and the shares evidenced thereby shall not be deemed to
        be outstanding shares for the purpose of voting or determining the total
        number of shares entitled to vote on any matter. Any moneys so deposited
        by the Corporation and unclaimed at the end of two years from the
        redemption date may revert to the general funds of the Corporation, and
        any funds held by any paying agent may be paid to the Corporation upon
        request of the Corporation, after which reversion or payment the holders
        of such shares so called for redemption shall look only to the general
        funds of the Corporation for the payment of the redemption price. Any
        interest accrued on funds so deposited shall be paid to the Corporation
        from time to time.
 
             (5) Partial Redemption Procedures. If fewer than all of the
        outstanding shares of the $4.125 Preferred Stock shall be called for
        redemption pursuant to this paragraph (f)(1) above, the shares to be
        redeemed shall be selected pro rata, as nearly as practicable, or by lot
        or by such other manner as may be prescribed by resolution of the Board
        of Directors of the Corporation and shall be consistent with the
        applicable rules of the National Association of Securities Dealers.
 
          (g) Sinking Fund. Except as otherwise provided in this paragraph (g),
     the shares of the $4.125 Preferred Stock are not subject to mandatory
     redemption requirements.
 
             (1) Mandatory Redemption. So long as any share of $4.125 Preferred
        Stock remains outstanding, on August 15 of each year from 2002 to 2011,
        inclusive, the Corporation shall redeem 72,000 shares, and on August 15,
        2012 shall redeem all shares then outstanding, at a price of $50.00 per
        share plus accrued and unpaid cumulative dividends to date of
        redemption.
 
             On or before each such August 15, the Corporation shall, deposit
        all funds necessary for the redemption of shares of $4.125 Preferred
        Stock as above provided, in trust for the account of the holders of the
        shares to be redeemed, so as to be and continue to be available
        therefor, with a bank or trust company doing business in Philadelphia,
        Pennsylvania, and having capital, surplus and undivided profits
        aggregating at least $10,000,000. The particular shares of $4.125
        Preferred Stock so to be redeemed shall be determined, notice of such
        redemption shall be given and the deposit of funds shall be made by the
        Corporation in the manner and with the effect provided in paragraph (g)
        hereof.
 
             If the Corporation fails to comply with its sinking fund obligation
        as heretofore provided, it shall make good any such deficiency at the
        earliest possible time thereafter. The obligation to redeem shares of
        $4.125 Preferred Stock for the sinking fund as aforesaid shall be
        cumulative if and to the extent not satisfied in any year, whether or
        not there shall be funds legally available therefor, but without
        interest on the amount of any deficiencies.
 
             Against the number of shares required to be redeemed in any year by
        the provisions of this paragraph (g), the Corporation may credit shares
        of $4.125 Preferred Stock which it has purchased or redeemed at any time
        during or prior to such year otherwise than through the operation of the
        sinking fund; provided that any shares so credited shall not theretofore
        have been used for the purpose of such credit.
 
             (2) Notice Procedures. Not less than 30 nor more than 60 days prior
        to any redemption date, a written notice specifying the sinking fund
        deposit made or to be made, the redemption date, the time and place of
        such redemption, the redemption price and the number of shares to be
        redeemed shall be given by first class mail, postage prepaid, to the
        holders of record of shares of the $4.125 Preferred Stock at their
        respective addresses as the same shall appear on the books of the
        Corporation, calling upon each such holder of record to surrender to the
        Corporation on
 
                                      II-7
<PAGE>   146
 
        the redemption date at the place designated in such notice the holder's
        certificate or certificates representing the number of shares specified
        in such notice of redemption. Neither a failure to mail such notice, nor
        any defect therein or in the mailing thereof, to any particular holder
        shall affect the sufficiency of the notice or the validity of the
        proceedings for redemption with respect to the other holders. Any notice
        that is mailed in the manner herein provided shall be conclusively
        presumed to have been duly given whether or not the holder receives the
        notice. On or after the redemption date each holder of shares of the
        $4.125 Preferred Stock to be redeemed shall present and surrender the
        certificate or certificates for such shares to the Corporation at the
        place designated in such notice, and thereupon the redemption price of
        such shares shall be paid to or to the order of the Person whose name
        appears on such certificate or certificates as the owner thereof and
        each surrendered certificate shall be cancelled. In case fewer than all
        the shares represented by any such certificate are redeemed, a new
        certificate shall be issued representing the unredeemed shares.
 
             (3) Cessation of Rights as Stockholder. If a notice of redemption
        has been given pursuant to subparagraph (g)(2) above and if, on or
        before the date fixed for redemption, the funds necessary for such
        redemption shall have been deposited pursuant to subparagraph (g)(1)
        above, then notwithstanding that any certificates for such shares have
        not been surrendered for cancellation, on the redemption date dividends
        shall cease to accrue on the shares of the $4.125 Preferred Stock to be
        redeemed, and at the close of business on the redemption date the
        holders of such shares shall cease to be stockholders with respect to
        such shares and shall have no interest in or claims against the
        Corporation by virtue thereof and shall have no voting or other rights
        with respect to such shares (except the right to receive the moneys
        payable upon such redemption, without interest thereon, upon surrender,
        and endorsement, if required by the Corporation, of their certificates),
        and the shares evidenced thereby shall not be deemed to be outstanding
        shares for the purpose of voting or determining the total number of
        shares entitled to vote on any matter. Any moneys so deposited by the
        Corporation and unclaimed at the end of two years from the redemption
        date may revert to the general funds of the Corporation, and any funds
        held by any paying agent may be paid to the Corporation upon request of
        the Corporation, after which reversion or payment the holders of such
        shares so called for redemption shall look only to the general funds of
        the Corporation for the payment of the redemption price. Any interest
        accrued on funds so deposited shall be paid to the Corporation from time
        to time.
 
             (4) Partial Redemption Procedures. Any shares to be redeemed
        pursuant to this paragraph (g) shall be selected pro rata, as nearly as
        practicable, or by lot as may be prescribed by resolution of the Board
        of Directors of the Corporation and shall be consistent with the
        applicable rules of the National Association of Securities Dealers.
 
             (5) Default. Unless and until (x) all accumulations of unpaid
        dividends on shares of the $4.125 Preferred Stock and any Parity
        Dividend Shares at the time outstanding have been paid in full or
        declared in full and sums set apart for the payment thereof and (y) the
        Corporation has fully complied with all scheduled redemption
        obligations, sinking fund obligations and all other redemption
        obligations relating to the shares of $4.125 Preferred Stock, any Parity
        Dividend Shares and any Parity Liquidation Shares at the time
        outstanding, the payment of dividends on, and redemptions and purchases
        of, shares of the Corporation's capital stock shall be subject to the
        restrictions contained in paragraph (h) below.
 
          (h) Dividend and Redemption Default Provisions. Unless and until (x)
     all accumulations of unpaid dividends on shares of the $4.125 Preferred
     Stock and any Parity Dividend Shares at the time outstanding have been paid
     in full or declared in full and sums set apart for the payment thereof, and
     (y) the Corporation has fully complied with all scheduled redemption
     obligations, sinking fund
 
                                      II-8
<PAGE>   147
 
     obligations and all other redemption obligations relating to the shares of
     $4.125 Preferred Stock, any Parity Dividend Shares and any Parity
     Liquidation Shares at the time outstanding:
 
             (1) No dividends may be declared or paid or set aside for payment
        and no other distribution may be made in respect of any Common Shares,
        Junior Dividend Shares or (except as provided above in subparagraph (d)
        (4)) Parity Dividend Shares, except dividends or other distributions in
        Common Shares or Junior Dividend Shares.
 
             (2) No Common Shares, Junior Dividend Shares or Junior Liquidation
        Shares may be redeemed, purchased or otherwise acquired for any
        consideration (or any payment made to or available for a sinking fund
        for the redemption of any such shares) by the Corporation or any entity
        controlled by the Corporation (except (i) by conversion into or exchange
        for stock of the Corporation ranking junior to shares of the $4.125
        Preferred Stock as to dividend and liquidation rights, (ii) in
        repurchases of Common Shares, Junior Dividend Shares or Junior
        Liquidation Shares from employees or directors of or consultants to the
        Corporation pursuant to contractual arrangements entered into at the
        time such shares were issued giving the Corporation the right to
        repurchase such shares upon the occurrence of certain contingencies and
        (iii) by acquisition of Common Shares, Junior Dividend Shares or Junior
        Liquidation Shares issued in connection with an acquisition pursuant to
        an escrow, pledge or similar arrangement under which the Corporation
        becomes entitled to receive such shares).
 
             (3) No shares of the $4.125 Preferred Stock or any Parity Dividend
        Shares or Parity Liquidation Shares may be redeemed unless all
        outstanding shares of the $4.125 Preferred Stock are redeemed.
 
             (4) No shares of the $4.125 Preferred Stock or any Parity Dividend
        Shares or Parity Liquidation Shares may be purchased or otherwise
        acquired by the Corporation for value except in accordance with a
        purchase or exchange offer made simultaneously by the Corporation to all
        holders of record of shares of the $4.125 Preferred Stock, Parity
        Dividend Shares and Parity Liquidation Shares which, considering the
        annual dividend rates and the other relative rights and preferences of
        such shares, in the opinion of the Board of Directors (whose
        determination shall be conclusive), will result in fair and equitable
        treatment among all such shares.
 
          (i) Status of Redeemed Shares. All shares of the $4.125 Preferred
     Stock which are at any time redeemed pursuant to paragraph (f) or (g) above
     and all shares of the $4.125 Preferred Stock which are otherwise reacquired
     by the Corporation and subsequently cancelled by the Board of Directors
     shall have the status of authorized but unissued shares of Preferred Stock,
     without designation as to series, subject to reissuance by the Board of
     Directors as shares of any one or more other series.
 
     4.3 Series A Preferred Stock. The Corporation is authorized to issue a
series of Preferred Stock, which shall consist of 100,000 shares and is
designated as "Series A Junior Participating Preferred Shares" (the "Series A
Preferred Shares"). The powers, preferences, rights, restrictions and other
matters relating to the Series A Preferred Shares are as follows:
 
          (a) Dividends and Distributions.
 
          (1) The rate of dividends payable per share of Series A Preferred
     Shares on the first day of January, April, July and October in each year or
     such other quarterly payment date as shall be specified by the Board of
     Directors (each such date being referred to herein as a "Quarterly Dividend
     Payment Date"), commencing on the first Quarterly Dividend Payment Date
     after the first issuance of a share or fraction of a share of the Series A
     Preferred Shares, shall be (rounded to the nearest cent) equal to the
     greater of (A) $10.00 or (B) subject to the provision for adjustment
     hereinafter set forth, 1,000 times the aggregate per share amount of all
     cash dividends, and 1,000 times the aggregate per share amount (payable in
     cash, based upon the fair market value at the time the non-cash dividend or
     other distribution is declared or paid as determined in good faith by the
     Board of Directors) of all non-cash dividends or other distributions other
     than a dividend payable in shares of Common Stock or a subdivision of the
     outstanding shares of Common Stock (by reclassification or
 
                                      II-9
<PAGE>   148
 
     otherwise), declared on the Common Stock, $.001 par value per share, of the
     Corporation since the immediately preceding Quarterly Dividend Payment
     Date, or, with respect to the first Quarterly Dividend Payment Date, since
     the first issuance of any share or fraction of a share of the Series A
     Preferred Shares. Dividends on the Series A Preferred Shares shall be paid
     out of funds legally available for such purpose. In the event the
     Corporation shall at any time after April 14, 1998 (the "Rights Declaration
     Date") (A) declare any dividend on Common Stock payable in shares of Common
     Stock, (B) subdivide the outstanding shares of Common Stock, or (C) combine
     the outstanding shares of Common Stock into a smaller number of shares,
     then in each such case the amounts to which holders of Series A Preferred
     Shares were entitled immediately prior to such event under clause (D) of
     the preceding sentence shall be adjusted by multiplying each such amount by
     a fraction the numerator of which is the number of shares of Common Stock
     outstanding immediately after such event and the denominator of which is
     the number of shares of Common Stock that were outstanding immediately
     prior to such event.
 
          (2) Dividends shall begin to accrue and be cumulative on outstanding
     Series A Preferred Shares from the Quarterly Dividend Payment Date next
     preceding the date of issue of such Series A Preferred Shares, unless the
     date of issue of such shares is prior to the record date for the first
     Quarterly Dividend Payment Date, in which case dividends on such shares
     shall begin to accrue from the date of issue of such shares, or unless the
     date of issue is a Quarterly Dividend Payment Date or is a date after the
     record date for the determination of holders of Series A Preferred Shares
     entitled to receive a quarterly dividend and before such Quarterly Dividend
     Payment Date, in either of which events such dividends shall begin to
     accrue and be cumulative from such quarterly Dividend Payment Date. Accrued
     but unpaid dividends shall not bear interest. Dividends paid on the Series
     A Preferred Shares in an amount less than the total amount of such
     dividends at the time accrued and payable on such shares shall be allocated
     pro rata on a share-by-share basis among all such shares at the time
     outstanding.
 
          (b) Voting Rights. In addition to any other voting rights required by
     law, the holders of Series A Preferred Shares shall have the following
     voting rights:
 
             (1) Subject to the provision for adjustment hereinafter set forth,
        each Series A Preferred Share shall entitle the holder thereof to 1,000
        votes on all matters submitted to a vote of the stockholders of the
        Corporation. In the event the Corporation shall at any time after the
        Rights Declaration Date (A) declare any dividend on Common Stock payable
        in shares of Common Stock, (B) subdivide the outstanding shares of
        Common Stock, or (C) combine the outstanding shares of Common Stock into
        a smaller number of shares, then in each such case the number of votes
        per share to which holders of Series A Preferred Shares were entitled
        immediately prior to such event shall be adjusted by multiplying such
        number by a fraction the numerator of which is the number of shares of
        Common Stock outstanding immediately after such event and the
        denominator of which is the number of shares of Common Stock that were
        outstanding immediately prior to such event.
 
             (2) In the event that dividends upon the Series A Preferred Shares
        shall be in arrears to an amount equal to six full quarterly dividends
        thereon, the holders of such Series A Preferred Shares shall become
        entitled to the extent hereinafter provided to vote noncumulatively at
        all elections of directors of the Corporation, and to receive notice of
        all stockholders' meetings to be held for such purpose. At such
        meetings, to the extent that directors are being elected, the holders of
        such Series A Preferred Shares voting as a class shall be entitled
        solely to elect two members of the Board of Directors of the
        Corporation; and all other directors of the Corporation shall be elected
        by the other stockholders of the Corporation entitled to vote in the
        election of directors. Such voting rights of the holders of such Series
        A Preferred Shares shall continue until all accumulated and unpaid
        dividends thereon shall have been paid or funds sufficient therefor set
        aside, whereupon all such voting rights of the holders of shares of such
        series shall cease, subject to being again revived from time to time
        upon the reoccurrence of the conditions above described as giving rise
        thereto.
 
                                      II-10
<PAGE>   149
 
             At any time when such right to elect directors separately as a
        class shall have so vested, the Corporation may, and upon the written
        request of the holders of record of not less than 15% of the then
        outstanding total number of shares of all the Series A Preferred Shares
        having the right to elect directors in such circumstances shall, call a
        special meeting of holders of such Series A Preferred Shares for the
        election of directors. In the case of such a written request, such
        special meeting shall be held within ninety (90) days after the delivery
        of such request, and, in either case, at the place and upon the notice
        provided by law and in the By-laws of the Corporation; provided, that
        the Corporation shall not be required to call such a special meeting if
        such request is received less than one hundred twenty (120) days before
        the date fixed for the next ensuing annual or special meeting of
        stockholders of the Corporation. Upon the mailing of the notice of such
        special meeting to the holders of such Series A Preferred Shares, or, if
        no such meeting be held, then upon the mailing of the notice of the next
        annual or special meeting of stockholders for the election of directors,
        the number of directors of the Corporation shall, ipso facto, be
        increased to the extent, but only to the extent, necessary to provide
        sufficient vacancies to enable the holders of such Series A Preferred
        Shares to elect the two directors hereinabove provided for, and all such
        vacancies shall be filled only by vote of the holders of such Series A
        Preferred Shares as hereinabove provided. Whenever the number of
        directors of the Corporation shall have been increased, the number as so
        increased may thereafter be further increased or decreased in such
        manner as may be permitted by the By-laws and without the vote of the
        holders of Series A Preferred Shares, provided that no such action shall
        impair the right of the holders of Series A Preferred Shares to elect
        and to be represented by two directors as herein provided.
 
             So long as the holders of Series A Preferred Shares are entitled
        hereunder to voting rights, any vacancy in the Board of Directors caused
        by the death or resignation of any director elected by the holders of
        Series A Preferred Shares, shall, until the next meeting of stockholders
        for the election of directors, in each case be filled by the remaining
        director elected by the holders of Series A Preferred Shares having the
        right to elect directors in such circumstances.
 
             Upon termination of the voting rights of the holders of any series
        of Series A Preferred Shares the terms of office of all persons who
        shall have been elected directors of the Corporation by vote of the
        holders of Series A Preferred Shares or by a director elected by such
        holders shall forthwith terminate.
 
             (3) Except as otherwise provided herein, in the Certificate of
        Incorporation of the Corporation or by law, the holders of Series A
        Preferred Shares and the holders of Common Stock (and the holders of
        shares of any other series or class entitled to vote thereon) shall vote
        together as one class on all matters submitted to a vote of stockholders
        of the Corporation.
 
          (c) Reacquired Shares. Any Series A Preferred Shares purchased or
     otherwise acquired by the Corporation in any manner whatsoever shall be
     retired and canceled promptly after the acquisition thereof. All such
     shares shall upon their cancellation become authorized but unissued Series
     Preferred Stock and may be reissued as part of a new series of Series
     Preferred Stock to be created by resolution or resolutions of the Board of
     Directors.
 
          (d) Liquidation, Dissolution or Winding Up. In the event of any
     voluntary or involuntary liquidation, dissolution or winding up of the
     Corporation, the holders of Series A Preferred Shares shall be entitled to
     receive the greater of (1) $100.00 per share, plus accrued dividends to the
     date of distribution, whether or not earned or declared, or (2) an amount
     per share, subject to the provision for adjustment hereinafter set forth,
     equal to 1,000 times the aggregate amount to be distributed per share to
     holders of Common Stock. In the event the Corporation shall at any time
     after the Rights Declaration Date (A) declare any dividend on Common Stock
     payable in shares of Common Stock, (B) subdivide the outstanding shares of
     Common Stock, or (C) combine the outstanding shares of Common Stock into a
     smaller number of shares, then in each such case the amount to which
     holders of Series A Preferred Shares were entitled immediately prior to
     such event pursuant to clause (2) of the preceding sentence shall be
     adjusted by multiplying such amount by a fraction the numerator of
 
                                      II-11
<PAGE>   150
 
     which is the number of shares of Common Stock outstanding immediately after
     such event and the denominator of which is the number of shares of Common
     Stock that were outstanding immediately prior to such event.
 
          (e) Consolidation, Merger, etc. In case the Corporation shall enter
     into any consolidation, merger, combination or other transaction in which
     the shares of Common Stock are exchanged for or changed into other stock or
     securities, cash and/or any other property, then in any such case the
     Series A Preferred Shares shall at the same time be similarly exchanged or
     changed in an amount per share (subject to the provision for adjustment
     hereinafter set forth) equal to 1,000 times the aggregate amount of stock,
     securities, cash and/or any other property (payable in kind), as the case
     may be, into which or for which each share of Common Stock is changed or
     exchanged. In the event the Corporation shall at any time after the Rights
     Declaration Date (1) declare any dividend on Common Stock payable in shares
     of Common Stock, (2) subdivide the outstanding shares of Common Stock, or
     (3) combine the outstanding shares of Common Stock into a smaller number of
     shares, then in each such case the amount set forth in the preceding
     sentence with respect to the exchange or change of shares of Series A
     Preferred Shares shall be adjusted by multiplying such amount by a fraction
     the numerator of which is the number of shares of Common Stock outstanding
     immediately after such event and the denominator of which is the number of
     shares of Common Stock that were outstanding immediately prior to such
     event.
 
          (f) No Redemption. The Series A Preferred Shares shall not be
     redeemable.
 
          (g) Ranking. The Series A Preferred Shares shall rank junior to all
     other series of the Corporation's Series Preferred Stock as to the payment
     of dividends and the distribution of assets, unless the terms of any such
     series shall provide otherwise.
 
          (h) Fractional Shares. Series A Preferred Shares may be issued in
     fractions of a share which shall entitle the holder, in proportion to such
     holder's fractional shares, to exercise voting rights, receive dividends,
     participate in distributions and to have the benefit of all other rights of
     holders of Series A Preferred Shares.
 
FIFTH: Board of Directors.
 
     5.1 Number; Classification. The Board of Directors of the Corporation shall
consist of such number of directors, which number shall not be less than 9 or
more than 14, as shall be fixed from time to time by resolution of the Board.
The Board of Directors shall be divided into three classes, which shall be as
nearly equal in number as possible. Directors of each class shall serve for a
term of three years and until their successors shall have been elected and
qualified. The three initial classes of directors shall be comprised as follows:
 
          (a) Class I shall be comprised of directors who shall serve until the
     annual meeting of stockholders in 1993 and until their successors shall
     have been elected and qualified.
 
          (b) Class II shall be comprised of directors who shall serve until the
     annual meeting of stockholders in 1994 and until their successors shall
     have been elected and qualified.
 
          (c) Class III shall be comprised of directors who shall serve until
     the annual meeting of stockholders in 1995 and until their successors shall
     have been elected and qualified.
 
     5.2 Qualifications. No person shall be appointed or elected a director of
the Corporation unless:
 
          (a) such person is elected to fill a vacancy in the Board of Directors
     (including any vacancy resulting from any increase in the authorized number
     of directors) by a vote of the majority of the Board of Directors then in
     office, and any director so elected shall hold office until the next
     election of the class for which such director shall have been elected and
     until a successor shall have been elected and qualified; or
 
          (b) the name of such person, together with such consents and
     information concerning present and prior occupations, transactions with the
     Corporation or its subsidiaries and other matters as may
 
                                      II-12
<PAGE>   151
 
     at the time be required by or pursuant to the By-laws, shall have been
     filed with the Secretary of the Corporation no later than a time fixed by
     or pursuant to the By-laws immediately preceding the annual or special
     meeting at which such person intends to be a candidate for director.
 
     5.3 Removal of Directors. Directors of the Corporation may only be removed
for cause by a vote of the holders of shares entitled to cast a majority of the
votes which all stockholders are entitled to cast at an election of directors.
No decrease or increase in the size of the Board of Directors shall shorten or
otherwise affect the term of any incumbent director.
 
     5.4 Elections of Directors. Elections of directors need not be by written
ballot unless the By-laws of the Corporation shall so provide.
 
SIXTH: Unanimous Consent of Stockholders in Lieu of Meeting. Any action required
to be taken at any annual or special meeting of stockholders of the Corporation,
or any action which may be taken at any annual or special meeting of such
stockholders, may be taken without a meeting, without prior notice and without a
vote, if a consent or consents in writing, setting forth the action so taken,
shall be signed by the holders of all of the outstanding stock entitled to vote
to take such action at any annual or special meeting of stockholders of the
Corporation and shall be delivered to the Corporation by delivery to its
registered office in Delaware, its principal place of business, or an officer or
agent of the Corporation having custody of the books in which proceedings of
meetings of stockholders are recorded. Every written consent shall bear the date
of signature of each stockholder who signs the consent and no written consent
shall be effective to take the corporate action referred to therein unless,
within 60 days of the earliest dated consent delivered in the manner required in
this section to the Corporation, written consents signed by the holders of all
of the outstanding stock entitled to vote to take such action are delivered to
the Corporation by delivery to its registered office in Delaware, its principal
place of business, or an officer or agent of the Corporation having custody of
the book in which proceedings of meetings of stockholders are recorded. Delivery
made to the Corporation's registered office shall be by hand or by certified or
registered mail, return receipt requested.
 
SEVENTH: By-laws. The Board of Directors shall have the power, in addition to
the stockholders, to make, alter, or repeal the By-laws of the Corporation.
 
EIGHTH: Liability of Directors. A director of the Corporation shall not be
personally liable to the Corporation or its stockholders for monetary damages
for breach of fiduciary duty as a director, except for liability (i) for any
breach of the director's duty of loyalty to the Corporation or its stockholders,
(ii) for acts or omissions not in good faith or which involve intentional
misconduct or a knowing violation of law, (iii) under Section 174 of the
Delaware General Corporation Law, as the same exists or hereafter may be
amended, or (iv) for any transaction from which the director derived an improper
personal benefit. If the Delaware General Corporation Law is hereafter amended
to authorize corporate action further limiting or eliminating the personal
liability of directors, then the liability of a director to the corporation
shall be limited or eliminated to the fullest extent permitted by the Delaware
General Corporation Law, as so amended from time to time. Any repeal or
modification of this Article EIGHTH shall be prospective only, and shall not
adversely affect any limitation on the personal liability of a director of the
Corporation existing at the time of such repeal or modification.
 
NINTH: Indemnification. The Corporation shall, to the fullest extent permitted
by the Delaware General Corporation Law, as the same may be amended and
supplemented, indemnify any and all past, present and future directors and
officers of the Corporation from and against any and all costs, expenses
(including attorneys' fees), damages, judgments, penalties, fines, punitive
damages, excise taxes assessed with respect to an employee benefit plan and
amounts paid in settlement in connection with any action, suit or proceeding,
whether by or in the right of the Corporation, a class of its security holders
or otherwise, in which the director or officer may be involved as a party of
otherwise, by reason of the fact that such person was serving as a director,
officer, employee or agent of the Corporation.
 
                                      II-13
<PAGE>   152
 
TENTH. Fundamental Transactions.
 
     10.1 Stockholder Authorization of Fundamental Transactions Recommended by
Management. Whenever any corporate action which constitutes a Fundamental
Transaction is to be taken by vote of the stockholders and such Fundamental
Transaction has been approved by at least two-thirds of the entire Board of
Directors, the proposed Fundamental Transaction shall be authorized upon
receiving the minimum vote required for the authorization of such action by
statute, after taking into account the express terms of any class or any series
of any class of shares of the Corporation with respect to such vote.
 
     10.2 Stockholder Authorization of Fundamental Transactions Not Recommended
by Management. Except as provided in Section (1) of this Article TENTH, whenever
any corporate action that constitutes a Fundamental Transaction is to be taken
by vote of the stockholders, the proposed Fundamental Transaction shall be
authorized only upon receiving at least two-thirds of the vote which all voting
stockholders, voting as a single class, are entitled to cast thereon and, in
addition, the affirmative vote of the number or proportion of shares of any
class or any series of any class of shares of the Corporation, if any, as shall
at the time be required by statute or the express terms of any such class or
series of any class of shares of the Corporation.
 
     10.3 Fundamental Transaction Defined. For the purposes of this Article
TENTH, the term "Fundamental Transaction" shall mean:
 
          (a) any of the following, if such action is effected by vote of the
     stockholders: amendment of this Certificate of Incorporation; adoption,
     amendment or repeal of the By-laws; a change in the number of directors
     constituting the entire Board of Directors; or removal of one or more
     directors; or
 
          (b) any of the following, if any such transaction requires the
     approval of the Stockholders under this Certificate of Incorporation of the
     Corporation as then in effect or the Delaware General Corporation Law as
     then in effect with respect to the Corporation: the sale, lease, exchange
     or other disposition of all or substantially all of the assets of the
     Corporation; or the merger, consolidation, division, reorganization,
     recapitalization, dissolution, liquidation, or winding up of the
     Corporation.
 
ELEVENTH: Amendments. The Corporation reserves the right to amend, alter, change
or repeal any provision contained in this Certificate of Incorporation, in the
manner now or hereafter prescribed by statute, and all rights conferred upon
stockholders are granted subject to this reservation.
 
                                      II-14
<PAGE>   153
                                                                    APPENDIX III

                           [SCHRODERS & CO. INC. LOGO]

                                                               November 22, 1998

Board of Directors
CMAC Investment Corporation
1601 Market Street
Philadelphia, PA 19103

Ladies and Gentlemen:

         You have requested our opinion as to the fairness to CMAC Investment
Corporation ("CMAC"), from a financial point of view, of the exchange ratio to
be applied in connection with the proposed merger (the "Merger") of CMAC and
Amerin Corporation ("Amerin") pursuant to the terms of the draft Agreement and
Plan of Merger dated as of November 19, 1998 (the "Agreement") between CMAC and
Amerin. It is our understanding that pursuant to the terms of the Agreement,
Amerin will be merged with and into CMAC, and CMAC will continue as the
surviving corporation. Each outstanding share of common stock, par value 0.001
per share, of CMAC (together with associated preferred share purchase rights,
the "Common Stock") will remain outstanding. Each outstanding share of Amerin
common stock, par value $0.01 per share (together with associated preferred
share purchase rights ), will be converted into the right to receive 0.5333
shares of Common Stock (the "Exchange Ratio"). As set forth in the Agreement,
the Exchange Ratio will be fixed and not subject to adjustment. The terms and
conditions of the Merger are more fully set forth in the Agreement and we have
assumed for purposes of this opinion that no such terms or conditions will be
amended, modified or waived prior to consummation of the Merger. You have not
asked us to express, and we are not expressing, any opinion with respect to any
of the other terms, conditions, determinations or actions with respect to the
Merger.

                  In arriving at our opinion, we have, among other things:

         1.       Reviewed certain publicly available business and financial
                  information relating to CMAC and Amerin that we deemed
                  relevant;

         2.       Reviewed certain information, including financial forecasts,
                  provided to us by CMAC and Amerin, respectively;


                                     III-1
<PAGE>   154

Board of Directors
CMAC Investments Corporation
Page 2

         3.       Conducted discussions with members of senior management and
                  representatives of CMAC and Amerin to discuss the business and
                  prospects of CMAC and Amerin, both before and after giving
                  effect to the Merger;

         4.       Reviewed the financial terms of certain other business
                  combinations which have recently been effected that we deemed
                  relevant and compared those terms to the financial terms of
                  the Merger;

         5.       Reviewed the historical stock trading of both CMAC and Amerin
                  and compared such data to the Exchange Ratio;

         6.       Reviewed the trading multiples for publicly held companies
                  similar to CMAC and Amerin and compared such trading multiples
                  to those of CMAC and Amerin;

         7.       Reviewed the potential pro forma impact of the Merger on the
                  earnings, balance sheet and certain financial ratios of CMAC;

         8.       Reviewed the relative contributions of CMAC and Amerin to the
                  pro forma combined company, including the earnings
                  contribution of CMAC and Amerin to the earnings of the pro
                  forma combined company;

         9.       Reviewed a draft dated November 19, 1998 of the Agreement; and

         10.      Reviewed such other information, financial studies, analyses
                  and investigations and financial, economic and market criteria
                  which we deemed relevant, including our assessment of general
                  economic, market and monetary conditions.

         In connection with our review, we have assumed and relied on the
accuracy and completeness of all information supplied or otherwise made
available to us, discussed with or reviewed by or for us, or publicly available,
and we have not assumed any responsibility for independently verifying such
information. With respect to financial forecasts, including estimates of cost
savings and projections of CMAC and Amerin on a combined basis, we have assumed
(and have not independently verified) that they have been reasonably prepared in
accordance with accepted industry practice and reflect the best currently
available estimates and judgments of CMAC's and Amerin's respective managements
and representatives as to expected future financial performance of CMAC or
Amerin, as the case may be, and the estimated cost savings expected to result
from the Merger. We have not made an independent evaluation or appraisal of the
assets or liabilities of CMAC or Amerin, nor have we been furnished with any
such evaluations or appraisals. Although certain of our representatives visited
certain properties of CMAC, we have not conducted any physical inspection of the
properties or facilities of CMAC or Amerin. We have assumed, with your consent,
that: (i) the Merger will be accounted for under the pooling-of-interests method
of accounting; (ii) the


                                     III-2
<PAGE>   155

Board of Directors
CMAC Investments Corporation
Page 3

Merger will be a tax-free reorganization as set forth in the Agreement; (iii)
any material liabilities (contingent or otherwise, known or unknown) of CMAC and
Amerin are as set forth in the consolidated financial statements of CMAC and
Amerin, respectively; and (iv) in the course of obtaining the necessary
regulatory and other consents and approvals (contractual or otherwise) for the
Merger, no restrictions, including any divestiture requirements or amendments or
modifications, will be imposed that will have a material adverse effect on the
contemplated benefits of the Merger. We have also assumed that the final form of
the Agreement will be substantially similar to the last draft reviewed by us.

         Our opinion is necessarily based on market, economic and other
conditions as they exist and can be evaluated on, and the information made
available to us as of, the date hereof. It should be understood that, although
subsequent developments may affect this opinion, we do not have any obligation
to update, revise or reaffirm this opinion. Our opinion is directed to the Board
of Directors of CMAC and does not constitute a recommendation to any shareholder
as to how such shareholder should vote on the Merger. Our opinion does not
address the underlying business decision of CMAC to enter into the Merger. We
are expressing no opinion as to what the value of the Common Stock will actually
be when issued pursuant to the Merger or the prices at which the Common Stock
will actually trade at any time.

         It is understood that this letter is for the information of the Board
of Directors of CMAC only and is not to be quoted or referred to, in whole or in
part, in any registration statement, prospectus, or proxy statement, or in any
other written document used in connection with the offering and sale of
securities nor shall this letter be used for any other purposes, without
Schroder & Co. Inc.'s prior written consent; provided, however, that this letter
may be reproduced in full in a proxy statement/prospectus relating to the
Merger. The opinion expressed herein is not intended to confer rights or
remedies upon CMAC, any stockholder of CMAC or any other person.

         Schroder & Co. Inc. as part of its investment banking business, is
continually engaged in the valuation of businesses and their securities in
connection with mergers and acquisitions, negotiated underwritings, competitive
biddings, secondary distributions of listed and unlisted securities, private
placements and valuations for estate, corporate and other purposes and a broad
range of financial advisory services. We have acted as financial advisor to the
Board of Directors of CMAC in connection with the Merger and will receive a fee
for our services, a significant portion of which is contingent on the
consummation of the Merger. In addition, CMAC has agreed to indemnify us for
certain liabilities arising out of our engagement. Schroder & Co. Inc. has
performed investment banking and other services for CMAC in the past and has
received customary compensation for such services.

         In the ordinary course of our business, we may actively trade the
securities of CMAC and Amerin for our own account and for the accounts of our
customers and, accordingly, may at any time hold long or short positions in such
securities.


                                      III-3
<PAGE>   156

Board of Directors
CMAC Investments Corporation
Page 4

         Based upon the foregoing and subject to the various assumptions set
forth herein, it is our opinion that, as of the date hereof, the Exchange Ratio
is fair from a financial point of view to CMAC.

                                                         Very truly yours,

                                                         /s/ SCHRODER & CO. INC.

                                                         SCHRODER & CO. INC.


                                      III-4
<PAGE>   157
                                                                     APPENDIX IV

                          DONALDSON, LUFKIN & JENRETTE
                       Donaldson, Lufkin & Jenrette, Inc.
            277 Park Avenue, New York, New York 10172- (212)892- 3000

November 22, 1998

Board of Directors
Amerin Corporation
200 East Randolph Drive
Chicago, IL 60601

Dear Sirs:

You have requested our opinion as to the fairness from a financial point of view
to the stockholders of Amerin Corporation (the "Company") of the Exchange Ratio
(as herein defined) set forth in the Agreement and Plan of Merger, dated as of
November 22, 1998 (the "Agreement"), by and between the Company and CMAC
Investment Corporation ("CMAC"), pursuant to which the Company will be merged
(the "Merger") with and into CMAC.

Pursuant to the Agreement, each share of common stock, par value $0.01 per
share, of the Company ("Company Common Stock") will be converted, subject to
certain exceptions, into the right to receive 0.5333 shares (the "Exchange
Ratio") of common stock, par value $0.001 per share, of CMAC ("CMAC Common
Stock").

In arriving at our opinion, we have reviewed the Agreement. We also have
reviewed financial and other information that was publicly available or
furnished to us by the Company and CMAC, including information provided during
discussions with their respective managements. Included in the information
provided during discussions with the respective managements were certain
financial projections of the Company for the five years ended December 31, 2002
prepared by the management of the Company and certain financial projections of
CMAC for the three years ended December 31, 2000 prepared by the management of
CMAC. In addition, we have compared certain financial and securities data of the
Company and CMAC with various other companies whose securities are traded in
public markets, reviewed the historical stock prices and trading volumes of
Company Common Stock and CMAC Common Stock, and conducted such other financial
studies, analyses and investigations as we deemed appropriate for purposes of
this opinion.

In rendering our opinion, we have relied upon and assumed the accuracy and
completeness of all of the financial and other information that was available to
us from public sources, that was provided to us by the Company and CMAC or their
respective representatives, or that was otherwise reviewed by us. In particular,
we have relied upon the estimates of the managements of the Company and CMAC of
the operating synergies achievable as a result of the Merger. With respect to
the financial projections supplied to us, we have assumed that they have been
reasonably prepared on the basis reflecting the best currently available
estimates and judgments of the managements of the Company and CMAC as to the
future operating and financial performance of the Company and CMAC,
respectively. We have not


                                      IV-1
<PAGE>   158

Board of Directors
Amerin Corporation

assumed any responsibility for making an independent evaluation of any assets or
liabilities or for making any independent verification of any of the information
reviewed by us. We have assumed that the Merger will qualify as a pooling of
interests transaction under generally accepted accounting principles. We have
relied as to certain legal matters on advice of counsel to the Company.

Our opinion is necessarily based on economic, market, financial and other
conditions as they exist on, and on the information made available to us as of,
the date of this letter. It should be understood that, although subsequent
developments may affect this opinion, we do not have any obligation to update,
revise or reaffirm this opinion. We are expressing no opinion herein as to the
prices at which Company Common Stock or CMAC Common Stock will actually trade at
any time. Our opinion does not address the relative merits of the Merger and the
other business strategies being considered by the Company's Board of Directors,
nor does it address the Board's decision to proceed with the Merger. Our opinion
does not constitute a recommendation to any stockholder as to how such
stockholder should vote on the proposed Merger.

Donaldson, Lufkin & Jenrette Securities Corporation ("DLJ"), as part of its
investment banking services, is regularly engaged in the valuation of businesses
and securities in connection with mergers, acquisitions, underwritings, sales
and distributions of listed and unlisted securities, private placements and
valuations for corporate and other purposes. In the ordinary course of our
business, DLJ or its affiliates may at any time hold long or short positions,
and may trade or otherwise effect transactions, for our own account or for the
accounts of customers, in equity or debt securities of the Company or CMAC. DLJ
co-managed the Company's initial public offering of common stock in November
1995 and its follow-on common stock offering in February 1997, and received
usual and customary compensation for its services.

Based upon the foregoing and such other factors as we deem relevant, we are of
the opinion that the Exchange Ratio is fair from a financial point of view to
the holders of Company Common Stock.

                                                    Very truly yours,

                                                    DONALDSON, LUFKIN & JENRETTE
                                                    SECURITIES CORPORATION

                                                    By: /s/ David M. Platter
                                                    David M. Platter
                                                    Managing Director


                                      IV-2
<PAGE>   159
 
                                                                      APPENDIX V
 
                            AMENDMENT 1999-1 TO THE
                          CMAC INVESTMENT CORPORATION
                            EQUITY COMPENSATION PLAN
 
Pursuant to Section 12 of the CMAC Investment Corporation Equity Compensation
Plan (the "Plan"), the Plan is hereby amended as follows:
 
     1. The first two sentences of Section 3(a) of the Plan are amended to read,
in their entirety, as follows:
 
     "The aggregate number of shares of the Common Stock, par value $0.001
     ("Common Stock"), of the Company that may be issued or transferred under
     the Plan is 3,200,000, subject to adjustment pursuant to Section 3(b)
     below. The maximum number of shares of Common Stock for which any Grantee
     may be granted options under the Plan is limited to 150,000 for any
     calendar year, subject to adjustment pursuant to Section 3(b) below."
 
                                          By:
                                            ------------------------------------
                                              Name:
                                              Title:
 
                                       V-1
<PAGE>   160
 
                                    PART II
 
                     INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 20.  INDEMNIFICATION OF DIRECTORS AND OFFICERS
 
     Section 102(b)(7) of the Delaware General Corporation Law (the "DGCL")
permits a corporation, in its certificate of incorporation, to limit or
eliminate, subject to certain statutory limitations, the liability of directors
to the corporation or its stockholders for monetary damages for breaches of
fiduciary duty, except for liability (a) for any breach of the director's duty
of loyalty to the corporation or its stockholders, (b) for acts or omissions not
in good faith or which involve intentional misconduct or a knowing violation of
law, (c) under Section 174 of the DGCL, or (d) for any transaction from which
the director derived an improper personal benefit. Article Eighth of the
Registrant's Restated Certificate of Incorporation provides that the personal
liability of directors of the Registrant is eliminated to the fullest extent
permitted by Section 102(b)(7) of the DGCL.
 
     Under Section 145 of the DGCL, a corporation has the power to indemnify
directors and officers under certain prescribed circumstances and subject to
certain limitations against certain costs and expenses, including attorneys'
fees actually and reasonably incurred in connection with any action, suit or
proceeding, whether civil, criminal, administrative or investigative, to which
any of them is a party by reason of being a director or officer of the
corporation if it is determined that the director or officer acted in accordance
with the applicable standard of conduct set forth in such statutory provision.
Article Seventh of the Registrant's Amended and Restated Bylaws provides that
the Registrant will indemnify any person who was or is a party or is threatened
to be made a party to any threatened, pending or completed action, suit or
proceeding by reason of the fact that he is or was a director, officer or other
authorized representative of the Registrant, or is or was serving at the request
of the Registrant as a director, officer, employee or agent of another entity,
against certain liabilities, costs and expenses. Article Seventh further permits
the Registrant to maintain insurance on behalf of any person who is or was a
director, officer, employee or agent of the Registrant, or is or was serving at
the request of the Registrant as a director, officer, employee or agent of
another entity, against any liability asserted against such person and incurred
by such person in any such capacity or arising out of his status as such,
whether or not the Registrant would have the power to indemnify such person
against such liability under the DGCL.
 
     Pursuant to Section 5.04 of the Merger Agreement, the Registrant has agreed
for a period of six years following the effective time to provide liability
insurance, no less favorable in coverage and amount than any insurance in effect
immediately prior to the effective time to each individual who served as a
director or officer of Amerin at any time prior to the effective time, subject
to certain limitations.
 
ITEM 21.  EXHIBITS AND FINANCIAL STATEMENT SCHEDULES
 
     (a) Exhibits:
 
<TABLE>
<CAPTION>
EXHIBIT
NUMBER                            DESCRIPTION
- -------                           -----------
<S>       <C>
2.1       Agreement and Plan of Merger dated as of November 22, 1998,
          between the Registrant and Amerin Corporation.*
3.1       Form of Second Amended and Restated Certificate of
          Incorporation.*
3.2       Form of Bylaws.**
4.1       Specimen certificate for $4.125 Preferred Stock of the
          Registrant. (1)(Exhibit 4.3)
4.2       Certificate of Designations relating to $4.125 Preferred
          Stock of the Registrant. (2)(Exhibit 4.2)
4.3       Standstill and Voting Agreement dated October 27, 1992
          between the Registrant and Reliance Group Holdings, Inc.
          (2)(Exhibit 4.4)
4.4       Amended and Restated Rights Agreement.**
</TABLE>
 
                                      II-1
<PAGE>   161
 
<TABLE>
<CAPTION>
EXHIBIT
NUMBER                            DESCRIPTION
- -------                           -----------
<S>       <C>
5.1       Opinion of Morgan, Lewis & Bockius LLP regarding legality of
          the shares of common stock being registered.**
8.1       Opinion of Morgan, Lewis & Bockius LLP regarding certain tax
          matters.**
8.2       Opinion of Davis Polk & Wardwell regarding certain tax
          matters.**
10.1      Tax Indemnification Agreement dated October 28, 1992, among
          the Registrant, Commonwealth Land Title Insurance Company,
          Reliance Insurance Company and Reliance Group Holdings, Inc.
          (2)(Exhibit 10.3)
10.2      Tax Allocation Agreement dated as of April 1, 1992, among
          Reliance Insurance Company and certain of its subsidiaries,
          including Commonwealth Mortgage Assurance Company.
          (1)(Exhibit 10.4)
10.3      Form of Change of Control Agreement dated January 25, 1995,
          between the Registrant and each of Frank P. Filipps, Douglas
          J. MacLeod, Paul F. Fischer and C. Robert Quint.
          (5)(11)(Exhibit 10.6)
10.4      Change of Control Agreements dated October 30, 1997, between
          the Registrant and both Howard S. Yaruss and William
          Carroll. (8)(11)(Exhibit 10.7)
10.5      Change of Control Agreement dated February 6, 1998, between
          the Registrant and Scott Stevens.(11)(12)(Exhibit 10.5)
10.6      CMAC Investment Corporation Pension Plan. (2)(11)(Exhibit
          10.8)
10.7      CMAC Investment Corporation Savings Incentive Plan, as
          amended and restated through January 1, 1994.
          (5)(11)(Exhibit 10.9)
10.8      CMAC Investment Corporation 1992 Stock Option Plan, as
          amended as of January 1, 1995. (5)(11)(Exhibit 10.10)
10.9      CMAC Investment Corporation Equity Compensation Plan, as
          amended and restated through April 13, 1999.
          (11)(12)(Exhibit 10.9)
10.10     Purchase Agreement dated October 29, 1992 between the
          Registrant and Commonwealth Land Title Insurance Company
          regarding $4.125 Preferred Stock. (2)(Exhibit 10.14)
10.11     Registration Rights Agreement dated October 27, 1992,
          between the Registrant and Commonwealth Land Title Insurance
          Company. (2)(Exhibit 10.15)
10.12     Form of Commonwealth Mortgage Assurance Company Master
          Policy. (1)(Exhibit 10.16)
10.13     Risk-to-Capital Ratio Maintenance Agreement between the
          Registrant and Commonwealth Mortgage Assurance Company
          regarding matters relating to Moody's financial strength
          rating, as amended through October 22, 1993. (3)(Exhibit
          10.15)
10.14     Reserve Account Agreement dated August 14, 1992, between the
          Registrant and Commonwealth Mortgage Assurance Company
          regarding $4.125 Preferred Stock. (1)(Exhibit 10.18)
10.15     First Layer Binder of Reinsurance, effective March 1, 1992,
          among Commonwealth Mortgage Assurance Company, Commonwealth
          Mortgage Assurance Company of Arizona, AXA Reinsurance SA.
          (1)(Exhibit 10.19)
10.16     Capital Mortgage Reinsurance Company Variable Quota Share
          Reinsurance Agreement, effective January 1, 1994, between
          Commonwealth Mortgage Assurance Company and its affiliates
          and Capital Mortgage Reinsurance Company. (4)(Exhibit 10.19)
10.17     Capital Reinsurance Company Reinsurance Agreement, effective
          January 1, 1994, between Commonwealth Mortgage Assurance
          Company and Capital Reinsurance Company. (4)(Exhibit 10.20)
10.18     Capital Mortgage Reinsurance Company Variable Quota Share
          Reinsurance Agreement, effective January 1, 1995 between
          Commonwealth Mortgage Assurance Company and its affiliates
          and Capital Mortgage Reinsurance Company. (5)(Exhibit 10.20)
10.19     Capital Mortgage Reinsurance Company Variable Quota Share
          Reinsurance Agreement, effective January 1, 1996, between
          Commonwealth Mortgage Assurance Company and its affiliates
          and Capital Mortgage Reinsurance Company. (6)(Exhibit 10.21)
10.20     Capital Mortgage Reinsurance Company Variable Quota Share
          Reinsurance Agreement, effective January 1, 1997, between
          Commonwealth Mortgage Assurance Company and its affiliates
          and Capital Mortgage Reinsurance Company.(12)(Exhibit 10.20)
10.21     Amended form of Commonwealth Mortgage Assurance Company
          Master Policy, effective June 1, 1995. (4)(Exhibit 10.22)
</TABLE>
 
                                      II-2
<PAGE>   162
 
<TABLE>
<CAPTION>
EXHIBIT
NUMBER                            DESCRIPTION
- -------                           -----------
<S>       <C>
10.22     CMAC Investment Corporation 1997 Employee Stock Purchase
          Plan. (7)(Exhibit 10)
10.23     Form of Second Amended and Restated Employment Agreement
          dated as of November 1, 1995, between Amerin Guaranty
          Corporation and Gerald L. Friedman. (9)(11)(Exhibit 10.1)
10.24     Form of Second Amended and Restated Employment Agreement
          dated as of November 1, 1995, between Amerin Guaranty
          Corporation and Stuart M. Brafman. (9)(11)(Exhibit 10.1)
10.25     Amended and Restated 1992 Long-Term Incentive Plan dated as
          of November 1, 1995. (9)(11)(Exhibit 10.2)
10.26     Support Agreement (Moody's Investors Service, Inc.) dated as
          of August 26, 1992, among Amerin Corporation (as successor
          in interest to USMIC Corporation), Amerin Guaranty
          Corporation (as successor in interest to Merit Mortgage
          Assurance Corporation) and Security Pacific National Trust
          Company. (9)(Exhibit 10.5)
10.27     Support Agreement (Second) dated as of August 26, 1992,
          among Amerin Corporation (as successor in interest to USMIC
          Corporation), Amerin Guaranty Corporation (as successor in
          interest to Merit Mortgage Assurance Corporation) and
          Security Pacific National Trust Company. (9)(Exhibit 10.6)
10.28     Office Lease dated April 13, 1995, by and between Amoco
          Properties Incorporated and Amerin Guaranty Corporation.
          (9)(11)(Exhibit 10.7)
10.29     Severance Agreement dated as of September 17, 1997, between
          Amerin Corporation and Gerald L. Friedman. (10)(11)(Exhibit
          10.8)
10.30     Severance Agreement dated as of September 17, 1997, between
          Amerin Corporation and Roy J. Kasmar. (10)(11)(Exhibit 10.9)
10.31     Severance Agreement dated as of September 17, 1997, between
          Amerin Corporation and Jerome J. Selitto. (10)(11)(Exhibit
          10.10)
10.32     Release and Separation Agreement dated as of March 1, 1998,
          between Amerin Guaranty Corporation and John F. Peterson.
          (10)(11)(Exhibit 10.11)
10.33     Amendment No. 1 to Amerin Corporation Equity Award
          Agreements, dated September 17, 1997, between Amerin
          Corporation and Roy J. Kasmar.**(11)
10.34     Amendment No. 1 to Amerin Corporation Equity Award
          Agreements, dated September 17, 1997, between Amerin
          Corporation and Jerome J. Selitto.**(11)
10.35     Amendment No. 1 to Amerin Corporation Equity Award
          Agreements, dated September 17, 1997, between Amerin
          Corporation and Gerald L. Friedman.**(11)
10.36     Amendment No. 1 to Amerin Corporation Equity Award
          Agreements, dated October 7, 1997, between Amerin
          Corporation and William V. Nardiello.**(11)
10.37     Amendment No. 1 to Amerin Corporation Equity Award
          Agreements, dated October 7, 1997, between Amerin
          Corporation and Albert V. Will.**(11)
10.38     Amendment 1999-1 to the CMAC Investment Corporation Equity
          Compensation Plan. *(11)
10.39     Employment Agreement between Roy J. Kasmar and CMAC
          Investment Corporation dated as of March 12, 1999.**(11)
10.40     Change of Control Agreement between Roy J. Kasmar and CMAC
          Investment Corporation dated as of March 12, 1999.**(11)
23.1      Consent of Deloitte & Touche LLP.**
23.2      Consent of Ernst & Young LLP.**
23.3      Consent of Schroders & Co. Inc.**
23.4      Consent of Donaldson, Lufkin & Jenrette Securities
          Corporation.**
23.5      Consent of Morgan, Lewis & Bockius LLP (included in its
          opinions filed as Exhibits 5.1 and 8.1 hereto).**
23.6      Consent of Davis Polk & Wardwell (included in its opinion
          filed as Exhibit 8.2 hereto).**
23.7      Consent of Person to Become a Director -- Roy J. Kasmar.**
23.8      Consent of Person to Become a Director -- Larry E.
          Swedroe.**
23.9      Consent of Person to Become a Director -- Stephen T.
          Hopkins.**
23.10     Consent of Person to Become a Director -- Rosemarie B.
          Greco.**
23.11     Consent of Person to Become a Director -- Howard B.
          Culang.**
</TABLE>
 
                                      II-3
<PAGE>   163
 
<TABLE>
<CAPTION>
EXHIBIT
NUMBER                            DESCRIPTION
- -------                           -----------
<S>       <C>
24        Powers of Attorney (included on the signature page).**
99.1      Form of Proxy - CMAC Investment Corporation.**
99.2      Form of Proxy - Amerin Corporation.**
</TABLE>
 
- ---------------
   * Filed as an Appendix to the Joint Proxy Statement/Prospectus.
 
  ** Filed herewith.
 
 (1) Incorporated by reference to the exhibit identified in parentheses filed as
     an exhibit in the Registrant's Registration Statement on Form S-1 filed
     August 24, 1992 and amendments thereto (File No. 33-51188).
 
 (2) Incorporated by reference to the exhibit identified in parentheses filed as
     an exhibit in the Registrant's Annual Report on Form 10-K filed March 30,
     1993.
 
 (3) Incorporated by reference to the exhibit identified in parentheses filed as
     an exhibit in the Registrant's Annual Report on Form 10-K filed March 30,
     1994.
 
 (4) Incorporated by reference to the exhibit identified in parentheses filed as
     an exhibit in the Registrant's Annual Report on Form 10-K filed March 30,
     1995.
 
 (5) Incorporated by reference to the exhibit identified in parentheses filed as
     an exhibit in the Registrant's Annual Report on Form 10-K filed March 29,
     1996.
 
 (6) Incorporated by reference to the exhibit identified in parentheses filed as
     an exhibit in the Registrant's Annual Report on Form 10-K filed March 31,
     1997.
 
 (7) Incorporated by reference to the exhibit identified in parentheses filed as
     an exhibit in the Registrant's Registration Statement on Form S-8 filed
     November 19, 1997 (File No. 333-40623).
 
 (8) Incorporated by reference to the exhibit identified in parentheses filed as
     an exhibit in the Registrant's Annual Report on Form 10-K filed March 31,
     1998.
 
 (9) Incorporated by reference to the exhibit identified in parentheses filed as
     an exhibit in Amerin Corporation's Registration Statement on Form S-1 (File
     No. 33-97514).
 
(10) Incorporated by reference to the exhibit identified in parentheses filed as
     an exhibit in Amerin Corporation Annual Report on Form 10-K filed March 31,
     1998.
 
(11) Management contract or compensatory plan or arrangement required to be
     filed pursuant to Item 14(c) of Form 10-K.
 
(12) Incorporated by reference to the exhibit identified in parentheses filed as
     an exhibit in the Registrant's Annual Report on Form 10-K/A filed on May 6,
     1999.
 
     (b) Financial Statement Schedules:
 
None.
 
ITEM 22.  UNDERTAKINGS
 
     (1) The undersigned Registrant hereby undertakes:
 
          (a) To file, during any period in which offers or sales are being
     made, a post-effective amendment to this registration statement:
 
             (i) To include any prospectus required by Section 10(a)(3) of the
        Securities Act of 1933;
 
             (ii) To reflect in the prospectus any facts or events arising after
        the effective date of the registration statement (or the most recent
        post-effective amendment thereof) which, individually or in the
        aggregate, represent a fundamental change in the information set forth
        in the registration statement;
 
                                      II-4
<PAGE>   164
 
             (iii) To include any material information with respect to the plan
        of distribution not previously disclosed in the registration statement
        or any material change to such information in the registration
        statement.
 
          (b) That, for the purpose of determining any liability under the
     Securities Act of 1933, each such post-effective amendment shall be deemed
     to be a new registration statement relating to the securities offered
     therein, and the offering of such securities at that time shall be deemed
     to be the initial bona fide offering thereof.
 
          (c) To remove from registration by means of a post-effective amendment
     any of the securities being registered which remain unsold at the
     termination of the offering.
 
     (2) The undersigned Registrant hereby undertakes to respond to requests for
information that is incorporated by reference into the prospectus pursuant to
Items 4, 10(b), 11, or 13 of this form, within one business day of receipt of
such request, and to send the incorporated documents by first class mail or
other equally prompt means. This includes information contained in documents
filed subsequent to the effective date of the registration statement through the
date of responding to the request.
 
     (3) The undersigned Registrant hereby undertakes to supply by means of a
post-effective amendment all information concerning a transaction, and the
company being acquired involved therein, that was not the subject of and
included in the registration statement when it became effective.
 
     (4) The undersigned Registrant hereby undertakes that, for purposes of
determining any liability under the Securities Act of 1933, each filing of the
Registrant's annual report pursuant to section 13(a) or section 15(d) of the
Securities Exchange Act of 1934 (and, where applicable, each filing of an
employee benefit plan's annual report pursuant to section 15(d) of the
Securities Exchange Act of 1934) that is incorporated by reference in the
registration statement shall be deemed to be a new registration statement
relating to the securities offered therein, and the offering of such securities
at that time shall be deemed to be the initial bona fide offering thereof.
 
     (5) Insofar as indemnification for liabilities arising under the Securities
Act of 1933 may be permitted to directors, officers and controlling persons of
the Registrant pursuant to the foregoing provisions, or otherwise, the
Registrant has been advised that in the opinion of the Securities and Exchange
Commission such indemnification is against public policy as expressed in the Act
and is, therefore, unenforceable. In the event that a claim for indemnification
against such liabilities (other than the payment by the Registrant of expenses
incurred or paid by a director, officer or controlling person of the Registrant
in the successful defense of any action, suit or proceeding) is asserted by such
director, officer or controlling person in connection with the securities being
registered, the Registrant will, unless in the opinion of its counsel the matter
has been settled by controlling precedent, submit to a court of appropriate
jurisdiction the question whether such indemnification by it is against public
policy as expressed in the Act and will be governed by the final adjudication of
such issue.
 
     (6) The undersigned Registrant hereby undertakes that:
 
          (a) For purposes of determining any liability under the Securities Act
     of 1933, the information omitted from the prospectus filed as part of this
     registration statement in reliance upon Rule 430A and contained in a form
     of prospectus filed by the Registrant pursuant to Rule 424(b)(1) or (4) or
     497(h) under the Securities Act shall be deemed to be part of this
     registration statement as of the time it was declared effective.
 
          (b) For the purpose of determining any liability under the Securities
     Act of 1933, each post-effective amendment that contains a form of
     prospectus shall be deemed to be a new registration statement relating to
     the securities offered therein, and the offering of such securities at that
     time shall be deemed to be the initial bona fide offering thereof.
 
                                      II-5
<PAGE>   165
 
                                   SIGNATURES
 
     Pursuant to the requirements of the Securities Act of 1933, as amended, the
Registrant has duly caused this registration statement to be signed on its
behalf by the undersigned, thereunto duly authorized, in Philadelphia,
Pennsylvania on May 6, 1999.
 
                                          CMAC INVESTMENT CORPORATION
 
                                          By: /s/ FRANK P. FILIPPS
                                            ------------------------------------
                                              Frank P. Filipps
                                              President and
                                              Chief Executive Officer
 
     Pursuant to the requirements of the Securities Act of 1933, as amended,
this registration statement has been signed below by the following persons in
the capacities and on the dates indicated. Each person whose signature appears
below in so signing also makes, constitutes and appoints Frank P. Filipps and C.
Robert Quint, his true and lawful attorney-in-fact, with full power of
substitution, for him in any and all capacities, to execute and cause to be
filed with the Securities and Exchange Commission any or all amendments and
post-effective amendments to this registration statement, with exhibits thereto
and other documents in connection therewith, and hereby ratifies and confirms
all that said attorney-in-fact or his substitute or substitutes may do or cause
to be done by virtue hereof.
 
<TABLE>
<CAPTION>
                   SIGNATURE                                       TITLE                      DATE
                   ---------                                       -----                      ----
<C>                                               <S>                                      <C>
 
              /s/ FRANK P. FILIPPS                President, Chief Executive Officer and   May 6, 1999
- ------------------------------------------------    Director (principal executive
                Frank P. Filipps                    officer)
 
              /s/ C. ROBERT QUINT                 Senior Vice President and Chief          May 6, 1999
- ------------------------------------------------    Financial Officer (principal
                C. Robert Quint                     financial and accounting officer)
 
               /s/ HERBERT WENDER                 Chairman of the Board of Directors       May 6, 1999
- ------------------------------------------------
                 Herbert Wender
 
             /s/ JAMES W. JENNINGS                Director                                 May 6, 1999
- ------------------------------------------------
               James W. Jennings
 
             /s/ ROBERT W. RICHARDS               Director                                 May 6, 1999
- ------------------------------------------------
               Robert W. Richards
 
              /s/ JAMES C. MILLER                 Director                                 May 6, 1999
- ------------------------------------------------
                James C. Miller
 
            /s/ ANTHONY W. SCHWEIGER              Director                                 May 6, 1999
- ------------------------------------------------
              Anthony W. Schweiger
 
              /s/ DAVID C. CARNEY                 Director                                 May 6, 1999
- ------------------------------------------------
                David C. Carney
</TABLE>
 
                                      II-6
<PAGE>   166
 
<TABLE>
<CAPTION>
                   SIGNATURE                                       TITLE                      DATE
                   ---------                                       -----                      ----
<C>                                               <S>                                      <C>
            /s/ DR. CLAIRE M. FAGIN               Director                                 May 6, 1999
- ------------------------------------------------
              Dr. Claire M. Fagin
 
              /s/ RONALD W. MOORE                 Director                                 May 6, 1999
- ------------------------------------------------
                Ronald W. Moore
</TABLE>
 
                                      II-7

<PAGE>   1
                                                                     EXHIBIT 3.2

                                   B Y L A W S

                                       OF

                                RADIAN GROUP INC.

                            (a Delaware corporation)


                                    ARTICLE I

                             Offices and Fiscal Year

             SECTION 1.01. Registered Office.--The registered office of the
corporation shall be in the City of Wilmington, County of New Castle, State of
Delaware until otherwise established by resolution of the board of directors,
and a certificate certifying the change is filed in the manner provided by
statute.

             SECTION 1.02. Other Offices.--The corporation may also have offices
at such other places within or without the State of Delaware as the board of
directors may from time to time determine or the business of the corporation
requires.

             SECTION 1.03. Fiscal Year.--The fiscal year of the corporation
shall end on the 31st day of December in each year.


                                   ARTICLE II

                           Notice - Waivers - Meetings

             SECTION 2.01. Notice, What Constitutes.--Whenever, under the
provisions of the Delaware General Corporation Law ("GCL") or the certificate of
incorporation or of these By-laws, notice is required to be given to any
director or stockholder, it shall not be construed to require personal notice,
but such notice may be given in writing, by mail or by telegram (with messenger
service specified), electronic transmission or courier service, charges prepaid,
or by telephone or facsimile transmission to the address (or to the e-mail
address, facsimile or telephone number) of the person appearing on the books of
the corporation, or in the case of directors, supplied to the corporation for
the purpose of notice. If the notice is sent by mail, telegram or courier
service, it shall be deemed to be given when deposited in the United States mail
or with a telegraph office or courier service for delivery to that person or, in
the case of electronic transmission, when sent, or in the case of facsimile
transmission, when received.
<PAGE>   2
             SECTION 2.02. Notice of Meetings of Board of Directors.--Notice of
a regular meeting of the board of directors need not be given. Notice of every
special meeting of the board of directors shall be given to each director in
person or by telephone or in writing at least 24 hours (in the case of notice in
person or by telephone, electronic transmission or facsimile transmission) or 48
hours (in the case of notice by telegram, courier service or express mail) or
five days (in the case of notice by first class mail) before the time at which
the meeting is to be held. Every such notice shall state the time and place of
the meeting. Neither the business to be transacted at, nor the purpose of, any
regular or special meeting of the board need be specified in a notice of the
meeting.

             SECTION 2.03. Notice of Meetings of Stockholders.--Written notice
of the place, date and hour of every meeting of the stockholders, whether annual
or special, shall be given to each stockholder of record entitled to vote at the
meeting not less than ten nor more than 60 days before the date of the meeting.
Every notice of a special meeting shall state the purpose or purposes thereof.
If the notice is sent by mail, it shall be deemed to have been given when
deposited in the United States mail, postage prepaid, directed to the
stockholder at the address of the stockholder as it appears on the records of
the corporation.

             SECTION 2.04.  Waivers of Notice.

             (a) Written Waiver.--Whenever notice is required to be given under
any provisions of the GCL or the certificate of incorporation or these By-laws,
a written waiver, signed by the person or persons entitled to the notice,
whether before or after the time stated therein, shall be deemed equivalent to
notice. Neither the business to be transacted at, nor the purpose of, any
regular or special meeting of the stockholders, directors, or members of a
committee of directors need be specified in any written waiver of notice of such
meeting.

             (b) Waiver by Attendance.--Attendance of a person at a meeting,
either in person or by proxy, shall constitute a waiver of notice of such
meeting, except where a person attends a meeting for the express purpose of
objecting at the beginning of the meeting to the transaction of any business
because the meeting was not lawfully called or convened.

             SECTION 2.05.  Exception to Requirements of Notice.

             (a) General Rule.--Whenever notice is required to be given, under
any provision of the GCL or of the certificate of incorporation or these
By-laws, to any person with whom communication is unlawful, the giving of such
notice to such person shall not be required and there shall be no duty to apply
to any governmental authority or agency for a license or permit to give such
notice to such person. Any action or meeting which shall be taken or held
without notice to any such person with whom communication is unlawful shall have
the same force and effect as if such notice had been duly given.

             (b) Stockholders Without Forwarding Addresses.--Whenever notice is
required to be given, under any provision of the GCL or the certificate of
incorporation or these By-laws, to any stockholder to whom (i) notice of two
consecutive annual meetings, and all notices of meetings or of the taking of
action by written consent without a meeting to such person during the period
between such two consecutive annual meetings, or (ii) all, and at least two,
payments (if sent by first class mail) of dividends or interest on securities
during a 12 month period, have been mailed addressed to such person at his
address as shown on the records of the corporation and have been 


                                     PAGE 2
<PAGE>   3
returned undeliverable, the giving of such notice to such person shall not be
required. Any action or meeting which shall be taken or held without notice to
such person shall have the same force and effect as if such notice had been duly
given. If any such person shall deliver to the corporation a written notice
setting forth the person's then current address, the requirement that notice be
given to such person shall be reinstated.



                                     PAGE 3
<PAGE>   4
             SECTION 2.06. Conference Telephone Meetings.--One or more directors
may participate in a meeting of the board, or of a committee of the board, by
means of conference telephone or similar communications equipment by means of
which all persons participating in the meeting can hear each other.
Participation in a meeting pursuant to this section shall constitute presence in
person at such meeting.


                                   ARTICLE III

                            Meetings of Stockholders

             SECTION 3.01. Place of Meeting.--All meetings of the stockholders
of the corporation shall be held at such place within or without the State of
Delaware as shall be designated by the board of directors in the notice of such
meeting.

             SECTION 3.02. Annual Meeting.--The board of directors may fix and
designate the date and time of the annual meeting of the stockholders. At said
meeting the stockholders then entitled to vote shall elect directors and shall
transact such other business as may properly be brought before the meeting.

             SECTION 3.03. Special Meetings.--Special meetings of the
stockholders of the corporation may be called at any time by the chairman of the
board or a majority of the board of directors. At any time, upon the written
request of any person or persons who have duly called a special meeting, which
written request shall state the purpose or purposes of the meeting, it shall be
the duty of the secretary to fix the date of the meeting which shall be held at
such date and time as the secretary may fix, not less than ten nor more than 60
days after the receipt of the request, and to give due notice thereof. If the
secretary shall neglect or refuse to fix the time and date of such meeting and
give notice thereof, the person or persons calling the meeting may do so.

             SECTION 3.04.  Quorum, Manner of Acting and Adjournment.
             (a) Quorum.--The holders of a majority of the shares entitled to
vote, present in person or represented by proxy, shall constitute a quorum at
all meetings of the stockholders except as otherwise provided by the GCL, by the
certificate of incorporation or by these By-laws. If a quorum is not present or
represented at any meeting of the stockholders, the stockholders entitled to
vote thereat, present in person or represented by proxy, shall have power to
adjourn the meeting from time to time, without notice other than announcement at
the meeting, until a quorum is present or represented. At any such adjourned
meeting at which a quorum is present or represented, the corporation may
transact any business which might have been transacted at the original meeting.
If the adjournment is for more than 30 days, or if after the adjournment a new
record date is fixed for the adjourned meeting, a notice of the adjourned
meeting shall be given to each stockholder of record entitled to vote at the
meeting.


                                     PAGE 4
<PAGE>   5
             (b) Manner of Acting.--Directors shall be elected by a plurality of
the votes of the shares present in person or represented by proxy at the meeting
and entitled to vote on the election of directors. In all matters other than the
election of directors, the affirmative vote of the majority of shares present in
person or represented by proxy at the meeting and entitled to vote thereon shall
be the act of the stockholders, unless the question is one upon which, by
express provision of the applicable statute, the certificate of incorporation or
these By-laws, a different vote is required in which case such express provision
shall govern and control the decision of the question. The stockholders present
in person or by proxy at a duly organized meeting can continue to do business
until adjournment, notwithstanding withdrawal of enough stockholders to leave
less than a quorum.

             (c) Stockholder Proposals.--Nominations by stockholders of persons
for election to the board of directors of the corporation may be made at an
annual meeting in compliance with Section 4.13 hereof. The proposal of other
business to be considered by the stockholders at an annual meeting of
stockholders may be made (i) pursuant to the corporation's notice of meeting,
(ii) by or at the direction of the board of directors, or (iii) by any
stockholder of the corporation pursuant to timely notice in writing to the
secretary of the corporation. To be timely, a stockholder's notice shall be
delivered to or mailed to, and received by, the secretary at the principal
executive offices of the corporation not less than 60 days prior to the meeting;
provided, however, that in the event that less than 75 days' notice or prior
public disclosure of the date of the meeting is given or made to stockholders,
notice by the stockholder to be timely must be so received not later than the
close of business on the 15th day following the day on which such notice of the
date of the meeting was mailed or such public disclosure was made. Such
stockholder's notice to the secretary shall set forth (a) as to the stockholder
giving notice and the beneficial owner, if any on whose behalf the proposal is
made, (i) their name and record address, and (ii) the class and number of shares
of capital stock of the corporation which are beneficially owned by each of
them, and (b) a brief description of the business desired to be brought before
the meeting, the reasons for conducting such business at the meeting and any
material interest in such business of such stockholder giving notice and the
beneficial owner, if any, on whose behalf the proposal is made. Only such
business shall be conducted at a special meeting of stockholders as shall have
been brought before the meeting pursuant to the corporation's notice of meeting.
Only such business shall be conducted at a meeting of stockholders as shall have
been brought before the meeting in accordance with the procedures set forth in
this section.

             (d) The chairman of the meeting may, if the facts warrant,
determine and declare to the meeting that any proposal made at the meeting was
not made in accordance with the foregoing procedures and, in such event, the
proposal shall be disregarded. Any decision by the chairman of the meeting shall
be conclusive and binding upon all stockholders of the corporation for any
purpose.

             SECTION 3.05. Organization.--At every meeting of the stockholders,
the chairman of the board, if there be one, or in the case of a vacancy in the
office or absence of the chairman of the board, one of the following persons
present in the order stated: the vice chairman, if one has been appointed, the
president, the vice presidents in their order of rank or seniority, a chairman
designated by the board of directors or a chairman chosen by the stockholders
entitled to cast a majority of the votes which all stockholders present in
person or by proxy are entitled to cast, shall act as chairman, and the
secretary, or, in the absence of the secretary, an assistant secretary, or in


                                     PAGE 5
<PAGE>   6
the absence of the secretary and the assistant secretaries, a person appointed
by the chairman, shall act as secretary.

             SECTION 3.06.  Voting.

             (a) General Rule.--Unless otherwise provided in the certificate of
incorporation, each stockholder shall be entitled to one vote, in person or by
proxy, for each share of capital stock having voting power held by such
stockholder.

             (b)  Voting and Other Action by Proxy.--



                                     PAGE 6
<PAGE>   7
                      (1) A stockholder may execute a writing authorizing
             another person or persons to act for the stockholder as proxy. Such
             execution may be accomplished by the stockholder or the authorized
             officer, director, employee or agent of the stockholder signing
             such writing or causing his or her signature to be affixed to such
             writing by any reasonable means including, but not limited to, by
             facsimile signature. A stockholder may authorize another person or
             persons to act for the stockholder as proxy by transmitting or
             authorizing the transmission of a telegram, cablegram, or other
             means of electronic transmission to the person who will be the
             holder of the proxy or to a proxy solicitation firm, proxy support
             service organization or like agent duly authorized by the person
             who will be the holder of the proxy to receive such transmission if
             such telegram, cablegram or other means of electronic transmission
             sets forth or is submitted with information from which it can be
             determined that the telegram, cablegram or other electronic
             transmission was authorized by the stockholder.

                      (2) No proxy shall be voted or acted upon after three
             years from its date, unless the proxy provides for a longer period.

                      (3) A duly executed proxy shall be irrevocable if it
             states that it is irrevocable and if, and only so long as, it is
             coupled with an interest sufficient in law to support an
             irrevocable power. A proxy may be made irrevocable regardless of
             whether the interest with which it is coupled is an interest in the
             stock itself or an interest in the corporation generally.

             SECTION 3.07. Voting Lists.--The officer who has charge of the
stock ledger of the corporation shall prepare and make, at least ten days before
every meeting of stockholders, a complete list of the stockholders entitled to
vote at the meeting. The list shall be arranged in alphabetical order, showing
the address of each stockholder and the number of shares registered in the name
of each stockholder. Such list shall be open to the examination of any
stockholder, for any purpose germane to the meeting, during ordinary business
hours, for a period of at least ten days prior to the meeting either at a place
within the city where the meeting is to be held, which place shall be specified
in the notice of the meeting, or, if not so specified, at the place where the
meeting is to be held. The list shall also be produced and kept at the time and
place of the meeting during the whole time thereof, and may be inspected by any
stockholder who is present.

             SECTION 3.08.  Inspectors of Election.

             (a) Appointment.--All elections of directors shall be by written
ballot; the vote upon any other matter need not be by ballot. In advance of any
meeting of stockholders the board of directors may appoint one or more
inspectors, who need not be stockholders, to act at the meeting and to make a
written report thereof. The board of directors may designate one or more persons
as alternate inspectors to replace any inspector who fails to act. If no
inspector or alternate is able to act at a meeting of stockholders, the person
presiding at the meeting shall appoint one or more inspectors to act at the
meeting. Each inspector, before entering upon the discharge of his or her
duties, shall take and sign an oath faithfully to execute the duties of
inspector with strict impartiality and according to the person's best ability.


                                     PAGE 7
<PAGE>   8
             (b) Duties.--The inspectors shall ascertain the number of shares
outstanding and the voting power of each, shall determine the shares represented
at the meeting and the validity of proxies and ballots, shall count all votes
and ballots, shall determine and retain for a reasonable period a record of the
disposition of any challenges made to any determination by the inspectors, and
shall certify their determination of the number of shares represented at the
meeting and their count of all votes and ballots. The inspectors may appoint or
retain other persons or entities to assist the inspectors in the performance of
the duties of the inspectors.

             (c) Polls.--The date and time of the opening and the closing of the
polls for each matter upon which the stockholders will vote at a meeting shall
be announced at the meeting. No ballot, proxies or votes, nor any revocations
thereof or changes thereto, shall be accepted by the inspectors after the
closing of the polls unless the Court of Chancery upon application by a
stockholder shall determine otherwise.

             (d) Reconciliation of Proxies and Ballots.--In determining the
validity and counting of proxies and ballots, the inspectors shall be limited to
an examination of the proxies, any envelopes submitted with those proxies, any
information transmitted in accordance with section 3.06, ballots and the regular
books and records of the corporation, except that the inspectors may consider
other reliable information for the limited purpose of reconciling proxies and
ballots submitted by or on behalf of banks, brokers, their nominees or similar
persons which represent more votes than the holder of a proxy is authorized by
the record owner to cast or more votes than the stockholder holds of record. If
the inspectors consider other reliable information for the limited purpose
permitted herein, the inspectors at the time they make their certification
pursuant to subsection (b) shall specify the precise information considered by
them including the person or persons from whom they obtained the information,
when the information was obtained, the means by which the information was
obtained and the basis for the inspectors' belief that such information is
accurate and reliable.


                                   ARTICLE IV

                               Board of Directors

             SECTION 4.01. Powers.--All powers vested by law in the corporation
shall be exercised by or under the authority of, and the business and affairs of
the corporation shall be managed under the direction of, the board of directors.

             SECTION 4.02. Number.--Subject to the provisions of the certificate
of incorporation, the board of directors shall consist of such number of
directors as may be determined (a) until the corporation's annual stockholder
meeting to be held in the year 2000, by resolution adopted by two thirds of the
entire board of directors and (b) thereafter, only by resolution adopted by of a
majority of the directors present at a meeting at which a quorum is present.

             SECTION 4.03. Term of Office. Subject to the provisions of the
certificate of incorporation, directors of the corporation shall hold office
until the next annual meeting of stockholders and until their successors shall
have been elected and qualified, except in the event of death, resignation or
removal.

             SECTION 4.04.  Vacancies.


                                     PAGE 8
<PAGE>   9
                                     PAGE 9
<PAGE>   10
                      (a) Vacancies and newly created directorships resulting
from any increase in the authorized number of directors may be filled (i) until
the corporation's annual stockholder meeting to be held in the year 2000, by
resolution adopted by two thirds of the directors then in office and (ii)
thereafter, by resolution adopted by a majority of the directors then in office,
present at a meeting at which a quorum is present, and a director so chosen
shall hold office until the next annual election of the class for which such
director shall have been elected and until a successor is duly elected and
qualified. If there are no directors in office, then an election of directors
may be held in the manner provided by statute.

                      (b) Whenever the holders of any class or classes of stock
or series thereof are entitled to elect one or more directors by the provisions
of the certificate of incorporation, vacancies and newly created directorships
of such class or classes or series may be filled by a majority of the directors
elected by such class or classes or series thereof then in office, or by a sole
remaining director so elected.

                      (c) If, at the time of filling any vacancy or any newly
created directorship, the directors then in office shall constitute less than a
majority of the entire board (as constituted immediately prior to any such
increase), the Court of Chancery may, upon application of any stockholder or
stockholders holding at least ten percent of the total number of the shares at
the time outstanding having the right to vote for such directors, summarily
order an election to be held to fill any such vacancies or newly created
directorship, or to replace the directors chosen by the directors then in
office.

             SECTION 4.05. Resignations.--Any director may resign at any time
upon written notice to the chairman, president or secretary of the corporation.
The resignation shall be effective upon receipt thereof by the corporation or at
such subsequent time as shall be specified in the notice of resignation and,
unless otherwise specified in the notice, the acceptance of the resignation
shall not be necessary to make it effective.

             SECTION 4.06. Organization.--At every meeting of the board of
directors, the chairman of the board, if there be one, or, in the case of a
vacancy in the office or absence of the chairman of the board, one of the
following officers present in the order stated: the vice chairman of the board,
if there be one, the president, the vice presidents in their order of rank and
seniority, or a chairman chosen by a majority of the directors present, shall
preside, and the secretary, or, in the absence of the secretary, an assistant
secretary, or in the absence of the secretary and the assistant secretaries, any
person appointed by the chairman of the meeting, shall act as secretary.

             SECTION 4.07. Place of Meeting.--Meetings of the board of
directors, both regular and special, shall be held at such place within or
without the State of Delaware as the board of directors may from time to time
determine, or as may be designated in the notice of the meeting.

             SECTION 4.08. Regular Meetings.--Regular meetings of the board of
directors shall be held without notice at such time and place as shall be
designated from time to time by resolution of the board of directors.

             SECTION 4.09. Special Meetings.--Special meetings of the board of
directors shall be held whenever called by the chairman, by three or more of the
directors.


                                     PAGE 10
<PAGE>   11
             SECTION 4.10.  Quorum, Manner of Acting and Adjournment.




                                     PAGE 11
<PAGE>   12
             (a) General Rule.--At all meetings of the board of directors (i)
until the corporation's annual stockholder meeting to be held in the year 2000,
two thirds of the entire board of directors shall constitute a quorum for the
transaction of business and (ii) thereafter, a majority of the entire board of
directors shall constitute a quorum for the transaction of business. The vote of
a majority of the directors present at any meeting at which a quorum is present
shall be the act of the board of directors, except as may be otherwise
specifically provided by the GCL or by the certificate of incorporation. If a
quorum is not present at any meeting of the board of directors, the directors
present thereat may adjourn the meeting from time to time, without notice other
than announcement at the meeting, until a quorum is present.

             (b) Unanimous Written Consent.--Unless otherwise restricted by the
certificate of incorporation, any action required or permitted to be taken at
any meeting of the board of directors may be taken without a meeting, if all
members of the board consent thereto in writing, and the writing or writings are
filed with the minutes of proceedings of the board.

             SECTION 4.11.  Committees of the Board.

             (a) Establishment.--The board of directors may, by resolution
adopted by a majority of the entire board, establish an Executive Committee and
one or more other committees, each committee to consist of one or more
directors. The board may designate one or more directors as alternate members of
any committee, who may replace any absent or disqualified member at any meeting
of the committee. In the absence or disqualification of a member of a committee
and the alternate or alternates, if any, designated for such member, the member
or members of the committee present at any meeting and not disqualified from
voting, whether or not they constitute a quorum, may unanimously appoint another
director to act at the meeting in the place of any such absent or disqualified
member.

             (b) Powers.--The Executive Committee, if established, and any such
other committee, to the extent provided in the resolution establishing such
committee, shall have and may exercise all the power and authority of the board
of directors in the management of the business and affairs of the corporation
and may authorize the seal of the corporation to be affixed to all papers which
may require it; but no such committee shall have such power or authority in
reference to amending the certificate of incorporation (except that a committee
may, to the extent authorized in the resolution or resolutions providing for the
issuance of shares of stock adopted by the board of directors as provided in
Section 151(a) of the GCL, fix the designation and any of the preferences or
rights of such shares relating to dividends, redemption, dissolution, any
distribution of assets of the corporation or the conversion into, or the
exchange of such shares for, shares of any other class or classes or any other
series of the same or any other class or classes of stock of the corporation or
fix the number of shares of any series of stock or authorize the increase or
decrease of shares of any series), adopting an agreement of merger or
consolidation under Section 251, 252, 254, 255, 256, 257, 258, 263 or 264 of the
GCL, recommending to the stockholders the sale, lease or exchange of all or
substantially all of the corporation's property and assets, recommending to the
stockholders a dissolution of the corporation or a revocation of a dissolution,
or amending the By-laws of the corporation. The Executive Committee shall have
the power or authority to declare a dividend, to authorize the issuance of stock
and to adopt a certificate of ownership and merger pursuant to Section 253 of
the GCL. Such committee or committees shall have such name or names as may be
determined from time to time by resolution adopted by the board of directors.
Each committee so formed shall keep regular minutes of its meetings and report
the same to the board of directors when required.


                                     PAGE 12
<PAGE>   13
             (c) Committee Procedures.--The term "board of directors" or
"board," when used in any provision of these By-laws relating to the
organization or procedures of or the manner of taking action by the board of
directors, shall be construed to include and refer to the Executive Committee or
other committee of the board.



                                     PAGE 13
<PAGE>   14
             SECTION 4.12. Compensation of Directors.--Unless otherwise
restricted by the certificate of incorporation, the board of directors shall
have the authority to fix the compensation of directors. The directors may be
paid their expenses, if any, of attendance at each meeting of the board of
directors and may be paid a fixed sum for attendance at each meeting of the
board of directors or a stated salary as director. No such payment shall
preclude any director from serving the corporation in any other capacity and
receiving compensation therefor. Members of special or standing committees may
be allowed like compensation for attending committee meetings.

             SECTION 4.13. Qualifications and Election of Directors.

                      (a) All directors of the corporation shall be natural
persons of full age, but need not be residents of Delaware or stockholders of
the corporation. Except in the case of vacancies, directors shall be elected by
the stockholders. If directors of more than one class are to be elected, each
class of directors to be elected at a meeting of stockholders shall be nominated
and elected separately. No person who has reached 70 years of age may be elected
or appointed to a term of office as a director of the corporation. The term of
office of any director elected or appointed in conformity with the preceding
sentence shall continue (to the extent provided in the certificate of
incorporation and these Bylaws) after such director reaches 70 years of age.

                      (b) Nominations of persons for election to the board of
directors of the corporation may be made at a meeting of stockholders by or at
the direction of the board of directors.

                      (c) Nominations of persons for election to the board of
directors of the corporation may also be made by any stockholder of the
corporation entitled to vote for the election of directors at a meeting of
stockholders who complies with the notice procedures set forth in this Section
4.13 (c). Such nominations shall be made pursuant to timely notice in writing to
the secretary of the corporation. To be timely, a stockholder's notice shall be
delivered to or mailed to, and received by, the secretary at the principal
executive offices of the corporation not less than 60 days prior to the meeting;
provided, however, that in the event that less than 75 days' notice or prior
public disclosure of the date of the meeting is given or made to stockholders,
notice by the stockholder to be timely must be so received not later than the
close of business on the 15th day following the day on which such notice of the
date of the meeting was mailed or such public disclosure was made. Such
stockholder's notice to the secretary shall set forth (a) as to each person whom
the stockholder proposes to nominate for election or re-election as a director,
(i) the name, age, business address and residence address of the person, (ii)
the principal occupation or employment of the person, (iii) the class and number
of shares of capital stock of the corporation which are beneficially owned by
the person, and (iv) any other information relating to the person that is
required to be disclosed in solicitations for proxies for election of directors
pursuant to the rules and regulations promulgated under the Securities Exchange
Act of 1934, as amended; and (b) as to the stockholder giving the notice (i) the
name and record address of the stockholder and (ii) the class and number of
shares of capital stock of the corporation which are beneficially owned by the
stockholder. The corporation may require any proposed nominee to furnish such
other information as may reasonably be required by the corporation to determine
the eligibility of such proposed nominee to serve as a director of the
corporation. No person shall be eligible for election as a director by the
stockholders of the corporation unless nominated in accordance with the
procedures set forth herein.



                                     PAGE 14
<PAGE>   15
                      (d) The chairman of the meeting may, if the facts warrant,
determine and declare to the meeting that any nomination made at the meeting was
not made in accordance with the foregoing procedures and, in such event, the
nomination shall be disregarded. Any decision by the chairman of the meeting
shall be conclusive and binding upon all stockholders of the corporation for any
purpose.

             SECTION 4.14. Voting of Stock. Unless otherwise ordered by the
board of directors, each of the chairman of the board, the principal executive
officer (as identified in the corporation's most recent report filed with the
United States Securities and Exchange Commission) and the principal accounting
officer (as identified in the corporation's most recent report filed with the
United States Securities and Exchange Commission) shall have full power and
authority, on behalf of the corporation, to attend and to act and vote, in
person or by proxy, at any meeting of the stockholders of any company in which
the corporation may hold stock, and at any such meeting shall possess and may
exercise any and all of the rights and powers incident to the ownership of such
stock which, as the owner thereof, the corporation might have possessed and
exercised if present. The board of directors, by resolution adopted from time to
time, may confer like powers upon any other person or persons.

             SECTION 4.15. Endorsement of Securities for Transfer. Each of the
chairman of the board, the principal executive officer and the principal
accounting officer shall have the power to endorse and deliver for sale,
assignment or transfer certificates for stock, bonds or other securities,
registered in the name of or belonging to the corporation, whether issued by the
corporation or by any other corporation, government, state or municipality or
agency thereof; and the board of directors from time to time may confer like
power upon any other officer, agent or person by resolution adopted from time to
time. Every such endorsement shall be countersigned by the treasurer or an
assistant treasurer.

             SECTION 4.16. Lead Director. The directors will elect one of their
numbers to serve as Lead Director. The Lead Director will assume such duties as
the directors may designate from time to time. Notwithstanding anything
contained in Section 8.06, this Section 4.16 may only be altered, amended or
repealed (a) by vote of the stockholders at a duly organized annual or special
meeting of stockholders in accordance with the certificate of incorporation, or
(b) by vote of 75% of the entire board of directors at any regular or special
meeting of directors.


                                    ARTICLE V

                                    Officers

             SECTION 5.01. Number, Qualifications and Designation.--The officers
of the corporation shall be chosen by the board of directors and shall be a
president, one or more vice presidents, a secretary, a treasurer, and such other
officers as may be elected in accordance with the provisions of section 5.03 of
this Article. Any number of offices may be held by the same person. Officers
may, but need not, be directors or stockholders of the corporation. The board of
directors may elect from among the members of the board a chairman of the board
and a vice chairman of the board.


                                     PAGE 15
<PAGE>   16
             SECTION 5.02. Election and Term of Office.--The officers of the
corporation, except those elected by delegated authority pursuant to section
5.03 of this Article, shall be elected annually by the board of directors, and
each such officer shall hold office for a term of one year and until a successor
is elected and qualified, or until his or her earlier resignation or removal.
Any officer may resign at any time upon written notice to the corporation.



                                     PAGE 16
<PAGE>   17
             SECTION 5.03. Subordinate Officers, Committees and Agents.--The
board of directors may from time to time elect such other officers and appoint
such committees, employees or other agents as it deems necessary, who shall hold
their offices for such terms and shall exercise such powers and perform such
duties as are provided in these By-laws, or as the board of directors may from
time to time determine. The board of directors may delegate to any officer or
committee the power to elect subordinate officers and to retain or appoint
employees or other agents, or committees thereof, and to prescribe the authority
and duties of such subordinate officers, committees, employees or other agents.

             SECTION 5.04. The Chairman and Vice Chairman of the Board.--The
chairman of the board, or in the absence of the chairman, the vice chairman of
the board, if there be one, shall preside at all meetings of the stockholders
and of the board of directors, and shall perform such other duties as may from
time to time be assigned to them by the board of directors.

             SECTION 5.05. The Chairman of the Board.--The chairman of the board
shall be the chief executive officer of the corporation and shall have general
supervision over the business and operations of the corporation, subject,
however, to the control of the board of directors, and shall perform all duties
incident to his office which may be required by law and all such other duties as
are properly required of him by the board of directors. He shall make reports to
the board of directors and the stockholders, and shall see that all orders and
resolutions of the board of directors and of any committee thereof are carried
into effect.

             SECTION 5.06. The President.--The president shall be the chief
operating officer of the corporation and shall perform such duties as may from
time to time be assigned to him by the board of directors or by the chairman of
the board.

             SECTION 5.07. The Vice Presidents.--The vice presidents shall
perform the duties of the chairman of the board and president in his absence
and such other duties as may from time to time be assigned to them by the board
of directors or by the chairman of the board.

             SECTION 5.08. The Secretary.--The secretary, or an assistant
secretary, shall attend all meetings of the stockholders and of the board of
directors and shall record the proceedings of the stockholders and of the
directors and of committees of the board in a book or books to be kept for that
purpose; shall see that notices are given and records and reports properly kept
and filed by the corporation as required by law; shall be the custodian of the
seal of the corporation and see that it is affixed to all documents to be
executed on behalf of the corporation under its seal; and, in general, shall
perform all duties incident to the office of secretary, and such other duties as
may from time to time be assigned by the board of directors or the chairman of
the board.


                                     PAGE 17
<PAGE>   18
             SECTION 5.09. The Treasurer.--The treasurer, or an assistant
treasurer, shall have or provide for the custody of the funds or other property
of the corporation; shall collect and receive or provide for the collection and
receipt of moneys earned by or in any manner due to or received by the
corporation; shall deposit all funds in his or her custody as treasurer in such
banks or other places of deposit as the board of directors may from time to time
designate; whenever so required by the board of directors, shall render an
account showing his or her transactions as treasurer and the financial condition
of the corporation; and, in general, shall discharge such other duties as may
from time to time be assigned by the board of directors or the chairman of the
board.

             SECTION 5.10. Officers' Bonds.--No officer of the corporation need
provide a bond to guarantee the faithful discharge of the officer's duties
unless the board of directors shall by resolution so require a bond in which
event such officer shall give the corporation a bond (which shall be renewed if
and as required) in such sum and with such surety or sureties as shall be
satisfactory to the board of directors for the faithful performance of the
duties of office.

             SECTION 5.11. Salaries.--The salaries of the officers and agents of
the corporation elected by the board of directors shall be fixed from time to
time by the board of directors.


                                   ARTICLE VI

                      Certificates of Stock, Transfer, Etc.

             SECTION 6.01.  Form and Issuance.

             (a) Issuance.--The shares of the corporation shall be represented
by certificates unless the board of directors shall by resolution provide that
some or all of any class or series of stock shall be uncertificated shares. Any
such resolution shall not apply to shares represented by a certificate until the
certificate is surrendered to the corporation. Notwithstanding the adoption of
any resolution providing for uncertificated shares, every holder of stock
represented by certificates and upon request every holder of uncertificated
shares shall be entitled to have a certificate signed by, or in the name of the
corporation by, the chairman or vice chairman of the board of directors, or the
president or vice president, and by the treasurer or an assistant treasurer, or
the secretary or an assistant secretary, representing the number of shares
registered in certificate form.

             (b) Form and Records.--Stock certificates of the corporation shall
be in such form as approved by the board of directors. The stock record books
and the blank stock certificate books shall be kept by the secretary or by any
agency designated by the board of directors for that purpose. The stock
certificates of the corporation shall be numbered and registered in the stock
ledger and transfer books of the corporation as they are issued.

             (c) Signatures.--Any of or all the signatures upon the stock
certificates of the corporation may be a facsimile. In case any officer,
transfer agent or registrar who has signed, or whose facsimile signature has
been placed upon, any share certificate shall have ceased to be such officer,
transfer agent or registrar, before the certificate is issued, it may be issued
with the same effect as if the signatory were such officer, transfer agent or
registrar at the date of its issue.

             SECTION 6.02. Transfer.--Transfers of shares shall be made on the
share register or transfer books of the corporation upon surrender of the
certificate therefor, endorsed by the person 


                                     PAGE 18
<PAGE>   19
named in the certificate or by an attorney lawfully constituted in writing. No
transfer shall be made which would be inconsistent with the provisions of
Article 8, Title 6 of the Delaware Uniform Commercial Code-Investment
Securities.



                                     PAGE 19
<PAGE>   20
             SECTION 6.03. Lost, Stolen, Destroyed or Mutilated
Certificates.--The board of directors may direct a new certificate of stock or
uncertificated shares to be issued in place of any certificate theretofore
issued by the corporation alleged to have been lost, stolen or destroyed, upon
the making of an affidavit of that fact by the person claiming the certificate
of stock to be lost, stolen or destroyed. When authorizing such issue of a new
certificate or certificates, the board of directors may, in its discretion and
as a condition precedent to the issuance thereof, require the owner of such
lost, stolen or destroyed certificate or certificates, or the legal
representative of the owner, to give the corporation a bond sufficient to
indemnify against any claim that may be made against the corporation on account
of the alleged loss, theft or destruction of such certificate or the issuance of
such new certificate or uncertificated shares.

             SECTION 6.04. Record Holder of Shares.--The corporation shall be
entitled to recognize the exclusive right of a person registered on its books as
the owner of shares to receive dividends, and to vote as such owner, and to hold
liable for calls and assessments a person registered on its books as the owner
of shares, and shall not be bound to recognize any equitable or other claim to
or interest in such share or shares on the part of any other person, whether or
not it shall have express or other notice thereof, except as otherwise provided
by the laws of Delaware.

             SECTION 6.05.  Determination of Stockholders of Record.

             (a) Meetings of Stockholders.--In order that the corporation may
determine the stockholders entitled to notice of or to vote at any meeting of
stockholders or any adjournment thereof, the board of directors may fix a record
date, which record date shall not precede the date upon which the resolution
fixing the record date is adopted by the board of directors, and which record
date shall not be more than 60 nor less than ten days before the date of such
meeting. If no record date is fixed by the board of directors, the record date
for determining stockholders entitled to notice of or to vote at a meeting of
stockholders shall be at the close of business on the day next preceding the day
on which notice is given, or, if notice is waived, at the close of business on
the day next preceding the day on which the meeting is held. A determination of
stockholders of record entitled to notice of or to vote at a meeting of
stockholders shall apply to any adjournment of the meeting unless the board of
directors fixes a new record date for the adjourned meeting.

             (b) Consent of Stockholders.--In order that the corporation may
determine the stockholders entitled to consent to corporate action in writing
without a meeting, the board of directors may fix a record date, which record
date shall not precede the date upon which the resolution fixing the record date
is adopted by the board of directors, and which date shall not be more than ten
days after the date upon which the resolution fixing the record date is adopted
by the board of directors. If no record date has been fixed by the board of
directors, the record date for determining stockholders entitled to consent to
corporate action in writing without a meeting, when no prior action by the board
of directors is required by the GCL, shall be the first date on which a signed
written consent setting forth the action taken or proposed to be taken is
delivered to the corporation by delivery to its registered office in Delaware,
its principal place of business, or an officer or agent of the corporation
having custody of the book in which proceedings of meetings of stockholders are
recorded. Delivery made to a corporation's registered office shall be by hand or
by certified or registered mail, return receipt requested. If no record date has
been fixed by the board of directors and prior action by the board of directors
is required by the GCL, the record date for determining stockholders entitled to
consent to corporate action in writing 



                                     PAGE 20
<PAGE>   21
without a meeting shall be at the close of business on the day on which the
board of directors adopts the resolution taking such prior action.


                                     PAGE 21
<PAGE>   22
             (c) Dividends.--In order that the corporation may determine the
stockholders entitled to receive payment of any dividend or other distribution
or allotment of any rights of the stockholders entitled to exercise any rights
in respect of any change, conversion or exchange of stock, or for the purpose of
any other lawful action, the board of directors may fix a record date, which
record date shall not precede the date upon which the resolution fixing the
record date is adopted, and which record date shall be not more than 60 days
prior to such action. If no record date is fixed, the record date for
determining stockholders for any such purpose shall be at the close of business
on the day on which the board of directors adopts the resolution relating
thereto.


                                   ARTICLE VII

                   Indemnification of Directors, Officers and
                        Other Authorized Representatives

             SECTION 7.01. Indemnification of Authorized Representatives in
Third Party Proceedings.--The corporation shall indemnify any person who was or
is an authorized representative of the corporation, and who was or is a party,
or is threatened to be made a party to any third party proceeding, by reason of
the fact that such person was or is an authorized representative of the
corporation, against expenses, judgments, fines and amounts paid in settlement
actually and reasonably incurred by such person in connection with such third
party proceeding if such person acted in good faith and in a manner such person
reasonably believed to be in, or not opposed to, the best interests of the
corporation and, with respect to any criminal third party proceeding, had no
reasonable cause to believe such conduct was unlawful. The termination of any
third party proceeding by judgment, order, settlement, conviction or upon a plea
of nolo contendere or its equivalent, shall not of itself create a presumption
that the authorized representative did not act in good faith and in a manner
which such person reasonably believed to be in or not opposed to, the best
interests of the corporation, and, with respect to any criminal third party
proceeding, had reasonable cause to believe that such conduct was unlawful.

             SECTION 7.02. Indemnification of Authorized Representatives in
Corporate Proceedings.--The corporation shall indemnify any person who was or is
an authorized representative of the corporation and who was or is a party or is
threatened to be made a party to any corporate proceeding, by reason of the fact
that such person was or is an authorized representative of the corporation,
against expenses actually and reasonably incurred by such person in connection
with the defense or settlement of such corporate proceeding if such person acted
in good faith and in a manner reasonably believed to be in, or not opposed to,
the best interests of the corporation and except that no indemnification shall
be made in respect of any claim, issue or matter as to which such person shall
have been adjudged to be liable to the corporation unless and only to the extent
that the Court of Chancery or the court in which such corporate proceeding was
brought shall determine upon application that, despite the adjudication of
liability but in view of all the circumstances of the case, such authorized
representative is fairly and reasonably entitled to indemnity for such expenses
which the Court of Chancery or such other court shall deem proper.

             SECTION 7.03. Mandatory Indemnification of Authorized
Representatives.--To the extent that an authorized representative or other
employee or agent of the corporation has been successful on the merits or
otherwise in defense of any third party or corporate proceeding or in 


                                     PAGE 22
<PAGE>   23
defense of any claim, issue or matter therein, such person shall be indemnified
against expenses actually and reasonably incurred by such person in connection
therewith.



                                     PAGE 23
<PAGE>   24
             SECTION 7.04. Determination of Entitlement to Indemnification.--Any
indemnification under section 7.01, 7.02 or 7.03 of this Article (unless ordered
by a court) shall be made by the corporation only as authorized in the specific
case upon a determination that indemnification of the authorized representative
or other employee or agent is proper in the circumstances because such person
has either met the applicable standard of conduct set forth in section 7.01 or
7.02 or has been successful on the merits or otherwise as set forth in section
7.03 and that the amount requested has been actually and reasonably incurred.
Such determination shall be made:

                      (1) by the board of directors by a majority vote of a
             quorum consisting of directors who were not parties to such third
             party or corporate proceeding; or

                      (2) if such a quorum is not obtainable, or even if
             obtainable, a quorum of disinterested directors so directs, by
             independent legal counsel in a written opinion; or

                      (3) by the stockholders.

             SECTION 7.05. Advancing Expenses.--Expenses actually and reasonably
incurred in defending a third party or corporate proceeding shall be paid on
behalf of an authorized representative by the corporation in advance of the
final disposition of such third party or corporate proceeding upon receipt of an
undertaking by or on behalf of the authorized representative to repay such
amount if it shall ultimately be determined that the authorized representative
is not entitled to be indemnified by the corporation as authorized in this
Article. The financial ability of any authorized representative to make a
repayment contemplated by this section shall not be a prerequisite to the making
of an advance. Expenses incurred by other employees and agents may be so paid
upon such terms and conditions, if any, as the board of directors deems
appropriate.

             SECTION 7.06.  Definitions.--For purposes of this Article:

                      (1) "authorized representative" shall mean any and all
             directors and officers of the corporation and any person designated
             as an authorized representative by the board of directors of the
             corporation (which may, but need not, include any person serving at
             the request of the corporation as a director, officer, employee or
             agent of another corporation, partnership, joint venture, trust or
             other enterprise);

                      (2) "corporation" shall include, in addition to the
             resulting corporation, any constituent corporation (including any
             constituent of a constituent) absorbed in a consolidation or merger
             which, if its separate existence had continued, would have had
             power and authority to indemnify its directors, officers, employees
             or agents, so that any person who is or was a director, officer,
             employee or agent of such constituent corporation, or is or was
             serving at the request of such constituent corporation as a
             director, officer, employee or agent of another corporation,
             partnership, joint venture, trust or other enterprise, shall stand
             in the same position under the provisions of this Article with
             respect to the resulting or surviving corporation as such person
             would have with respect to such constituent corporation if its
             separate existence had continued;


                                     PAGE 24
<PAGE>   25
                      (3) "corporate proceeding" shall mean any threatened,
             pending or completed action or suit by or in the right of the
             corporation to procure a judgment in its favor or investigative
             proceeding by the corporation;

                      (4) "criminal third party proceeding" shall include any
             action or investigation which could or does lead to a criminal
             third party proceeding;

                      (5) "expenses" shall include attorneys' fees and
             disbursements;

                      (6) "fines" shall include any excise taxes assessed on a
             person with respect to an employee benefit plan;

                      (7) "not opposed to the best interests of the corporation"
             shall include actions taken in good faith and in a manner the
             authorized representative reasonably believed to be in the interest
             of the participants and beneficiaries of an employee benefit plan;

                      (8) "other enterprises" shall include employee benefit
             plans;

                      (9) "party" shall include the giving of testimony or
             similar involvement;

                      (10) "serving at the request of the corporation" shall
             include any service as a director, officer or employee of the
             corporation which imposes duties on, or involves services by, such
             director, officer or employee with respect to an employee benefit
             plan, its participants, or beneficiaries; and

                      (11) "third party proceeding" shall mean any threatened,
             pending or completed action, suit or proceeding, whether civil,
             criminal, administrative, or investigative, other than an action by
             or in the right of the corporation.

                      SECTION 7.07. Insurance.--The corporation may purchase and
maintain insurance on behalf of any person who is or was a director, officer,
employee or agent of the corporation, or is or was serving at the request of the
corporation as a director, officer, employee or agent of another corporation,
partnership, joint venture, trust or other enterprise against any liability
asserted against the person and incurred by the person in any such capacity, or
arising out of his or her status as such, whether or not the corporation would
have the power or the obligation to indemnify such person against such liability
under the provisions of this Article.

                      SECTION 7.08. Scope of Article.--The indemnification of
authorized representatives and advancement of expenses, as authorized by the
preceding provisions of this Article, shall not be deemed exclusive of any other
rights to which those seeking indemnification or advancement of expenses may be
entitled under any agreement, vote of stockholders or disinterested directors or
otherwise, both as to action in an official capacity and as to action in another
capacity while holding such office. The indemnification and advancement of
expenses provided by or granted pursuant to this Article shall, unless otherwise
provided when authorized or ratified, continue as to a person who has ceased to
be an authorized representative and shall inure to the benefit of the heirs,
executors and administrators of such a person.


                                     PAGE 25
<PAGE>   26
                      SECTION 7.09. Reliance on Provisions.--Each person who
shall act as an authorized representative of the corporation shall be deemed to
be doing so in reliance upon rights of indemnification provided by this Article.


                                  ARTICLE VIII

                               General Provisions

                      SECTION 8.01. Dividends.--Subject to the restrictions
contained in the GCL and any restrictions contained in the certificate of
incorporation, the board of directors may declare and pay dividends upon the
shares of capital stock of the corporation.

                      SECTION 8.02. Contracts.--Except as otherwise provided in
these By-laws, the board of directors may authorize any officer or officers
including the chairman and vice chairman of the board of directors, or any agent
or agents, to enter into any contract or to execute or deliver any instrument on
behalf of the corporation and such authority may be general or confined to
specific instances. Any officer so authorized may, unless the authorizing
resolution otherwise provides, delegate such authority to one or more
subordinate officers, employees or agents, and such delegation may provide for
further delegation.

                      SECTION 8.03. Corporate Seal.--The corporation shall have
a corporate seal, which shall have inscribed thereon the name of the
corporation, the year of its organization and the words "Corporate Seal,
Delaware". The seal may be used by causing it or a facsimile thereof to be
impressed or affixed or in any other manner reproduced.

                      SECTION 8.04. Deposits.--All funds of the corporation
shall be deposited from time to time to the credit of the corporation in such
banks, trust companies, or other depositories as the board of directors may
approve or designate, and all such funds shall be withdrawn only upon checks
signed by such one or more officers or employees as the board of directors shall
from time to time determine.

                      SECTION 8.05. Corporate Records.



                                     PAGE 26
<PAGE>   27
                      (a) Examination by Stockholders.--Every stockholder shall,
upon written demand under oath stating the purpose thereof, have a right to
examine, in person or by agent or attorney, during the usual hours for business,
for any proper purpose, the stock ledger, list of stockholders, books or records
of account, and records of the proceedings of the stockholders and directors of
the corporation, and to make copies or extracts therefrom. A proper purpose
shall mean a purpose reasonably related to such person's interest as a
stockholder. In every instance where an attorney or other agent shall be the
person who seeks the right to inspection, the demand under oath shall be
accompanied by a power of attorney or such other writing which authorizes the
attorney or other agent to so act on behalf of the stockholder. The demand under
oath shall be directed to the corporation at its registered office in Delaware
or at its principal place of business. Where the stockholder seeks to inspect
the books and records of the corporation, other than its stock ledger or list of
stockholders, the stockholder shall first establish (1) that the stockholder has
complied with the provisions of this section respecting the form and manner of
making demand for inspection of such documents; and (2) that the inspection
sought is for a proper purpose. Where the stockholder seeks to inspect the stock
ledger or list of stockholders of the corporation and has complied with the
provisions of this section respecting the form and manner of making demand for
inspection of such documents, the burden of proof shall be upon the corporation
to establish that the inspection sought is for an improper purpose.

                      (b) Examination by Directors.--Any director shall have the
right to examine the corporation's stock ledger, a list of its stockholders and
its other books and records for a purpose reasonably related to the person's
position as a director.

                      SECTION 8.06. Amendment of By-laws.--These By-laws may be
altered, amended or repealed or new By-laws may be adopted either (a) by vote of
the stockholders at a duly organized annual or special meeting of stockholders
in accordance with the certificate of incorporation, or (b) by vote of
two-thirds of the entire board of directors at any regular or special meeting of
directors if such power is conferred upon the board of directors by the
certificate of incorporation.


                                     PAGE 27

<PAGE>   1
                                                                      EXHBIT 4.4








                           CMAC INVESTMENT CORPORATION

                                       and

                              THE BANK OF NEW YORK,

                                 as Rights Agent







                              AMENDED AND RESTATED
                                RIGHTS AGREEMENT

                          Dated as of January 19, 1999
<PAGE>   2
                                TABLE OF CONTENTS

Section                                                                     Page

1.  Certain Definitions........................................................2

2.  Appointment of Rights Agent................................................5

3.  Issue of Rights Certificates...............................................5

4.  Form of Rights Certificates................................................7

5.  Countersignature and Registration..........................................8

6.  Transfer, Split Up, Combination and Exchange of Rights Certificates; 
    Mutilated, Destroyed, Lost or Stolen Rights Certificates...................9

7.  Exercise of Rights; Purchase Price; Expiration Date of Rights.............10

8.  Cancellation and Destruction of Rights Certificates.......................12

9.  Reservation and Availability of Capital Stock; Registration of 
    Securities................................................................12

10. Capital Stock Record Date.................................................14

11. Adjustment of Purchase Price, Number and Kind of Shares or Number of 
    Rights....................................................................14

12. Certificate of Adjusted Purchase Price or Number of Shares................24

13. Consolidation, Merger or Sale or Transfer of Assets or Earning Power......25

14. Fractional Rights and Fractional Shares...................................28

15. Rights of Action..........................................................29

16. Agreement of Rights Holders...............................................29

17. Rights Certificate Holder Not Deemed a Stockholder........................30

18. Concerning the Rights Agent...............................................31

19. Merger or Consolidation or Change of Name of Rights Agent.................31
<PAGE>   3
20. Duties of Rights Agent....................................................32

21. Change of Rights Agent....................................................34

22. Issuance of New Rights Certificates.......................................35

23. Redemption and Termination................................................35

24. Exchange..................................................................36

25. Notice of Certain Events..................................................38

26. Notices...................................................................38

27. Supplements and Amendments................................................39

28. Successors................................................................40

29. Determinations and Actions by the Board of Directors, etc. ...............40

30. Benefits of this Agreement................................................41

31. Severability..............................................................41

32. Governing Law.............................................................41

33. Counterparts..............................................................42

34. Descriptive Headings......................................................42



Exhibit A   Resolution of the Board of Directors with respect to Series A Junior
            Participating Preferred Shares

Exhibit B   Form of Rights Certificate

Exhibit C   Summary of Shareholder Rights Plan
<PAGE>   4
                              AMENDED AND RESTATED
                                RIGHTS AGREEMENT


            AMENDED AND RESTATED RIGHTS AGREEMENT, dated as of January 19, 1999
(the "Agreement"), between CMAC INVESTMENT CORPORATION, a Delaware corporation
(the "Company"), and THE BANK OF NEW YORK, a New York banking corporation (the
"Rights Agent").


                               W I T N E S S E T H

            WHEREAS, on April 14, 1998 (the "Rights Dividend Declaration Date"),
the Board of Directors of the Company authorized and declared a dividend
distribution of one Right for each Common Share (as hereinafter defined) of the
Company outstanding at the close of business on May 5, 1998 (the "Record Date")
(which for these purposes shall include all Common Shares presently entitled to
receive dividends) and has authorized the issuance of one Right (as such number
may hereafter be adjusted pursuant to the provisions of Section 11(i) hereof)
for each Common Share of the Company issued between the Record Date (whether
originally issued or delivered from the Company's treasury) and the earlier of
the Distribution Date or the Expiration Date (as such terms are hereinafter
defined), each Right initially representing the right to purchase one
one-thousandth of a Preferred Share (as hereinafter defined) of the Company
having the rights, powers and preferences set forth in the form of the
Resolution of the Board of Directors attached hereto as Exhibit A, upon the
terms and subject to the conditions hereinafter set forth (the "Rights");

            WHEREAS, the Board of Directors of the Company has considered
whether approval of this Agreement and the distribution of the Rights is in the
best interests of the Company and all other pertinent factors;

            WHEREAS, the Board of Directors of the Company has concluded that
approval of this Agreement and the distribution of the Rights is in the best
interests of the Company because the existence of the Rights will help (i)
reduce the risk of coercive two-tiered, front-end loaded or partial offers that
may not offer fair value to all stockholders, (ii) mitigate against market
accumulators who through open market and/or private purchases may achieve a
position of substantial influence or control without paying to selling or
remaining stockholders a fair control premium, (iii) deter market accumulators
who are simply interested in putting the Company into "play," (iv) restrict
self-dealing by a substantial stockholder, and (v) preserve the Board of
Directors' bargaining power and flexibility to deal with third-party acquirors,
to pursue the business strategies of the Company and to otherwise seek to
maximize values for all stockholders; and

            WHEREAS, pursuant to Section 27 of the Agreement, the Company and
the Rights Agent may from time to time supplement or amend any provision of the
Agreement in accordance with the terms of such Section 27; and
<PAGE>   5
            WHEREAS, on January 19, 1999, the Board of Directors of the Company
authorized and approved the amendment and restatement of this Agreement as set
forth herein, all acts and things necessary to amend and restate the Agreement
have been done and performed, and the execution and delivery of the Agreement by
the Company and the Rights Agent have been in all respects duly authorized by
the Company and the Rights Agent.

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

            SECTION 1. Certain Definitions. For purposes of this Agreement, the
following terms have the meanings indicated:

            "Acquiring Person" shall mean any Person who or which, together with
all Affiliates and Associates of such Person, shall be the Beneficial Owner of
12% or more of the Common Shares then outstanding, but shall not include the
Company, any Subsidiary of the Company, any employee benefit plan of the Company
or of any Subsidiary of the Company, or any Person or entity organized,
appointed or established by the Company for or pursuant to the terms of any such
plan. Notwithstanding the foregoing, no Person shall become an "Acquiring
Person" as the result of an acquisition of Common Shares by the Company which,
by reducing the number of Common Shares outstanding, increases the proportionate
number of Common Shares beneficially owned by such Person to 12% or more of the
Common Shares then outstanding; provided, however, that if a Person shall become
the Beneficial Owner of 12% or more of the then outstanding Common Shares by
reason of Common Shares purchased by the Company and shall, after such share
purchases by the Company, become the Beneficial Owner of any additional Common
Shares, then such Person shall be deemed to be an "Acquiring Person."
Notwithstanding the foregoing, if a majority of the members of the Board of
Directors then in office determines in good faith that a Person who would
otherwise be an "Acquiring Person", as defined pursuant to the foregoing
provisions of this paragraph (a), has become such inadvertently, and such Person
divests as promptly as practicable a sufficient number of Common Shares so that
such Person would no longer be an Acquiring Person, as defined pursuant to the
foregoing provisions of this paragraph (a), then such Person shall not be deemed
to be an "Acquiring Person" for purposes of this Agreement. Notwithstanding the
foregoing, an Exempted Person, for so long as such Person remains an Exempted
Person, shall not be deemed to be an Acquiring Person for the purposes hereof.


            "Act" shall mean the Securities Act of 1933, as amended.

            "Adjustment Shares" shall have the meaning set forth in Section
11(a)(ii) of this Agreement.


                                      - 2 -
<PAGE>   6
            "Affiliate" and "Associate" shall have the respective meanings
ascribed to such terms in Rule 12b-2 of the General Rules and Regulations under
the Exchange Act.

            A Person shall be deemed the "Beneficial Owner" of, and shall be
deemed to "beneficially own," any securities:

                  (i) that such Person or any of such Person's Affiliates or
      Associates, directly or indirectly, has the right to acquire (whether such
      right is exercisable immediately or only after the passage of time)
      pursuant to any agreement, arrangement or understanding (whether or not in
      writing) or upon the exercise of conversion rights, exchange rights,
      rights, warrants or options, or otherwise; provided, however, that a
      Person shall not be deemed the "Beneficial Owner" of, or to "beneficially
      own," (A) securities tendered pursuant to a tender or exchange offer made
      by such Person or any of such Person's Affiliates or Associates until such
      tendered securities are accepted for payment, purchase or exchange, or (B)
      securities issuable upon exercise of Rights at any time prior to the
      occurrence of a Triggering Event, or (C) securities issuable upon exercise
      of Rights from and after the occurrence of a Triggering Event which Rights
      were acquired by such Person or any of such Person's Affiliates or
      Associates prior to the Distribution Date or pursuant to Section 3(a) or
      Section 22 hereof (the "Original Rights") or pursuant to Section 11(i)
      hereof in connection with an adjustment made with respect to any Original
      Rights;

                  (ii) that such Person or any of such Person's Affiliates or
      Associates, directly or indirectly, has the right to vote or dispose of or
      has "beneficial ownership" of (as determined pursuant to Rule 13d-3 of the
      General Rules and Regulations under the Exchange Act), including without
      limitation pursuant to any agreement, arrangement or understanding
      (whether or not in writing); provided, however, that a Person shall not be
      deemed the "Beneficial Owner" of, or to "beneficially own," any security
      under this subparagraph (ii) as a result of an oral or written agreement,
      arrangement or understanding to vote such security if such agreement,
      arrangement or understanding: (A) arises solely from a revocable proxy
      given in response to a public proxy or consent solicitation made pursuant
      to, and in accordance with, the applicable provisions of the General Rules
      and Regulations under the Exchange Act, and (B) is not also then
      reportable by such Person on Schedule 13D under the Exchange Act (or any
      comparable or successor report); or

                  (iii) that are beneficially owned, directly or indirectly, by
      any other Person (or any Affiliate or Associate thereof) with which such
      Person (or any of such Person's Affiliates or Associates) has any
      agreement, arrangement or


                                      - 3 -
<PAGE>   7
      understanding (whether or not in writing), for the purpose of acquiring,
      holding, voting (except pursuant to a revocable proxy as described in the
      proviso to subparagraph (ii) of this paragraph (c)) or disposing of any
      voting securities of the Company,

provided, however, that nothing in this paragraph (c) shall cause a person
engaged in business as an underwriter of securities to be the "Beneficial Owner"
of, or to "beneficially own," any securities acquired through such Person's
participation in good faith in a firm commitment underwriting until the
expiration of forty (40) days after the date of such acquisition.

            "Business Day" shall mean any day other than a Saturday, Sunday or a
day on which banking institutions in the State of New Jersey, the Commonwealth
of Pennsylvania or the State of New York are authorized or obligated by law or
executive order to close.

            "Close of Business" on any given date shall mean 5:00 P.M.,
Philadelphia time, on such date; provided, however, that if such date is not a
Business Day it shall mean 5:00 P.M., Philadelphia time, on the next succeeding
Business Day.

            "Common Share" shall mean, when used with reference to the Company,
a share of common stock, par value $.001 per share, of the Company and, to the
extent that there are not a sufficient number of Common Shares authorized to
permit the full exercise of the Rights, shares of any other class or series of
the Company designated for such purpose containing terms substantially similar
to the terms of the Common Shares, except that "Common Share" when used with
reference to any Person other than the Company shall mean the shares of common
stock of such Person with the greatest voting power, or the equity securities or
other equity interest having power to control or direct the management, of such
Person.

            "Distribution Date" shall have the meaning set forth in Section 3
hereof.

            "Exchange Act" shall mean the Securities Exchange Act of 1934, as
amended and in effect on the date hereof.

            "Exempted Person" shall mean Morgan Stanley Dean Witter and Company,
unless and until such Person, together with its Affiliates and Associates,
becomes the Beneficial Owner of 15% or more of the Common Stock then
outstanding, in which event such Person shall immediately be deemed to be an an
Acquiring Person and no longer an Exempted Person. The purchaser, assignee or
transferee of the Common Stock of an Exempted Person shall not be deemed an
Exempted Person.

            "Expiration Date" shall have the meaning set forth in Section 7(a)
hereof.


                                      - 4 -
<PAGE>   8
            "Person" shall mean any individual, firm, corporation, partnership,
limited liability company or other entity.

            "Preferred Share" shall mean a share of Series A Junior
Participating Preferred Shares, par value $.001 per share, of the Company and,
to the extent that there are not a sufficient number of shares of Series A
Junior Participating Preferred Shares authorized to permit the full exercise of
the Rights, shares of any other series of Series Preferred Stock of the Company
designated for such purpose containing terms substantially similar to the terms
of the Series A Junior Participating Preferred Shares.

            "Preferred Share Fraction" shall mean one one-thousandth of a
Preferred Share.

            "Section 11(a)(ii) Event" shall mean any event described in Section
11(a)(ii) (A), (B) or (C) hereof.

            "Section 13 Event" shall mean any event described in clauses (x),
(y) or (z) of Section 13(a) hereof.

            "Stock Acquisition Date" shall mean the first date of public
announcement (which, for purposes of this definition, shall include, without
limitation, a report filed pursuant to Section 13(d) under the Exchange Act) by
the Company or an Acquiring Person that an Acquiring Person has become such.

            "Subsidiary" shall have the meaning ascribed to such term in Rule
12b-2 of the General Rules and Regulations under the Exchange Act.

            "Trading Day" shall have the meaning set forth in Section 11(d)(i)
hereof.

            "Triggering Event" shall mean any Section 11(a)(ii) Event or any
Section 13 Event.

            Unless otherwise specified, where reference is made in this
Agreement to sections of, and the General Rules and Regulations under, the
Exchange Act, such reference shall mean such sections and rules as amended from
time to time and any successor provisions thereto.

            SECTION 2. Appointment of Rights Agent. The Company hereby appoints
the Rights Agent to act as agent for the Company in accordance with the terms
and conditions hereof, and the Rights Agent hereby accepts such appointment. The
Company may from time to time appoint such Co-Rights Agents as it may deem
necessary or desirable.


                                      - 5 -
<PAGE>   9
            SECTION 3. Issue of Rights Certificates.

            (a) Until the earlier of (i) the Close of Business on the tenth
Business Day after a Stock Acquisition Date involving an Acquiring Person that
has become such in a transaction as to which the Board of Directors has not made
the determination referred to in Section 11(a)(ii)(B) hereof, or (ii) the Close
of Business on the tenth Business Day (or such later date as may be determined
by action of the Board of Directors prior to such time any Person becomes an
Acquiring Person) after the date that a tender or exchange offer by any Person
(other than the Company, any Subsidiary of the Company, any employee benefit
plan of the Company or of any Subsidiary of the Company, or any Person or entity
organized, appointed or established by the Company for or pursuant to the terms
of any such plan) is first published or sent or given within the meaning of Rule
14d-2(a) of the General Rules and Regulations under the Exchange Act, if upon
consummation thereof, such Person would be the Beneficial Owner of 12% or more
of the Common Shares then outstanding (the earlier of (i) and (ii) being herein
referred to as the "Distribution Date"), (x) beneficial interests in the Rights
will be evidenced (subject to the provisions of paragraph (b) of this Section 3)
by the certificates for the Common Shares registered in the names of the holders
of the Common Shares (which certificates for Common Shares shall be deemed also
to be certificates for beneficial interests in the Rights) and not by separate
certificates, and (y) the Rights and beneficial interests therein will be
transferable only in connection with the transfer of the underlying Common
Shares (including a transfer to the Company). The Company must promptly notify
the Rights Agent of such Distribution Date and request that its transfer agent
provide the Rights Agent with a list of the record holders of the Company's
Common Shares as of the close of business on the Distribution Date. As soon as
practicable after the Rights Agent receives such notice and list, the Rights
Agent will send to each record holder of the Common Shares as of the close of
business on the Distribution Date, at the address of such holder shown on the
records of the Company, one or more rights certificates, in substantially the
form of Exhibit B hereto (the "Rights Certificates"), evidencing one Right for
each Common Share so held, subject to adjustment as provided herein. In the
event that an adjustment in the number of Rights per Common Share has been made
pursuant to Section 11(p) hereof, at the time of distribution of the Rights
Certificates, the Company shall make the necessary and appropriate rounding
adjustments (in accordance with Section 14(a) hereof) so that Rights
Certificates representing only whole numbers of Rights are distributed and cash
is paid in lieu of any fractional Rights. As of and after the Distribution Date,
the Rights will be evidenced solely by such Rights Certificates.

            (b) As promptly as practicable following the Record Date, the
Company will send a copy of a Summary of Rights, in substantially the form
attached hereto as Exhibit C to each record holder of the Common Shares as of
the close of business on the Record Date, at the address of such holder shown on
the records of the Company. With respect to certificates for the Common Shares
outstanding as of the Record Date, until the Distribution Date, the registered
holders of the Common Shares shall also be the registered holders of the
beneficial interests in


                                      - 6 -
<PAGE>   10
the associated Rights. Until the earlier of the Distribution Date or the
Expiration Date (as such term is defined in Section 7 hereof), the transfer of
any certificates representing Common Shares in respect of which Rights have been
issued shall also constitute the transfer of the Rights associated with such
Common Shares.

            (c) Except as provided in Section 22 hereof, Rights shall be issued
in respect of all Common Shares that are issued (whether originally issued or
delivered from the Company's treasury) after the Record Date but prior to the
earlier of the Distribution Date or the Expiration Date. Certificates
representing such Common Shares and all certificates issued after the Record
Date upon the transfer of Common Shares outstanding on the Record Date shall
also be deemed to be certificates for beneficial interests in the associated
Rights, and shall bear the following legend:

            "This certificate also evidences a beneficial interest in and
      entitles the holder hereof to certain Rights as set forth in the Amended
      and Restated Rights Agreement between CMAC Investment Corporation (the
      "Company") and The Bank of New York, a national banking association (the
      "Rights Agent") dated as of January 19, 1999 (the "Rights Agreement"), and
      as the same may be amended from time to time, the terms of which are
      hereby incorporated herein by reference and a copy of which is on file at
      the principal offices of the Company. Under certain circumstances, as set
      forth in the Rights Agreement, such Rights will be evidenced by separate
      certificates and beneficial interests therein will no longer be evidenced
      by this certificate. The Company will mail to the holder of this
      certificate a copy of the Rights Agreement, as in effect on the date of
      mailing, without charge promptly after receipt of a written request
      therefor. Under certain circumstances set forth in the Rights Agreement,
      Rights issued to, or held by, any Person who is, was or becomes an
      Acquiring Person or any Affiliate or Associate thereof (as such terms are
      defined in the Rights Agreement), whether currently held by or on behalf
      of such Person or by any subsequent holder, may become null and void."

With respect to such certificates containing the foregoing legend, until the
earlier of (i) the Distribution Date or (ii) the Expiration Date, beneficial
interests in the Rights associated with the Common Shares represented by such
certificates shall be evidenced by such certificates alone and registered
holders of Common Shares shall also be the registered holders of beneficial
interests in the associated Rights, and the transfer of any of such certificates
shall also constitute the transfer of beneficial interests in the Rights
associated with the Common Shares represented by such certificates.


                                      - 7 -
<PAGE>   11
            SECTION 4. Form of Rights Certificates.

            (a) The Rights Certificates (and the forms of election to purchase
and of assignment to be printed on the reverse thereof) shall each be
substantially in the form set forth in Exhibit B hereto and may have such marks
of identification or designation and such legends, summaries or endorsements
printed thereon as the Company may deem appropriate (which do not affect the
duties or responsibilities of the Rights Agent) and as are not inconsistent with
the provisions of this Agreement, or as may be required to comply with any
applicable law or with any rule or regulation made pursuant thereto or with any
rule or regulation of any stock exchange or the NASDAQ Stock Market on which the
Rights may from time to time be listed, or to conform to usage. Subject to the
provisions of Section 11 and Section 22 hereof, the Rights Certificates,
whenever distributed, shall entitle the holders thereof to purchase such number
of Preferred Share Fractions as shall be set forth therein at the price set
forth therein (such exercise price per Preferred Share Fraction, the "Purchase
Price"), but the amount and type of securities purchasable upon the exercise of
each Right and the Purchase Price thereof shall be subject to adjustment as
provided herein.

            (b) Any Rights Certificate issued pursuant to Section 3(a) or
Section 22 hereof that represents Rights that the Company knows are beneficially
owned by: (i) an Acquiring Person or any Associate or Affiliate of an Acquiring
Person, (ii) a transferee of an Acquiring Person (or of any such Associate or
Affiliate) who becomes a transferee after the Acquiring Person becomes such, or
(iii) a transferee of an Acquiring Person (or of any such Associate or
Affiliate) who becomes a transferee prior to or concurrently with the Acquiring
Person becoming such and receives such Rights pursuant to either (A) a transfer
(whether or not for consideration) from the Acquiring Person to holders of
equity interests in such Acquiring Person or to any Person with whom such
Acquiring Person has any continuing oral or written plan, agreement, arrangement
or understanding regarding the transferred Rights or (B) a transfer that the
Board of Directors of the Company has determined is part of an oral or written
plan, agreement, arrangement or understanding that has as a primary purpose or
effect avoidance of Section 7(e) hereof, and provided that the Company shall
have notified the Rights Agent that this Section 4(b) applies, any Rights
Certificate issued pursuant to Section 6 or Section 11 hereof upon transfer,
exchange, replacement or adjustment of any other Rights Certificate referred to
in this sentence, shall contain (to the extent feasible) the following legend:

            "The Rights represented by this Rights Certificate are or were
            beneficially owned by a Person who was or became an Acquiring Person
            or an Affiliate or Associate of an Acquiring Person (as such terms
            are defined in the Rights Agreement). Accordingly, this Rights
            Certificate and the Rights represented hereby may become null and
            void in the circumstances specified in Section 7(e) of such
            Agreement."


                                      - 8 -
<PAGE>   12
            SECTION 5. Countersignature and Registration.

            (a) The Rights Certificates shall be executed on behalf of the
Company by its Chairman of the Board, its President or any Vice President,
either manually or by facsimile signature, and shall have affixed thereto the
Company's seal or a facsimile thereof which shall be attested by the Secretary
or an Assistant Secretary of the Company, either manually or by facsimile
signature. The Rights Certificates shall be manually countersigned by the Rights
Agent and shall not be valid for any purpose unless so countersigned. In case
any officer of the Company who shall have signed any of the Rights Certificates
shall cease to be such officer of the Company before countersignature by the
Rights Agent and issuance and delivery by the Company, such Rights Certificates,
nevertheless, may be countersigned by the Rights Agent and issued and delivered
by the Company with the same force and effect as though the Person who signed
such Rights Certificates had not ceased to be such officer of the Company; and
any Rights Certificates may be signed on behalf of the Company by any Person
who, at the actual date of the execution of such Rights Certificate, shall be a
proper officer of the Company to sign such Rights Certificate, although at the
date of the execution of this Agreement any such Person was not such an officer.

            (b) Following the Distribution Date and upon receipt by the Rights
Agent of the notice and list of recordholders of the Rights referred to in
Section 3(a), the Rights Agent will keep or cause to be kept, at its office or
offices designated pursuant to Section 25 hereof, books for registration and
transfer of the Rights Certificates issued hereunder. Such books shall show the
names and addresses of the respective holders of the Rights Certificates, the
number of Rights evidenced on its face by each of the Rights Certificates, the
Certificate number and the date of each of the Rights Certificates.

            SECTION 6. Transfer, Split Up, Combination and Exchange of Rights
Certificates; Mutilated, Destroyed, Lost or Stolen Rights Certificates.

            (a) Subject to the provisions of Section 4(b), Section 7(e) and
Section 14 hereof, at any time after the Close of Business on the Distribution
Date, and at or prior to the Close of Business on the Expiration Date, any
Rights Certificate or Certificates may be transferred, split up, combined or
exchanged for another Rights Certificate or Certificates, entitling the
registered holder to purchase a like number of Preferred Share Fractions (or,
following a Triggering Event, Common Shares or other securities, cash or other
assets, as the case may be), as the Rights Certificate or Certificates
surrendered then entitled such holder or former holder in the case of a transfer
to purchase. Any registered holder desiring to transfer, split up, combine or
exchange any Rights Certificate or Certificates shall make such request in
writing delivered to the Rights Agent, and shall surrender the Rights
Certificate or Certificates to be transferred, split up, combined or exchanged
at the office of the Rights Agent designated for


                                      - 9 -
<PAGE>   13
such purpose. Neither the Rights Agent nor the Company shall be obligated to
take any action whatsoever with respect to the transfer of any such surrendered
Rights Certificate or Certificates until the registered holder shall have
completed and signed the certificate contained in the form of assignment on the
reverse side of such Rights Certificate and shall have provided such additional
evidence of the identity of the Beneficial Owner (or former Beneficial Owner) or
Affiliates or Associates thereof as the Company or the Rights Agent shall
reasonably request. Thereupon the Rights Agent shall, subject to Section 4(b),
Section 7(e) and Section 14 hereof, countersign and deliver to the Person
entitled thereto a Rights Certificate or Rights Certificates, as the case may
be, as so requested. The Rights Agent shall not be obligated to process the
transaction until it has received evidence that all taxes and charges arising
from the transaction have been paid. The Company may require payment of a sum
sufficient to cover any tax or governmental charge that may be imposed in
connection with any transfer, split up, combination or exchange of Rights
Certificates.

            (b) Upon receipt by the Company and the Rights Agent of evidence
reasonably satisfactory to them of the loss, theft, destruction or mutilation of
a Rights Certificate, and, in case of loss, theft or destruction, of indemnity
or security satisfactory to them, and reimbursement to the Company and the
Rights Agent of all reasonable expenses incidental thereto, and upon surrender
to the Rights Agent and cancellation of the Rights Certificate if mutilated, the
Company will execute and deliver a new Rights Certificate of like tenor to the
Rights Agent for countersignature and delivery to the registered owner in lieu
of the Rights Certificate so lost, stolen, destroyed or mutilated.

            SECTION 7. Exercise of Rights; Purchase Price; Expiration Date of
Rights.

            (a) Subject to subsection (e), the registered holder of any Rights
Certificate may exercise the Rights evidenced thereby (except as otherwise
provided herein including, without limitation, the restrictions on
exercisability set forth in Section 9(c), Section 11(a)(iii) and Section 23(a)
hereof) in whole or in part at any time after the Distribution Date upon
surrender of the Rights Certificate, with the form of election to purchase and
the certificate on the reverse side thereof duly executed, to the Rights Agent
at the office of the Rights Agent designated for such purpose, together with
payment of the aggregate Purchase Price (except as provided in Section 11(q)
hereof) with respect to the total number of Preferred Share Fractions (or Common
Shares, other securities, cash or other assets, as the case may be) as to which
such surrendered Rights are then exercisable (except as provided in Section
11(q) hereof), at or prior to the earliest of (i) the Close of Business on May
5, 2008 (the "Final Expiration Date"), (ii) the consummation of a transaction
contemplated by Section 13(d) hereof, or (iii) the time at which the Rights are
redeemed or terminated as provided in Section 23 hereof (the earliest of (i),
(ii) and (iii) being herein referred to as the "Expiration Date").


                                     - 10 -
<PAGE>   14
            (b) The Purchase Price for each Preferred Share Fraction pursuant to
the exercise of a Right shall initially be $300, provided in Sections 11 and
13(a) hereof and shall be payable in accordance with subsection (c).

            (c) Upon receipt of a Rights Certificate representing exercisable
Rights, with the form of election to purchase and the certificate duly executed,
accompanied by payment, with respect to each Right so exercised, of the Purchase
Price per Preferred Share Fraction (or Common Shares, other securities, cash or
other assets, as the case may be) to be purchased as set forth below and an
amount equal to any applicable tax or governmental charge, the Rights Agent
shall, subject to Section 20(k) and Section 14(b) hereof, thereupon promptly (i)
(A) requisition from any transfer agent of the Preferred Shares (or make
available, if the Rights Agent is the transfer agent for the Common Shares)
certificates for the total number of Preferred Shares to be purchased and the
Company hereby irrevocably authorizes its transfer agent to comply with all such
requests, or (B) if the Company shall have elected to deposit some or all of the
total number of Preferred Shares issuable upon exercise of the Rights hereunder
with a depositary agent, requisition from the depositary agent depositary
receipts representing such number of Preferred Share Fractions as are to be
purchased (in which case certificates for the Preferred Shares represented by
such receipts shall be deposited by the transfer agent with the depositary
agent) and the Company will direct the depositary agent to comply with such
request, (ii) requisition from the Company the amount of cash, if any, to be
paid in lieu of fractional shares in accordance with Section 14 hereof, (iii)
after receipt of such certificates or depositary receipts, cause the same to be
delivered to or upon the order of the registered holder of such Rights
Certificate, registered in such name or names as may be designated by such
holder, and (iv) after receipt thereof, deliver such cash, if any, to or upon
the order of the registered holder of such Rights Certificate. The payment of
the Purchase Price (as such amount may be reduced pursuant to Section 11(a)(iii)
hereof) may be made, at the election of the holder of the Rights Certificate,
(x) in cash or by certified bank check or money order payable to the order of
the Company or (y) by delivery of Rights if and to the extent authorized by
Section 11(q) hereof. In the event that the Company is obligated to issue other
securities of the Company (including Common Shares) pay cash and/or distribute
other property pursuant to Section 11(a) hereof, the Company will make all
arrangements necessary so that such other securities, cash and/or other property
are available for distribution by the Rights Agent, if and when necessary to
comply with this agreement.

            (d) In case the registered holder of any Rights Certificate shall
exercise less than all the Rights evidenced thereby, a new Rights Certificate
evidencing Rights equivalent to the Rights remaining unexercised shall be issued
by the Rights Agent and delivered to, or upon the order of, the registered
holder of such Rights Certificate, registered in such name or names as may be
designated by such holder, subject to the provisions of Section 6 and Section 14
hereof.


                                     - 11 -
<PAGE>   15
            (e) Notwithstanding anything in this Agreement to the contrary, from
and after the first occurrence of a Section 11(a)(ii) Event, any Rights
beneficially owned by (i) an Acquiring Person or an Associate or Affiliate of an
Acquiring Person, (ii) a transferee of an Acquiring Person (or of any such
Associate or Affiliate) who becomes a transferee after the Acquiring Person
becomes such, or (iii) a transferee of an Acquiring Person (or of any such
Associate or Affiliate) who becomes a transferee prior to or concurrently with
the Acquiring Person becoming such and receives such Rights pursuant to either
(A) a transfer (whether or not for consideration) from the Acquiring Person to
holders of equity interests in such Acquiring Person or to any Person with whom
the Acquiring Person has any continuing oral or written plan, agreement,
arrangement or understanding regarding the transferred Rights or (B) a transfer
which the Board of Directors of the Company has determined is part of an oral or
written plan, agreement, arrangement or understanding which has as a primary
purpose or effect the avoidance of this Section 7(e), shall become null and void
without any further action and no holder of such Rights shall have any rights
whatsoever with respect to such Rights, whether under any provision of this
Agreement or otherwise; provided, however, that the Rights held by an Acquiring
Person, an Affiliate or Associate of an Acquiring Person or the transferees of
such persons referred to above shall not be voided unless the Acquiring Person
in question or an Affiliate or Associate of such Acquiring Person shall be
involved in the transaction giving rise to the Section 11(a)(ii) Event. The
Company shall notify the Rights Agent when this Section 7(e) applies and shall
use all reasonable efforts to insure that the provisions of this Section 7(e)
and Section 4(b) hereof are complied with, but neither the Company nor the
Rights Agent shall have any liability to any holder of Rights Certificates or
other Person as a result of the Company's failure to make any determinations
with respect to an Acquiring Person or its Affiliates, Associates or transferees
hereunder.

            (f) Notwithstanding anything in this Agreement to the contrary,
neither the Rights Agent nor the Company shall be obligated to undertake any
action with respect to a registered holder upon the occurrence of any purported
exercise as set forth in this Section 7 unless such registered holder shall have
(i) properly completed and signed the certificate contained in the form of
election to purchase set forth on the reverse side of the Rights Certificate
surrendered for such exercise, and (ii) provided such additional evidence of the
identity of the Beneficial Owner (or former Beneficial Owner) or Affiliates or
Associates thereof as the Company shall or the Rights Agent reasonably request.

            SECTION 8. Cancellation and Destruction of Rights Certificates. All
Rights Certificates surrendered for the purpose of exercise, transfer, split up,
combination or exchange shall, if surrendered to the Company or any of its
agents, be delivered to the Rights Agent for cancellation or in canceled form,
or, if surrendered to the Rights Agent, shall be canceled by it, and no Rights
Certificates shall be issued in lieu thereof except as expressly permitted by
any of the provisions of this Agreement. The Company shall deliver to the Rights
Agent for cancellation and retirement, and the Rights Agent shall so cancel and
retire, any other Rights


                                     - 12 -
<PAGE>   16
Certificate purchased or acquired by the Company otherwise than upon the
exercise thereof. The Rights Agent shall deliver all canceled Rights
Certificates to the Company, or shall, at the written request of the Company,
destroy such canceled Rights Certificates, and in such case shall deliver a
certificate of destruction thereof to the Company.

            SECTION 9. Reservation and Availability of Capital Stock;
Registration of Securities.

            (a) The Company covenants and agrees that it will cause to be
reserved and kept available for issuance upon the exercise of outstanding Rights
as many of its authorized and unissued Preferred Shares (and, following the
occurrence of a Triggering Event, out of its authorized and unissued or treasury
Common Shares and/or other securities) or out of its authorized and issued
shares held in its treasury, which together, shall at all times after the
Distribution Date be sufficient to permit the exercise in full of all
outstanding Rights.

            (b) So long as the Preferred Shares (and, following the occurrence
of a Triggering Event, Common Shares or other securities) issuable and
deliverable upon the exercise of the Rights may be listed on any stock exchange,
or quoted on the NASDAQ Stock Market, the Company shall use its best efforts to
cause, from and after such time as the Rights become exercisable, all shares and
other securities reserved for such issuance to be listed on such exchange upon
official notice of issuance upon such exercise.

            (c) The Company shall use its best efforts to (i) file, as soon as
practicable following the earliest date after the first occurrence of a Section
11(a)(ii) Event on which the consideration to be delivered by the Company upon
exercise of the Rights has been determined in accordance with Section 11(a)(iii)
hereof, or as soon as is required by law following the Distribution Date, as the
case may be, a registration statement or statements under the Act, with respect
to the securities purchasable upon exercise of the Rights on an appropriate form
or forms, (ii) cause such registration statement or statements to become
effective as soon as practicable after such filing, and (iii) cause such
registration statement or statements to remain effective (with a prospectus at
all times meeting the requirements of the Act) until the earlier of (A) the date
as of which the Rights are no longer exercisable for such securities, and (B)
the Expiration Date. The Company will also take such action as may be
appropriate under, or to ensure compliance with, the securities or "blue sky"
laws of the various states in connection with the exercisability of the Rights.
The Company may temporarily suspend, for a period of time not to exceed ninety
(90) days after the date set forth in clause (i) of the first sentence of this
subsection (c), the exercisability of the Rights in order to prepare and file
such registration statement and permit it to become effective. Upon any such
suspension, the Company shall issue a public announcement stating that the
exercisability of the Rights has been temporarily suspended, as well as a public
announcement at such time as the suspension is no longer in effect. In addition,
if the Company shall determine that a registration statement is required 
following the 


                                     - 13 -
<PAGE>   17
Distribution Date, the Company may, by issuing a public announcement,
temporarily suspend the exercisability of the Rights until such time as a
registration statement has been declared effective. The Company shall notify the
Rights Agent whenever it makes a public announcement pursuant to this subsection
(c) and give the Rights Agent a copy of the announcement. Notwithstanding any
provision of this Agreement to the contrary, the Rights shall not be exercisable
in any jurisdiction unless the requisite qualification in such jurisdiction
shall have been obtained, nor shall the Rights be exercisable if the exercise
thereof shall not be permitted under applicable law or a registration statement
shall not have been declared effective.

            (d) The Company covenants and agrees that it will take all such
action as may be necessary to ensure that all Preferred Shares (and, following a
Triggering Event, Common Shares or other securities) delivered upon exercise of
Rights shall, at the time of delivery of the certificates for such shares or
other securities (subject to payment of the Purchase Price), be duly and validly
authorized and issued and, with respect to Preferred Shares, Common Shares or
other shares of capital stock, fully paid and nonassessable.

            (e) The Company further covenants and agrees that it will pay when
due and payable any and all taxes and governmental charges that may be payable
in respect of the issuance or delivery of the Rights Certificates and of any
certificates for a number of Preferred Share Fractions (or Common Shares or
other securities, as the case may be) upon the exercise of Rights. The Company
shall not, however, be required to pay any transfer tax that may be payable in
respect of any transfer or delivery of Rights Certificates to a Person other
than, or the issuance or delivery of a number of Preferred Share Fractions (or
Common Shares or other securities, as the case may be) in respect of a name
other than that of the registered holder of the Rights Certificates evidencing
Rights surrendered for exercise or to issue or deliver any certificates for a
number of Preferred Share Fractions (or Common Shares or other securities, as
the case may be) in a name other than that of the registered holder upon the
exercise of any Rights until such tax shall have been paid (any such tax being
payable by the holder of such Rights Certificate at the time of surrender) or
until it has been established to the Company's satisfaction that no such tax is
due.

            SECTION 10. Capital Stock Record Date. Each Person in whose name any
certificate for a number of Preferred Share Fractions (or Common Shares or other
securities, as the case may be) is issued upon the exercise of Rights shall for
all purposes be deemed to have become the holder of record of such Preferred
Share Fractions (or Common Shares or other securities, as the case may be)
represented thereby on, and such certificate shall be dated, the date upon which
the Rights Certificate evidencing such Rights was duly surrendered and payment
of the Purchase Price (and all applicable taxes and governmental charges) was
made; provided, however, that if the date of such surrender and payment is a
date upon which the applicable transfer books of the Company are closed, such
Person shall be deemed to have become the record holder of such shares
(fractional or otherwise) on, and such certificate shall be dated, the 


                                     - 14 -
<PAGE>   18
next succeeding Business Day on which the applicable transfer books of the
Company are open. Prior to the exercise of the Rights evidenced thereby, the
holder of a Rights Certificate shall not be entitled to any rights of a
stockholder of the Company with respect to shares for which the Rights shall be
exercisable, including, without limitation, the right to vote, to receive
dividends or other distributions or to exercise any preemptive rights, and shall
not be entitled to receive any notice of any proceedings of the Company, except
as provided herein.

            SECTION 11. Adjustment of Purchase Price, Number and Kind of Shares
or Number of Rights. The Purchase Price, the number and kind of shares and other
securities covered by each Right and the number of Rights issued (or to be
issued) and outstanding are subject to adjustment from time to time as provided
in this Section 11.

            (a) (i) In the event the Company shall at any time after the date of
this Agreement (A) declare a dividend on any security of the Company payable in
Preferred Shares, (B) subdivide the outstanding Preferred Shares, (C) combine
the outstanding Preferred Shares into a smaller number of shares, or (D) issue
any shares of its capital stock in a reclassification of the Preferred Shares
(including any such reclassification in connection with a consolidation or
merger in which the Company is the continuing or surviving corporation), except
as otherwise provided in this Section 11(a) and Section 7(e) hereof, the
Purchase Price in effect at the time of the record date for such dividend or of
the effective date of such subdivision, combination or reclassification, and the
number and kind of Preferred Shares or capital stock, as the case may be,
issuable on such date, shall be proportionately adjusted so that the holder of
any Right exercised after such time shall be entitled to receive, upon payment
of the adjusted Purchase Price, the aggregate number and kind of Preferred
Shares or capital stock, as the case may be, that, if such Right had been
exercised immediately prior to such date and at a time when the Preferred Share
transfer books were open, such holder would have owned upon such exercise and
been entitled to receive by virtue of such dividend, subdivision, combination or
reclassification. If an event occurs which would require an adjustment under
both this Section 11(a)(i) and Section 11(a)(ii) hereof, the adjustment provided
for in this Section 11(a)(i) shall be in addition to, and shall be made prior
to, any adjustment required pursuant to Section 11(a)(ii) hereof.

                  (ii) In the event:

                        (A) any Acquiring Person or any Associate or Affiliate 
            of any Acquiring Person, at any time after the Stock Acquisition 
            Date, directly or indirectly, (1) shall merge into the Company or
            otherwise combine with the Company and the Company shall be the
            continuing or surviving corporation of such merger or combination
            and the Common Shares of the Company or other equity securities of
            the Company shall remain outstanding, (2) shall, in one transaction
            or a series of transactions, transfer any assets to the Company or
            to any of its Subsidiaries in exchange (in whole or in part) for
            Common Shares, for


                                     - 15 -
<PAGE>   19
            shares of other equity securities of the Company, or for securities
            exercisable for or convertible into shares of equity securities of
            the Company (Common Shares or otherwise) or otherwise obtain from
            the Company, with or without consideration, any additional shares of
            such equity securities or securities exercisable for or convertible
            into shares of such equity securities (other than pursuant to a pro
            rata distribution to all holders of Common Shares), (3) shall sell,
            purchase, lease, exchange, mortgage, pledge, transfer or otherwise
            acquire or dispose of assets in one transaction or a series of
            transactions, to, from or with (as the case may be) the Company or
            any of its Subsidiaries, on terms and conditions less favorable to
            the Company than the Company would be able to obtain in arm's-length
            negotiation with an unaffiliated third party, other than pursuant to
            a Section 13 Event, (4) shall sell, purchase, lease, exchange,
            mortgage, pledge, transfer or otherwise dispose of assets having an
            aggregate fair market value of more than $5,000,000 in one
            transaction or a series of transactions, to, from or with (as the
            case may be) the Company or any of the Company's Subsidiaries (other
            than incidental to the lines of business, if any, engaged in as of
            the date hereof between the Company and such Acquiring Person or
            Associate or Affiliate), other than pursuant to a Section 13 Event,
            (5) shall receive any compensation from the Company or any of the
            Company's Subsidiaries other than compensation for full-time
            employment as a regular employee at rates in accordance with the
            Company's (or its Subsidiaries') past practices, or (6) shall
            receive the benefit, directly or indirectly (except proportionately
            as a stockholder and except if resulting from a requirement of law
            or governmental regulation), of any loans, advances, guarantees,
            pledges or other financial assistance or any tax credits or other
            tax advantages provided by the Company or any of its Subsidiaries;
            or

                        (B) any Person (other than the Company, any Subsidiary
            of the Company, any employee benefit plan of the Company or of any
            Subsidiary of the Company, any Person or entity organized, appointed
            or established by the Company for or pursuant to the terms of any
            such plan or an Exempted Person, for so long as such Person remains
            an Exempted Person), alone or together with its Affiliates and
            Associates, shall, at any time after the Rights Dividend Declaration
            Date, become the Beneficial Owner of 12% or more of the Common
            Shares then outstanding, unless the event causing the 12% threshold
            to be crossed is a Section 13 Event, or is an acquisition of Common
            Shares pursuant to a tender offer or an exchange offer for all
            outstanding Common Shares at a price and on terms determined by at
            least a majority of the members of the Board of Directors, after
            receiving advice from one or more nationally recognized investment
            banking firms, to be in the best interests of the Company and its
            stockholders (a "Qualifying Offer"), after taking into consideration
            all factors that such members of the Board of Directors deem
            relevant, including, without limitation, the long-


                                     - 16 -
<PAGE>   20
            term prospects and value of the Company and the prices and terms
            that such members of the Board of Directors believe, in good faith,
            could reasonably be achieved if the Company or its assets were sold
            on an orderly basis designed to realize maximum value, or

                        (C) during such time as there is an Acquiring Person,
            there shall be any reclassification of securities (including any
            reverse stock split), or recapitalization of the Company, or any
            merger or consolidation of the Company with any of its Subsidiaries
            or any other transaction or series of transactions involving the
            Company or any of its Subsidiaries, other than a Section 13 Event or
            series of such Section 13 Events (whether or not with or into or
            otherwise involving an Acquiring Person) that has the effect,
            directly or indirectly, of increasing by more than 1% the
            proportionate share of the outstanding shares of any class of equity
            securities of the Company or any of its Subsidiaries that is
            directly or indirectly beneficially owned by any Acquiring Person or
            any Associate or Affiliate of any Acquiring Person,

      then, promptly following the first occurrence of a Section 11(a)(ii)
      Event, proper provision shall be made so that each holder of a Right
      (except as provided below and in Section 7(e) hereof) shall thereafter
      have the right to receive, upon exercise thereof at the then current
      Purchase Price in accordance with the terms of this Agreement, in lieu of
      a number of Preferred Share Fractions, such number of Common Shares of the
      Company as shall equal the result obtained by (x) multiplying the then
      current Purchase Price by the then number of Preferred Share Fractions for
      which a Right was exercisable immediately prior to the first occurrence of
      a Section 11(a)(ii) Event, and (y) dividing that product (which, following
      such first occurrence, shall thereafter be referred to as the "Purchase
      Price" for each Right and for all purposes of this Agreement) by 50% of
      the current market price (as defined in and determined pursuant to Section
      11(d) hereof) per Common Share on the date of such first occurrence (such
      number of shares, the "Adjustment Shares").

                  (iii) In the event that the number of Common Shares that are
      authorized by the Company's Certificate of Incorporation but not
      outstanding or reserved for issuance for purposes other than upon exercise
      of the Rights are not sufficient to permit the exercise in full of the
      Rights in accordance with the foregoing subparagraph (ii) of this Section
      11(a), the Company shall: (A) determine the excess of the value of the
      Adjustment Shares issuable upon the exercise of a Right (the "Current
      Value") over the Purchase Price (such excess, the "Spread"), and (B) with
      respect to each Right, make adequate provision to substitute for the
      Adjustment Shares, upon payment of the applicable Purchase Price, (1)
      cash, (2) a reduction in the Purchase Price, (3) Common Shares of the same
      or a different class or other equity securities of the Company


                                     - 17 -
<PAGE>   21
      (including, without limitation, preferred shares or units of preferred
      shares that a majority of the members of the Board of Directors in office
      at the time has deemed (based, among other things, on the dividend and
      liquidation rights of such preferred shares) to have substantially the
      same economic value as Common Shares (such preferred shares, hereinafter
      referred to as "common share equivalents")), (4) debt securities of the
      Company, (5) other assets, or (6) any combination of the foregoing, having
      an aggregate value equal to the Current Value, where such aggregate value
      has been determined by a majority of the members of the Board of Directors
      in office at the time after considering the advice of a nationally
      recognized investment banking firm selected by the Board of Directors of
      the Company; provided, however, if the Company shall not have made
      adequate provision to deliver value pursuant to clause (B) above within
      thirty (30) days following the later of (x) the first occurrence of a
      Section 11(a)(ii) Event and (y) the date on which the Company's right of
      redemption pursuant to Section 23(a) expires (the later of (x) and (y)
      being referred to herein as the "Section 11(a)(ii) Trigger Date"), then
      the Company shall be obligated to deliver, upon the surrender for exercise
      of a Right and without requiring payment of the Purchase Price, Common
      Shares (to the extent available) and then, if necessary, cash, which
      shares and/or cash have an aggregate value equal to the Spread. If the
      Board of Directors of the Company shall determine in good faith that it is
      likely that sufficient additional Common Shares could be authorized for
      issuance upon exercise in full of the Rights, the thirty (30) day period
      set forth above may be extended to the extent necessary, but not more than
      ninety (90) days after the Section 11(a)(ii) Trigger Date, in order that
      the Company may seek stockholder approval for the authorization of such
      additional shares (such period, as it may be extended, the "Substitution
      Period"). To the extent that the Company determines that some action need
      be taken pursuant to the first and/or second sentences of this Section
      11(a)(iii), the Company shall provide, subject to Section 7(e) hereof,
      that such action shall apply uniformly to all outstanding Rights, and may
      suspend the exercisability of the Rights until the expiration of the
      Substitution Period in order to seek any authorization of additional
      shares and/or to decide the appropriate form of distribution to be made
      pursuant to such first sentence and to determine the value thereof. The
      Company shall make a public announcement when the exercisability of the
      Rights has been temporarily suspended, and again when such suspension is
      no longer in effect. The Company shall notify the Rights Agent of the
      suspension of the exercisability of the Rights, and provide the Rights
      Agent with a copy of such public announcement. For purposes of this
      Section 11(a)(iii), the value of the Common Shares shall be the current
      market price (as determined pursuant to Section 11(d) hereof) per Common
      Share on the Section 11(a)(ii) Trigger Date and the value of any "common
      share equivalent" shall be deemed to have the same value as the Common
      Shares on such date.

            (b) In case the Company shall fix a record date for the issuance of
rights, options or warrants to holders of any security of the Company entitling 
them to subscribe for or


                                     - 18 -
<PAGE>   22
purchase (for a period expiring within forty-five (45) calendar days after such
record date) Preferred Shares (or shares having the same rights, privileges and
preferences as the Preferred Shares ("equivalent preferred shares")) or
securities convertible into Preferred Shares or equivalent preferred shares at a
price per Preferred Share or per equivalent preferred share (or having a
conversion price per share, if a security convertible into Preferred Shares or
equivalent preferred shares) less than the current market price (as determined
pursuant to Section 11(d) hereof) per Preferred Share on such record date, the
Purchase Price to be in effect after such record date shall be determined by
multiplying the Purchase Price in effect immediately prior to such record date
by a fraction, the numerator of which shall be the number of Preferred Shares
outstanding on such record date, plus the number of Preferred Shares that the
aggregate offering price of the total number of Preferred Shares and/or
equivalent preferred shares so to be offered (and/or the aggregate initial
conversion price of the convertible securities so to be offered) would purchase
at such current market price, and the denominator of which shall be the number
of Preferred Shares outstanding on such record date, plus the number of
additional Preferred Shares and/or equivalent preferred shares to be offered for
subscription or purchase (or into which the convertible securities so to be
offered are initially convertible). In case such subscription price may be paid
by delivery of consideration part or all of which may be in a form other than
cash, the value of such consideration shall be as determined in good faith by
the Board of Directors of the Company, whose determination shall be described in
a statement filed with the Rights Agent and shall be binding on the Company, the
Rights Agent and the holders of the Rights. Preferred Shares owned by or held
for the account of the Company shall not be deemed outstanding for the purpose
of any such computation. Such adjustment shall be made successively whenever
such a record date is fixed, and in the event that such rights or warrants are
not so issued, the Purchase Price shall be adjusted to be the Purchase Price
that would then be in effect if such record date had not been fixed.

            (c) In case the Company shall fix a record date for a distribution
to all holders of Preferred Shares (including any such distribution made in
connection with a consolidation or merger in which the Company is the continuing
corporation) of evidences of indebtedness, cash (other than a regular quarterly
dividend out of the earnings or retained earnings of the Company), assets (other
than a regular quarterly dividend referred to above or dividend payable in
Preferred Shares, but including any dividend payable in stock other than
Preferred Shares) or subscription rights or warrants (excluding those referred
to in Section 11(b) hereof), the Purchase Price to be in effect after such
record date shall be determined by multiplying the Purchase Price in effect
immediately prior to such record date by a fraction, the numerator of which
shall be the current market price (as determined pursuant to Section 11(d)
hereof) per Preferred Share on such record date, less the then fair market value
(as determined in good faith by the Board of Directors of the Company, whose
determination shall be described in a statement filed with the Rights Agent and
shall be conclusive for all purposes) of the portion of the cash, assets or
evidences of indebtedness so to be distributed or of such subscription rights or
warrants applicable to a Preferred Share and the denominator of which shall be
such current market price (as determined


                                     - 19 -
<PAGE>   23
pursuant to Section 11(d) hereof) per Preferred Share. Such adjustments shall be
made successively whenever such a record date is fixed, and in the event that
such distribution is not so made, the Purchase Price shall be adjusted to be the
Purchase Price which would have been in effect if such record date had not been
fixed.

            (d) (i) For the purpose of any computation hereunder, other than
computations made pursuant to Section 11(a)(iii) hereof, the "current market
price" per Common Share on any date shall be deemed to be the average of the
daily closing prices per Common Share for the thirty (30) consecutive Trading
Days (as such term is hereinafter defined) immediately prior to and not
including such date, and for purposes of computations made pursuant to Section
11(a)(iii) hereof, the "current market price" per Common Share on any date shall
be deemed to be the average of the daily closing prices per Common Share for the
ten (10) consecutive Trading Days immediately following and not including such
date; provided, however, that in the event that the current market price per
Common Share is determined during a period following the announcement by the
issuer of such Common Share of (A) a dividend or distribution on such Common
Share payable in Common Shares or securities convertible into Common Shares
(other than the Rights), or (B) any subdivision, combination or reclassification
of such Common Shares, and prior to the expiration of the requisite thirty (30)
Trading Day or ten (10) Trading Day period, as set forth above, after the
ex-dividend date for such dividend or distribution, or the record date for such
subdivision, combination or reclassification, then, and in each such case, the
"current market price" shall be properly adjusted to take into account
ex-dividend trading. The closing price for each Trading Day shall be the last
sale price, regular way, or, in case no such sale takes place on such day, the
average of the closing bid and asked prices, regular way, in either case as
reported in the principal consolidated transaction reporting system with respect
to securities listed or admitted to trading on the New York Stock Exchange or,
if the Common Shares are not listed or admitted to trading on the New York Stock
Exchange, as reported in the principal consolidated transaction reporting system
with respect to securities listed on the principal national securities exchange
on which the Common Shares are listed or admitted to trading or, if the Common
Shares are not listed or admitted to trading on any national securities
exchange, the last quoted price or, if not so quoted, the average of the high
bid and low asked prices in the over-the-counter market, as reported by the
National Association of Securities Dealers, Inc. Automated Quotation System
("Nasdaq") or such other system then in use, or, if on any such date the Common
Shares are not quoted by any such organization, the average of the closing bid
and asked prices as furnished by a professional market maker making a market in
the Common Shares selected by the Board of Directors of the Company. If on any
such date no market maker is making a market in the Common Shares, the fair
value of such shares on such date as determined in good faith by the Board of
Directors of the Company shall be used. The term "Trading Day" shall mean a day
on which the principal national securities exchange on which the Common Shares
are listed or admitted to trading is open for the transaction of business or, if
the Common Shares are not listed or admitted to trading on any national
securities exchange, a Business Day. If the Common Shares are not publicly held
or not so listed or traded,


                                     - 20 -
<PAGE>   24
"current market price" per share shall mean the fair value per share as
determined in good faith by the Board of Directors of the Company, whose
determination shall be described in a statement filed with the Rights Agent and
shall be conclusive for all purposes.

                  (ii) For the purpose of any computation hereunder, the
      "current market price" per Preferred Share shall be determined in the same
      manner as set forth above for the Common Shares in clause (i) of this
      Section 11(d) (other than the last sentence thereof). If the current
      market price per Preferred Share cannot be determined in the manner
      provided above or if the Preferred Shares are not publicly held or listed
      or traded in a manner described in clause (i) of this Section 11(d), the
      "current market price" per Preferred Share shall be conclusively deemed to
      be an amount equal to one hundred (as such number may be appropriately
      adjusted for such events as stock splits, stock dividends and
      recapitalizations with respect to the Common Shares occurring after the
      date of this Agreement) multiplied by the current market price per Common
      Share. If neither the Common Shares nor the Preferred Shares are publicly
      held or so listed or traded, "current market price" per Preferred Share
      shall mean the fair value per share as determined in good faith by the
      Board of Directors of the Company, whose determination shall be described
      in a statement filed with the Rights Agent and shall be conclusive for all
      purposes. For all purposes of this Agreement, the "current market price"
      of a Preferred Share Fraction shall be equal to the "current market price"
      of one Preferred Share divided by 1000.

            (e) Anything herein to the contrary notwithstanding, no adjustment
in the Purchase Price shall be required unless such adjustment would require an
increase or decrease of at least 1% in the Purchase Price; provided, however,
that any adjustments which by reason of this Section 11(e) are not required to
be made shall be carried forward and taken into account in any subsequent
adjustment. All calculations under this Section 11 shall be made to the nearest
cent or to the nearest ten-thousandth of a Common Share or one millionth of a
Preferred Share, as the case may be. Notwithstanding the first sentence of this
subsection (e), any adjustment required by this Section 11 shall be made no
later than the earlier of (i) three (3) years from the date of the transaction
that mandates such adjustment, or (ii) the Expiration Date.

            (f) If as a result of an adjustment made pursuant to Section
11(a)(ii) or Section 13(a) hereof, the holder of any Right thereafter exercised
shall become entitled to receive any shares of capital stock other than
Preferred Shares, thereafter the number of such other shares so receivable upon
exercise of any Right and the Purchase Price thereof shall be subject to
adjustment from time to time in a manner and on terms as nearly equivalent as
practicable to the provisions with respect to the Preferred Shares contained in
Sections 11(a), (b), (c), (e), (g), (h), (i), (j), (k), (m) and (q), and the
provisions of Sections 7, 9, 10, 13 and 14 hereof with respect to the Preferred
Shares shall apply on like terms to any such other shares.


                                     - 21 -
<PAGE>   25
            (g) All Rights originally issued by the Company subsequent to any
adjustment made to the Purchase Price hereunder shall evidence the right to
purchase, at the adjusted Purchase Price, the number of Preferred Share
Fractions purchasable from time to time hereunder upon exercise of the Rights,
all subject to further adjustment as provided herein.

            (h) Unless the Company shall have exercised its election as provided
in Section 11(i), upon each adjustment of the Purchase Price as a result of the
calculations made in subsections (b) and (c), each Right outstanding immediately
prior to the making of such adjustment shall thereafter evidence the right to
purchase, at the adjusted Purchase Price, that number of Preferred Share
Fractions (calculated to the nearest one-one millionth of a Preferred Share)
obtained by (i) multiplying (x) the number of Preferred Share Fractions covered
by a Right immediately prior to this adjustment, by (y) the Purchase Price in
effect immediately prior to such adjustment of the Purchase Price, and (ii)
dividing the product so obtained by the Purchase Price in effect immediately
after such adjustment of the Purchase Price.

            (i) The Company may elect on or after the date of any adjustment of
the Purchase Price to adjust the number of Rights, in lieu of any adjustment in
the number of Preferred Share Fractions purchasable upon the exercise of a
Right. Each of the Rights outstanding after the adjustment in the number of
Rights shall be exercisable for the number of Preferred Share Fractions for
which a Right was exercisable immediately prior to such adjustment. Each Right
held of record prior to such adjustment of the number of Rights shall become
that number of Rights (calculated to the nearest one-one millionth of a
Preferred Share) obtained by dividing the Purchase Price in effect immediately
prior to adjustment of the Purchase Price by the Purchase Price in effect
immediately after adjustment of the Purchase Price. The Company shall make a
public announcement of its election to adjust the number of Rights, indicating
the record date for the adjustment, and, if known at the time, the amount of the
adjustment to be made. The Company shall forward a copy of such public
announcement to the Rights Agent. The record date for the adjustment may be the
date on which the Purchase Price is adjusted or any day thereafter, but, if the
Rights Certificates have been issued, shall be at least ten (10) days later than
the date of the public announcement. If Rights Certificates have been issued,
upon each adjustment of the number of Rights pursuant to this Section 11(i), the
Company shall, as promptly as practicable, cause to be distributed to holders of
record of Rights Certificates on such record date Rights Certificates
evidencing, subject to Section 14 hereof, the additional Rights to which such
holders shall be entitled as a result of such adjustment, or, at the option of
the Company, shall cause to be distributed to such holders of record in
substitution and replacement for the Rights Certificates held by such holders
prior to the date of adjustment, and upon surrender thereof, if required by the
Company, new Rights Certificates evidencing all the Rights to which such holders
shall be entitled after such adjustment. Rights Certificates so to be
distributed shall be issued, executed and countersigned in the manner provided
for herein (and may bear, at the option of the Company, the adjusted Purchase
Price) and shall be registered in


                                     - 22 -
<PAGE>   26
the names of the holders of record of Rights Certificates on the record date
specified in the public announcement.

            (j) Irrespective of any adjustment or change in the Purchase Price
or the number of Preferred Share Fractions issuable upon the exercise of the
Rights, the Rights Certificates theretofore and thereafter issued may continue
to express the Purchase Price per Preferred Share Fraction and the number of
Preferred Share Fractions that were expressed in the initial Rights Certificates
issued hereunder.

            (k) Before taking any action that would cause an adjustment reducing
the Purchase Price below the then stated or par value, if any, of the number of
Preferred Share Fractions issuable upon exercise of the Rights, the Company
shall take any corporate action that may, in the opinion of its counsel, be
necessary in order that the Company may validly and legally issue such number of
fully paid and nonassessable Preferred Share Fractions at such adjusted Purchase
Price.

            (l) In any case in which this Section 11 shall require that an
adjustment in the Purchase Price be made effective as of a record date for a
specified event, the Company may elect to defer until the occurrence of such
event the issuance to the holder of any Right exercised after such record date
the number of Preferred Share Fractions and other capital stock or securities of
the Company, if any, issuable upon such exercise over and above the number of
Preferred Share Fractions and other capital stock or securities of the Company,
if any, issuable upon such exercise on the basis of the Purchase Price in effect
prior to such adjustment; provided, however, that the Company shall deliver to
such holder a due bill or other appropriate instrument evidencing such holder's
right to receive such additional shares (fractional or otherwise) or securities
upon the occurrence of the event requiring such adjustment, and the Company
shall also deliver a copy of such bill or instrument to the Rights Agent.

            (m) Anything in this Section 11 to the contrary notwithstanding, the
Company shall be entitled to make such reductions in the Purchase Price, in
addition to those adjustments expressly required by this Section 11, as and to
the extent that in their good faith judgment the Board of Directors of the
Company shall determine to be advisable in order that any (i) consolidation or
subdivision of the Preferred Shares, (ii) issuance wholly for cash of any
Preferred Shares at less than the current market price, (iii) issuance wholly
for cash for Preferred Shares or securities which by their terms are convertible
into or exchangeable for Preferred Shares, (iv) stock dividends or (v) issuance
of rights, options or warrants referred to in this Section 11, hereafter made by
the Company to holders of its Preferred Shares shall not be taxable to such
stockholders.

            (n) The Company covenants and agrees that it shall not, at any time
after the Distribution Date, (i) consolidate with any other Person (other than a
Subsidiary of the Company 


                                     - 23 -
<PAGE>   27
in a transaction which complies with Section 11(o) hereof), (ii) merge with or
into any other Person (other than a Subsidiary of the Company in a transaction
which complies with Section 11(o) hereof), or (iii) sell or transfer (or permit
any Subsidiary to sell or transfer), in one transaction, or a series of related
transactions, assets or earning power aggregating more than 50% of the assets or
earning power of the Company and its Subsidiaries (taken as a whole) to any
other person or persons (other than the Company and/or any of its Subsidiaries
in one or more transactions each of which complies with Section 11(o) hereof),
if (x) at the time of or immediately after such consolidation, merger or sale
there are any rights, warrants or other instruments or securities outstanding or
agreements in effect that would substantially diminish or otherwise eliminate
the benefits intended to be afforded by the Rights or (y) prior to,
simultaneously with or immediately after such consolidation, merger or sale, the
stockholders of the Person who constitutes, or would constitute, the "Principal
Party" for purposes of Section 13(a) hereof shall have received a distribution
of Rights previously owned by such Person or any of its Affiliates and
Associates.

            (o) The Company covenants and agrees that, after the Distribution
Date, it will not, except as permitted by Section 23 or Section 26 hereof, take
(or permit any Subsidiary to take) any action if at the time such action is
taken it is reasonably foreseeable that such action will diminish substantially
or otherwise eliminate the benefits intended to be afforded by the Rights.

            (p) Anything in this Agreement to the contrary notwithstanding, in
the event that the Company shall at any time after the Rights Dividend
Declaration Date and prior to the Distribution Date (i) declare a dividend on
the outstanding Common Shares payable in Common Shares, (ii) subdivide the
outstanding Common Shares, or (iii) combine the outstanding Common Shares into a
smaller number of shares, the number of Rights associated with each Common Share
then outstanding, or issued or delivered thereafter but prior to the
Distribution Date, shall be proportionately adjusted so that the number of
Rights thereafter associated with each Common Share following any such event
shall equal the result obtained by multiplying the number of Rights associated
with each Common Share immediately prior to such event by a fraction the
numerator of which shall be the total number of Common Shares outstanding
immediately prior to the occurrence of the event and the denominator of which
shall be the total number of Common Shares outstanding immediately following the
occurrence of such event.

            (q) In the event that the Rights become exercisable following a
Section 11(a)(ii) Event, the Company may authorize that the Rights, subject to
Section 7(e) hereof, either (i) will only be, or (ii) may, at the option of the
holder entitled to exercise the Rights be, exercisable for, in either case 50%
of the Common Shares (or cash or other securities or assets to be substituted
for the Adjustment Shares pursuant to subsection (a)(iii)) that would otherwise
be purchasable under subsection (a), in consideration of the surrender to the
Company


                                     - 24 -
<PAGE>   28
of the Rights so exercised and without other payment of the Purchase Price.
Rights exercised under this subsection (q) shall be deemed to have been
exercised in full and shall be canceled.

            SECTION 12. Certificate of Adjusted Purchase Price or Number of
Shares. Whenever an adjustment is made as provided in Section 11 or Section 13
hereof, the Company shall (a) promptly prepare a certificate setting forth such
adjustment and a brief, reasonably detailed statement of the facts and
computations accounting for such adjustment, (b) promptly file with the Rights
Agent, and with each transfer agent for the Preferred Shares and the Common
Shares, a copy of such certificate, and (c) mail a brief summary thereof to each
holder of a Rights Certificate (or, if prior to the Distribution Date, to each
holder of a certificate representing Common Shares) in accordance with Section
25 hereof. The Rights Agent shall be fully protected in relying on any such
certificate and on any adjustment therein contained and shall have no duty with
respect to and shall not be deemed to have knowledge of any such adjustment
unless and until it shall have received such a certificate.

            SECTION 13. Consolidation, Merger or Sale or Transfer of Assets or
Earning Power.

            (a) In the event that, following the Stock Acquisition Date,
directly or indirectly, (x) the Company shall consolidate with, or merge with
and into, any other Person (other than a Subsidiary of the Company in a
transaction which complies with Section 11(o) hereof), and the Company shall not
be the continuing or surviving corporation of such consolidation or merger, (y)
any person (other than a Subsidiary of the Company in a transaction which
complies with Section 11(o) hereof) shall consolidate with, or merge with or
into, the Company, and the Company shall be the continuing or surviving
corporation of such consolidation or merger and, in connection with such
consolidation or merger, all or part of the outstanding Common Shares shall be
changed into or exchanged for stock or other securities of any other Person or
cash or any other property, or (z) the Company shall sell or otherwise transfer
(or one or more of its Subsidiaries shall sell or otherwise transfer), in one
transaction or a series of related transactions, assets or earning power
aggregating more than 50% of the assets, operating income, cash flow or earning
power of the Company and its Subsidiaries (taken as a whole) to any Person or
Persons (other than the Company or any Subsidiary of the Company in one or more
transactions each of which complies with Section 11(o) hereof), then, and in
each such case and except as contemplated by subsection (d), proper provision
shall be made so that:

                  (i) each holder of a Right, except as provided in Section 7(e)
      hereof or subsection (e), shall thereafter have the right to receive, upon
      the exercise thereof at the then current Purchase Price in accordance with
      the terms of this Agreement, such number of validly authorized and issued,
      fully paid, non assessable and freely tradeable Common Shares of the
      Principal Party (as such term is hereinafter defined), not subject to any
      liens, encumbrances, rights of first refusal or other adverse claims, as
      shall be equal to the


                                     - 25 -
<PAGE>   29
      result obtained by (1) multiplying the then current Purchase Price by the
      number of Preferred Share Fractions for which a Right is exercisable
      immediately prior to the first occurrence of a Section 13 Event (or, if a
      Section 11(a)(ii) Event has occurred prior to the first occurrence of a
      Section 13 Event, multiplying the number of such shares for which a Right
      was exercisable immediately prior to the first occurrence of a Section
      11(a)(ii) Event by the Purchase Price in effect immediately prior to such
      first occurrence), and (2) dividing that product (which, following the
      first occurrence of a Section 13 Event, shall be referred to as the
      "Purchase Price" for each Right and for all purposes of this Agreement) by
      50% of the current market price (determined pursuant to Section 11(d)(i)
      hereof) per Common Share of such Principal Party on the date of
      consummation of such Section 13 Event;

                  (ii) such Principal Party shall thereafter be liable for, and
      shall assume, by virtue of such Section 13 Event, all the obligations and
      duties of the Company pursuant to this Agreement;

                  (iii) the term "Company" shall thereafter be deemed to refer
      to such Principal Party, it being specifically intended that the
      provisions of Section 11 hereof shall apply only to such Principal Party
      following the first occurrence of a Section 13 Event;

                  (iv) such Principal Party shall take such steps (including,
      but not limited to, the reservation of a sufficient number of its Common
      Shares) in connection with the consummation of any such transaction as may
      be necessary to assure that the provisions hereof shall thereafter be
      applicable, as nearly as reasonably may be, in relation to its Common
      Shares thereafter deliverable upon the exercise of the Rights; and

                  (v) the provisions of Section 11(a)(ii) hereof shall be of no
      effect following the first occurrence of any Section 13 Event.

            (b) "Principal Party" shall mean

                  (i) in the case of any transaction described in clause (x) or
      (y) of the first sentence of subsection (a), the Person that is the issuer
      of any securities into which Common Shares of the Company are converted in
      such merger or consolidation, and if no securities are so issued, the
      Person that is the other party to such merger or consolidation; and

                  (ii) in the case of any transaction described in clause (z) of
      the first sentence of subsection (a), the Person that is the party
      receiving the greatest portion of the assets or earning power transferred
      pursuant to such transaction or transactions;


                                     - 26 -
<PAGE>   30
provided, however, that in the case of either (i) or (ii) above, (1) if the
Common Shares of such Person are not at such time and have not been continuously
over the preceding twelve (12) month period registered under Section 12 of the
Exchange Act, and such Person is a direct or indirect Subsidiary of another
Person the Common Shares of which are and have been so registered, "Principal
Party" shall refer to such other Person, and (2) in case such Person is a
Subsidiary, directly or indirectly, of more than one Person, the Common Shares
of two or more of which are and have been so registered, "Principal Party" shall
refer to whichever of such Persons is the issuer of the Common Shares having the
greatest aggregate market value.

            (c) The Company shall not consummate any such consolidation, merger,
sale or transfer unless the Principal Party shall have a sufficient number of
authorized shares of its Common Shares that have not been issued or reserved for
issuance to permit the exercise in full of the Rights in accordance with this
Section 13 and unless prior thereto the Company and such Principal Party shall
have executed and delivered to the Rights Agent a supplemental agreement
providing for the terms set forth in paragraphs (a) and (b) of this Section 13
and further providing that, as soon as practicable after the date of any Section
13 event, the Principal Party will

                  (i) prepare and file a registration statement under the Act,
      with respect to the Rights and the securities purchasable upon exercise of
      the Rights on an appropriate form, and will use its best efforts to cause
      such registration statement to (A) become effective as soon as practicable
      after such filing and (B) remain effective (with a prospectus at all times
      meeting the requirements of the Act) until the Expiration Date;

                  (ii) use its best efforts to qualify or register the Rights
and the securities purchasable upon exercise of the Rights under blue sky laws
of such jurisdiction, as may be necessary or appropriate; and

                  (iii) deliver to holders of the Rights historical financial
      statements for the Principal Party and each of its Affiliates that comply
      in all respects with the requirements for registration on Form 10 under
      the Exchange Act.

The provisions of this Section 13 shall similarly apply to successive mergers or
consolidations or sales or other transfers. In the event that a Section 13 Event
shall occur at any time after the occurrence of a Section 11(a)(ii) Event, the
Rights that have not theretofore been exercised shall thereafter become
exercisable solely in the manner described in Section 13(a).

            (d) Notwithstanding anything in this Agreement to the contrary,
Section 13 (other than this subsection (d)) shall not be applicable to, and the
term "Section 13 Event" shall not include, a transaction described in
subparagraphs (x) and (y) of Section 13(a) if (i) such transaction is
consummated with a Person, or Persons who acquired Common Shares pursuant to a
Qualifying Offer (or a wholly owned Subsidiary of any such Person or Persons),
(ii) the price 


                                     - 27 -
<PAGE>   31
per Common Share offered in such transaction is not less than the price per
Common Share paid to all holders of Common Shares whose shares were purchased
pursuant to such tender offer or exchange offer and (iii) the form of
consideration being offered to the remaining holders of Common Shares pursuant
to such transaction is the same as the form of consideration paid pursuant to
such tender or exchange offer. Upon consummation of any such transaction
contemplated by this subsection (d), all Rights hereunder shall expire.

            (e) In the event that the Rights become exercisable under subsection
(a) (except as provided in subsection (d)), the Company, by action of a majority
of the members of the Board of Directors in office at the time, may authorize
that the Rights either (i) will only be or (ii) may, at the option of the
Principal Party be, exercisable for, 50% of the Common Shares of the Principal
Party that would otherwise be purchasable under subsection (a), in consideration
of the surrender to the Principal Party, as the successor to the Company under
subsection (a) (ii), of the Rights so exercised and without other payment of the
Purchase Price. Rights exercised under this subsection (e) shall be deemed to
have been exercised in full and shall be canceled.

            SECTION 14. Fractional Rights and Fractional Shares.

            (a) The Company shall not be required to issue fractions of Rights,
except prior to the Distribution Date as provided in Section 11(p) hereof, or to
distribute Rights Certificates that evidence fractional Rights. In lieu of such
fractional Rights, there shall be paid to the registered holders of the Rights
Certificates with regard to which such fractional Rights would otherwise be
issuable, an amount in cash equal to the same fraction of the current market
value of a whole Right. For purposes of this subsection (a), the current market
value of a whole Right shall be the closing price of the Rights for the Trading
Day immediately prior to the date on which such fractional Rights would have
been otherwise issuable. The closing price of the Rights for any day shall be
the last sale price, regular way, or, in case no such sale takes place on such
day, the average of the closing bid and asked prices, regular way, in either
case as reported in the principal consolidated transaction reporting system with
respect to securities listed or admitted to trading on the New York Stock
Exchange or, if the Rights are not listed or admitted to trading on the New York
Stock Exchange, as reported in the principal consolidated transaction reporting
system with respect to securities listed on the principal national securities
exchange on which the Rights are listed or admitted to trading, or if the Rights
are not listed or admitted to trading on any national securities exchange, the
last quoted price or, if not so quoted, the average of the high bid and low
asked prices in the over-the-counter market, as reported by Nasdaq or such other
system then in use or, if on any such date the Rights are not quoted by any such
organization, the average of the closing bid and asked prices as furnished by a
professional market maker making a market in the Rights selected by the Board of
Directors of the Company. If on any such date no such market maker is making a
market in the Rights the fair value of the Rights on such date as determined in
good faith by the Board of Directors of the Company shall be used.


                                     - 28 -
<PAGE>   32
            (b) The Company shall not be required to issue fractions of
Preferred Shares upon exercise of the Rights or to distribute certificates which
evidence fractional Preferred Shares, except in each case for fractions which
are integral multiples of Preferred Shares. In lieu of fractional Preferred
Shares that are not integral multiples of Preferred Shares, the Company may pay
to the registered holders of Rights Certificates at the time such Rights are
exercised as herein provided an amount in cash equal to the same fraction of the
current market value of a Preferred Share. For purposes of this subsection (b),
the current market value of one Preferred Share shall be the closing price of a
Preferred Share (as determined pursuant to Section 11(d)(ii) hereof) for the
Trading Day immediately prior to the date of such exercise.

            (c) Following the occurrence of a Triggering Event, the Company
shall not be required to issue fractions of Common Shares upon exercise of the
Rights or to distribute certificates that evidence fractional Common Shares. In
lieu of fractional Common Shares, the Company may pay to the registered holders
of Rights Certificates at the time such Rights are exercised as herein provided
an amount in cash equal to the same fraction of the current market value of one
Common Share. For purposes of this subsection (c), the current market value of
one Common Share shall be the closing price of one Common Share (as determined
pursuant to Section 11(d)(i) hereof) for the Trading Day immediately prior to
the date of such exercise.

            (d) Whenever a payment for fractional Rights or fractional shares is
to be made by the Rights Agent, the Company shall (i) promptly prepare and
deliver to the Rights Agent a certificate setting forth in reasonable detail the
facts related to such payment and the process and/or formulas utilized in
calculating such payments, and (ii) provide sufficient monies to the Rights
Agent in the form of fully collected funds to make such payments. The Rights
Agent shall be fully protected in relying on such certificate and shall have no
duty with respect to and shall not be deemed to have knowledge of any payment
for fractional Rights or fractional shares under this Section 4 unless and until
it shall have received such a certificate and sufficient monies.

            (e) The holder of a Right or a beneficial interest in a Right by the
acceptance thereof expressly waives his right to receive any fractional Rights
or any fractional Common Shares upon exercise of a Right, except as permitted by
this Section 14.

            SECTION 15. Rights of Action. All rights of action in respect of
this Agreement are vested in the respective registered holders of the Rights
Certificates (and, prior to the Distribution Date, the registered holders of the
Common Shares); and any registered holder of any Rights Certificate (or, prior
to the Distribution Date, of the Common Shares), without the consent of the
Rights Agent or of the holder of any other Rights Certificate (or, prior to the
Distribution Date, of the Common Shares), may, in his own behalf and for his own
benefit, enforce, and may institute and maintain any suit, action or proceeding
against the Company to enforce, or otherwise act in respect of, his right to
exercise the Rights evidenced by such Rights


                                     - 29 -
<PAGE>   33
Certificate in the manner provided in such Rights Certificate and in this
Agreement. Without limiting the foregoing or any remedies available to the
holders of Rights or beneficial interests therein, it is specifically
acknowledged that the holders of Rights or beneficial interests therein would
not have an adequate remedy at law for any breach of this Agreement and shall be
entitled to specific performance of the obligations hereunder and injunctive
relief against actual or threatened violations of the obligations hereunder of
any Person subject to this Agreement.

            SECTION 16. Agreement of Rights Holders. Every holder of a Right or
a beneficial interest in a Right by accepting the same consents and agrees with
the Company and the Rights Agent and with every other such holder that:

            (a) prior to the Distribution Date, beneficial interests in the
Rights will be transferable only in connection with the transfer of Common
Shares;

            (b) after the Distribution Date, the Rights Certificates are
transferable only on the registry books of the Rights Agent if surrendered at
the office of the Rights Agent designated for such purposes, duly endorsed or
accompanied by a proper instrument of transfer and with the appropriate forms
and certificates fully executed;

            (c) subject to Section 6(a) and Section 7(f) hereof, the Company and
the Rights Agent may deem and treat the Person in whose name a Rights
Certificate (or, prior to the Distribution Date, the associated Common Share
certificate) is registered as the absolute owner thereof and of the Rights
evidenced thereby (notwithstanding any notations of ownership or writing on the
Rights Certificates or the associated Common Share certificate made by anyone
other than the Company or the Rights Agent) for all purposes whatsoever, and
neither the Company nor the Rights Agent shall be required to be affected by any
notice to the contrary; and

            (d) notwithstanding anything in this Agreement to the contrary,
neither the Company nor the Rights Agent shall have any liability to any holder
of a Right or a beneficial interest in a Right or other Person as a result of
its inability to perform any of its obligations under this Agreement by reason
of any preliminary or permanent injunction or other order, decree, judgment or
ruling (whether interlocutory or final) issued by a court of competent
jurisdiction or by a governmental, regulatory or administrative agency or
commission, or any statute, rule, regulation or executive order promulgated or
enacted by any governmental authority, prohibiting or otherwise restraining
performance of such obligation; provided, however, the Company must use its best
efforts to have any such order, decree, judgment or ruling lifted or otherwise
overturned as soon as possible.

            SECTION 17. Rights Certificate Holder Not Deemed a Stockholder. No
holder, as such, of any Rights Certificate shall be entitled to vote, receive
dividends or be deemed for any purpose the holder of the number of Preferred
Share Fractions or any other 


                                     - 30 -
<PAGE>   34
securities of the Company (including the Common Shares) that may at any time be
issuable on the exercise of the Rights represented thereby, nor shall anything
contained herein or in any Rights Certificate be construed to confer upon the
holder of any Rights Certificate, as such, any of the rights of a stockholder of
the Company or any right to vote for the election of directors or upon any
matter submitted to stockholders at any meeting thereof, or to give or withhold
consent to any corporate action, or to receive notice of meetings or other
actions affecting stockholders (except as provided in Section 24 hereof), or to
receive dividends or subscription rights, or otherwise, until the Right or
Rights evidenced by such Rights Certificate shall have been exercised in
accordance with the provisions hereof.

            SECTION 18. Concerning the Rights Agent.

            (a) The Company agrees to pay to the Rights Agent reasonable
compensation for all services rendered by it hereunder and, from time to time,
on demand of the Rights Agent, its reasonable expenses and counsel fees and
disbursements and other disbursements incurred in the preparation, execution,
delivery, amendment, administration and execution of this Agreement and the
exercise and performance of its duties hereunder. The Company also agrees to
indemnify the Rights Agent and its directors, officers, employees and agents,
for and to hold each of them harmless against, any loss, liability, damage,
judgment, fine, penalty, claim, demand, settlement, cost or expense, incurred
without gross negligence, bad faith or willful misconduct on the part of the
Rights Agent or any such indemnified party, for any action taken, suffered or
omitted by the Rights Agent in connection with the acceptance or administration
of this Agreement or the exercise of its duties hereunder, including without
limitation the costs and expenses of defending against any claim of liability in
the premises.

            (b) The Rights Agent shall be protected and shall incur no liability
for or in respect of any action taken, suffered or omitted by it in connection
with the acceptance and administration of this Agreement or in the exercise of
its duties hereunder in reliance upon any Rights Certificate or certificate for
Common Shares or for other securities of the Company, instrument of assignment
or transfer, power of attorney, endorsement, affidavit, letter, notice,
direction, consent, certificate, statement, or other paper or document believed
by it to be genuine and to be signed, executed and, where necessary, verified or
acknowledged, by the proper Person or Persons.

            SECTION 19. Merger or Consolidation or Change of Name of Rights
Agent.

            (a) Any Person into which the Rights Agent or any successor Rights
Agent may be merged or with which it may be consolidated, or any Person
resulting from any merger or consolidation to which the Rights Agent or any
successor Rights Agent shall be a party, or any Person succeeding to the
stockholder services or stock transfer business of the Rights Agent or any
successor Rights Agent, shall be the successor to the Rights Agent under this
Agreement 


                                     - 31 -
<PAGE>   35
without the execution or filing of any paper or any further act on the part of
any of the parties hereto; provided, however, that such Person would be eligible
for appointment as a successor Rights Agent under the provisions of Section 21
hereof.

            (b) In case at any time the name of the Rights Agent shall be
changed and at such time any of the Rights Certificates shall have been
countersigned but not delivered the Rights Agent may adopt the countersignature
under its prior name and deliver Rights Certificates so countersigned; and in
case at that time any of the Rights Certificates shall not have been
countersigned, the Rights Agent may countersign such Rights Certificates either
in its prior name or in its changed name; and in all such cases such Rights
Certificates shall have the full force provided in the Rights Certificates and
in this Agreement.

            SECTION 20. Duties of Rights Agent. The Rights Agent undertakes the
duties and obligations, and only the duties and obligations, expressly imposed
by this Agreement (and no implied duties or obligations) upon the following
terms and conditions, by all of which the Company and the holders of Rights
Certificates or beneficial interests in the Rights, by their acceptance thereof,
shall be bound:

            (a) The Rights Agent may consult with legal counsel (who may be
legal counsel for the Company), and the advice or written opinion of such
counsel shall be full and complete authorization and protection to the Rights
Agent, and the Rights Agent shall incur no liability for or in respect of, any
action taken, suffered or omitted by it in good faith and in accordance with
such advice or opinion.

            (b) Whenever in the performance of its duties under this Agreement
the Rights Agent shall deem it necessary or desirable that any fact or matter
(including, without limitation, the identity of any Acquiring Person and the
determination of "current market price") be proved or established by the Company
prior to taking, suffering or omitting any action hereunder, such fact or matter
(unless other evidence in respect thereof be herein specifically prescribed) may
be deemed to be conclusively proved and established by a certificate signed by
the Chairman of the Board, the President, any Vice President, the Treasurer, any
Assistant Treasurer, the Secretary or any Assistant Secretary of the Company and
delivered to the Rights Agent; and such certificate shall be full authorization
and protection to the Rights Agent and the Rights Agent shall incur no liability
for or in respect of any action taken, suffered or omitted in good faith by it
under the provisions of this Agreement in reliance upon such certificate.

            (c) The Rights Agent shall be liable hereunder only for its own
gross negligence, bad faith or willful misconduct; provided, however that the
Rights Agent shall not be liable for special, indirect, incidental or
consequential loss or damage of any kind whatsoever, even if the Rights Agent
has been advised of the likelihood of such loss or damage.


                                     - 32 -
<PAGE>   36
            (d) The Rights Agent shall not be liable for or by reason of any of
the statements of fact or recitals contained in this Agreement or in the Rights
Certificates or be required to verify the same (except as to its
countersignature on such Rights Certificates), but all such statements and
recitals are and shall be deemed to have been made by the Company only.

            (e) The Rights Agent shall not be under any liability or
responsibility in respect of the validity of any provision of this Agreement or
the execution and delivery hereof (except the due execution hereof by the Rights
Agent) or in respect of the validity or execution of any Rights Certificate
(except its countersignature thereof); nor shall it be responsible for any
breach by the Company of any covenant or condition contained in this Agreement
or in any Rights Certificate; nor shall it be responsible for any adjustment
required under the provisions of this Agreement or responsible for the manner,
method or amount of any such adjustment or the ascertaining of the existence of
facts that would require any such adjustment (except with respect to the
exercise of Rights evidenced by Rights Certificates after actual notice of any
such adjustment); nor shall it by any act hereunder be deemed to make any
representation or warranty as to the authorization or reservation of any Common
Shares to be issued pursuant to this Agreement or any Rights Certificate or as
to whether any Common Shares or Preferred Shares will, when so issued, be
validly authorized and issued, fully paid and nonassessable.

            (f) The Company agrees that it will perform, execute, acknowledge
and deliver or cause to be performed, executed, acknowledged and delivered all
such further and other acts, instruments and assurances as may reasonably be
required by the Rights Agent for the carrying out or performing by the Rights
Agent of the provisions of this Agreement.

            (g) The Rights Agent is hereby authorized and directed to accept
instructions with respect to the performance of its duties hereunder from any
one of the Chairman of the Board, the President, any Vice President, the
Secretary, any Assistant Secretary, the Treasurer or any Assistant Treasurer of
the Company, and to apply to such officers for advice or instructions in
connection with its duties, and such instructions shall be full authorization
and protection for the Rights Agent and the Rights Agent shall incur no
liability for or in respect of any action taken, suffered or omitted to be taken
by it in good faith in accordance with instructions of any such officer. The
Rights Agent may conclusively rely on the most recent instructions provided to
it by any such officer.

            (h) The Rights Agent and any stockholder, affiliate, director,
officer or employee of the Rights Agent may buy, sell or deal in any of the
Rights or other securities of the Company or become pecuniarily interested in
any transaction in which the Company may be interested, or contract with or lend
money to the Company or otherwise act as fully and freely as though it were not
the Rights Agent under this Agreement and none of such actions shall constitute
a breach of trust. Nothing herein shall preclude the Rights Agent from acting in
any other capacity for the Company or for any other Person or legal entity.


                                     - 33 -
<PAGE>   37
            (i) The Rights Agent may execute and exercise any of the rights or
powers hereby vested in it or perform any duty hereunder either itself or by or
through its attorneys or agents, and the Rights Agent shall not be answerable or
accountable for any act, default, neglect or misconduct of any such attorneys or
agents or for any loss to the Company or any other Person resulting from any
such act, default, neglect or misconduct, absent gross negligence, bad faith or
willful misconduct in the selection and continued employment thereof.

            (j) No provision of this Agreement shall require the Rights Agent to
expend or risk its own funds or otherwise incur any financial liability in the
performance of any of its duties hereunder or in the exercise of its rights if
it believes that repayment of such funds or adequate indemnification against
such risk or liability is not reasonably assured to it.

            (k) If, with respect to any Rights Certificate surrendered to the
Rights Agent for exercise or transfer, the certificate attached to the form of
assignment or form of election to purchase, as the case may be, has either not
been completed or indicates an affirmative response to clause 1 and/or 2
thereof, the Rights Agent shall not take any further action with respect to such
requested exercise or transfer without first consulting with the Company.

            SECTION 21. Change of Rights Agent. The Rights Agent or any
successor Rights Agent may resign and be discharged from its duties under this
Agreement upon thirty (30) days' prior written notice mailed to the Company and
to each transfer agent of the Common Shares and Preferred Shares by registered
or certified mail, and to the holders of the Rights Certificates by first-class
mail. The Company may remove the Rights Agent or any successor Rights Agent upon
thirty (30) days' prior written notice mailed to the Rights Agent or successor
Rights Agent, as the case may be, and to each transfer agent of the Common
Shares and Preferred Shares, by registered or certified mail, and to the holders
of the Rights Certificates by first-class mail. If the Rights Agent shall resign
or be removed or shall otherwise become incapable of acting, the Company shall
appoint a successor to the Rights Agent. If the Company shall fail to make such
appointment within a period of thirty (30) days after giving notice of such
removal or after it has been notified in writing of such resignation or
incapacity by the resigning or incapacitated Rights Agent or by the holder of a
Rights Certificate (who shall, with such notice, submit his Rights Certificate
for inspection by the Company), then any registered holder of any Rights
Certificate may apply to any court of competent jurisdiction for the appointment
of a new Rights Agent. Any successor Rights Agent, whether appointed by the
Company or by such a court, shall be (a) a Person organized, doing business and
in good standing under the laws of the United States or of any state, having a
principal office in the State of New York or the Commonwealth of Pennsylvania,
that is authorized by law to exercise stockholder services and stock transfer
powers and is subject to supervision or examination by federal or state
authority and that has at the time of its appointment as Rights Agent a combined
capital and surplus of at least $50,000,000 or (b) an Affiliate of any such
Person. After appointment, the successor Rights Agent shall be vested with the
same powers, rights, duties and responsibilities as if it had been


                                     - 34 -
<PAGE>   38
originally named as Rights Agent without further act or deed; but the
predecessor Rights Agent shall deliver and transfer to the successor Rights
Agent any property at the time held by it hereunder, and execute and deliver any
further assurance, conveyance, act or deed necessary for the purpose. Not later
than the effective date of any such appointment, the Company shall file notice
thereof in writing with the predecessor Rights Agent and each transfer agent of
the Common Shares and Preferred Shares and mail a notice thereof in writing to
the registered holders of the Rights Certificates or, prior to the Distribution
Date, to the registered holders of the Common Shares. In case at the time such
successor Rights Agent shall succeed to the agency and trust created by this
Agreement, any of the Rights Certificates shall have been countersigned but not
delivered, any such successor Rights Agent may adopt the countersignature of a
predecessor Rights Agent and deliver such Rights Certificates so countersigned;
and in case at that time any of the Rights Certificates shall not have been
countersigned, any successor Rights Agent may countersign such Rights
Certificates either in the name of the predecessor or in the name of the
successor Rights Agent; and in all such cases such Rights Certificates shall
have the full force provided in the Rights Certificates and in this Agreement.
Failure to give any notice provided for in this Section 21, however, or any
defect therein, shall not affect the legality or validity of the resignation or
removal of the Rights Agent or the appointment of the successor Rights Agent, as
the case may be.

            SECTION 22. Issuance of New Rights Certificates. Notwithstanding any
of the provisions of this Agreement or of the Rights to the contrary, the
Company may, at its option, issue new Rights Certificates evidencing Rights in
such form as may be approved by its Board of Directors to reflect any adjustment
or change in the Purchase Price and the number or kind or class of shares or
other securities or property purchasable under the Rights Certificates made in
accordance with the provisions of this Agreement. In addition, in connection
with the issuance, sale or delivery of Common Shares following the Distribution
Date and prior to the redemption or expiration of the Rights, the Company (a)
shall, with respect to Common Shares so issued, sold or delivered pursuant to
the exercise of stock options, stock appreciation rights, grants or awards
outstanding on the Distribution Date under any benefit plan or arrangement for
employees or directors, or upon the exercise, conversion or exchange of
securities outstanding on the Record Date or hereinafter issued by the Company,
and (b) may, in any other case, if deemed necessary or appropriate by the Board
of Directors of the Company, issue Rights Certificates representing the
appropriate number of Rights in connection with such issuance or sale; provided,
however, that (i) no such Rights Certificate shall be issued if, and to the
extent that, the Company shall be advised by counsel that such issuance would
create a significant risk of material adverse tax consequences to the Company or
the Person to whom such Rights Certificate would be issued, and (ii) no such
Rights Certificate shall be issued if, and to the extent that, appropriate
adjustment shall otherwise have been made in lieu of the issuance thereof.


                                     - 35 -
<PAGE>   39
            SECTION 23. Redemption and Termination.

            (a) The Board of Directors of the Company may, at its option, at any
time prior to the earlier of (i) the Close of Business on the tenth day
following a Stock Acquisition Date (or, if the Stock Acquisition Date shall have
occurred prior to the Record Date, the Close of Business on the tenth day
following the Record Date), or (ii) the Close of Business on the Final
Expiration Date, redeem all but not less than all the then outstanding Rights at
a redemption price of $.001 per Right, as such amount may be appropriately
adjusted to reflect any stock split, stock dividend or similar transaction
occurring after the date hereof (such redemption price being hereinafter
referred to as the "Redemption Price") and the Company may, at its option, pay
the Redemption Price either in Common Shares (based on the "current market
price", as defined in Section 11(d)(i) hereof, of the Common Shares at the time
of redemption) or cash; provided, however, that if, following the occurrence of
a Stock Acquisition Date and following the expiration of the right of redemption
hereunder but prior to any Triggering Event, (i) an Acquiring Person shall have
transferred or otherwise disposed of a number of Common Shares in one
transaction or series of transactions, not directly or indirectly involving the
Company or any of its Subsidiaries, which did not result in the occurrence of a
Triggering Event or the Company shall have issued additional equity securities,
in either instance such that such Person is thereafter a Beneficial Owner of 10%
or less of the outstanding Common Shares, and (ii) there is no other Acquiring
Person immediately following the occurrence of the event described in clause
(i), then the right of redemption shall be reinstated and thereafter be subject
to the provisions of this Section 23. Notwithstanding anything contained in this
Agreement to the contrary, the Rights shall not be exercisable after the first
occurrence of a Section 11(a)(ii) Event until such time as the Company's right
of redemption hereunder has expired.

            (b) Immediately upon the action of the Board of Directors of the
Company ordering the redemption of the Rights, without any notice, or further
action, the right to exercise the Rights will terminate and the only right
thereafter of the holders of Rights shall be to receive the Redemption Price for
each Right so held. Promptly after the action of the Board of Directors ordering
the redemption of the Rights, the Company shall give notice of such redemption
to the Rights Agent and the holders of the then outstanding Rights by, in the
case of notice to holders, mailing such notice to all such holders at each
holder's last address as it appears upon the registry books of the Rights Agent
or, prior to the Distribution Date, on the registry books of the Transfer Agent
for the Common Shares. Any notice that is mailed in the manner herein provided
shall be deemed given, whether or not the holder receives the notice. Each such
notice of redemption will state the method by which the payment of the
Redemption Price will be made.


                                     - 36 -
<PAGE>   40
            SECTION 24. Exchange.

            (a) The Board of Directors of the Company may, at its option, at any
time after any Person becomes an Acquiring Person, exchange all or part of the
then outstanding and exercisable Rights (which shall not include Rights that
have become null and void pursuant to the provisions of Section 7(e) hereof) for
Common Shares at an exchange ratio of one Common Share per Right, appropriately
adjusted to reflect any stock split, stock dividend or similar transaction
occurring after the date hereof (such exchange ratio being hereinafter referred
to as the "Exchange Ratio"). Notwithstanding the foregoing, the Company's Board
of Directors shall not be empowered to effect such exchange at any time after
any Person (other than the Company, any Subsidiary of the Company, any employee
benefit plan of the Company or any such Subsidiary, or any Person organized,
appointed or established by the Company for or pursuant to the terms of any such
plan), together with all Affiliates and Associates of such Person, becomes the
Beneficial Owner of 50% or more of the Common Shares then outstanding.

            (b) Immediately upon the action of the Board of Directors of the
Company ordering the exchange of any Rights pursuant to subsection (a) of this
Section 24 and without any further action and without any notice, the right to
exercise such Rights shall terminate and the only right thereafter of the
holders of such Rights shall be to receive that number of Common Shares equal to
the number of such Rights held by such holder multiplied by the Exchange Ratio.
The Company shall promptly give public notice of any such exchange; provided,
however, that the failure to give, or any defect in, such notice shall not
affect the validity of such exchange. The Company shall promptly notify the
Rights Agent of any such exchange. The Company promptly shall mail a notice of
any such exchange to all of the holders of such Rights at their last addresses
as they appear upon the registry books of the Rights Agent. Any notice which is
mailed in the manner herein provided shall be deemed given, whether or not the
holder receives the notice. Each such notice of exchange will state the method
by which the exchange of the Common Shares for Rights will be effected and, in
the event of any partial exchange, the number of Rights which will be exchanged.
Any partial exchange shall be effected pro rata based on the number of Rights
(other than Rights which have become void pursuant to the provisions of Section
7(e) hereof) held by each holder of Rights.

            (c) In the event that there shall not be sufficient Common Shares
issued but not outstanding or authorized but issued to permit any exchange of
Rights as contemplated in accordance with this Section 24, the Company shall
take all such action as may be necessary to authorize additional Common Shares
for issuance upon exchange of the Rights.

            (d) The Company shall not be required to issue fractions of Common
Shares or to distribute certificates which evidence fractional Common Shares. In
lieu of such fractional Common Shares, there shall be paid to the registered
holders of the Rights Certificates with regard to which such fractional Common
Shares would otherwise be issuable, an amount in cash 


                                     - 37 -
<PAGE>   41
equal to the same fraction of the current market value of a whole Common Share.
For the purposes of this subsection (d), the current market value of a whole
Common Share shall be the closing price of a Common Share (as determined
pursuant to the second sentence of Section 11(d) hereof) for the Trading Day
immediately prior to the date of exchange pursuant to this Section 24.

            SECTION 25. Notice of Certain Events.

            (a) In case the Company shall propose, at any time after the
Distribution Date, (i) to pay any dividend payable in stock of any class to the
holders of Preferred Shares or to make any other distribution to the holders of
Preferred Shares (other than a regular quarterly dividend out of earnings or
retained earnings of the Company), or (ii) to offer to the holders of Preferred
Shares rights or warrants to subscribe for or to purchase any additional
Preferred Shares or shares of stock of any class or any other securities, rights
or options, or (iii) to effect any reclassification of its Preferred Shares
(other than a reclassification involving only the subdivision of outstanding
Preferred Shares), or (iv) to effect any consolidation or merger into or with
any other Person (other than a Subsidiary of the Company in a transaction which
complies with Section 11(o) hereof), or to effect any sale or other transfer (or
to permit one or more of its Subsidiaries to effect any sale or other transfer),
in one transaction or a series of related transactions, of more than 50% of the
assets or earning power of the Company and its Subsidiaries (taken as a whole)
to any other Person or Persons (other than the Company and/or any of its
Subsidiaries in one or more transactions each of which complies with Section
11(o) hereof), or (v) to effect the liquidation, dissolution or winding up of
the Company, then, in each such case, the Company shall give to the Rights Agent
and to each holder of a Rights Certificate, to the extent feasible and in
accordance with Section 26 hereof, a notice of such proposed action, which shall
specify the record date for the purposes of such stock dividend, distribution of
rights or warrants, or the date on which such reclassification, consolidation,
merger, sale, transfer, liquidation, dissolution, or winding up is to take place
and the date of participation therein by the holders of Preferred Shares, if any
such date is to be fixed, and such notice shall be so given in the case of any
action covered by clause (i) or (ii) above at least twenty (20) days prior to
the record date for determining holders of Preferred Shares for purposes of such
action, and in the case of any such other action, at least twenty (20) days
prior to the date of the taking of such proposed action or the date of
participation therein by the holders of Preferred Shares, whichever shall be the
earlier.

            (b) Upon the occurrence of a Section 11(a)(ii) Event, (i) the
Company shall as soon as practicable thereafter give to each holder of a Rights
Certificate, to the extent feasible and in accordance with Section 26 hereof, a
notice of the occurrence of such event, which shall specify the event and the
consequences of the event to holders of Rights under Section 11(a)(ii) hereof,
and (ii) all references in the preceding paragraph to Preferred Shares shall be
deemed thereafter to refer to Common Shares and/or, if appropriate, other
securities.


                                     - 38 -
<PAGE>   42
            SECTION 26. Notices. Notices or demands authorized by this Agreement
to be given or made by the Rights Agent or by the holder of any Rights
Certificate to or on the Company shall be sufficiently given or made if sent by
first-class mail, postage prepaid, addressed (until another address is filed in
writing with the Rights Agent) as follows:


                  CMAC Investment Corporation
                  1601 Market Street
                  Philadelphia, Pennsylvania  19103
                  Attention: Corporate Secretary

Subject to the provisions of Section 21, any notice or demand authorized by this
Agreement to be given or made by the Company or by the holder of any Rights
Certificate to or on the Rights Agent shall be sufficiently given or made if
sent by first-class mail, postage prepaid, addressed (until another address is
filed in writing with the Company) as follows:

                  The Bank of New York 
                  101 Barclay Street 
                  New York, New York  10286 
                  Attention:

Notices or demands authorized by this Agreement to be given or made by the
Company or the Rights Agent to the holder of any Rights Certificate (or, if
prior to the Distribution Date to the holder of certificates representing Common
Shares) shall be sufficiently given or made if sent by first-class mail, postage
prepaid, addressed to such holder at the address of such holder as shown on the
registry books of the Company.

            SECTION 27. Supplements and Amendments. Prior to the Distribution
Date and subject to the penultimate sentence of this Section 27, the Company may
and the Rights Agent shall, if the Company so directs, supplement or amend any
provision of this Agreement without the approval of any holders of certificates
representing Common Shares. From and after the Distribution Date and subject to
the penultimate sentence of this Section 27, the Company may and the Rights
Agent shall, if the Company so directs, supplement or amend this Agreement
without the approval of any holders of Rights Certificates in order (i) to cure
any ambiguity, (ii) to correct or supplement any provision contained herein
which may be defective or inconsistent with any other provisions herein, (iii)
to shorten or lengthen any time period hereunder, or (iv) to change or
supplement the provisions hereunder in any manner that the Company may deem
necessary or desirable and that shall not adversely affect the interests of the
holders of Rights Certificates; provided, this Agreement may not be supplemented
or amended to lengthen, pursuant to clause (iii) of this sentence, (A) a time
period relating to when the Rights may be redeemed at such time as the Rights
are not then redeemable, or (B) any other time period unless


                                     - 39 -
<PAGE>   43
such lengthening is for the purpose of protecting, enhancing or clarifying the
rights of, and/or the benefits to, the holders of Rights. Upon the delivery of a
certificate from an appropriate officer of the Company that states that the
proposed supplement or amendment is in compliance with the terms of this Section
27, and if requested by the Rights Agent, an opinion of counsel, the Rights
Agent shall execute such supplement or amendment. Notwithstanding anything
contained in this Agreement to the contrary, (i) no supplement or amendment
shall be made that changes the Redemption Price, the Final Expiration Date, the
Purchase Price or the number of Preferred Share Fractions for which a Right is
exercisable, and (ii) no supplement or amendment that changes or increases the
obligations and duties of the Rights Agent under this Agreement shall be
effective without the consent of the Rights Agent. Prior to the Distribution
Date, the interests of the beneficial owners of Rights shall be deemed
coincident with the interests of the holders of Common Shares.

            SECTION 28. Successors. All the covenants and provisions of this
Agreement by or for the benefit of the Company or the Rights Agent shall bind
and inure to the benefit of their respective successors and assigns hereunder.

            SECTION 29. Determinations and Actions by the Board of Directors,
etc. For all purposes of this Agreement, any calculation of the number of Common
Shares outstanding at any particular time, including for purposes of determining
the particular percentage of such outstanding Common Shares of which any Person
is the Beneficial Owner, shall be made in accordance with the last sentence of
Rule 13d-3(d)(1)(i) of the General Rules and Regulations under the Exchange Act.
The Board of Directors of the Company shall have the exclusive power and
authority to administer this Agreement and to exercise all rights and powers
specifically granted to the Board or to the Company, or as may be necessary or
advisable in the administration of this Agreement, including, without
limitation, the right and power to (i) interpret the provisions of this
Agreement, and (ii) make all determinations deemed necessary or advisable for
the administration of this Agreement (including a determination to redeem or not
redeem the Rights or to amend or supplement the Agreement). All such actions,
calculations, interpretations and determinations (including, for purposes of
clause (y) below, all omissions with respect to the foregoing) that are done or
made by the Board in good faith, shall (x) be final, conclusive and binding on
the Company, the Rights Agent, the holders of the Rights and all other Persons,
and (y) not subject the Board to any liability to the holders of the Rights. For
purposes of this Agreement, the Rights Agent shall be allowed to assume that all
such actions, calculations, interpretations and determinations have been done or
made by the Board in good faith.

            SECTION 30. Benefits of this Agreement. Nothing in this Agreement
shall be construed to give to any Person other than the Company, the Rights
Agent and the registered holders of the Rights Certificates (and, prior to the
Distribution Date, registered holders of the Common Shares) any legal or
equitable right, remedy or claim under this Agreement; but this 


                                     - 40 -
<PAGE>   44
Agreement shall be for the sole and exclusive benefit of the Company, the Rights
Agent and the registered holders of the Rights Certificates (and, prior to the
Distribution Date, registered holders of the Common Shares).

            SECTION 31. Severability. If any term, provision, covenant or
restriction of this Agreement is held by a court of competent jurisdiction or
other authority to be invalid, void or unenforceable for any purpose or under
any set of circumstances or as applied to any Person, such invalid, void or
unenforceable term, provision, covenant or restriction shall continue in effect
to the maximum extent possible for all other purposes, under all other
circumstances and as applied to all other Persons; and the remainder of the
terms, provisions, covenants and restrictions of this Agreement shall remain in
full force and effect and shall in no way be affected, impaired or invalidated;
provided, however, that notwithstanding anything in this Agreement to the
contrary, if any such term, provision, covenant or restriction is held by such
court or authority to be invalid, void or unenforceable and the Board of
Directors of the Company determines in its good faith judgment that severing the
invalid language from this Agreement would adversely affect the purpose or
effect of this Agreement, the right of redemption set forth in Section 23 hereof
shall be reinstated and shall not expire until the Close of Business on the
tenth day following the date of such determination by the Board of Directors.
Without limiting the foregoing, if any provisions requiring that a determination
be made by less than the entire Board (or at a time or with the concurrence of a
group of directors consisting of less than the entire Board) is held by a court
of competent jurisdiction or other authority to be invalid, void or
unenforceable, such determination shall then be made by the Board in accordance
with applicable law and the Company's Certificate of Incorporation and by-laws.

            SECTION 32. Governing Law. This Agreement, each Right and each
Rights Certificate issued hereunder shall be deemed to be a contract made under
the laws of the State of Delaware and for all purposes shall be governed by and
construed in accordance with the laws of such jurisdiction applicable to
contracts made and to be performed entirely within such jurisdiction; except
that all provisions regarding the rights, duties and obligations of the Rights
Agent shall by governed by and construed in accordance with the laws of the
State of New York applicable to contracts made and to be performed entirely
within such jurisdiction.

            SECTION 33. Counterparts. This Agreement may be executed in any
number of counterparts and each of such counterparts shall for all purposes be
deemed to be an original, and all such counterparts shall together constitute
but one and the same instrument.

            SECTION 34. Descriptive Headings. Descriptive headings of the
several Sections of this Agreement are inserted for convenience only and shall
not control or affect the meaning or construction of any of the provisions
hereof.


                                     - 41 -
<PAGE>   45
      IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
duly executed as of the day and year first above written.


                                    CMAC INVESTMENT CORPORATION


                                    By:_____________________________________
                                       Name: Howard S. Yaruss
                                       Title:Senior Vice President


                                    THE BANK OF NEW YORK


                                    By:_____________________________________
                                       Name:
                                       Title:


                                     - 42 -
<PAGE>   46
                                                                       EXHIBIT A


                     RESOLUTION OF THE BOARD OF DIRECTORS OF
                           CMAC INVESTMENT CORPORATION
                          ESTABLISHING AND DESIGNATING
                 SERIES A JUNIOR PARTICIPATING PREFERRED SHARES
                       AS A SERIES OF THE PREFERRED STOCK


RESOLVED, that pursuant to the authority expressly vested in the Board of
Directors of CMAC Investment Corporation(the "Corporation") by Article Fourth of
the Certificate of Incorporation of the Corporation, the Board of Directors
hereby fixes and determines the voting rights, designations, preferences,
qualifications, privileges, limitations, restrictions, options, conversion
rights and other special or relative rights of the first series of the Series
Preferred Stock, par value $.001 per share, which shall consist of 100,000
shares and shall be designated as Series A Junior Participating Preferred Shares
(the "Series A Preferred Shares").

Special Terms of the Series A Preferred Shares

            SECTION 1. Dividends and Distributions.

            (a) The rate of dividends payable per share of Series A Preferred
Shares on the first day of January, April, July and October in each year or such
other quarterly payment date as shall be specified by the Board of Directors
(each such date being referred to herein as a "Quarterly Dividend Payment
Date"), commencing on the first Quarterly Dividend Payment Date after the first
issuance of a share or fraction of a share of the Series A Preferred Shares,
shall be (rounded to the nearest cent) equal to the greater of (i) $10.00 or
(ii) subject to the provision for adjustment hereinafter set forth, 1,000 times
the aggregate per share amount of all cash dividends, and 1,000 times the
aggregate per share amount (payable in cash, based upon the fair market value at
the time the non-cash dividend or other distribution is declared or paid as
determined in good faith by the Board of Directors) of all non-cash dividends or
other distributions other than a dividend payable in shares of Common Stock or a
subdivision of the outstanding shares of Common Stock (by reclassification or
otherwise), declared on the Common Stock, $.001 par value per share, of the
Corporation since the immediately preceding Quarterly Dividend Payment Date, or,
with respect to the first Quarterly Dividend Payment Date, since the first
issuance of any share or fraction of a share of the Series A Preferred Shares.
Dividends on the Series A Preferred Shares shall be paid out of funds legally
available for such purpose. In the event the Corporation shall at any time after
April 14, 1998 (the "Rights Declaration Date") (i) declare any dividend on
Common Stock payable in shares of Common Stock, (ii) subdivide the outstanding
shares of Common Stock, or (iii) combine the outstanding shares of Common Stock
into a smaller number of shares, then in each such case the amounts to which
holders of Series A Preferred Shares were entitled immediately prior to such
event under clause (ii) of the preceding sentence shall be adjusted by
multiplying each such amount by a fraction the numerator of which is the number
of shares of Common Stock outstanding immediately after such event and the
denominator of which


                                       A-1
<PAGE>   47
is the number of shares of Common Stock that were outstanding immediately prior
to such event.

            (b) Dividends shall begin to accrue and be cumulative on outstanding
Series A Preferred Shares from the Quarterly Dividend Payment Date next
preceding the date of issue of such Series A Preferred Shares, unless the date
of issue of such shares is prior to the record date for the first Quarterly
Dividend Payment Date, in which case dividends on such shares shall begin to
accrue from the date of issue of such shares, or unless the date of issue is a
Quarterly Dividend Payment Date or is a date after the record date for the
determination of holders of Series A Preferred Shares entitled to receive a
quarterly dividend and before such Quarterly Dividend Payment Date, in either of
which events such dividends shall begin to accrue and be cumulative from such
quarterly Dividend Payment Date. Accrued but unpaid dividends shall not bear
interest. Dividends paid on the Series A Preferred Shares in an amount less than
the total amount of such dividends at the time accrued and payable on such
shares shall be allocated pro rata on a share-by-share basis among all such
shares at the time outstanding.

            SECTION 2. Voting Rights. In addition to any other voting rights
required by law, the holders of Series A Preferred Shares shall have the
following voting rights:

            (a) Subject to the provision for adjustment hereinafter set forth,
each Series A Preferred Share shall entitle the holder thereof to 1,000 votes on
all matters submitted to a vote of the stockholders of the Corporation. In the
event the Corporation shall at any time after the Rights Declaration Date (i)
declare any dividend on Common Stock payable in shares of Common Stock, (ii)
subdivide the outstanding shares of Common Stock, or (iii) combine the
outstanding shares of Common Stock into a smaller number of shares, then in each
such case the number of votes per share to which holders of Series A Preferred
Shares were entitled immediately prior to such event shall be adjusted by
multiplying such number by a fraction the numerator of which is the number of
shares of Common Stock outstanding immediately after such event and the
denominator of which is the number of shares of Common Stock that were
outstanding immediately prior to such event.

            (b) In the event that dividends upon the Series A Preferred Shares
shall be in arrears to an amount equal to six full quarterly dividends thereon,
the holders of such Series A Preferred Shares shall become entitled to the
extent hereinafter provided to vote noncumulatively at all elections of
directors of the Corporation, and to receive notice of all stockholders'
meetings to be held for such purpose. At such meetings, to the extent that
directors are being elected, the holders of such Series A Preferred Shares
voting as a class shall be entitled solely to elect two members of the Board of
Directors of the Corporation; and all other directors of the Corporation shall
be elected by the other stockholders of the Corporation entitled to vote in the
election of directors. Such voting rights of the holders of such Series A
Preferred Shares shall continue until all accumulated and unpaid dividends
thereon shall have been paid or funds sufficient therefor set aside, whereupon
all such voting rights of the holders of shares of such series shall cease, 


                                       A-2
<PAGE>   48
subject to being again revived from time to time upon the reoccurrence of the
conditions above described as giving rise thereto.

            At any time when such right to elect directors separately as a class
shall have so vested, the Corporation may, and upon the written request of the
holders of record of not less than 15% of the then outstanding total number of
shares of all the Series A Preferred Shares having the right to elect directors
in such circumstances shall, call a special meeting of holders of such Series A
Preferred Shares for the election of directors. In the case of such a written
request, such special meeting shall be held within ninety (90) days after the
delivery of such request, and, in either case, at the place and upon the notice
provided by law and in the By-laws of the Corporation; provided, that the
Corporation shall not be required to call such a special meeting if such request
is received less than one hundred twenty (120) days before the date fixed for
the next ensuing annual or special meeting of stockholders of the Corporation.
Upon the mailing of the notice of such special meeting to the holders of such
Series A Preferred Shares, or, if no such meeting be held, then upon the mailing
of the notice of the next annual or special meeting of stockholders for the
election of directors, the number of directors of the Corporation shall, ipso
facto, be increased to the extent, but only to the extent, necessary to provide
sufficient vacancies to enable the holders of such Series A Preferred Shares to
elect the two directors hereinabove provided for, and all such vacancies shall
be filled only by vote of the holders of such Series A Preferred Shares as
hereinabove provided. Whenever the number of directors of the Corporation shall
have been increased, the number as so increased may thereafter be further
increased or decreased in such manner as may be permitted by the By-laws and
without the vote of the holders of Series A Preferred Shares, provided that no
such action shall impair the right of the holders of Series A Preferred Shares
to elect and to be represented by two directors as herein provided.

            So long as the holders of Series A Preferred Shares are entitled
hereunder to voting rights, any vacancy in the Board of Directors caused by the
death or resignation of any director elected by the holders of Series A
Preferred Shares, shall, until the next meeting of stockholders for the election
of directors, in each case be filled by the remaining director elected by the
holders of Series A Preferred Shares having the right to elect directors in such
circumstances.

            Upon termination of the voting rights of the holders of any series
of Series A Preferred Shares the terms of office of all persons who shall have
been elected directors of the Corporation by vote of the holders of Series A
Preferred Shares or by a director elected by such holders shall forthwith
terminate.

            (c) Except as otherwise provided herein, in the Certificate of
Incorporation of the Corporation or by law, the holders of Series A Preferred
Shares and the holders of Common Stock (and the holders of shares of any other
series or class entitled to vote thereon) shall vote together as one class on
all matters submitted to a vote of stockholders of the Corporation.


                                       A-3
<PAGE>   49
            SECTION 3. Reacquired Shares. Any Series A Preferred Shares
purchased or otherwise acquired by the Corporation in any manner whatsoever
shall be retired and canceled promptly after the acquisition thereof. All such
shares shall upon their cancellation become authorized but unissued Series
Preferred Stock and may be reissued as part of a new series of Series Preferred
Stock to be created by resolution or resolutions of the Board of Directors.

            SECTION 4. Liquidation, Dissolution or Winding Up. In the event of
any voluntary or involuntary liquidation, dissolution or winding up of the
Corporation, the holders of Series A Preferred Shares shall be entitled to
receive the greater of (a) $100.00 per share, plus accrued dividends to the date
of distribution, whether or not earned or declared, or (b) an amount per share,
subject to the provision for adjustment hereinafter set forth, equal to 1,000
times the aggregate amount to be distributed per share to holders of Common
Stock. In the event the Corporation shall at any time after the Rights
Declaration Date (i) declare any dividend on Common Stock payable in shares of
Common Stock, (ii) subdivide the outstanding shares of Common Stock, or (iii)
combine the outstanding shares of Common Stock into a smaller number of shares,
then in each such case the amount to which holders of Series A Preferred Shares
were entitled immediately prior to such event pursuant to clause (b) of the
preceding sentence shall be adjusted by multiplying such amount by a fraction
the numerator of which is the number of shares of Common Stock outstanding
immediately after such event and the denominator of which is the number of
shares of Common Stock that were outstanding immediately prior to such event.

            SECTION 5. Consolidation, Merger, etc. In case the Corporation shall
enter into any consolidation, merger, combination or other transaction in which
the shares of Common Stock are exchanged for or changed into other stock or
securities, cash and/or any other property, then in any such case the Series A
Preferred Shares shall at the same time be similarly exchanged or changed in an
amount per share (subject to the provision for adjustment hereinafter set forth)
equal to 1,000 times the aggregate amount of stock, securities, cash and/or any
other property (payable in kind), as the case may be, into which or for which
each share of Common Stock is changed or exchanged. In the event the Corporation
shall at any time after the Rights Declaration Date (i) declare any dividend on
Common Stock payable in shares of Common Stock, (ii) subdivide the outstanding
shares of Common Stock, or (iii) combine the outstanding shares of Common Stock
into a smaller number of shares, then in each such case the amount set forth in
the preceding sentence with respect to the exchange or change of shares of
Series A Preferred Shares shall be adjusted by multiplying such amount by a
fraction the numerator of which is the number of shares of Common Stock
outstanding immediately after such event and the denominator of which is the
number of shares of Common Stock that were outstanding immediately prior to such
event.


                                       A-4
<PAGE>   50
            SECTION 6. No Redemption. The Series A Preferred Shares shall not be
redeemable.

            SECTION 7. Ranking. The Series A Preferred Shares shall rank junior
to all other series of the Corporation's Series Preferred Stock as to the
payment of dividends and the distribution of assets, unless the terms of any
such series shall provide otherwise.

            SECTION 8. Fractional Shares. Series A Preferred Shares may be
issued in fractions of a share which shall entitle the holder, in proportion to
such holder's fractional shares, to exercise voting rights, receive dividends,
participate in distributions and to have the benefit of all other rights of
holders of Series A Preferred Shares.


                                       A-5

<PAGE>   1
                                                                     EXHIBIT 5.1

                           MORGAN, LEWIS & BOCKIUS LLP
                               1701 Market Street
                        Philadelphia, Pennsylvania 19103


May 6, 1999


CMAC Investment Corporation
1601 Market Street
Philadelphia, PA 19103

Ladies and Gentlemen:

We have acted as counsel to CMAC Investment Corporation, a Delaware corporation
(the "Company"), in connection with the registration of up to 14,444,600 shares
(the "Shares") of its Common Stock, par value $0.001 per share (the "Common
Stock"), on a registration statement on Form S-4 (the "Registration Statement")
filed pursuant to the Securities Act of 1933, as amended (the "Act").

We have examined the Registration Statement and such corporate records,
documents, statutes and decisions as we have deemed relevant in rendering this
opinion.

Based on the foregoing, it is our opinion that the Shares will be, when issued
in the manner and for the consideration contemplated in the Registration
Statement, validly issued, fully paid and nonassessable.

We hereby consent to the filing of this opinion as an exhibit to the
Registration Statement. In giving such consent, we do not thereby admit that we
come within the category of persons whose consent is required under Section 7 of
the Act or the rules or regulations of the Securities and Exchange Commission
thereunder.

Very truly yours,

/s/ Morgan, Lewis & Bockius LLP


<PAGE>   1
                                                                     Exhibit 8.1

                                  May 6, 1999

CMAC Investment Corporation
1601 Market Street
Philadelphia, Pennsylvania  19103

Ladies and Gentlemen:

Pursuant to an Agreement and Plan of Merger dated as of November 22, 1998 (the
"Merger Agreement") among Amerin Corporation, a Delaware corporation ("Amerin")
and CMAC Investment Corporation, a Delaware corporation ("CMAC"), Amerin will
merge with and into CMAC (the "Merger") and CMAC will change its name to Radian

We have acted as counsel to CMAC in connection with the Merger and in that
connection, you have requested our opinion as to the material federal income tax
consequences of the Merger to CMAC and certain holders of CMAC common stock. In
rendering our opinion, we have examined the Merger Agreement, the registration
statement of CMAC dated May 6, 1999 (the "Registration Statement"), the joint
proxy statement of Amerin and CMAC dated May 6, 1999 (the "Proxy Statement")
and such other documents and corporate records as we have deemed necessary or
appropriate. In addition, we have assumed (i) the Merger will be consummated in
the manner contemplated in the Proxy Statement and in accordance with the
provisions of the Merger Agreement, (ii) the statements concerning the Merger
set forth in the Proxy Statement are accurate and complete, and (iii)
representations made to us by Amerin and CMAC in their respective letters to us
dated today and provided to us for the purpose of issuing this opinion are
accurate and complete and will be accurate and complete as of the date the
Merger is effected.

<PAGE>   2

CMAC, Inc.
May 6, 1999
Page 2

Under current law and on the basis and subject to (i) the accuracy of the
statements and representations contained in the materials referred to above and
the above assumptions and (ii) our considerations of such other matters as we
have deemed necessary, in our opinion:

         (A) the merger of Amerin into CMAC will be treated for federal income
tax purposes as a reorganization within the meaning of Section 368(a) of the
Internal Revenue Code of 1986, as amended, (the "Code"), and Amerin and CMAC
will each be a party to the reorganization within the meaning of Section 368(b)
of the Code, and

         (B) holders of CMAC common stock will not recognize gain or loss for
United States federal income tax purposes as a result of the Merger; and

You have not requested, and we do not express, an opinion concerning any other
tax consequences of the Merger.

This opinion expresses our views only as to U.S. federal income tax laws in
effect as of the date hereof. It represents our best legal judgment as to the
matters addressed herein, but is not binding on the Internal Revenue Service or
the courts. Accordingly, no assurance can be given that the opinion expressed
herein, if contested, would be sustained by a court. Furthermore, the
authorities upon which we rely are subject to change either prospectively or
retroactively, and any change in such authorities or variation or difference in
the facts from those on which we rely and assume as correct, as set forth above,
might affect the conclusions stated herein.

This opinion is not to be used, circulated, quoted or otherwise referred to for
any purpose without our express written permission. We hereby consent to the
filing of this opinion as an exhibit to the Registration Statement and to the
reference to us in the section captioned "The Merger -- Material Federal Income
Tax Consequences" in the Proxy Statement constituting a part of the Registration
Statement. In giving this consent we do not hereby admit that we come within the
category of persons whose consent is required under Section 7 of the Securities
Act of 1933, as amended, or the rules and regulations of the Securities and
Exchange Commission thereunder.

                                                 Very truly yours,

                                                 /s/ Morgan, Lewis & Bockius LLP

<PAGE>   1
                                                           Exhibit 8.2


                                                                     May 6, 1999

Amerin Corporation
200 East Randolph Drive
49th Floor
Chicago, Illinois 60601

Dear Ladies and Gentlemen:

         We have acted as counsel for Amerin Corporation, a Delaware corporation
("Amerin"), in connection with the proposed merger (the "Merger") of Amerin with
and into CMAC Investment Corporation, a Delaware corporation ("CMAC"), pursuant
to an Agreement and Plan of Merger dated as of November 22, 1998 (the "Merger
Agreement") between Amerin and CMAC. CMAC will change its name to Radian Group
Inc. ("Radian") in connection with the Merger.1

         In that connection, you have requested our opinion regarding the
material United States federal income tax consequences of the Merger. In
providing our opinion, we have examined the Merger Agreement, the joint proxy
statement of Amerin and CMAC dated May 6, 1999 (the "Joint Proxy Statement"),
the registration statement of CMAC dated May 6, 1999 with respect to the
Radian common stock to be issued to the stockholders of Amerin in connection
with the Merger (the "Registration Statement"), and such other documents as we
have deemed necessary or appropriate for purposes of our opinion. In addition,
we have assumed that (i) the Merger will be consummated in the manner
contemplated by the Joint Proxy Statement and the Registration Statement and in
accordance with the provisions of the Merger Agreement, and (ii) the
representations made to us by Amerin and by CMAC in their respective letters to
us dated May 6, 1999 and delivered to us for purposes of our opinion are
accurate and complete.

<PAGE>   2

         Our opinion does not address all aspects of United States federal
income taxation that may be relevant to a stockholder of Amerin in light of such
stockholder's particular circumstances. We have assumed that the stockholders of
Amerin are not subject to special rules, such as those that may be applicable to
stockholders that (i) are not citizens or residents of the United States, (ii)
are financial institutions, tax-exempt organizations, insurance companies or
dealers or brokers in securities, (iii) hold their stock as part of a hedge,
appreciated financial position, straddle or conversion transaction, or (iv)
acquired their Amerin common stock pursuant to the exercise of employee options
or otherwise as compensation.

         Based upon the foregoing, in our opinion, the Merger will be treated
for United States federal income tax purposes as a reorganization within the
meaning of Section 368(a) of the Internal Revenue Code of 1986, as amended (the
"Code"), and Amerin and CMAC will each be a party to such reorganization within
the meaning of Section 368(b) of the Code. Accordingly, for United States
federal income tax purposes:

         (i)      no gain or loss will be recognized by a stockholder of Amerin
                  upon its exchange of Amerin common stock for Radian common
                  stock pursuant to the Merger under Section 354 of the Code
                  (except to the extent such stockholder receives cash in lieu
                  of a fractional share of Radian common stock, as discussed
                  below);

         (ii)     the aggregate tax basis of Radian common stock received by a
                  stockholder of Amerin as a result of the Merger will be the
                  same as such stockholder's aggregate tax basis in the Amerin
                  common stock surrendered in the exchange (reduced by any such
                  tax basis allocable to a fractional share of Radian common
                  stock for which cash is received by such stockholder);

         (iii)    the holding period of the Radian common stock received by a
                  stockholder of Amerin as result of the Merger will include the
                  period during which such stockholder held the Amerin common
                  stock surrendered in the exchange;

         (iv)     a stockholder of Amerin that receives cash in lieu of a
                  fractional share of Radian common stock will recognize gain or
                  loss (A) measured by the difference between the amount of cash
                  received and the portion of the tax basis of the Amerin common
                  stock allocable to such fractional share, (B) that generally
                  will be capital gain or loss if such Amerin common stock has
                  been held as a capital asset, and (C) that will be long-term
                  capital gain or loss if such Amerin common stock has been held
                  for more than one year as of the date on which the Merger is
                  effected (the "Closing Date");

- --------

         1 All references in this opinion to CMAC will include a reference to
Radian.

<PAGE>   3

         (v)      a stockholder of Amerin that receives Radian common stock as a
                  result of the Merger will be required to (A) retain certain
                  records, and (B) file with its appropriate United States
                  federal income tax return a statement setting forth certain
                  facts relating to the Merger; and

         (vi)     neither Amerin nor CMAC will recognize gain or loss as a
                  result of the Merger.

         The opinion expressed herein is based upon existing statutory,
regulatory and judicial authority, any of which may be changed at any time with
retroactive effect. Our opinion cannot be relied upon if there is a change in
applicable law between the date of such opinion and the Closing Date.

         In addition, our opinion is based solely on the documents that we have
examined, the additional information that we have obtained, and the statements
contained in the letters from Amerin and from CMAC referred to above, which we
have assumed will be true as of the Closing Date. Our opinion cannot be relied
upon if any of the facts pertinent to the United States federal income tax
treatment of the Merger stated in such documents or in such additional
information is, or later becomes, inaccurate, or if any of the statements
contained in the letters from Amerin or from CMAC referred to above is, or later
becomes, inaccurate. Finally, our opinion is limited to the tax matters
specifically covered hereby, and we have not been asked to address, nor have we
addressed, any other tax consequences of the Merger or the tax consequences of
any other transaction.

         This opinion is being provided solely for the benefit of Amerin and its
stockholders. No other person or party will be entitled to rely on this opinion.

         We consent to the filing of this opinion as an exhibit to the
Registration Statement and to the reference to Davis Polk & Wardwell in the
Joint Proxy Statement under the caption "The Merger -- Federal Income Tax
Consequences." In furnishing such consent, we do not concede that we are within
the category of persons whose consent is required under Section 7 of the
Securities Act of 1933, as amended, or the rules or regulations of the
Securities and Exchange Commission promulgated thereunder.

         Very truly yours,

         /s/ Davis Polk & Wardwell


<PAGE>   1
                                                                   Exhibit 10.33


                               AMENDMENT NO. 1 TO
                   AMERIN CORPORATION EQUITY AWARD AGREEMENTS


THIS AMENDMENT NO. 1, dated as of September 17, 1997 (the "Amendment"), by and
between Amerin Corporation, a Delaware corporation (the "Company"), and Roy J.
Kasmar (the "Participant"), amends (i) the Amerin Corporation Equity Award
Agreement (the "First Agreement"), dated as of May 20, 1996, by and between the
Company and the Participant, (ii) the Amerin Corporation Equity Award Agreement
(the "Second Agreement"), dated as of January 17, 1997, by and between the
Company and the Participant, and (iii) the Amerin Corporation Equity Award
Agreement (the "Third Agreement"), dated as of May 1, 1997, by and between the
Company and the Participant, (the First, Second and Third Agreements being
hereinafter referred to collectively as the "Agreements").

                                    RECITALS:

WHEREAS, the Corporation has previously adopted the USMIC Corporation 1992
Long-Term Stock Incentive Plan and has amended and restated such Plan as of
November 1, 1995 as the Amerin Corporation 1992 Long-Term Stock Incentive Plan
(the "Plan"), which Plan is incorporated herein by reference and made a part of
the Agreements and this Amendment; and

WHEREAS, pursuant to the Plan and the Agreements the Company has previously
granted the Options (as defined below) and Share Grants (as defined below) to
the Participant as an inducement to enter into and remain in the employment of
the Company's wholly-owned subsidiary, Amerin Guaranty Corporation ("Amerin")
and as an increased incentive to contribute to the Company's further success and
prosperity; and

WHEREAS, the Participant is a senior executive of Amerin and has made and is
expected to continue to make major contributions to the short- and long-term
profitability, growth and financial strength of the Company;

WHEREAS, the Company recognizes that, as is the case for most publicly held
companies, the possibility of a Change in Control (as defined below) exists;

WHEREAS, the Company desires to assure itself of both present and future
continuity of management and desires to establish certain minimum severance
benefits for certain of its senior executives, including the Participant,
applicable in the event of a Change in Control;

WHEREAS, the Company wishes to ensure that its senior executives are not
practically disabled from discharging their duties in respect of a proposed or
actual transaction involving a Change in Control; and

WHEREAS, the Company desires to provide additional inducement for the
Participant to continue to remain in the ongoing employ of Amerin;

NOW, THEREFORE, the Company and the Participant agree that the Agreement shall
be amended as follows:
<PAGE>   2
Capitalized terms not otherwise defined herein shall have the same meanings
specified in the Agreement, and capitalized terms not otherwise defined herein
or in the Agreements shall have the meanings specified in the Plan.

1.       Certain Defined Terms. In addition to terms defined elsewhere herein,
         the following terms have the following meanings when used in this
         Agreement with initial capital letters:

         (a)      "Board" means the Board of Directors of the Company.

         (b)      "Change in Control" means the occurrence during the Term of
                  any of the following events:

                  (i)      The Company is merged, consolidated or reorganized
                           into or with another corporation or other legal
                           person, and as a result of such merger, consolidation
                           or reorganization less than a majority of the
                           combined voting power of the then-outstanding Voting
                           Stock of such corporation or person immediately after
                           such transaction are held in the aggregate by the
                           holders of Voting Stock of the Company immediately
                           prior to such transaction; or

                  (ii)     The Company sells or otherwise transfers all or
                           substantially all of its assets to another
                           corporation or other legal person, and as a result of
                           such sale or transfer less than a majority of the
                           combined voting power of the then-outstanding Voting
                           Stock of such corporation or person immediately after
                           such sale or transfer is held in the aggregate by the
                           holders of Voting Stock of the Company immediately
                           prior to such sale or transfer; or

                  (iii)    There is a report filed on Schedule 13D or Schedule
                           14D-1 (or any successor schedule, form or report),
                           each as promulgated pursuant to the Exchange Act,
                           disclosing that any person (as the term "person" is
                           used in Section 13(d)(3) or Section 14(d)(2) of the
                           Exchange Act, but not including any Original
                           Investor) has become the beneficial owner (as the
                           term "beneficial owner" is defined under Rule 13d-3
                           or any successor rule or regulation promulgated under
                           the Exchange Act) of securities representing 25% or
                           more of the combined voting power of the
                           then-outstanding Voting Stock of the Company.

                  Notwithstanding the foregoing provisions of Section 1(b)(iii),
                  unless otherwise determined in a specific case by majority
                  vote of the Board, a "Change in Control" shall not be deemed
                  to have occurred for purposes of Section 1(b)(iii) solely
                  because (A) the Company, (B) a Subsidiary, or (C) any
                  Company-sponsored employee stock ownership plan or any other
<PAGE>   3
                  employee benefit plan of the Company or any Subsidiary either
                  files or becomes obligated to file a report or a proxy
                  statement under or in response to Schedule 13D, Schedule
                  14D-1, Form 8-K or Schedule 14A (or any successor schedule,
                  form or report or item therein) under the Exchange Act
                  disclosing beneficial ownership by it of shares of Voting
                  Stock, whether in excess of 25% or otherwise, or because the
                  Company reports that a change in control of the Company has
                  occurred or will occur in the future by reason of such
                  beneficial ownership.

         (c)      "Exchange Act" means the Securities Exchange Act of 1934, as
                  amended.

         (d)      "Options" means (i) the Option (as defined in the First
                  Agreement) granted under the First Agreement, (ii) the Option
                  (as defined in the Second Agreement) granted under the Second
                  Agreement, and (iii) the Option (as defined in the Third
                  Agreement) granted under the Third Agreement.

         (e)      "Original Investor" means any of the five institutional
                  investors which owned any capital stock of the Company as of
                  November 1, 1995.

         (f)      "Share Grants" means (i) the Share Grant (as defined in the
                  First Agreement) granted under the First Agreement and (ii)
                  the Share Grant (as defined in the Second Agreement) granted
                  under the Second Agreement.

         (g)      "Subsidiary" means an entity in which the Company directly or
                  indirectly beneficially owns 50% or more of the outstanding
                  Voting Stock.

         (h)      "Term" means the period commencing as of the date hereof and
                  expiring as of the later of (i) the close of business on
                  December 31, 2002, or (ii) the expiration of the Coverage
                  Period; provided, however, that (A) commencing on January 1,
                  2002 and each January 1 thereafter, the term of this Agreement
                  will automatically be extended for an additional year unless,
                  not later than September 30 of the immediately preceding year,
                  the Company or the Executive shall have given notice that it
                  or the Executive, as the case may be, does not wish to have
                  the Term extended and (B) subject to the last sentence of
                  Section 5, if, prior to a Change in Control, the Executive
                  ceases for any reason to be an employee of the Company and any
                  Subsidiary, thereupon without further action the Term shall be
                  deemed to have expired and this Agreement will immediately
                  terminate and be of no further effect. For purposes of this
                  Section 1(g), the Executive shall not be deemed to have ceased
                  to be an employee of the Company and any Subsidiary by reason
                  of the transfer of Executive's employment between the Company
                  and any Subsidiary, or among any Subsidiaries.

         (i)      "Voting Stock" means securities entitled to vote generally in
                  the election of directors.
<PAGE>   4
2.       Operation of Agreement. This Agreement will be effective and binding
         immediately upon its execution, but, anything in this Agreement to the
         contrary notwithstanding, this Agreement will not be operative unless
         and until a Change in Control occurs. Upon the occurrence of a Change
         in Control at any time during the Term, without further action, this
         Agreement shall become immediately operative.

3.       Acceleration of Vesting and Lapse of Restrictions on Transfer.

         (a)      Following the occurrence of a Change in Control, any portion
                  of the Options not otherwise exercisable as of the date of
                  such Change in Control shall become immediately exercisable,
                  and any restrictions on transfer imposed by the Agreements
                  with respect to the Share Grants and in effect on the date of
                  such Change in Control shall immediately lapse as of the date
                  of such Change in Control; provided, however, that this
                  Section 3(a) shall be of no force and effect if such
                  acceleration of exercisability would cause the Company to be
                  unable to use the pooling of interests method of accounting in
                  connection with the transactions resulting in such Change in
                  Control.

         (b)      Notwithstanding any provision of this Agreement to the
                  contrary, the parties' respective rights and obligations under
                  this Section 3 and under Section 4 will survive any
                  termination or expiration of this Agreement or the termination
                  of the Participant's employment following a Change in Control
                  for any reason whatsoever.

4.       Legal Fees and Expenses. It is the intent of the Company that the
         Participant not be required to incur legal fees and the related
         expenses associated with the interpretation, enforcement or defense of
         Participant's rights under this Agreement by litigation or otherwise
         because the cost and expense thereof would substantially detract from
         the benefits intended to be extended to the Participant hereunder.
         Accordingly, if it should appear to the Participant that the Company
         has failed to comply with any of its obligations under this Agreement
         or in the event that the Company or any other person takes or threatens
         to take any action to declare this Agreement void or unenforceable, or
         institutes any litigation or other action or proceeding designed to
         deny, or to recover from, the Participant the benefits provided or
         intended to be provided to the Participant hereunder, the Company
         irrevocably authorizes the Participant from time to time to retain
         counsel of Participant's choice, at the expense of the Company as
         hereafter provided, to advise and represent the Participant in
         connection with any such interpretation, enforcement or defense,
         including without limitation the initiation or defense of any
         litigation or other legal action, whether by or against the Company or
         any Director, officer, stockholder or other person affiliated with the
         Company, in any jurisdiction. Notwithstanding any existing or prior
         attorney-client relationship between the Company and such counsel, the
         Company irrevocably consents to the Participant's entering into an
         attorney-client relationship with such counsel, and in that 
<PAGE>   5
         connection the Company and the Participant agree that a confidential
         relationship shall exist between the Participant and such counsel.
         Without respect to whether the Participant prevails, in whole or in
         part, in connection with any of the foregoing, the Company will pay and
         be solely financially responsible for any and all attorneys' and
         related fees and expenses incurred by the Participant in connection
         with any of the foregoing.

5.       Employment Rights. Nothing expressed or implied in this Agreement will
         create any right or duty on the part of the Company or the Participant
         to have the Participant remain in the employment of the Company or any
         Subsidiary prior to or following any Change in Control. Any termination
         of employment of the Participant or the removal of the Participant from
         the office or position in the Company or any Subsidiary following the
         commencement of any discussion with a third person that ultimately
         results in a Change in Control shall be deemed to be a termination or
         removal of the Participant after a Change in Control for purposes of
         this Agreement.

6.       Withholding of Taxes. The Company may withhold from any amounts payable
         under this Agreement all federal, state, city or other taxes as the
         Company is required to withhold pursuant to any law or government
         regulation or ruling.

7.       Successors and Binding Agreement.

         (a)      The Company will require any successor (whether direct or
                  indirect, by purchase, merger, consolidation, reorganization
                  or otherwise) to all or substantially all of the business or
                  assets of the Company, by agreement in form and substance
                  satisfactory to the Participant, expressly to assume and agree
                  to perform this Agreement in the same manner and to the same
                  extent the Company would be required to perform if no such
                  succession had taken place. This Agreement will be binding
                  upon and inure to the benefit of the Company and any successor
                  to the Company, including without limitation any persons
                  acquiring directly or indirectly all or substantially all of
                  the business or assets of the Company whether by purchase,
                  merger, consolidation, reorganization or otherwise (and such
                  successor shall thereafter be deemed the "Company" for the
                  purposes of this Agreement), but will not otherwise be
                  assignable, transferable or delegable by the Company.

         (b)      This Agreement will inure to the benefit of and be enforceable
                  by the Participant's personal or legal representatives,
                  executors, administrators, successors, heirs, distributees and
                  legatees.

         (c)      This Agreement is personal in nature and neither of the
                  parties hereto shall, without the consent of the other,
                  assign, transfer or delegate this Agreement or any rights or
                  obligations hereunder except as expressly provided in Sections
                  7(a) and 7(b). Without limiting the generality or effect of
                  the foregoing, the Participant's rights hereunder will not be
                  assignable, 
<PAGE>   6
                  transferable or delegable, whether by pledge, creation of a
                  security interest, or otherwise, other than by a transfer by
                  Participant's will or by the laws of descent and distribution
                  and, in the event of any attempted assignment or transfer
                  contrary to this Section 7(c), the Company shall have no
                  liability to pay any amount so attempted to be assigned,
                  transferred or delegated.

8.       Notices. For all purposes of this Agreement, all communications,
         including without limitation notices, consents, requests or approvals,
         required or permitted to be given hereunder will be in writing and will
         be deemed to have been duly given when hand delivered or dispatched by
         electronic facsimile transmission (with receipt thereof orally
         confirmed), or five business days after having been mailed by United
         States registered or certified mail, return receipt requested, postage
         prepaid, or three business days after having been sent by a nationally
         recognized overnight courier service such as Federal Express, UPS, or
         Purolator, addressed to the Company (to the attention of the Secretary
         of the Company) at its principal executive office and to the
         Participant at his principal residence, or to such other address as any
         party may have furnished to the other in writing and in accordance
         herewith, except that notices of changes of address shall be effective
         only upon receipt.

9.       Governing Law. The validity, interpretation, construction and
         performance of this Agreement will be governed by and construed in
         accordance with the substantive laws of the State of Illinois, without
         giving effect to the principles of conflict of laws of such State.

10.      Validity. If any provision of this Agreement or the application of any
         provision hereof to any person or circumstances is held invalid,
         unenforceable or otherwise illegal, the remainder of this Agreement and
         the application of such provision to any other person or circumstances
         will not be affected, and the provision so held to be invalid,
         unenforceable or otherwise illegal will be reformed to the extent (and
         only to the extent) necessary to make it enforceable, valid or legal.

11.      Miscellaneous. No provision of this Agreement may be modified, waived
         or discharged unless such waiver, modification or discharge is agreed
         to in writing signed by the Participant and the Company. No waiver by
         either party hereto at any time of any breach by the other party hereto
         or compliance with any condition or provision of this Agreement to be
         performed by such other party will be deemed a waiver of similar or
         dissimilar provisions or conditions at the same or at any prior or
         subsequent time. No agreements or representations, oral or otherwise,
         expressed or implied with respect to the subject matter hereof have
         been made by either party which are not set forth expressly in this
         Agreement. References to Sections are to references to Sections of this
         Agreement.

12.      Application of Agreement. Except as expressly amended pursuant to this
         Amendment No. 1, all terms of the Agreements remain in full force and
         effect.
<PAGE>   7
13.      Counterparts. This Amendment No. 1 may be executed in one or more
         counterparts, each of which shall be deemed to be an original but all
         of which together will constitute one and the same agreement.

IN WITNESS WHEREOF, the Corporation, by its duly authorized officer, and the
Participant, have executed this Amendment No. 1 either together or in the form
of multiple counterparts hereof (each of which shall be deemed an original)
effective as of the date and year first above written.


                                       AMERIN CORPORATION


                                       By: /s/ Randolph C. Sailer II
                                          ---------------------------------
                                               Senior Vice President


                                       ROY J. KASMAR

                                       /s/ Roy J. Kasmar
                                       ------------------------------------



<PAGE>   1
                                                                   Exhibit 10.34


                     AMENDMENT NO. 1 TO RESTATED AND AMENDED
                   AMERIN CORPORATION EQUITY AWARD AGREEMENTS


THIS AMENDMENT NO. 1, dated as of September 17, 1997 (the "Amendment"), by and
between Amerin Corporation, a Delaware corporation (the "Company"), and Jerome
J. Selitto (the "Participant"), amends (i) the Restated and Amended Amerin
Corporation Equity Award Agreement (the "First Agreement"), dated as of December
1, 1995, by and between the Company and the Participant, and (ii) the Restated
and Amended Amerin Corporation Equity Award Agreement (the "Second Agreement"),
dated as of May 1, 1997, by and between the Company and the Participant (the
First Agreement and the Second Agreement being hereinafter referred to
collectively as the "Agreements").

                                    RECITALS:

WHEREAS, the Corporation has previously adopted the USMIC Corporation 1992
Long-Term Stock Incentive Plan and has amended and restated such Plan as of
November 1, 1995 as the Amerin Corporation 1992 Long-Term Stock Incentive Plan
(the "Plan"), which Plan is incorporated herein by reference and made a part of
the Agreements and this Amendment; and

WHEREAS, pursuant to the Plan and the Agreements the Company has previously
granted the Options (as defined below) to the Participant as an inducement to
enter into and remain in the employment of the Company's wholly-owned
subsidiary, Amerin Guaranty Corporation ("Amerin") and as an increased incentive
to contribute to the Company's further success and prosperity; and

WHEREAS, the Participant is a senior executive of Amerin and has made and is
expected to continue to make major contributions to the short- and long-term
profitability, growth and financial strength of the Company;

WHEREAS, the Company recognizes that, as is the case for most publicly held
companies, the possibility of a Change in Control (as defined below) exists;

WHEREAS, the Company desires to assure itself of both present and future
continuity of management and desires to establish certain minimum severance
benefits for certain of its senior executives, including the Participant,
applicable in the event of a Change in Control;

WHEREAS, the Company wishes to ensure that its senior executives are not
practically disabled from discharging their duties in respect of a proposed or
actual transaction involving a Change in Control; and

WHEREAS, the Company desires to provide additional inducement for the
Participant to continue to remain in the ongoing employ of Amerin;

NOW, THEREFORE, the Company and the Participant agree that the Agreement shall
be amended as follows:
<PAGE>   2
Capitalized terms not otherwise defined herein shall have the same meanings
specified in the Agreement, and capitalized terms not otherwise defined herein
or in the Agreements shall have the meanings specified in the Plan.

1.       Certain Defined Terms. In addition to terms defined elsewhere herein,
         the following terms have the following meanings when used in this
         Agreement with initial capital letters:

         (a)      "Board" means the Board of Directors of the Company.

         (b)      "Change in Control" means the occurrence during the Term of
                  any of the following events:

                  (i)      The Company is merged, consolidated or reorganized
                           into or with another corporation or other legal
                           person, and as a result of such merger, consolidation
                           or reorganization less than a majority of the
                           combined voting power of the then-outstanding Voting
                           Stock of such corporation or person immediately after
                           such transaction are held in the aggregate by the
                           holders of Voting Stock of the Company immediately
                           prior to such transaction; or

                  (ii)     The Company sells or otherwise transfers all or
                           substantially all of its assets to another
                           corporation or other legal person, and as a result of
                           such sale or transfer less than a majority of the
                           combined voting power of the then-outstanding Voting
                           Stock of such corporation or person immediately after
                           such sale or transfer is held in the aggregate by the
                           holders of Voting Stock of the Company immediately
                           prior to such sale or transfer; or

                  (iii)    There is a report filed on Schedule 13D or Schedule
                           14D-1 (or any successor schedule, form or report),
                           each as promulgated pursuant to the Exchange Act,
                           disclosing that any person (as the term "person" is
                           used in Section 13(d)(3) or Section 14(d)(2) of the
                           Exchange Act) other than an Original Investor) has
                           become the beneficial owner (as the term "beneficial
                           owner" is defined under Rule 13d-3 or any successor
                           rule or regulation promulgated under the Exchange
                           Act) of securities representing 25% or more of the
                           combined voting power of the then-outstanding Voting
                           Stock of the Company.

                  Notwithstanding the foregoing provisions of Section 1(b)(iii),
                  unless otherwise determined in a specific case by majority
                  vote of the Board, a "Change in Control" shall not be deemed
                  to have occurred for purposes of Section 1(b)(iii) solely
                  because (A) the Company, (B) a Subsidiary, or (C) any
                  Company-sponsored employee stock ownership plan or any other
                  employee benefit plan of the Company or any Subsidiary either
                  files or 
<PAGE>   3
                  becomes obligated to file a report or a proxy statement under
                  or in response to Schedule 13D, Schedule 14D-1, Form 8-K or
                  Schedule 14A (or any successor schedule, form or report or
                  item therein) under the Exchange Act disclosing beneficial
                  ownership by it of shares of Voting Stock, whether in excess
                  of 25% or otherwise, or because the Company reports that a
                  change in control of the Company has occurred or will occur in
                  the future by reason of such beneficial ownership.

         (c)      "Exchange Act" means the Securities Exchange Act of 1934, as
                  amended.

         (d)      "Options" means (i) the First Option and Second Option (as
                  defined in the First Agreement) granted under the First
                  Agreement and (ii) the Option (as defined in the Second
                  Agreement) granted under the Second Agreement.

         (e)      "Original Investor" means any of the five institutional
                  investors which owned any capital stock of the Company as of
                  November 1, 1995.

         (f)      "Subsidiary" means an entity in which the Company directly or
                  indirectly beneficially owns 50% or more of the outstanding
                  Voting Stock.

         (g)      "Term" means the period commencing as of the date hereof and
                  expiring as of the later of (i) the close of business on
                  December 31, 2002, or (ii) the expiration of the Coverage
                  Period; provided, however, that (A) commencing on January 1,
                  2002 and each January 1 thereafter, the term of this Agreement
                  will automatically be extended for an additional year unless,
                  not later than September 30 of the immediately preceding year,
                  the Company or the Executive shall have given notice that it
                  or the Executive, as the case may be, does not wish to have
                  the Term extended and (B) subject to the last sentence of
                  Section 5, if, prior to a Change in Control, the Executive
                  ceases for any reason to be an employee of the Company and any
                  Subsidiary, thereupon without further action the Term shall be
                  deemed to have expired and this Agreement will immediately
                  terminate and be of no further effect. For purposes of this
                  Section 1(f), the Executive shall not be deemed to have ceased
                  to be an employee of the Company and any Subsidiary by reason
                  of the transfer of Executive's employment between the Company
                  and any Subsidiary, or among any Subsidiaries.

         (h)      "Voting Stock" means securities entitled to vote generally in
                  the election of directors.

2.       Operation of Agreement. This Agreement will be effective and binding
         immediately upon its execution, but, anything in this Agreement to the
         contrary notwithstanding, this Agreement will not be operative unless
         and until a Change in Control occurs. Upon the occurrence of a Change
         in Control at any time during the Term, without further action, this
         Agreement shall become immediately operative.
<PAGE>   4
3.       Acceleration of Vesting.

         (a)      Following the occurrence of a Change in Control, any portion
                  of the Options not otherwise exercisable as of the date of
                  such change in Control shall become immediately exercisable;
                  provided, however, that this Section 3(a) shall be of no force
                  and effect if such acceleration of exercisability would cause
                  the Company to be unable to use the pooling of interests
                  method of accounting in connection with the transactions
                  resulting in such Change in Control.

         (b)      Notwithstanding any provision of this Agreement to the
                  contrary, the parties' respective rights and obligations under
                  this Section 3 and under Section 4 will survive any
                  termination or expiration of this Agreement or the termination
                  of the Participant's employment following a Change in Control
                  for any reason whatsoever.

4.       Legal Fees and Expenses. It is the intent of the Company that the
         Participant not be required to incur legal fees and the related
         expenses associated with the interpretation, enforcement or defense of
         Participant's rights under this Agreement by litigation or otherwise
         because the cost and expense thereof would substantially detract from
         the benefits intended to be extended to the Participant hereunder.
         Accordingly, if it should appear to the Participant that the Company
         has failed to comply with any of its obligations under this Agreement
         or in the event that the Company or any other person takes or threatens
         to take any action to declare this Agreement void or unenforceable, or
         institutes any litigation or other action or proceeding designed to
         deny, or to recover from, the Participant the benefits provided or
         intended to be provided to the Participant hereunder, the Company
         irrevocably authorizes the Participant from time to time to retain
         counsel of Participant's choice, at the expense of the Company as
         hereafter provided, to advise and represent the Participant in
         connection with any such interpretation, enforcement or defense,
         including without limitation the initiation or defense of any
         litigation or other legal action, whether by or against the Company or
         any Director, officer, stockholder or other person affiliated with the
         Company, in any jurisdiction. Notwithstanding any existing or prior
         attorney-client relationship between the Company and such counsel, the
         Company irrevocably consents to the Participant's entering into an
         attorney-client relationship with such counsel, and in that connection
         the Company and the Participant agree that a confidential relationship
         shall exist between the Participant and such counsel. Without respect
         to whether the Participant prevails, in whole or in part, in connection
         with any of the foregoing, the Company will pay and be solely
         financially responsible for any and all attorneys' and related fees and
         expenses incurred by the Participant in connection with any of the
         foregoing.
<PAGE>   5
5.       Employment Rights. Nothing expressed or implied in this Agreement will
         create any right or duty on the part of the Company or the Participant
         to have the Participant remain in the employment of the Company or any
         Subsidiary prior to or following any Change in Control. Any termination
         of employment of the Participant or the removal of the Participant from
         the office or position in the Company or any Subsidiary following the
         commencement of any discussion with a third person that ultimately
         results in a Change in Control shall be deemed to be a termination or
         removal of the Participant after a Change in Control for purposes of
         this Agreement.

6.       Withholding of Taxes. The Company may withhold from any amounts payable
         under this Agreement all federal, state, city or other taxes as the
         Company is required to withhold pursuant to any law or government
         regulation or ruling.

7.       Successors and Binding Agreement.

         (a)      The Company will require any successor (whether direct or
                  indirect, by purchase, merger, consolidation, reorganization
                  or otherwise) to all or substantially all of the business or
                  assets of the Company, by agreement in form and substance
                  satisfactory to the Participant, expressly to assume and agree
                  to perform this Agreement in the same manner and to the same
                  extent the Company would be required to perform if no such
                  succession had taken place. This Agreement will be binding
                  upon and inure to the benefit of the Company and any successor
                  to the Company, including without limitation any persons
                  acquiring directly or indirectly all or substantially all of
                  the business or assets of the Company whether by purchase,
                  merger, consolidation, reorganization or otherwise (and such
                  successor shall thereafter be deemed the "Company" for the
                  purposes of this Agreement), but will not otherwise be
                  assignable, transferable or delegable by the Company.

         (b)      This Agreement will inure to the benefit of and be enforceable
                  by the Participant's personal or legal representatives,
                  executors, administrators, successors, heirs, distributees and
                  legatees.

         (c)      This Agreement is personal in nature and neither of the
                  parties hereto shall, without the consent of the other,
                  assign, transfer or delegate this Agreement or any rights or
                  obligations hereunder except as expressly provided in Sections
                  7(a) and 7(b). Without limiting the generality or effect of
                  the foregoing, the Participant's rights hereunder will not be
                  assignable, transferable or delegable, whether by pledge,
                  creation of a security interest, or otherwise, other than by a
                  transfer by Participant's will or by the laws of descent and
                  distribution and, in the event of any attempted assignment or
                  transfer contrary to this Section 7(c), the Company shall have
                  no liability to pay any amount so attempted to be assigned,
                  transferred or delegated.
<PAGE>   6
8.       Notices. For all purposes of this Agreement, all communications,
         including without limitation notices, consents, requests or approvals,
         required or permitted to be given hereunder will be in writing and will
         be deemed to have been duly given when hand delivered or dispatched by
         electronic facsimile transmission (with receipt thereof orally
         confirmed), or five business days after having been mailed by United
         States registered or certified mail, return receipt requested, postage
         prepaid, or three business days after having been sent by a nationally
         recognized overnight courier service such as Federal Express, UPS, or
         Purolator, addressed to the Company (to the attention of the Secretary
         of the Company) at its principal executive office and to the
         Participant at his principal residence, or to such other address as any
         party may have furnished to the other in writing and in accordance
         herewith, except that notices of changes of address shall be effective
         only upon receipt.

9.       Governing Law. The validity, interpretation, construction and
         performance of this Agreement will be governed by and construed in
         accordance with the substantive laws of the State of Illinois, without
         giving effect to the principles of conflict of laws of such State.

10.      Validity. If any provision of this Agreement or the application of any
         provision hereof to any person or circumstances is held invalid,
         unenforceable or otherwise illegal, the remainder of this Agreement and
         the application of such provision to any other person or circumstances
         will not be affected, and the provision so held to be invalid,
         unenforceable or otherwise illegal will be reformed to the extent (and
         only to the extent) necessary to make it enforceable, valid or legal.

11.      Miscellaneous. No provision of this Agreement may be modified, waived
         or discharged unless such waiver, modification or discharge is agreed
         to in writing signed by the Participant and the Company. No waiver by
         either party hereto at any time of any breach by the other party hereto
         or compliance with any condition or provision of this Agreement to be
         performed by such other party will be deemed a waiver of similar or
         dissimilar provisions or conditions at the same or at any prior or
         subsequent time. No agreements or representations, oral or otherwise,
         expressed or implied with respect to the subject matter hereof have
         been made by either party which are not set forth expressly in this
         Agreement. References to Sections are to references to Sections of this
         Agreement.

12.      Application of Agreement. Except as expressly amended pursuant to this
         Amendment No. 1, all terms of the Agreements remain in full force and
         effect.
<PAGE>   7
13.      Counterparts. This Amendment No. 1 may be executed in one or more
         counterparts, each of which shall be deemed to be an original but all
         of which together will constitute one and the same agreement.

IN WITNESS WHEREOF, the Corporation, by its duly authorized officer, and the
Participant, have executed this Amendment No. 1 either together or in the form
of multiple counterparts hereof (each of which shall be deemed an original)
effective as of the date and year first above written.

                                       AMERIN CORPORATION


                                       By: /s/ Randolph C. Sailer II
                                          ---------------------------------
                                               Senior Vice President


                                       JEROME J. SELITTO


                                       /s/ Jerome J. Selitto
                                       ------------------------------------


<PAGE>   1
                                                                   Exhibit 10.35


                               AMENDMENT NO. 1 TO
                    AMERIN CORPORATION EQUITY AWARD AGREEMENT


THIS AMENDMENT NO. 1, dated as of September 17, 1997 (the "Amendment"), by and
between Amerin Corporation, a Delaware corporation (the "Company"), and Gerald
L. Friedman (the "Participant"), amends the Amerin Corporation Equity Award
Agreement, dated as of May 1, 1997, by and between the Company and the
Participant (the "Agreement").

                                    RECITALS:

WHEREAS, the Corporation has previously adopted the USMIC Corporation 1992
Long-Term Stock Incentive Plan and has amended and restated such Plan as of
November 1, 1995 as the Amerin Corporation 1992 Long-Term Stock Incentive Plan
(the "Plan"), which Plan is incorporated herein by reference and made a part of
the Agreements and this Amendment; and

WHEREAS, pursuant to the Plan and the Agreements the Company has previously
granted the Options (as defined below) to the Participant as an inducement to
enter into and remain in the employment of the Company's wholly-owned
subsidiary, Amerin Guaranty Corporation ("Amerin") and as an increased incentive
to contribute to the Company's further success and prosperity; and

WHEREAS, the Participant is a senior executive of Amerin and has made and is
expected to continue to make major contributions to the short- and long-term
profitability, growth and financial strength of the Company;

WHEREAS, the Company recognizes that, as is the case for most publicly held
companies, the possibility of a Change in Control (as defined below) exists;

WHEREAS, the Company desires to assure itself of both present and future
continuity of management and desires to establish certain minimum severance
benefits for certain of its senior executives, including the Participant,
applicable in the event of a Change in Control;

WHEREAS, the Company wishes to ensure that its senior executives are not
practically disabled from discharging their duties in respect of a proposed or
actual transaction involving a Change in Control; and

WHEREAS, the Company desires to provide additional inducement for the
Participant to continue to remain in the ongoing employ of Amerin;

NOW, THEREFORE, the Company and the Participant agree that the Agreement shall
be amended as follows:

Capitalized terms not otherwise defined herein shall have the same meanings
specified in the Agreement, and capitalized terms not otherwise defined herein
or in the Agreements shall have the meanings specified in the Plan.
<PAGE>   2
1.       Certain Defined Terms. In addition to terms defined elsewhere herein,
         the following terms have the following meanings when used in this
         Agreement with initial capital letters:

         (a)      "Board" means the Board of Directors of the Company.

         (b)      "Change in Control" means the occurrence during the Term of
                  any of the following events:

                  (i)      The Company is merged, consolidated or reorganized
                           into or with another corporation or other legal
                           person, and as a result of such merger, consolidation
                           or reorganization less than a majority of the
                           combined voting power of the then-outstanding Voting
                           Stock of such corporation or person immediately after
                           such transaction are held in the aggregate by the
                           holders of Voting Stock of the Company immediately
                           prior to such transaction; or

                  (ii)     The Company sells or otherwise transfers all or
                           substantially all of its assets to another
                           corporation or other legal person, and as a result of
                           such sale or transfer less than a majority of the
                           combined voting power of the then-outstanding Voting
                           Stock of such corporation or person immediately after
                           such sale or transfer is held in the aggregate by the
                           holders of Voting Stock of the Company immediately
                           prior to such sale or transfer; or

                  (iii)    There is a report filed on Schedule 13D or Schedule
                           14D-1 (or any successor schedule, form or report),
                           each as promulgated pursuant to the Exchange Act,
                           disclosing that any person (as the term "person" is
                           used in Section 13(d)(3) or Section 14(d)(2) of the
                           Exchange Act) other than an Original Investor) has
                           become the beneficial owner (as the term "beneficial
                           owner" is defined under Rule 13d-3 or any successor
                           rule or regulation promulgated under the Exchange
                           Act) of securities representing 25% or more of the
                           combined voting power of the then-outstanding Voting
                           Stock of the Company.

                  Notwithstanding the foregoing provisions of Section 1(b)(iii),
                  unless otherwise determined in a specific case by majority
                  vote of the Board, a "Change in Control" shall not be deemed
                  to have occurred for purposes of Section 1(b)(iii) solely
                  because (A) the Company, (B) a Subsidiary, or (C) any
                  Company-sponsored employee stock ownership plan or any other
                  employee benefit plan of the Company or any Subsidiary either
                  files or becomes obligated to file a report or a proxy
                  statement under or in response to Schedule 13D, Schedule
                  14D-1, Form 8-K or Schedule 14A (or any successor schedule,
                  form or report or item therein) under the Exchange Act
<PAGE>   3
                  disclosing beneficial ownership by it of shares of Voting
                  Stock, whether in excess of 25% or otherwise, or because the
                  Company reports that a change in control of the Company has
                  occurred or will occur in the future by reason of such
                  beneficial ownership.

         (c)      "Exchange Act" means the Securities Exchange Act of 1934, as
                  amended.

         (d)      "Options" means (i) the First Option and Second Option (as
                  defined in the First Agreement) granted under the First
                  Agreement and (ii) the Option (as defined in the Second
                  Agreement) granted under the Second Agreement.

         (e)      "Original Investor" means any of the five institutional
                  investors which owned any capital stock of the Company as of
                  November 1, 1995.

         (f)      "Subsidiary" means an entity in which the Company directly or
                  indirectly beneficially owns 50% or more of the outstanding
                  Voting Stock.

         (g)      "Term" means the period commencing as of the date hereof and
                  expiring as of the later of (i) the close of business on
                  December 31, 2002, or (ii) the expiration of the Coverage
                  Period; provided, however, that (A) commencing on January 1,
                  2002 and each January 1 thereafter, the term of this Agreement
                  will automatically be extended for an additional year unless,
                  not later than September 30 of the immediately preceding year,
                  the Company or the Executive shall have given notice that it
                  or the Executive, as the case may be, does not wish to have
                  the Term extended and (B) subject to the last sentence of
                  Section 5, if, prior to a Change in Control, the Executive
                  ceases for any reason to be an employee of the Company and any
                  Subsidiary, thereupon without further action the Term shall be
                  deemed to have expired and this Agreement will immediately
                  terminate and be of no further effect. For purposes of this
                  Section 1(f), the Executive shall not be deemed to have ceased
                  to be an employee of the Company and any Subsidiary by reason
                  of the transfer of Executive's employment between the Company
                  and any Subsidiary, or among any Subsidiaries.

         (h)      "Voting Stock" means securities entitled to vote generally in
                  the election of directors.

2.       Operation of Agreement. This Agreement will be effective and binding
         immediately upon its execution, but, anything in this Agreement to the
         contrary notwithstanding, this Agreement will not be operative unless
         and until a Change in Control occurs. Upon the occurrence of a Change
         in Control at any time during the Term, without further action, this
         Agreement shall become immediately operative.

3.       Acceleration of Vesting.
<PAGE>   4
         (a)      Following the occurrence of a Change in Control, any portion
                  of the Options not otherwise exercisable as of the date of
                  such change in Control shall become immediately exercisable;
                  provided, however, that this Section 3(a) shall be of no force
                  and effect if such acceleration of exercisability would cause
                  the Company to be unable to use the pooling of interests
                  method of accounting in connection with the transactions
                  resulting in such Change in Control.

         (b)      Notwithstanding any provision of this Agreement to the
                  contrary, the parties' respective rights and obligations under
                  this Section 3 and under Section 4 will survive any
                  termination or expiration of this Agreement or the termination
                  of the Participant's employment following a Change in Control
                  for any reason whatsoever.

4.       Legal Fees and Expenses. It is the intent of the Company that the
         Participant not be required to incur legal fees and the related
         expenses associated with the interpretation, enforcement or defense of
         Participant's rights under this Agreement by litigation or otherwise
         because the cost and expense thereof would substantially detract from
         the benefits intended to be extended to the Participant hereunder.
         Accordingly, if it should appear to the Participant that the Company
         has failed to comply with any of its obligations under this Agreement
         or in the event that the Company or any other person takes or threatens
         to take any action to declare this Agreement void or unenforceable, or
         institutes any litigation or other action or proceeding designed to
         deny, or to recover from, the Participant the benefits provided or
         intended to be provided to the Participant hereunder, the Company
         irrevocably authorizes the Participant from time to time to retain
         counsel of Participant's choice, at the expense of the Company as
         hereafter provided, to advise and represent the Participant in
         connection with any such interpretation, enforcement or defense,
         including without limitation the initiation or defense of any
         litigation or other legal action, whether by or against the Company or
         any Director, officer, stockholder or other person affiliated with the
         Company, in any jurisdiction. Notwithstanding any existing or prior
         attorney-client relationship between the Company and such counsel, the
         Company irrevocably consents to the Participant's entering into an
         attorney-client relationship with such counsel, and in that connection
         the Company and the Participant agree that a confidential relationship
         shall exist between the Participant and such counsel. Without respect
         to whether the Participant prevails, in whole or in part, in connection
         with any of the foregoing, the Company will pay and be solely
         financially responsible for any and all attorneys' and related fees and
         expenses incurred by the Participant in connection with any of the
         foregoing.

5.       Employment Rights. Nothing expressed or implied in this Agreement will
         create any right or duty on the part of the Company or the Participant
         to have the Participant remain in the employment of the Company or any
         Subsidiary prior to or following any Change in Control. Any termination
         of employment of the Participant or the removal 
<PAGE>   5
         of the Participant from the office or position in the Company or any
         Subsidiary following the commencement of any discussion with a third
         person that ultimately results in a Change in Control shall be deemed
         to be a termination or removal of the Participant after a Change in
         Control for purposes of this Agreement.

6.       Withholding of Taxes. The Company may withhold from any amounts payable
         under this Agreement all federal, state, city or other taxes as the
         Company is required to withhold pursuant to any law or government
         regulation or ruling.

7.       Successors and Binding Agreement.

         (a)      The Company will require any successor (whether direct or
                  indirect, by purchase, merger, consolidation, reorganization
                  or otherwise) to all or substantially all of the business or
                  assets of the Company, by agreement in form and substance
                  satisfactory to the Participant, expressly to assume and agree
                  to perform this Agreement in the same manner and to the same
                  extent the Company would be required to perform if no such
                  succession had taken place. This Agreement will be binding
                  upon and inure to the benefit of the Company and any successor
                  to the Company, including without limitation any persons
                  acquiring directly or indirectly all or substantially all of
                  the business or assets of the Company whether by purchase,
                  merger, consolidation, reorganization or otherwise (and such
                  successor shall thereafter be deemed the "Company" for the
                  purposes of this Agreement), but will not otherwise be
                  assignable, transferable or delegable by the Company.

         (b)      This Agreement will inure to the benefit of and be enforceable
                  by the Participant's personal or legal representatives,
                  executors, administrators, successors, heirs, distributees and
                  legatees.

         (c)      This Agreement is personal in nature and neither of the
                  parties hereto shall, without the consent of the other,
                  assign, transfer or delegate this Agreement or any rights or
                  obligations hereunder except as expressly provided in Sections
                  7(a) and 7(b). Without limiting the generality or effect of
                  the foregoing, the Participant's rights hereunder will not be
                  assignable, transferable or delegable, whether by pledge,
                  creation of a security interest, or otherwise, other than by a
                  transfer by Participant's will or by the laws of descent and
                  distribution and, in the event of any attempted assignment or
                  transfer contrary to this Section 7(c), the Company shall have
                  no liability to pay any amount so attempted to be assigned,
                  transferred or delegated.

8.       Notices. For all purposes of this Agreement, all communications,
         including without limitation notices, consents, requests or approvals,
         required or permitted to be given hereunder will be in writing and will
         be deemed to have been duly given when hand delivered or dispatched by
         electronic facsimile transmission (with receipt thereof orally
         confirmed), or five business days after having been mailed by United
         States 
<PAGE>   6
         registered or certified mail, return receipt requested, postage
         prepaid, or three business days after having been sent by a nationally
         recognized overnight courier service such as Federal Express, UPS, or
         Purolator, addressed to the Company (to the attention of the Secretary
         of the Company) at its principal executive office and to the
         Participant at his principal residence, or to such other address as any
         party may have furnished to the other in writing and in accordance
         herewith, except that notices of changes of address shall be effective
         only upon receipt.

9.       Governing Law. The validity, interpretation, construction and
         performance of this Agreement will be governed by and construed in
         accordance with the substantive laws of the State of Illinois, without
         giving effect to the principles of conflict of laws of such State.

10.      Validity. If any provision of this Agreement or the application of any
         provision hereof to any person or circumstances is held invalid,
         unenforceable or otherwise illegal, the remainder of this Agreement and
         the application of such provision to any other person or circumstances
         will not be affected, and the provision so held to be invalid,
         unenforceable or otherwise illegal will be reformed to the extent (and
         only to the extent) necessary to make it enforceable, valid or legal.

11.      Miscellaneous. No provision of this Agreement may be modified, waived
         or discharged unless such waiver, modification or discharge is agreed
         to in writing signed by the Participant and the Company. No waiver by
         either party hereto at any time of any breach by the other party hereto
         or compliance with any condition or provision of this Agreement to be
         performed by such other party will be deemed a waiver of similar or
         dissimilar provisions or conditions at the same or at any prior or
         subsequent time. No agreements or representations, oral or otherwise,
         expressed or implied with respect to the subject matter hereof have
         been made by either party which are not set forth expressly in this
         Agreement. References to Sections are to references to Sections of this
         Agreement.

12.      Application of Agreement. Except as expressly amended pursuant to this
         Amendment No. 1, all terms of the Agreements remain in full force and
         effect.
<PAGE>   7
13.      Counterparts. This Amendment No. 1 may be executed in one or more
         counterparts, each of which shall be deemed to be an original but all
         of which together will constitute one and the same agreement.

IN WITNESS WHEREOF, the Corporation, by its duly authorized officer, and the
Participant, have executed this Amendment No. 1 either together or in the form
of multiple counterparts hereof (each of which shall be deemed an original)
effective as of the date and year first above written.


                                       AMERIN CORPORATION


                                       By: /s/ Randolph C. Sailer II
                                          ---------------------------------
                                               Senior Vice President


                                       GERALD L. FRIEDMAN


                                       /s/ Gerald L. Friedman
                                       ------------------------------------


<PAGE>   1
                                                                Exhibit 10.36

                               AMENDMENT NO. 1 TO
                   AMERIN CORPORATION EQUITY AWARD AGREEMENTS


THIS AMENDMENT NO. 1, dated as of October 7, 1998 (the "Amendment"), by and
between Amerin Corporation, a Delaware corporation (the "Company"), and William
V. Nardiello (the "Participant"), amends the Amerin Corporation Equity Award
Agreement, dated as of October 7, 1998 (the "Agreement").


                                R E C I T A L S:

WHEREAS, the Corporation has previously adopted the USMIC Corporation 1992
Long-Term Stock Incentive Plan and has most recently amended and restated such
Plan as of September 24, 1998 as the Second Amendment and Restatement of the
Amerin Corporation 1992 Long-Term Stock Incentive Plan (the "Plan"), which Plan
is incorporated herein by reference and made a part of the Agreement and this
Amendment; and

WHEREAS, pursuant to the Plan and the Agreement the Company has previously
granted the Options (as defined below) to the Participant as an inducement to
enter into and remain in the employment of the Company's wholly-owned
subsidiary, Amerin Guaranty Corporation ("Amerin") and as an increased incentive
to contribute to the Company's further success and prosperity; and

WHEREAS, the Participant is a senior executive of Amerin and has made and is
expected to continue to make major contributions to the short- and long-term
profitability, growth and financial strength of the Company;

WHEREAS, the Company recognizes that, as is the case for most publicly held
companies, the possibility of a Change in Control (as defined below) exists;

WHEREAS, the Company desires to assure itself of both present and future
continuity of management and desires to establish certain minimum severance
benefits for certain of its senior executives, including the Participant,
applicable in the event of a Change in Control;

WHEREAS, the Company wishes to ensure that its senior executives are not
practically disabled from discharging their duties in respect of a proposed or
actual transaction involving a Change in Control; and

WHEREAS, the Company desires to provide additional inducement for the
Participant to continue to remain in the ongoing employ of Amerin;

NOW, THEREFORE, the Company and the Participant agree that the Agreement shall
be amended as follows:

Capitalized terms not otherwise defined herein shall have the same meanings
specified in the Agreement, and capitalized terms not otherwise defined herein
or in the Agreements shall have the meanings specified in the Plan.
<PAGE>   2
1.       Certain Defined Terms. In addition to terms defined elsewhere herein,
         the following terms have the following meanings when used in this
         Agreement with initial capital letters:

         (a)      "Board" means the Board of Directors of the Company.

         (b)      "Change in Control" means the occurrence during the Term of 
                   any of the following events:

                  (i)      The Company is merged, consolidated or reorganized
                           into or with another corporation or other legal
                           person, and as a result of such merger, consolidation
                           or reorganization less than a majority of the
                           combined voting power of the then-outstanding Voting
                           Stock of such corporation or person immediately after
                           such transaction are held in the aggregate by the
                           holders of Voting Stock of the Company immediately
                           prior to such transaction; or

                  (ii)     The Company sells or otherwise transfers all or
                           substantially all of its assets to another
                           corporation or other legal person, and as a result of
                           such sale or transfer less than a majority of the
                           combined voting power of the then-outstanding Voting
                           Stock of such corporation or person immediately after
                           such sale or transfer is held in the aggregate by the
                           holders of Voting Stock of the Company immediately
                           prior to such sale or transfer; or

                  (iii)    There is a report filed on Schedule 13D or Schedule
                           14D-1 (or any successor schedule, form or report),
                           each as promulgated pursuant to the Exchange Act,
                           disclosing that any person (as the term "person" is
                           used in Section 13(d)(3) or Section 14(d)(2) of the
                           Exchange Act) other than an Original Investor) has
                           become the beneficial owner (as the term "beneficial
                           owner" is defined under Rule 13d-3 or any successor
                           rule or regulation promulgated under the Exchange
                           Act) of securities representing 25% or more of the
                           combined voting power of the then-outstanding Voting
                           Stock of the Company.

                  Notwithstanding the foregoing provisions of Section 1(b)(iii),
                  unless otherwise determined in a specific case by majority
                  vote of the Board, a "Change in Control" shall not be deemed
                  to have occurred for purposes of Section 1(b)(iii) solely
                  because (A) the Company, (B) a Subsidiary, or (C) any
                  Company-sponsored employee stock ownership plan or any other
                  employee benefit plan of the Company or any Subsidiary either
                  files or becomes obligated to file a report or a proxy
                  statement under or in response to Schedule 13D, Schedule
                  14D-1, Form 8-K or Schedule 14A (or any successor schedule,
                  form or report or item therein) under the Exchange Act
<PAGE>   3
                  disclosing beneficial ownership by it of shares of Voting
                  Stock, whether in excess of 25% or otherwise, or because the
                  Company reports that a change in control of the Company has
                  occurred or will occur in the future by reason of such
                  beneficial ownership.

         (c)      "Exchange Act" means the Securities Exchange Act of 1934, as
                  amended.

         (d)      "Options" means the Option (as defined in the Agreement)
                  granted under the Agreement.

         (e)      "Original Investor" means any of the five institutional
                  investors which owned any capital stock of the Company as of
                  November 1, 1995.

         (f)      "Subsidiary" means an entity in which the Company directly or
                  indirectly beneficially owns 50% or more of the outstanding
                  Voting Stock.

         (g)      "Term" means the period commencing as of the date hereof and
                  expiring as of the later of (i) the close of business on
                  December 31, 2003, or (ii) the expiration of the Coverage
                  Period; provided, however, that (A) commencing on January 1,
                  2003 and each January 1 thereafter, the term of this Agreement
                  will automatically be extended for an additional year unless,
                  not later than September 30 of the immediately preceding year,
                  the Company or the Executive shall have given notice that it
                  or the Executive, as the case may be, does not wish to have
                  the Term extended and (B) subject to the last sentence of
                  Section 5, if, prior to a Change in Control, the Executive
                  ceases for any reason to be an employee of the Company and any
                  Subsidiary, thereupon without further action the Term shall be
                  deemed to have expired and this Agreement will immediately
                  terminate and be of no further effect. For purposes of this
                  Section 1(f), the Executive shall not be deemed to have ceased
                  to be an employee of the Company and any Subsidiary by reason
                  of the transfer of Executive's employment between the Company
                  and any Subsidiary, or among any Subsidiaries.

         (h)      "Voting Stock" means securities entitled to vote generally in
                  the election of directors.

2.       Operation of Agreement. This Agreement will be effective and binding
         immediately upon its execution, but, anything in this Agreement to the
         contrary notwithstanding, this Agreement will not be operative unless
         and until a Change in Control occurs. Upon the occurrence of a Change
         in Control at any time during the Term, without further action, this
         Agreement shall become immediately operative.
<PAGE>   4
3.       Acceleration of Vesting.

         (a)      Following the occurrence of a Change in Control, any portion
                  of the Options not otherwise exercisable as of the date of
                  such change in Control shall become immediately exercisable;
                  provided, however, that this Section 3(a) shall be of no force
                  and effect if such acceleration of exercisability would cause
                  the Company to be unable to use the pooling of interests
                  method of accounting in connection with the transactions
                  resulting in such Change in Control.

         (b)      Notwithstanding any provision of this Agreement to the
                  contrary, the parties' respective rights and obligations under
                  this Section 3 and under Section 4 will survive any
                  termination or expiration of this Agreement or the termination
                  of the Participant's employment following a Change in Control
                  for any reason whatsoever.

4.       Legal Fees and Expenses. It is the intent of the Company that the
         Participant not be required to incur legal fees and the related
         expenses associated with the interpretation, enforcement or defense of
         Participant's rights under this Agreement by litigation or otherwise
         because the cost and expense thereof would substantially detract from
         the benefits intended to be extended to the Participant hereunder.
         Accordingly, if it should appear to the Participant that the Company
         has failed to comply with any of its obligations under this Agreement
         or in the event that the Company or any other person takes or threatens
         to take any action to declare this Agreement void or unenforceable, or
         institutes any litigation or other action or proceeding designed to
         deny, or to recover from, the Participant the benefits provided or
         intended to be provided to the Participant hereunder, the Company
         irrevocably authorizes the Participant from time to time to retain
         counsel of Participant's choice, at the expense of the Company as
         hereafter provided, to advise and represent the Participant in
         connection with any such interpretation, enforcement or defense,
         including without limitation the initiation or defense of any
         litigation or other legal action, whether by or against the Company or
         any Director, officer, stockholder or other person affiliated with the
         Company, in any jurisdiction. Notwithstanding any existing or prior
         attorney-client relationship between the Company and such counsel, the
         Company irrevocably consents to the Participant's entering into an
         attorney-client relationship with such counsel, and in that connection
         the Company and the Participant agree that a confidential relationship
         shall exist between the Participant and such counsel. Without respect
         to whether the Participant prevails, in whole or in part, in connection
         with any of the foregoing, the Company will pay and be solely
         financially responsible for any and all attorneys' and related fees and
         expenses incurred by the Participant in connection with any of the
         foregoing.

5.       Employment Rights. Nothing expressed or implied in this Agreement will
         create any right or duty on the part of the Company or the Participant
         to have the Participant 
<PAGE>   5
         remain in the employment of the Company or any Subsidiary prior to or
         following any Change in Control. Any termination of employment of the
         Participant or the removal of the Participant from the office or
         position in the Company or any Subsidiary following the commencement of
         any discussion with a third person that ultimately results in a Change
         in Control shall be deemed to be a termination or removal of the
         Participant after a Change in Control for purposes of this Agreement.

6.       Withholding of Taxes. The Company may withhold from any amounts payable
         under this Agreement all federal, state, city or other taxes as the
         Company is required to withhold pursuant to any law or government
         regulation or ruling.

7.       Successors and Binding Agreement.

         (a)      The Company will require any successor (whether direct or
                  indirect, by purchase, merger, consolidation, reorganization
                  or otherwise) to all or substantially all of the business or
                  assets of the Company, by agreement in form and substance
                  satisfactory to the Participant, expressly to assume and agree
                  to perform this Agreement in the same manner and to the same
                  extent the Company would be required to perform if no such
                  succession had taken place. This Agreement will be binding
                  upon and inure to the benefit of the Company and any successor
                  to the Company, including without limitation any persons
                  acquiring directly or indirectly all or substantially all of
                  the business or assets of the Company whether by purchase,
                  merger, consolidation, reorganization or otherwise (and such
                  successor shall thereafter be deemed the "Company" for the
                  purposes of this Agreement), but will not otherwise be
                  assignable, transferable or delegable by the Company.

         (b)      This Agreement will inure to the benefit of and be enforceable
                  by the Participant's personal or legal representatives,
                  executors, administrators, successors, heirs, distributees and
                  legatees.

         (c)      This Agreement is personal in nature and neither of the
                  parties hereto shall, without the consent of the other,
                  assign, transfer or delegate this Agreement or any rights or
                  obligations hereunder except as expressly provided in Sections
                  7(a) and 7(b). Without limiting the generality or effect of
                  the foregoing, the Participant's rights hereunder will not be
                  assignable, transferable or delegable, whether by pledge,
                  creation of a security interest, or otherwise, other than by a
                  transfer by Participant's will or by the laws of descent and
                  distribution and, in the event of any attempted assignment or
                  transfer contrary to this Section 7(c), the Company shall have
                  no liability to pay any amount so attempted to be assigned,
                  transferred or delegated.

8.       Notices. For all purposes of this Agreement, all communications,
         including without limitation notices, consents, requests or approvals,
         required or permitted to be given hereunder will be in writing and will
         be deemed to have been duly given when hand 
<PAGE>   6
         delivered or dispatched by electronic facsimile transmission (with
         receipt thereof orally confirmed), or five business days after having
         been mailed by United States registered or certified mail, return
         receipt requested, postage prepaid, or three business days after having
         been sent by a nationally recognized overnight courier service such as
         Federal Express, UPS, or Purolator, addressed to the Company (to the
         attention of the Secretary of the Company) at its principal executive
         office and to the Participant at his principal residence, or to such
         other address as any party may have furnished to the other in writing
         and in accordance herewith, except that notices of changes of address
         shall be effective only upon receipt.

9.       Governing Law. The validity, interpretation, construction and
         performance of this Agreement will be governed by and construed in
         accordance with the substantive laws of the State of Illinois, without
         giving effect to the principles of conflict of laws of such State.

10.      Validity. If any provision of this Agreement or the application of any
         provision hereof to any person or circumstances is held invalid,
         unenforceable or otherwise illegal, the remainder of this Agreement and
         the application of such provision to any other person or circumstances
         will not be affected, and the provision so held to be invalid,
         unenforceable or otherwise illegal will be reformed to the extent (and
         only to the extent) necessary to make it enforceable, valid or legal.

11.      Miscellaneous. No provision of this Agreement may be modified, waived
         or discharged unless such waiver, modification or discharge is agreed
         to in writing signed by the Participant and the Company. No waiver by
         either party hereto at any time of any breach by the other party hereto
         or compliance with any condition or provision of this Agreement to be
         performed by such other party will be deemed a waiver of similar or
         dissimilar provisions or conditions at the same or at any prior or
         subsequent time. No agreements or representations, oral or otherwise,
         expressed or implied with respect to the subject matter hereof have
         been made by either party which are not set forth expressly in this
         Agreement. References to Sections are to references to Sections of this
         Agreement.

12.      Application of Agreement. Except as expressly amended pursuant to this
         Amendment No. 1, all terms of the Agreement remain in full force and
         effect.
<PAGE>   7
13.      Counterparts. This Amendment No. 1 may be executed in one or more
         counterparts, each of which shall be deemed to be an original but all
         of which together will constitute one and the same agreement.

IN WITNESS WHEREOF, the Corporation, by its duly authorized officer, and the
Participant, have executed this Amendment No. 1 either together or in the form
of multiple counterparts hereof (each of which shall be deemed an original)
effective as of the date and year first above written.

                                            AMERIN CORPORATION


                                            By: /s/ Randolph C. Sailer II
                                               --------------------------------
                                                  Senior Vice President


                                                 WILLIAM V. NARDIELLO

                                                /s/ William V. Nardiello
                                                ----------------------------

<PAGE>   1
                                                                Exhibit 10.37

                               AMENDMENT NO. 1 TO
                   AMERIN CORPORATION EQUITY AWARD AGREEMENTS


THIS AMENDMENT NO. 1, dated as of October 7, 1998 (the "Amendment"), by and
between Amerin Corporation, a Delaware corporation (the "Company"), and Albert
V. Will (the "Participant"), amends the Amerin Corporation Equity Award
Agreement, dated as of October 7, 1998 (the "Agreement").


                                R E C I T A L S:

WHEREAS, the Corporation has previously adopted the USMIC Corporation 1992
Long-Term Stock Incentive Plan and has most recently amended and restated such
Plan as of September 24, 1998 as the Second Amendment and Restatement of the
Amerin Corporation 1992 Long-Term Stock Incentive Plan (the "Plan"), which Plan
is incorporated herein by reference and made a part of the Agreement and this
Amendment; and

WHEREAS, pursuant to the Plan and the Agreement the Company has previously
granted the Options (as defined below) to the Participant as an inducement to
enter into and remain in the employment of the Company's wholly-owned
subsidiary, Amerin Guaranty Corporation ("Amerin") and as an increased incentive
to contribute to the Company's further success and prosperity; and

WHEREAS, the Participant is a senior executive of Amerin and has made and is
expected to continue to make major contributions to the short- and long-term
profitability, growth and financial strength of the Company;

WHEREAS, the Company recognizes that, as is the case for most publicly held
companies, the possibility of a Change in Control (as defined below) exists;

WHEREAS, the Company desires to assure itself of both present and future
continuity of management and desires to establish certain minimum severance
benefits for certain of its senior executives, including the Participant,
applicable in the event of a Change in Control;

WHEREAS, the Company wishes to ensure that its senior executives are not
practically disabled from discharging their duties in respect of a proposed or
actual transaction involving a Change in Control; and

WHEREAS, the Company desires to provide additional inducement for the
Participant to continue to remain in the ongoing employ of Amerin;

NOW, THEREFORE, the Company and the Participant agree that the Agreement shall
be amended as follows:

Capitalized terms not otherwise defined herein shall have the same meanings
specified in the Agreement, and capitalized terms not otherwise defined herein
or in the Agreements shall have the meanings specified in the Plan.

<PAGE>   2

1.       Certain Defined Terms. In addition to terms defined elsewhere herein,
         the following terms have the following meanings when used in this
         Agreement with initial capital letters:

         (a)      "Board" means the Board of Directors of the Company.

         (b)      "Change in Control" means the occurrence during the Term of 
                   any of the following events:

                  (i)      The Company is merged, consolidated or reorganized
                           into or with another corporation or other legal
                           person, and as a result of such merger, consolidation
                           or reorganization less than a majority of the
                           combined voting power of the then-outstanding Voting
                           Stock of such corporation or person immediately after
                           such transaction are held in the aggregate by the
                           holders of Voting Stock of the Company immediately
                           prior to such transaction; or

                  (ii)     The Company sells or otherwise transfers all or
                           substantially all of its assets to another
                           corporation or other legal person, and as a result of
                           such sale or transfer less than a majority of the
                           combined voting power of the then-outstanding Voting
                           Stock of such corporation or person immediately after
                           such sale or transfer is held in the aggregate by the
                           holders of Voting Stock of the Company immediately
                           prior to such sale or transfer; or

                  (iii)    There is a report filed on Schedule 13D or Schedule
                           14D-1 (or any successor schedule, form or report),
                           each as promulgated pursuant to the Exchange Act,
                           disclosing that any person (as the term "person" is
                           used in Section 13(d)(3) or Section 14(d)(2) of the
                           Exchange Act) other than an Original Investor) has
                           become the beneficial owner (as the term "beneficial
                           owner" is defined under Rule 13d-3 or any successor
                           rule or regulation promulgated under the Exchange
                           Act) of securities representing 25% or more of the
                           combined voting power of the then-outstanding Voting
                           Stock of the Company.

                  Notwithstanding the foregoing provisions of Section 1(b)(iii),
                  unless otherwise determined in a specific case by majority
                  vote of the Board, a "Change in Control" shall not be deemed
                  to have occurred for purposes of Section 1(b)(iii) solely
                  because (A) the Company, (B) a Subsidiary, or (C) any
                  Company-sponsored employee stock ownership plan or any other
                  employee benefit plan of the Company or any Subsidiary either
                  files or becomes obligated to file a report or a proxy
                  statement under or in response to Schedule 13D, Schedule
                  14D-1, Form 8-K or Schedule 14A (or any successor schedule,
                  form or report or item therein) under the Exchange Act

<PAGE>   3

                  disclosing beneficial ownership by it of shares of Voting
                  Stock, whether in excess of 25% or otherwise, or because the
                  Company reports that a change in control of the Company has
                  occurred or will occur in the future by reason of such
                  beneficial ownership.

         (c)      "Exchange Act" means the Securities Exchange Act of 1934, as
                  amended.

         (d)      "Options" means the Option (as defined in the Agreement)
                  granted under the Agreement.

         (e)      "Original Investor" means any of the five institutional
                  investors which owned any capital stock of the Company as of
                  November 1, 1995.

         (f)      "Subsidiary" means an entity in which the Company directly or
                  indirectly beneficially owns 50% or more of the outstanding
                  Voting Stock.

         (g)      "Term" means the period commencing as of the date hereof and
                  expiring as of the later of (i) the close of business on
                  December 31, 2003, or (ii) the expiration of the Coverage
                  Period; provided, however, that (A) commencing on January 1,
                  2003 and each January 1 thereafter, the term of this Agreement
                  will automatically be extended for an additional year unless,
                  not later than September 30 of the immediately preceding year,
                  the Company or the Executive shall have given notice that it
                  or the Executive, as the case may be, does not wish to have
                  the Term extended and (B) subject to the last sentence of
                  Section 5, if, prior to a Change in Control, the Executive
                  ceases for any reason to be an employee of the Company and any
                  Subsidiary, thereupon without further action the Term shall be
                  deemed to have expired and this Agreement will immediately
                  terminate and be of no further effect. For purposes of this
                  Section 1(f), the Executive shall not be deemed to have ceased
                  to be an employee of the Company and any Subsidiary by reason
                  of the transfer of Executive's employment between the Company
                  and any Subsidiary, or among any Subsidiaries.

         (h)      "Voting Stock" means securities entitled to vote generally in
                  the election of directors.

2.       Operation of Agreement. This Agreement will be effective and binding
         immediately upon its execution, but, anything in this Agreement to the
         contrary notwithstanding, this Agreement will not be operative unless
         and until a Change in Control occurs. Upon the occurrence of a Change
         in Control at any time during the Term, without further action, this
         Agreement shall become immediately operative.


<PAGE>   4



3.       Acceleration of Vesting.

         (a)      Following the occurrence of a Change in Control, any portion
                  of the Options not otherwise exercisable as of the date of
                  such change in Control shall become immediately exercisable;
                  provided, however, that this Section 3(a) shall be of no force
                  and effect if such acceleration of exercisability would cause
                  the Company to be unable to use the pooling of interests
                  method of accounting in connection with the transactions
                  resulting in such Change in Control.

         (b)      Notwithstanding any provision of this Agreement to the
                  contrary, the parties' respective rights and obligations under
                  this Section 3 and under Section 4 will survive any
                  termination or expiration of this Agreement or the termination
                  of the Participant's employment following a Change in Control
                  for any reason whatsoever.

4.       Legal Fees and Expenses. It is the intent of the Company that the
         Participant not be required to incur legal fees and the related
         expenses associated with the interpretation, enforcement or defense of
         Participant's rights under this Agreement by litigation or otherwise
         because the cost and expense thereof would substantially detract from
         the benefits intended to be extended to the Participant hereunder.
         Accordingly, if it should appear to the Participant that the Company
         has failed to comply with any of its obligations under this Agreement
         or in the event that the Company or any other person takes or threatens
         to take any action to declare this Agreement void or unenforceable, or
         institutes any litigation or other action or proceeding designed to
         deny, or to recover from, the Participant the benefits provided or
         intended to be provided to the Participant hereunder, the Company
         irrevocably authorizes the Participant from time to time to retain
         counsel of Participant's choice, at the expense of the Company as
         hereafter provided, to advise and represent the Participant in
         connection with any such interpretation, enforcement or defense,
         including without limitation the initiation or defense of any
         litigation or other legal action, whether by or against the Company or
         any Director, officer, stockholder or other person affiliated with the
         Company, in any jurisdiction. Notwithstanding any existing or prior
         attorney-client relationship between the Company and such counsel, the
         Company irrevocably consents to the Participant's entering into an
         attorney-client relationship with such counsel, and in that connection
         the Company and the Participant agree that a confidential relationship
         shall exist between the Participant and such counsel. Without respect
         to whether the Participant prevails, in whole or in part, in connection
         with any of the foregoing, the Company will pay and be solely
         financially responsible for any and all attorneys' and related fees and
         expenses incurred by the Participant in connection with any of the
         foregoing.

5.       Employment Rights. Nothing expressed or implied in this Agreement will
         create any right or duty on the part of the Company or the Participant
         to have the Participant 

<PAGE>   5

         remain in the employment of the Company or any Subsidiary prior to or
         following any Change in Control. Any termination of employment of the
         Participant or the removal of the Participant from the office or
         position in the Company or any Subsidiary following the commencement of
         any discussion with a third person that ultimately results in a Change
         in Control shall be deemed to be a termination or removal of the
         Participant after a Change in Control for purposes of this Agreement.

6.       Withholding of Taxes. The Company may withhold from any amounts payable
         under this Agreement all federal, state, city or other taxes as the
         Company is required to withhold pursuant to any law or government
         regulation or ruling.

7.       Successors and Binding Agreement.

         (a)      The Company will require any successor (whether direct or
                  indirect, by purchase, merger, consolidation, reorganization
                  or otherwise) to all or substantially all of the business or
                  assets of the Company, by agreement in form and substance
                  satisfactory to the Participant, expressly to assume and agree
                  to perform this Agreement in the same manner and to the same
                  extent the Company would be required to perform if no such
                  succession had taken place. This Agreement will be binding
                  upon and inure to the benefit of the Company and any successor
                  to the Company, including without limitation any persons
                  acquiring directly or indirectly all or substantially all of
                  the business or assets of the Company whether by purchase,
                  merger, consolidation, reorganization or otherwise (and such
                  successor shall thereafter be deemed the "Company" for the
                  purposes of this Agreement), but will not otherwise be
                  assignable, transferable or delegable by the Company.

         (b)      This Agreement will inure to the benefit of and be enforceable
                  by the Participant's personal or legal representatives,
                  executors, administrators, successors, heirs, distributees and
                  legatees.

         (c)      This Agreement is personal in nature and neither of the
                  parties hereto shall, without the consent of the other,
                  assign, transfer or delegate this Agreement or any rights or
                  obligations hereunder except as expressly provided in Sections
                  7(a) and 7(b). Without limiting the generality or effect of
                  the foregoing, the Participant's rights hereunder will not be
                  assignable, transferable or delegable, whether by pledge,
                  creation of a security interest, or otherwise, other than by a
                  transfer by Participant's will or by the laws of descent and
                  distribution and, in the event of any attempted assignment or
                  transfer contrary to this Section 7(c), the Company shall have
                  no liability to pay any amount so attempted to be assigned,
                  transferred or delegated.

8.       Notices. For all purposes of this Agreement, all communications,
         including without limitation notices, consents, requests or approvals,
         required or permitted to be given hereunder will be in writing and will
         be deemed to have been duly given when hand 

<PAGE>   6

         delivered or dispatched by electronic facsimile transmission (with
         receipt thereof orally confirmed), or five business days after having
         been mailed by United States registered or certified mail, return
         receipt requested, postage prepaid, or three business days after having
         been sent by a nationally recognized overnight courier service such as
         Federal Express, UPS, or Purolator, addressed to the Company (to the
         attention of the Secretary of the Company) at its principal executive
         office and to the Participant at his principal residence, or to such
         other address as any party may have furnished to the other in writing
         and in accordance herewith, except that notices of changes of address
         shall be effective only upon receipt.

9.       Governing Law. The validity, interpretation, construction and
         performance of this Agreement will be governed by and construed in
         accordance with the substantive laws of the State of Illinois, without
         giving effect to the principles of conflict of laws of such State.

10.      Validity. If any provision of this Agreement or the application of any
         provision hereof to any person or circumstances is held invalid,
         unenforceable or otherwise illegal, the remainder of this Agreement and
         the application of such provision to any other person or circumstances
         will not be affected, and the provision so held to be invalid,
         unenforceable or otherwise illegal will be reformed to the extent (and
         only to the extent) necessary to make it enforceable, valid or legal.

11.      Miscellaneous. No provision of this Agreement may be modified, waived
         or discharged unless such waiver, modification or discharge is agreed
         to in writing signed by the Participant and the Company. No waiver by
         either party hereto at any time of any breach by the other party hereto
         or compliance with any condition or provision of this Agreement to be
         performed by such other party will be deemed a waiver of similar or
         dissimilar provisions or conditions at the same or at any prior or
         subsequent time. No agreements or representations, oral or otherwise,
         expressed or implied with respect to the subject matter hereof have
         been made by either party which are not set forth expressly in this
         Agreement. References to Sections are to references to Sections of this
         Agreement.

12.      Application of Agreement. Except as expressly amended pursuant to this
         Amendment No. 1, all terms of the Agreement remain in full force and
         effect.

<PAGE>   7


13.      Counterparts. This Amendment No. 1 may be executed in one or more
         counterparts, each of which shall be deemed to be an original but all
         of which together will constitute one and the same agreement.

IN WITNESS WHEREOF, the Corporation, by its duly authorized officer, and the
Participant, have executed this Amendment No. 1 either together or in the form
of multiple counterparts hereof (each of which shall be deemed an original)
effective as of the date and year first above written.

                                            AMERIN CORPORATION


                                            By: /s/ Randolph C. Sailer II
                                               --------------------------------
                                                  Senior Vice President


                                                 ALBERT V. WILL

                                                /s/ Albert V. Will   
                                                ----------------------------

<PAGE>   1
                                                                  Exhibit 10.39

                              EMPLOYMENT AGREEMENT


                  This EMPLOYMENT AGREEMENT (this "Agreement"), dated as of
March 12, 1999, is made and entered into by and between CMAC Investment
Corporation, a Delaware corporation (the "Company"), and Roy J. Kasmar (the
"Executive").

                                    RECITALS:

                  WHEREAS, Amerin Corporation, a Delaware corporation
("Amerin"), will merge with and into the Company (the "Merger") pursuant to an
Agreement and Plan of Merger, dated as of November 22, 1998 (the "Merger
Agreement");

                  WHEREAS, the Executive is entitled to receive certain benefits
pursuant to a Severance Agreement, dated as of September 17, 1997, by and
between the Executive and Amerin (the "Severance Agreement"), under certain
circumstances as a result of the Merger;

                  WHEREAS, the Company desires to retain the Executive to render
managerial services to the Company and its Subsidiaries (as defined below) and
the Executive desires to render such services;

                  WHEREAS, upon the consummation of the Merger, the Executive
and the Company desire to terminate the Severance Agreement; and

                  WHEREAS, the Company and the Executive desire to set forth
herein the terms and conditions on which the Company will employ the Executive,
and the Executive will accept employment with the Company.

                  NOW, THEREFORE, in consideration of the mutual premises,
agreements and covenants set forth herein and for other good and valuable
consideration, the receipt and sufficiency of which are hereby acknowledged, the
parties hereto, intending legally to be bound, hereby agree as follows:

                  1. Certain Defined Terms. In addition to terms defined
elsewhere herein, the following terms have the following meanings when used in
this Agreement with initial capital letters:

                  (a) "Base Pay" means $375,000 or such higher annual base
         salary as in effect for the Executive on or prior to the Termination
         Date.

                  (b) "Board" means the Board of Directors of the Company.
<PAGE>   2
                  (c) "Cause" means that, prior to any termination pursuant to
         Section 8(b), the Executive shall have committed:

                           (i) an intentional act of fraud, embezzlement or
                  theft in connection with his duties or in the course of his
                  employment with the Company or any Subsidiary;

                           (ii) intentional wrongful damage to property of the
                  Company or any Subsidiary;

                           (iii) intentional wrongful disclosure of secret
                  processes or confidential information of the Company or any
                  Subsidiary; or

                           (iv) intentional wrongful engagement in any
                  Competitive Activity;

                  and any such act shall have been materially harmful to the
                  Company. For purposes of this Agreement, no act or failure to
                  act on the part of the Executive shall be deemed "intentional"
                  if it was due primarily to an error in judgment or negligence,
                  but shall be deemed "intentional" only if done or omitted to
                  be done by the Executive not in good faith and without
                  reasonable belief that his action or omission was in the best
                  interest of the Company. Notwithstanding the foregoing, the
                  Executive shall not be deemed to have been terminated for
                  "Cause" hereunder unless and until there shall have been
                  delivered to the Executive a copy of a resolution duly adopted
                  by the affirmative vote of not less than three quarters of the
                  Board then in office at a meeting of the Board called and held
                  for such purpose, after reasonable notice to the Executive and
                  an opportunity for the Executive, together with his counsel
                  (if the Executive chooses to have counsel present at such
                  meeting), to be heard before the Board, finding that, in the
                  good faith opinion of the Board, the Executive had committed
                  an act constituting "Cause" as herein defined and specifying
                  the particulars thereof in detail. Nothing herein will limit
                  the right of the Executive or his beneficiaries to contest the
                  validity or propriety of any such determination.

                  (d) "Competitive Activity" means the Executive's
         participation, without the written consent of an officer of the
         Company, in the management of any other mortgage guaranty insurance
         company or any majority or sole owner of any mortgage guaranty
         insurance company, including becoming an employee, owner (except for
         passive investments of not more than one percent of the outstanding
         shares of, or any other equity interest in, any company or entity
         listed or traded on a national securities exchange or in an
         over-the-counter security market), officer, agent, consultant or
         director of any such company or owner thereof.
<PAGE>   3
                  (e) "Employee Benefits" mean the perquisites, benefits and
         service credit for benefits as provided under any and all employee
         retirement income and welfare benefit policies, plans, programs or
         arrangements in which the Executive is entitled to participate,
         including, without limitation, any stock option, stock purchase, stock
         appreciation, savings, pension, supplemental executive retirement, or
         other retirement income or welfare benefit, deferred compensation,
         incentive compensation, group or other life, health, medical/hospital
         or other insurance (whether funded by actual insurance or self-insured
         by the Company), disability, salary continuation, expense reimbursement
         and other employee benefit policies, plans, programs or arrangements.

                  (f) "Incentive Pay" means an annual amount equal to not less
         than the highest aggregate annual bonus, incentive or other payments of
         cash compensation, in addition to Base Pay, made or to be made in
         regard to services rendered in any calendar year pursuant to any bonus,
         incentive, profit-sharing, performance, discretionary pay or similar
         agreement, policy, plan, program or arrangement (whether or not funded)
         of the Company.

                  (g) "Subsidiary" means an entity in which the Company directly
         or indirectly beneficially owns 50% or more of the outstanding Voting
         Stock.

                  (h) "Termination Date" means the date on which the Executive's
         employment is terminated, the effective date of which shall be the date
         of termination, or such other date that may be specified by the
         Executive if the termination is pursuant to Section 8(b).

                  (i) "Voting Stock" means securities entitled to vote generally
         in the election of directors.

                  2. Employment. Effective upon the consummation of the Merger,
the Company hereby employs the Executive, and the Executive hereby accepts
employment with the Company, upon the terms and subject to the conditions set
forth in this Agreement.

                  3. Position and Duties. The Executive shall be employed as the
President and Chief Operating Officer of the Company. The Executive shall devote
substantially all of his business time and attention to the performance of his
duties hereunder, it being understood that he may, in his discretion and subject
to not interfering with his duties hereunder, devote time to other activities.
Subject to the authority of the Board and the Chief Executive Officer, the
Executive shall be responsible for the day-to-day nationwide general operation,
management and administration of all business of the Company and its
Subsidiaries, including, without limitation, as set forth in the By-laws of the
Company. The Executive shall report to the Chief Executive Officer of the
Company. The Executive has been elected as a member of the Board, effective as
of the date hereof. The Company shall cause the Executive to be included in any
slate of 


                                      -3-
<PAGE>   4
directors to be nominated for election to the Board (as a nominee of Amerin
while Amerin separately nominates directors pursuant to the terms of the Merger
Agreement) as of the date hereof and for successive terms while he is employed
by the Company.

                  4. Term of Employment. The term of the Executive's employment
hereunder shall commence as of the effective date of the Merger (the
"Commencement Date") and shall continue thereafter for a period of two (2) years
following the Commencement Date unless earlier terminated in accordance with the
provisions hereof.

                  5. Compensation. As compensation for all services rendered by
the Executive under this Agreement, the Company shall pay the Executive
compensation as follows:

                  (a) Annual Compensation. For all services rendered by the
         Executive during his employment under this Agreement, beginning on the
         Commencement Date, the Company shall pay the Executive an annual base
         salary in an amount not less than $375,000 per annum, payable in
         substantially equal bi-weekly installments. The Executive's annual
         salary shall be subject to review before January 1 of each year by the
         Board for possible merit increase. Any merit increase would be
         effective on or about January 1st of the following year.

                  (b) Target Bonus. The Company shall provide the Executive with
         a target bonus in an amount equal to (i) $475,000 for the period
         beginning on the Commencement Date and ending on December 31, 1999,
         (ii) $475,000 for the calendar year 2000, and (iii) a pro rated portion
         of $475,000 for the period beginning on January 1, 2001 and ending on
         the last day of the term of this Agreement, subject to adjustment in
         each case in accordance with the penultimate sentence of this clause
         (b) (the "Target"), to be earned based on the Company's annual
         performance determined in accordance with specified targets established
         by the Board of Directors in the normal running of the Company's
         business..

                  Notwithstanding anything to the contrary contained herein, the
Company shall pay the Executive a minimum of 50% of the Target in respect of the
period commencing on the Commencement Date and ending on December 31, 1999 and
in respect of the period commencing on January 1, 2000 and ending on December
31, 2000. The Company shall calculate and pay the bonus in January or February
of the calendar year following the year in which the bonus was earned. The
Executive shall be eligible for the full target bonus for 1999 without regard to
the fact that his employment with the Company will not begin before the
Commencement Date. If the Executive's employment terminates at or before the end
of the term of this Agreement for any reason other than for Cause, the Executive
will receive a pro rated bonus for the year in which his termination occurs as
follows:


                                      -4-
<PAGE>   5
                           (i) If the Company terminates the Executive's
                  employment other than for Cause, or if the Executive
                  terminates pursuant to Section 8(b), the Executive shall
                  receive a prorated portion of 50% of the Target for the
                  applicable period in which his termination occurs if the
                  Company is not meeting the performance objectives for the
                  bonus at the date of the termination of the Executive's
                  employment.

                           (ii) If the Company terminates the Executive's
                  employment other than for Cause, or if the Executive
                  terminates pursuant to Section 8(b) the Executive shall
                  receive a prorated portion of the Target then in effect (as if
                  fully earned) for the applicable period in which his
                  termination occurs if the Company is meeting the performance
                  objectives for the bonus at the date of the termination of the
                  Executive's employment.

                           (iii) If the Executive terminates his employment for
                  any reason other than for Cause or pursuant to Section 8(b),
                  the Executive shall receive a prorated portion of 50% of the
                  Target for the applicable period in which his termination
                  occurs.

                           (iv) The foregoing prorations shall be based on the
                  number of days within the applicable period that the Executive
                  was employed by the Company. The pro rated bonus will be paid
                  within thirty (30) days after the Executive's employment
                  terminates.

The Executive's target bonus shall be subject to review before January 1 of each
year by the Board for possible merit increase. Any merit increase would be
effective on or about January 1st of the following year.

                  (c) Other Benefits. The Executive shall be entitled to
         participate in those benefits available to the senior executive
         officers of the Company. The Executive shall be entitled to the
         vacation policy that applies to the senior executive officers of the
         Company. The Company shall give the Executive a car allowance, a
         country club membership and parking, in each case, on a basis
         equivalent to the senior executive officers of the Company.

                  6. Relocation.

                  (a) In Connection with the Merger. During the term of this
         Agreement, the Company shall, within thirty (30) calendar days of the
         Executive's request, cause a relocation company selected and paid for
         by the Company to purchase the Executive's house and property located
         at 13 Ambriance, Burr Ridge, Illinois 60521 (the "Executive's Home")
         for an amount in cash equal to their then fair market value to 



                                      -5-
<PAGE>   6
         be mutually determined by the relocation company and the Executive and
         shall pay the Executive $75,000 to cover miscellaneous expenses in
         connection with such sale. In connection with the Executive's
         relocation to the Philadelphia, Pennsylvania area, the Company shall
         pay in cash, within five (5) calendar days after the Executive's
         request and the Company's receipt of documentation of expenses, all (i)
         expenses of moving household goods and vehicles, (ii) costs for
         temporary storage of household goods and vehicles for up to twelve (12)
         months, (iii) reimbursement for reasonable temporary living expenses up
         to $60,000, (iv) duplicate interest expenses, if any, with respect to
         the Executive's Home and his new home in the Philadelphia area for up
         to six (6) months, (v) expenses related to house hunting trips, and
         (vi) fees and commissions relating to the Executive's purchase of a new
         home and the sale of the Executive's Home. The Company shall, within
         five (5) calendar days after the Executive's request and the Company's
         receipt of documentation of expenses, pay the Executive a tax gross-up
         payment for the relocation benefits described in this Section 6(a) in
         an amount necessary to make the after-tax benefit received by the
         Executive (taking into account the effect of both income taxes and any
         Excise Tax (as defined under Section 10(a) of this Agreement)) in
         respect of these relocation benefits equal to the pre-tax benefit of
         the payments to the Executive under this Section 6(a).

                  (b) Upon Termination. If the Executive's employment terminates
         other than for Cause during the term of this Agreement, and the
         Executive moves out of the Philadelphia, Pennsylvania area, the Company
         shall cause a relocation company selected and paid for by the Company
         to purchase the Executive's house and property in the Philadelphia,
         Pennsylvania area for an amount in cash equal to their then fair market
         value to be mutually determined by the relocation company and the
         Executive and shall pay the Executive $75,000 to cover miscellaneous
         expenses in connection with such sale within thirty (30) calendar days
         of the Executive's request, which request may occur at any time within
         six (6) months of the termination of the Executive's employment. To the
         extent more favorable to the Executive than as set forth herein,
         "Cause" shall have the meaning assigned to such term in any severance
         arrangement entered into between the Company and the Chief Executive
         Officer of the Company.

                  (c) The parties acknowledge that the relocation company may
         require withholding of amounts required to correct problems noted in
         the inspection of the Executive's Home.

                  7. Insurance. The Company shall provide to the Executive life
insurance and disability insurance to the same extent as provided to the Chief
Executive Officer of the Company and shall reimburse the Executive for the
premiums paid by Executive in respect thereof to the same extent as provided to
the Chief Executive Officer.


                                      -6-
<PAGE>   7
                  8. Termination.

                  (a) The Executive's employment may be terminated by the
         Company during the term of this Agreement and the Executive shall be
         entitled to benefits provided by Section 9 unless such termination is
         the result of the occurrence of one or more of the following events:

                           (i) The Executive's death;

                           (ii) If the Executive becomes permanently disabled
                  within the meaning of, and begins actually to receive
                  disability benefits pursuant to, the long-term disability plan
                  of the Company then in effect for, or applicable to, the
                  Executive; or

                           (iii) Cause.

                  If, during the term of this Agreement, the Executive's
         employment is terminated by the Company or any Subsidiary other than
         pursuant to Section 8(a)(i), 8(a)(ii) or 8(a)(iii), the Executive shall
         be entitled to the benefits provided by Section 9 hereof.

                  (b) The Executive may terminate employment with the Company
         and any Subsidiary during the term of this Agreement with the right to
         the benefits as provided in Section 9 upon the occurrence of one or
         more of the following events (regardless of whether any other reason,
         other than Cause as hereinabove provided, for such termination exists
         or has occurred, including without limitation other employment):

                           (i) Failure to elect or reelect or otherwise to
                  maintain the Executive in the office or the position, or a
                  substantially equivalent office or position, of or with the
                  Company and/or a Subsidiary, as the case may be, which the
                  Executive holds upon the effective date of the Merger pursuant
                  to this Agreement, or the removal of the Executive as a
                  Director of the Company (or any successor thereto);

                           (ii) (A) A significant adverse change in the nature
                  or scope of the authorities, powers, functions,
                  responsibilities or duties attached to the position with the
                  Company and/or any Subsidiary which the Executive holds upon
                  the effective date of the Merger pursuant to this Agreement,
                  (B) a reduction in the aggregate of the Executive's Base Pay
                  and Incentive Pay received from the Company and any
                  Subsidiary, or (C) the termination or denial of the
                  Executive's rights to Employee Benefits or a reduction in the
                  scope or value thereof (except that the level of any such
                  Employee Benefits may be reduced in the event of a
                  corresponding reduction generally applicable to all recipients
                  of or participants in such Employee Benefits), any of which is
                  not remedied by the Company within 



                                      -7-
<PAGE>   8
                  ten (10) calendar days after receipt by the Company of written
                  notice from the Executive of such change, reduction or
                  termination, as the case may be;

                           (iii) The liquidation, dissolution, merger,
                  consolidation or reorganization of the Company or transfer of
                  all or substantially all of its business and/or assets, unless
                  the successor or successors (by liquidation, merger,
                  consolidation, reorganization, transfer or otherwise) to which
                  all or substantially all of its business and/or assets have
                  been transferred (directly or by operation of law) assumed all
                  duties and obligations of the Company under this Agreement
                  pursuant to Section 20(a); or

                           (iv) Without limiting the generality or effect of the
                  foregoing, any material breach of this Agreement by the
                  Company or any successor thereto (including without limitation
                  any failure of the Company or a successor to pay the Executive
                  the compensation required by Section 5(a) or (b) of this
                  Agreement).

                  (c) A termination by the Company pursuant to Section 8(a) or
         by the Executive pursuant to Section 8(b) shall not affect any rights
         that the Executive may have pursuant to any agreement, policy, plan,
         program or arrangement of the Company providing Employee Benefits,
         which rights shall be governed by the terms thereof.

                  9. Severance Compensation.

                  (a) If the Company terminates the Executive's employment
         during the term of this Agreement other than pursuant to Section 8(a),
         or if the Executive terminates his employment pursuant to Section 8(b),
         the Company shall pay to the Executive the following amounts within
         thirty (30) business days after the Termination Date and continue to
         provide to the Executive the following benefits:

                           (i) A lump sum payment in an amount equal to three
                  (3) times the Base Pay;

                           (ii) For a period of two years following the
                  Termination Date (the "Continuation Period"), the Company
                  shall arrange to provide the Executive with Employee Benefits
                  that are welfare benefits (but not stock option, stock
                  purchase, stock appreciation or similar compensatory benefits)
                  substantially similar to those that the Executive was
                  receiving or entitled to receive immediately prior to the
                  Termination Date (or, if greater, immediately prior to the
                  reduction, termination, or denial described in Section
                  8(b)(ii)), except that the level of any such Employee Benefits
                  to be provided to the Executive may be reduced in the event of
                  a corresponding reduction generally applicable to all
                  recipients of or participants in such Employee Benefits. If
                  and to the extent that


                                      -8-
<PAGE>   9
                  any benefit described in the immediately preceding sentence is
                  not or cannot be paid or provided under any policy, plan
                  program or arrangement of the Company or any Subsidiary, as
                  the case may be, then the Company shall itself pay or provide
                  for the payment to the Executive, his dependents and
                  beneficiaries, of such Employee Benefits. Without otherwise
                  limiting the purposes or effect of Section 10, Employee
                  Benefits otherwise receivable by the Executive pursuant to the
                  first sentence of this Section 9(a)(ii) shall be reduced to
                  the extent comparable welfare benefits are actually received
                  by the Executive from another employer during the Continuation
                  Period following the Executive's Termination Date, and any
                  such benefits actually received by the Executive shall be
                  reported by the Executive to the Company.

                  (b) Without limiting the rights of the Executive at law or in
         equity, if the Company fails to make any payment or provide any benefit
         required to be made or provided hereunder on a timely basis, the
         Company shall pay interest on the amount or value thereof at an
         annualized rate of interest equal to the so-called composite "prime
         rate" as quoted from time to time during the relevant period in the
         Northeast Edition of The Wall Street Journal. Such interest shall be
         payable as it accrues on demand. Any change in such prime rate shall be
         effective on and as of the date of such change.

                  (c) Notwithstanding any provision of this Agreement to the
         contrary, the parties' respective rights and obligations under this
         Section 6, Section 9 and Sections 10 through 25 shall survive any
         termination or expiration of this Agreement or the termination of the
         Executive's employment for any reason whatsoever.

                  10. Certain Additional Payments by the Company.

                  (a) Anything in this Agreement to the contrary
         notwithstanding, but subject to Section 10(h), in the event that
         Section 9 of this Agreement shall become operative and it shall be
         determined (as hereafter provided) that any payment or distribution by
         the Company or any of its affiliates to or for the benefit of the
         Executive paid or payable or distributed or distributable pursuant to
         the terms of this Agreement (a "Payment"), would be subject to the
         excise tax imposed by Section 4999 of the Internal Revenue Code of
         1986, as amended (the "Code") (or any successor provision thereto) by
         reason of being considered "contingent on a change in ownership or
         control" of the Company, within the meaning of Section 280G of the Code
         (or any successor provision thereto) or to any similar tax imposed by
         state or local law, or any interest or penalties with respect to such
         tax (such tax or taxes, together with any such interest and penalties,
         being hereafter collectively referred to as the "Excise Tax"), then the
         Executive shall be entitled to receive an additional payment or
         payments (collectively, a "Gross-Up Payment"). The Gross-Up Payment
         shall be in an amount such that, after payment by the Executive of all
         taxes (including any interest or penalties imposed with respect to such
         

                                      -9-
<PAGE>   10
         taxes), including any Excise Tax imposed upon the Gross-Up Payment, the
         Executive retains an amount of the Gross-Up Payment equal to the Excise
         Tax imposed upon the Payment.

                  (b) Subject to the provisions of Section 10(f), all
         determinations required to be made under this Section 10, including
         whether an Excise Tax is payable by the Executive and the amount of
         such Excise Tax and whether a Gross-Up Payment is required to be paid
         by the Company to the Executive and the amount of such Gross-Up
         Payment, if any, shall be made by a nationally recognized accounting
         firm (the "Accounting Firm") selected by the Executive in his sole
         discretion. The Executive shall direct the Accounting Firm to submit
         its determination and detailed supporting calculations to both the
         Company and the Executive within thirty (30) calendar days after the
         Termination Date, if applicable, and any such other time or times as
         may be requested by the Company or the Executive. If the Accounting
         Firm determines that any Excise Tax is payable by the Executive, the
         Company shall pay the required Gross-Up Payment to the Executive within
         fifteen business days after receipt of such determination and
         calculations with respect to any Payment to the Executive. If the
         Accounting Firm determines that no Excise Tax is payable by the
         Executive, it shall, at the same time as it makes such determination,
         furnish the Company and the Executive an opinion that the Executive has
         substantial authority not to report any Excise Tax on his federal,
         state or local income or other tax return. As a result of the
         uncertainty in the application of Section 4999 of the Code (or any
         successor provision thereto) and the possibility of similar uncertainty
         regarding applicable state or local tax law at the time of any
         determination by the Accounting Firm hereunder, it is possible that
         Gross-Up Payments which shall not have been made by the Company should
         have been made (an "Underpayment"), consistent with the calculations
         required to be made hereunder. In the event that the Company exhausts
         or fails to pursue its remedies pursuant to Section 10(f) and the
         Executive thereafter is required to make a payment of any Excise Tax,
         the Executive shall direct the Accounting Firm to determine the amount
         of the Underpayment that has occurred and to submit its determination
         and detailed supporting calculations to both the Company and the
         Executive as promptly as possible. Any such Underpayment shall be
         promptly paid by the Company to, or for the benefit of, the Executive
         within fifteen business days after receipt of such determination and
         calculations.

                  (c) The Company and the Executive shall each provide the
         Accounting Firm access to and copies of any books, records and
         documents in the possession of the Company or the Executive, as the
         case may be, reasonably requested by the Accounting Firm, and otherwise
         cooperate with the Accounting Firm in connection with the preparation
         and issuance of the determinations and calculations contemplated by
         Section 10(b). Any determination by the Accounting Firm as to the
         amount of the Gross-Up Payment shall be binding upon the Company and
         the Executive.


                                      -10-
<PAGE>   11
                  (d) The federal, state and local income or other tax returns
         filed by the Executive shall be prepared and filed on a consistent
         basis with the determination of the Accounting Firm with respect to the
         Excise Tax payable by the Executive. The Executive shall make proper
         payment of the amount of any Excise Payment, and at the request of the
         Company, provide to the Company true and correct copies (with any
         amendments) of his federal income tax return as filed with the Internal
         Revenue Service and corresponding state and local tax returns, if
         relevant, as filed with the applicable taxing authority, and such other
         documents reasonably requested by the Company, evidencing such payment.
         If prior to the filing of the Executive's federal income tax return, or
         corresponding state or local tax return, if relevant, the Accounting
         Firm determines that the amount of the Gross-Up Payment should be
         reduced, the Executive shall within fifteen business days pay to the
         Company the amount of such reduction.

                  (e) The fees and expenses of the Accounting Firm for its
         services in connection with the determinations and calculations
         contemplated by Section 10(b) shall be borne by the Company. If such
         fees and expenses are initially paid by the Executive, the Company
         shall reimburse the Executive the full amount of such fees and expenses
         within fifteen business days after receipt from the Executive of a
         statement therefor and reasonable evidence of his payment thereof.

                  (f) The Executive shall notify the Company in writing of any
         claim by the Internal Revenue Service or any other taxing authority
         that, if successful, would require the payment by the Company of a
         Gross-Up Payment. Such notification shall be given as promptly as
         practicable but no later than ten (10) business days after the
         Executive actually receives notice of such claim and the Executive
         shall further apprise the Company of the nature of such claim and the
         date on which such claim is requested to be paid (in each case, to the
         extent known by the Executive). The Executive shall not pay such claim
         prior to the earlier of (i) the expiration of the 30-calendar-day
         period following the date on which he gives such notice to the Company
         and (ii) the date that any payment of amount with respect to such claim
         is due. If the Company notifies the Executive in writing prior to the
         expiration of such period that it desires to contest such claim, the
         Executive shall:

                           (i) provide the Company with any written records or
                  documents in his possession relating to such claim reasonably
                  requested by the Company;

                           (ii) take such action in connection with contesting
                  such claim as the Company shall reasonably request in writing
                  from time to time, including without limitation accepting
                  legal representation with respect to such claim by an attorney
                  competent in respect of the subject matter and reasonably
                  selected by the Company;


                                      -11-
<PAGE>   12
                           (iii) cooperate with the Company in good faith in
                  order effectively to contest such claim; and

                           (iv) permit the Company to participate in any
                  proceedings relating to such claim;

                  provided, however, that the Company shall bear and pay
                  directly all costs and expenses (including interest and
                  penalties) incurred in connection with such contest and shall
                  indemnify and hold harmless the Executive, on an after-tax
                  basis, for and against any Excise Tax or income tax, including
                  interest and penalties with respect thereto, imposed as a
                  result of such representation and payment of costs and
                  expenses. Without limiting the foregoing provisions of this
                  Section 10(f), the Company shall control all proceedings taken
                  in connection with the contest of any claim contemplated by
                  this Section 10(f) and, at its sole option, may pursue or
                  forego any and all administrative appeals, proceedings,
                  hearings and conferences with the taxing authority in respect
                  of such claim (provided, however, that the Executive may
                  participate therein at his own cost and expense) and may, at
                  its option, either direct the Executive to pay the tax claimed
                  and sue for a refund or contest the claim in any permissible
                  manner, and the Executive agrees to prosecute such contest to
                  a determination before any administrative tribunal, in a court
                  of initial jurisdiction and in one or more appellate courts,
                  as the Company shall determine; provided, however, that if the
                  Company directs the Executive to pay the tax claimed and sue
                  for a refund, the Company shall advance the amount of such
                  payment to the Executive on an interest-free basis and shall
                  indemnify and hold the Executive harmless, on an after-tax
                  basis, from any Excise Tax or income or other tax, including
                  interest or penalties with respect thereto, imposed with
                  respect to such advance; and provided further, however, that
                  any extension of the statute of limitations relating to
                  payment of taxes for the taxable year of the Executive with
                  respect to which the contested amount is claimed to be due is
                  limited solely to such contested amount. Furthermore, the
                  Company's control of any such contested claim shall be limited
                  to issues with respect to which a Gross-Up Payment would be
                  payable hereunder and the Executive shall be entitled to
                  settle or contest, as the case may be, any other issue raised
                  by the Internal Revenue Service or any other taxing authority.

                  (g) If, after the receipt by the Executive of an amount
         advanced by the Company pursuant to Section 10(f), the Executive
         receives any refund with respect to such claim, the Executive shall
         (subject to the Company's complying with the requirements of Section
         10(f) promptly pay to the Company the amount of such refund (together
         with any interest paid or credited thereon after any taxes applicable
         thereto). If, after the receipt by the Executive of an amount advanced
         by the Company pursuant to Section 10(f), a determination is made that
         the Executive shall not be entitled to any 


                                      -12-
<PAGE>   13
         refund with respect to such claim and the Company does not notify the
         Executive in writing of its intent to contest such denial or refund
         prior to the expiration of thirty (30) calendar days after such
         determination, then such advance shall be forgiven and shall not be
         required to be repaid and the amount of any such advance shall offset,
         to the extent thereof, the amount of Gross-Up Payment required to be
         paid by the Company to the Executive pursuant to this Section 10.

                  (h) Notwithstanding any provision of this Agreement to the
         contrary, if (i) but for this sentence, the Company would be obligated
         to make a Gross-Up Payment to the Executive, (ii) the aggregate
         "present value" of the "parachute payments" to be paid or provided to
         the Executive under this Agreement or otherwise does not exceed 1.15
         multiplied by three times the Executive's "base amount" and (iii) but
         for this sentence, an amount equal to the excess of (A) the net
         after-tax proceeds (taking into account both income taxes and any
         Excise Tax) received by the Executive in respect of the parachute
         payments (and taking into account payment of the Gross-Up Payment),
         over (B) the maximum net after-tax benefit to the Executive of
         parachute payments the present value of which is not equal to or
         greater than three times the Executive's base amount, is not greater
         than $50,000, then the payments and benefits to be paid or provided
         under this Agreement shall be reduced to the minimum extent necessary
         (but in no event to less than zero) so that no portion of any payment
         or benefit to the Executive, as so reduced, constitutes an "excess
         parachute payment." For purposes of this Section 10(h), the terms
         "excess parachute payment," "present value," "parachute payment," and
         "base amount" shall have the meanings assigned to them by Section 280G
         of the Code. The determination of whether any reduction in such
         payments or benefits to be provided under this Agreement is required
         pursuant to the preceding sentence shall be made at the expense of the
         Company, if requested by the Executive or the Company, by the
         Accounting Firm. The fact that the Executive's right to payments or
         benefits may be reduced by reason of the limitations contained in this
         Section 10(h) shall not of itself limit or otherwise affect any other
         rights of the Executive other than pursuant to this Agreement. In the
         event that any payment or benefit intended to be provided under this
         Agreement or otherwise is required to be reduced pursuant to this
         Section 10(h), the Executive shall be entitled to designate the
         payments and/or benefits to be so reduced in order to give effect to
         this Section 10(h). The Company shall provide the Executive with all
         information reasonably requested by the Executive to permit the
         Executive to make such designation. In the event that the Executive
         fails to make such designation within ten (10) business days of the
         Termination Date, the Company may effect such reduction in any manner
         it deems appropriate.

                  11. No Mitigation Obligation. The Company hereby acknowledges
that it will be difficult and may be impossible for the Executive to find
reasonably comparable employment following the Termination Date. Accordingly,
the payment of the severance compensation by the Company to the Executive in
accordance with the terms of this Agreement is hereby 


                                      -13-
<PAGE>   14
acknowledged by the Company to be reasonable, and the Executive shall not be
required to mitigate the amount of any payment provided for in this Agreement by
seeking other employment or otherwise, nor shall any profits, income, earnings
or other benefits from any source whatsoever create any mitigation, offset,
reduction or any other obligation on the part of the Executive hereunder or
otherwise, except as expressly provided in the last sentence of Section
9(a)(ii).

                  12. Legal Fees and Expenses. The Company shall pay all of the
reasonable legal fees and expenses incurred by the Executive in connection with
the negotiation and preparation of this Agreement and the Agreement dated as of
the date hereof by and between the Executive and the Company. It is the intent
of the Company that the Executive not be required to incur legal fees and the
related expenses associated with the interpretation, enforcement or defense of
Executive's rights under this Agreement by litigation or otherwise because the
cost and expense thereof would substantially detract from the benefits intended
to be extended to the Executive hereunder. Accordingly, if it should appear to
the Executive that the Company has failed to comply with any of its obligations
under this agreement or in the event that the Company or any other person takes
or threatens to take any action to declare this Agreement void or unenforceable,
or institutes any litigation or other action or proceeding designed to deny, or
to recover from, the Executive the benefits provided or intended to be provided
to the Executive hereunder, the Company irrevocably authorizes the Executive
from time to time to retain counsel of Executive's choice, at the expense of the
Company as hereafter provided, to advise and represent the Executive in
connection with any such interpretation, enforcement or defense, including
without limitation, the initiation or defense of any litigation or other legal
action, whether by or against the Company or any director, officer, stockholder
or other person affiliated with the Company, in any jurisdiction.
Notwithstanding any existing or prior attorney-client relationship between the
Company and such counsel, the Company irrevocably consents to the Executive's
entering into an attorney-client relationship with such counsel, and in that
connection the Company and the Executive agree that a confidential relationship
shall exist between the Executive and such counsel. Without respect to whether
the Executive prevails, in whole or in part, in connection with any of the
foregoing, the Company shall pay and be solely financially responsible for any
and all attorneys' and related fees and expenses incurred by the Executive in
connection with any of the foregoing.

                  13. Competitive Activity. During a period ending one (1) year
following the Executive's Termination Date, if the Executive shall have received
or shall be receiving benefits under Section 9 and, if applicable, Section 10,
the Executive shall not, without the prior written consent of the Company, which
consent shall not be unreasonably withheld, engage in any Competitive Activity.

                  14. Employment Rights. Nothing expressed or implied in this
Agreement will create any right or duty on the part of the Company or the
Executive to have the Executive remain in the employment of the Company or any
Subsidiary after the term of this Agreement.


                                      -14-
<PAGE>   15
                  15. Withholding of Taxes. The Company may withhold from any
amounts payable under this Agreement all federal, state, city or other taxes as
the Company is required to withhold pursuant to any law or government regulation
or ruling.

                  16. Other Expenses. The Executive shall be entitled to receive
prompt reimbursement for all reasonable expenses incurred by the Executive in
performing services hereunder, including, without limitation, all reasonable
travel and living expenses incurred while away from home on business or at the
request of the Company in accordance with the applicable Company policy.

                  17. Representation. The Company represents and warrants that
it is fully authorized and empowered to enter into this Agreement and that the
performance of its obligations under this Agreement will not violate any
agreement between it and any other person, firm or organization. The Executive
represents that the performance of his obligations under this Agreement will not
violate any agreement between him and any other person, firm or organization
that would be violated by the performance of his obligations under this
Agreement.

                  18. Termination of Severance Agreement. The parties hereto
agree that, as of the effective date of the Merger, the Severance Agreement
shall be terminated and of no further force or effect.

                  19. Treatment of Equity. The parties acknowledge that pursuant
to the Amerin Corporation Equity Award Agreements dated as of May 20, 1996,
January 17, 1997, May 1, 1997, November 14, 1997, as amended, and the Amerin
Corporation Stock Option Agreement dated as of May 20, 1998, the Executive's
options to purchase common stock of Amerin and the Executive's restricted stock
of Amerin are fully vested as a result of the Merger.


                                      -15-
<PAGE>   16
                  20. Successors and Binding Agreement.

                  (a) The Company will require any successor (whether direct or
         indirect, by purchase, merger, consolidation, reorganization or
         otherwise) to all or substantially all of the business or assets of the
         Company, by agreement in form and substance satisfactory to the
         Executive, expressly to assume and agree to perform this Agreement in
         the same manner and to the same extent the Company would be required to
         perform if no such succession had taken place. This Agreement shall be
         binding upon and inure to the benefit of the Company and any successor
         to the Company, including, without limitation, any persons acquiring
         directly or indirectly all or substantially all of the business or
         assets of the Company whether by purchase, merger, consolidation,
         reorganization or otherwise (and such successor shall thereafter be
         deemed the "Company" for the purposes of this Agreement), but shall not
         otherwise be assignable, transferable or delegable by the Company.

                  (b) This Agreement shall inure to the benefit of and be
         enforceable by the Executive's personal or legal representatives,
         executors, administrators, successors, heirs, distributees and
         legatees. This Agreement shall have no force or effect in the event the
         Merger is not consummated by June 30, 1999.

                  (c) This Agreement is personal in nature and neither of the
         parties hereto shall, without the consent of the other, assign,
         transfer or delegate this Agreement or any rights or obligations
         hereunder except as expressly provided in Sections 19(a) and 19(b).
         Without limiting the generality or effect of the foregoing, the
         Executive's right to receive payments hereunder shall not be
         assignable, transferable or delegable, whether by pledge, creation of a
         security interest, or otherwise, other than by a transfer by
         Executive's will or by the laws of descent and distribution and, in the
         event of any attempted assignment or transfer contrary to this Section
         19(c), the Company shall have no liability to pay any amount so
         attempted to be assigned, transferred or delegated.

                  21. Notices. For all purposes of this Agreement, all
communications, including without limitation notices, consents, requests or
approvals, required or permitted to be given hereunder shall be in writing and
shall be deemed to have been duly given when hand delivered or dispatched by
electronic facsimile transmission (with receipt thereof orally confirmed), or
five (5) business days after having been mailed by United States registered or
certified mail, return receipt requested, postage prepaid, or three (3) business
days after having been sent by a nationally recognized overnight courier service
such as Federal Express, UPS, or Purolator, addressed to the Company (to the
attention of the Secretary of the Company) at its principal executive office and
to the Executive at his principal residence, or to such other address as any
party may have furnished to the other in writing and in accordance herewith,
except that notices of changes of address shall be effective only upon receipt.


                                      -16-
<PAGE>   17
                  22. Governing Law. The validity, interpretation, construction
and performance of this Agreement shall be governed by and construed in
accordance with the substantive laws of the Commonwealth of Pennsylvania,
without giving effect to the principles of conflict of laws of such State.

                  23. Validity. If any provision of this Agreement or the
application of any provision hereof to any person or circumstances is held
invalid, unenforceable or otherwise illegal, the remainder of this Agreement and
the application of such provision to any other person or circumstances shall not
be affected, and the provision so held to be invalid, unenforceable or otherwise
illegal shall be reformed to the extent (and only to the extent) necessary to
make it enforceable, valid or legal.

                  24. Miscellaneous. No provision of this Agreement may be
modified, waived or discharged unless such waiver, modification or discharge is
agreed to in writing signed by the Executive and the Company. No waiver by
either party hereto at any time of any breach by the other party hereto or
compliance with any condition or provision of this Agreement to be performed by
such other party shall be deemed a waiver of similar or dissimilar provisions or
conditions at the same or at any prior or subsequent time. No agreements or
representations, oral or otherwise, expressed or implied with respect to the
subject matter hereof have been made by either party which are not set forth
expressly in this Agreement. References to Sections are to references to
Sections of this Agreement.

                  25. Counterparts. This Agreement may be executed in one or
more counterparts, each of which shall be deemed to be an original but all of
which together shall constitute one and the same agreement.

                  IN WITNESS WHEREOF, the parties have caused this Agreement to
be duly executed and delivered as of the date first written above.


                                    CMAC INVESTMENT CORPORATION


                                    By:  /s/ Frank P. Filipps
                                        -------------------------------------

                                         /s/ Roy J. Kasmar
                                        -------------------------------------
                                                 Roy J. Kasmar


                                      -17-

<PAGE>   1
                                                                   EXHIBIT 10.40

                                   AGREEMENT

            This AGREEMENT (this "Agreement") is made and entered into this 12th
day of March, 1999 by and between CMAC INVESTMENT CORPORATION, a corporation
organized and existing under the laws of the state of Delaware (hereinafter
referred to as the "Company"), and Roy J. Kasmar (hereinafter referred to as the
"Employee").

                                  RECITALS:

            WHEREAS, the Employee will be employed by the Company as its
President and Chief Operating Officer; and

            WHEREAS, the Board of Directors of the Company (the "Board")
recognizes that, as is the case with many publicly-held corporations, the
possibility of a change in control of the Company exists and that such
possibility, and the uncertainty and questions it may raise among management,
may result in the departure or distraction of key management personnel to the
detriment of the Company; and

            WHEREAS, the Board has determined that appropriate steps should be
taken to reinforce and encourage the continued attention and dedication of key
members of the Company's management to their assigned duties without distraction
in the face of potentially disturbing circumstances arising from the possibility
of a change in control of the Company; and

            WHEREAS, in order to induce the Employee to be an employee of the
Company, the Company agrees that the Employee shall receive the compensation set
forth in this Agreement as a cushion against the financial and career impact on
the Employee in the event that Employee's employment with the Company is
terminated subsequent to a "Change of Control" (as that term is defined in
Section 1 hereof).

            NOW, THEREFORE, in consideration of the foregoing and the mutual
covenants and agreements hereinafter set forth and intending to be legally bound
hereby, the parties hereto agree as follows, effective as of the date on which
the Employee becomes an employee of the Company:

            1. Definitions. When used in this Agreement, the following terms
shall have the specific meanings shown in this Section unless the context of any
provision of this Agreement clearly requires otherwise:

                  (a) "Affiliate" and "Associate" shall have the respective
meanings ascribed to such terms in Rule 12b-2 of the General Rules and
Regulations under the Securities Exchange Act of 1934, as amended (the "Exchange
Act").
<PAGE>   2
                  (b) "Beneficial Owner" of any securities shall mean:


                        (i) that such Person or any of such Person's Affiliates
or Associates, directly or indirectly, has the right to acquire (whether such
right is exercisable immediately or only after the passage of time) pursuant to
any agreement, arrangement or understanding (whether or not in writing) or upon
the exercise of conversion rights, exchange rights, rights, warrants or options,
or otherwise; provided, however, that a Person shall not be deemed the
"Beneficial Owner" of securities tendered pursuant to a tender or exchange offer
made by such Person or any of such Person's Affiliates or Associates until such
tendered securities are accepted for payment, purchase or exchange;

                        (ii) that such Person or any of such Person's Affiliates
or Associates, directly or indirectly, has the right to vote or dispose of or
has "beneficial ownership" of (as determined pursuant to Rule 13d-3 of the
General Rules and Regulations under the Exchange Act), including without
limitation, pursuant to any agreement, arrangement or understanding (whether or
not in writing); provided, however, that a Person shall not be deemed the
"Beneficial Owner" of any security under this subsection (ii) as a result of an
oral or written agreement, arrangement or understanding to vote such security if
such agreement, arrangement or understanding (A) arises solely from a revocable
proxy given in response to a public proxy or consent solicitation made pursuant
to, and in accordance with, the applicable provisions of the General Rules and
Regulations under the Exchange Act, and (B) is not then reportable by such
Person on Schedule 13D under the Exchange Act (or any comparable successor
report); or

                        (iii) where voting securities are beneficially owned,
directly or indirectly, by any other Person (or any Affiliate or Associate
thereof) with which such Person (or any of such Person's Affiliates or
Associates) has any agreement, arrangement or understanding (whether or not in
writing) for the purpose of acquiring, holding, voting (except pursuant to a
revocable proxy described in the proviso to subsection (ii) above) or disposing
of any voting securities of the Company;

provided, however, that nothing in this subsection (b) shall cause a Person
engaged in business as an underwriter of securities to be the "Beneficial Owner"
of any securities acquired through such Person's participation in good faith in
a firm commitment underwriting until expiration of forty (40) days after the
date of such acquisition.

                  (c) "Change of Control" shall be deemed to have taken place if
(i) any Person (except for the Employee or his family, the Company or any
employee benefit plan of the Company or of any Affiliate, any Person or entity
organized, appointed or established by the Company for or pursuant to the terms
of any such employee benefit plan), together with all Affiliates and Associates
of such Person, shall become the Beneficial Owner in the aggregate of 20% or
more of the shares of the Company then outstanding and entitled to vote for
directors generally, (ii) any Person (except the Employee and his family),
together with all Affiliates and Associates of such


                                      -2-
<PAGE>   3
Person purchases substantially all of the assets of the Company, or (iii) during
any twenty-four (24) month period, individuals who at the beginning of such
period constituted the Board cease for any reason to constitute a majority
thereof, unless the election, or the nomination for election by the Company's
stockholders, of at least seventy-five percent (75%) of the directors who were
not directors at the beginning of such period was approved by a vote of at least
seventy-five percent (75%) of the directors in office at the time of such
election or nomination who were directors at the beginning of such period.
Notwithstanding the foregoing, the merger between the Company and Amerin
Corporation shall not be considered a Change of Control for purposes of this
Agreement (the "Amerin/CMAC Merger").

                  (d) "Person" shall mean any individual, firm, corporation,
partnership or other entity.

                  (e) "Subsidiary" shall have the meaning ascribed to such term
in Rule 12b-2 of the General Rules and Regulations under the Exchange Act.

                  (f) "Termination Date" shall mean the date of receipt of the
Notice of Termination described in Section 2 hereof or any later date specified
therein, as the case may be.

                  (g) "Termination of Employment" shall mean the termination of
the Employee's actual employment relationship with the Company.

                  (h) "Termination following a Change of Control" shall mean a
Termination of Employment within two years after a Change of Control either:

                        (i) initiated by the Company for any reason other than
(a) the Employee's continuous illness, injury or incapacity for a period of
twelve consecutive months or (b) for "cause", which shall mean misappropriation
of funds, habitual insobriety, substance abuse, conviction of a crime involving
moral turpitude, or gross negligence in the performance of duties, which gross
negligence has had a material adverse effect on the business, operations,
assets, properties or financial condition of the Company and its Subsidiaries
taken as a whole; or

                        (ii) initiated by the Employee upon the occurrence of
one or more of the following:

                              (A) any failure of the Company to comply with and
satisfy any of the conditions of this Agreement;

                              (B) any change resulting in a significant
reduction by the Company of the authority, duties or responsibilities of the
Employee;


                                      -3-
<PAGE>   4
                              (C) any removal by the Company of the Employee
from the employment grade, compensation level or officer positions which the
Employee holds as of the effective date hereof, except in connection with
promotions to a higher office;

                              (D) the requirement that the Employee undertake
business travel (or commuting in excess of fifty miles each way) to an extent
substantially greater than is reasonable and customary for the position the
Employee holds.

            2. Notice of Termination. Any Termination following a Change of
Control shall be communicated by a Notice of Termination to the other party
hereto given in accordance with Section 15 hereof. For purposes of this
Agreement, a "Notice of Termination" means a written notice which (i) indicates
the specific termination provision in this Agreement relied upon, (ii) briefly
summarizes the facts and circumstances deemed to provide a basis for termination
of the Employee's employment under the provision so indicated, and (iii) if the
Termination Date is other than the date of receipt of such notice, specifies the
Termination Date (which date shall not be more than fifteen days after the
giving of such notice).

            3.    Benefits Upon Change of Control.

                  (a) In the event of a Change of Control (i) any stock options
previously granted to the Employee under any Company stock option or equity
compensation plan which have not yet vested shall become vested, and (ii) any
restricted stock previously granted to the Employee under any Company equity
compensation plan which has not yet vested or become freely transferable shall
become vested and freely transferable.

                  (b) In the event of the Employee's Termination following a
Change of Control the Company shall pay to the Employee, within fifteen days
after the Termination Date, an amount in cash equal to 2.0 times (i) the
Employee's then current annual base compensation, plus (ii) the Employee's then
current target bonus eligibility.

                  (c) In the event of the Employee's Termination following a
Change of Control, the Employee shall be entitled to continued participation in
the Company's life, disability, accident and health insurance plans for a period
not to exceed thirty-six (36) months following the termination.

            4. Other Payments. The payment due under Section 3 hereof shall be
in addition to and not in lieu of any payments or benefits due to the Employee
under any other plan, policy or program of the Company except that no payments
shall be due to the Employee under the Company's then current severance pay plan
for employees, it any.

            5. Establishment of Trust. The Company has or will establish an
irrevocable trust fund (hereinafter referred to as the "Trust Fund") pursuant to
a trust agreement to hold assets contributed to satisfy its obligations under
this Agreement. Funding of such trust fund shall be


                                      -4-
<PAGE>   5
subject to the Company's discretion, as set forth in the trust agreement
establishing the Trust Fund. Notwithstanding the foregoing:

                  (a) Upon a Change of Control of the Company, the Chief
Financial Officer of the Company, or his authorized representative (hereinafter
referred to collectively as the "Treasurer"), shall immediately remit to the
Trustee of the Trust Fund as a contribution to the applicable trust established
as part of the Trust Fund for the benefit of the Employee the amount due under
this Agreement and not yet contributed to the Trustee as well as an amount
estimated to be sufficient to pay all fees and expenses that may thereafter
become due. The Trustee shall be under no duty to determine the sufficiency, or
to enforce the making, of such contributions.

                  (b) In the event that the Chairman of the Board determines
that a Change of Control of the Company is imminent, the Treasurer shall make
the payments to the Trustee specified in paragraph (i) above. If a Change of
Control of the Company shall not have occurred within ninety (90) days of the
contribution made pursuant to this Section 5 and the Board adopts a resolution
to the effect that, for purposes of this Agreement, a Change of Control of the
Company is not imminent, any amounts added to the Trust Fund pursuant to this
Section, together with any earnings thereon, shall be paid by the Trustee to the
Company.

            6.    Enforcement.

                  (a) In the event that the Company shall fail or refuse to make
payment of any amounts due the Employee under Sections 3 and 4 hereof within the
respective time periods provided therein, the Company shall pay to the Employee,
in addition to the payment of any other sums provided in this Agreement,
interest, compounded daily, on any amount remaining unpaid from the date payment
is required under Sections 3 and 4, as appropriate, until paid to the Employee,
at the rate from time to time announced by PNC Bank, or its successor, as its
"prime rate" plus 2%, each change in such rate to take effect on the effective
date of the change in such prime rate.

                  (b) It is the intent of the parties that the Employee not be
required to incur any expenses associated with the enforcement of his rights
under this Agreement by arbitration, litigation or other legal action because
the cost and expense thereof would substantially detract from the benefits
intended to be extended to the Employee hereunder. Accordingly, the Company
shall pay the Employee on demand the amount necessary to reimburse the Employee
in full for all expenses (including attorney's fees and legal expenses) incurred
by the Employee in enforcing any of the obligations of the Company under this
Agreement.

            7. No Mitigation. The Employee shall not be required to mitigate the
amount of any payment or benefit provided for in this Agreement by seeking other
employment or otherwise, nor shall the amount of any payment or benefit provided
for herein be reduced by any compensation earned by other employment or
otherwise.


                                      -5-
<PAGE>   6
            8. Non-exclusivity of Rights. Nothing in this Agreement shall
prevent or limit the Employee's continuing or future participation in or rights
under any benefit, bonus, incentive or other plan or program provided by the
Company or any of its Subsidiaries or Affiliates and for which the Employee may
qualify; provided, however, that with respect to a Termination following a
Change of Control, the Employee hereby waives the Employee's right to receive
any payments under any severance pay plan or similar program applicable to other
employees of the Company, and agrees to accept the payment provided in Section
3(b) above in lieu of any other severance pay plan or similar program.

            9. No Set-Off. The Company's obligation to make the payments
provided for in this Agreement and otherwise to perform its obligations
hereunder shall not be affected by any circumstances, including, without
limitation, any set-off, counterclaim, recoupment, defense or other right which
the Company may have against the Employee or others.

            10. Taxes. Any payment required under this Agreement shall be
subject to all requirements of law with regard to the withholding of taxes,
filing, making of reports and the like, and the Company shall use its best
efforts to satisfy promptly all such requirements.

            11. Adjustment for Taxes. In the event that either the Company's
independent public accountants or the Internal Revenue Service determine that
any payment coverage, benefit or benefit acceleration provided to the Employee,
whether specifically provided for in this Agreement or otherwise, is subject to
the excise tax imposed by Section 4999 (or any successor provision) ("Section
4999") of the Code, the Company, within thirty (30) days thereafter, shall pay
to the Employee, in addition to any other payment, coverage or benefit due and
owing hereunder, an amount determined by multiplying the rate of excise tax then
imposed by Section 4999 by the amount of the "excess parachute payment" received
by the Employee (determined without regard to any payments made to the Employee
pursuant to this paragraph) and dividing the product so obtained by the amount
obtained by subtracting the aggregate local, estate and Federal income tax rate
applicable to the receipt by the Employee of the "excess parachute payment"
(taking into account the deductibility for Federal income tax purposes of the
payment of state and local income taxes thereon) from the amount obtained by
subtracting from 1.00 the rate of excise tax then imposed by Section 4999 of the
Code, it being the Company's intention that the Employee's net after tax
position be identical to that which would have obtained had Sections 280G and
4999 not been a part of the Code.

            12. Term of Agreement. The term of this Agreement shall be for 3
years from the date hereof and shall be automatically renewed for successive
one-year periods unless the Company notifies the Employee in writing that this
Agreement will not be renewed at least sixty (60) days prior to the end of the
current term; provided, however, that (i) after a Change of Control during the
term of this Agreement, this Agreement shall remain in effect until all of the
obligations of the parties hereunder are satisfied or have expired, and (ii)
this Agreement shall terminate if, prior to a


                                      -6-
<PAGE>   7
Change of Control, the employment of the Employee with the Company or any of its
Subsidiaries, as the case may be, shall terminate for any reason, or if the
Employee shall cease to be an Employee.

            13. Successor Company. The Company shall require any successor or
successors (whether direct or indirect, by purchase, merger, consolidation or
otherwise) to all or substantially all of the business and/or assets of the
Company, by agreement in form and substance satisfactory to the Employee, to
acknowledge expressly that this Agreement is binding upon and enforceable
against the Company in accordance with the terms hereof, and to become jointly
and severally obligated with the Company to perform this Agreement in the same
manner and to the same extent that the Company would be required to perform if
no such succession or successions had taken place. Failure of the Company to
obtain such agreement prior to the effectiveness of any such succession shall be
a breach of this Agreement. As used in this Agreement, the Company shall mean
the Company as hereinbefore defined and any successor or successors to its
business and/or assets, jointly and severally.

            14. Greater Benefits. Notwithstanding anything contained in this
Agreement to the contrary, in the event of the Employee's Termination following
a Change of Control during the two-year period immediately following the
Amerin/CMAC Merger, the Company shall pay to the Employee the greater of (i) the
severance compensation and benefits provided pursuant to the terms of this
Agreement, or (ii) the severance compensation and benefits provided pursuant to
the terms of the Employment Agreement attached hereto as Exhibit A, but not
duplicate benefits. The Employee shall, in his sole discretion, determine which
of the foregoing benefits are greater. The Company agrees to amend this
Agreement at the option of the Employee to the extent that a majority of the
Change of Control Agreements between the Company and its senior executive
officers (which are substantially similar to this Agreement) are amended
following the date hereof.

            15. Notice. All notices and other communications required or
permitted hereunder or necessary or convenient herewith shall be in writing and
shall be delivered personally or mailed by registered or certified mail, return
receipt requested, or by overnight express courier service, as follows:

            If to the Company, to:

            CMAC Investment Corporation
            1601 Market Street
            Philadelphia, PA 19103
            Attention: Corporate Secretary
            
            If to the Employee, to:

            Roy J. Kasmar

            _______________________

                                      -7-
<PAGE>   8
            _______________________

            _______________________


or to such other names or addresses as the Company or the Employee, as the case
may be, shall designate by notice to the other party hereto in the manner
specified in this Section 14; provided, however, that if no such notice is given
by the Company following a Change of Control, notice at the last address of the
Company or to any successor pursuant to Section 13 hereof shall be deemed
sufficient for the purposes hereof. Any such notice shall be deemed delivered
and effective when received in the case of personal delivery; five days after
deposit, postage prepaid, with the U.S. Postal Service in the case of registered
or certified mail; or on the next business day in the case of an overnight
express courier service.

            16. Governing Law. This Agreement shall be governed by and construed
by and interpreted under the laws of the Commonwealth of Pennsylvania without
giving effect to any conflict of laws provisions.

            17. Contents of Agreements, Amendment and Assignment.

                  (a) This Agreement supersedes all prior agreements and sets
forth the entire understanding between the parties hereto with respect to the
subject matter hereof and cannot be changed, modified, extended or terminated
except upon written amendment executed by the Employee and approved by the Board
and executed on the Company's behalf by a duly authorized officer. The
provisions of this Agreement may provide for payments to the Employee under
certain compensation or bonus plans under circumstances where such plans would
not provide for the payment thereof. It is the specific intention of the parties
that the provisions of this Agreement shall supersede any provisions to the
contrary in such plans, and such plans shall be deemed to have been amended to
correspond with this Agreement without further action by the Company or the
Board.

                  (b) Nothing in this Agreement shall be construed as giving the
Employee any right to be retained in the employ of the Company.

                  (c) All of the terms and provisions of this Agreement shall be
binding upon and inure to the benefit of and be enforceable by the respective
heirs, representatives, successors and assigns of the parties hereto, except
that the duties and responsibilities of the Employee and the Company hereunder
shall not be assignable in whole or in part by the Company.

            18. Severability. If any provision of this Agreement or application
thereof to anyone or under any circumstances shall be determined to be invalid
or unenforceable, such invalidity or unenforceability shall not affect any other
provisions or applications of this Agreement which can be given effect without
the invalid or unenforceable provision or application.


                                      -8-
<PAGE>   9
            19. Remedies Cumulative; No Waiver. No right conferred upon the
Employee by this Agreement is intended to be exclusive of any other right or
remedy, and each and every such right or remedy shall be cumulative and shall be
in addition to any other right or remedy given hereunder or now or hereafter
existing at law or in equity. No delay or omission by the Employee in exercising
any right, remedy or power hereunder or existing at law or in equity shall be
construed as a waiver thereof, including, without limitation, any delay by the
Employee in delivering a Notice of Termination pursuant to Section 2 hereof
after an event has occurred which would, if the Employee had resigned, have
constituted a Termination following a Change of Control pursuant to this
Agreement.

            20. Miscellaneous. All section headings are for convenience only.
This Agreement may be executed in several counterparts, each of which is an
original. It shall not be necessary in making proof of this Agreement or any
counterpart hereof to produce or account for any of the other counterparts.

            IN WITNESS WHEREOF, the undersigned, intending to be legally bound,
have executed this Agreement as of the date first above written.

CMAC INVESTMENT CORPORATION

By: /s/ Frank P. Filipps                  /s/ Roy J. Kasmar
   -------------------------------       -------------------------------------
   Frank P. Filipps, Chief Executive     Roy J. Kasmar
       Officer

Attest: /s/ Howard S. Yaruss
       -----------------------------

                                    -9-

<PAGE>   1
                                                                    Exhibit 23.1

INDEPENDENT AUDITORS' CONSENT

     We consent to the incorporation by reference in this Registration Statement
of CMAC Investment Corporation on Form S-4 of our report dated January 29, 1999,
appearing in the Annual Report on Form 10-K of CMAC Investment Corporation for
the year ended December 31, 1998.


DELOITTE & TOUCHE LLP
Philadelphia, PA

May 6, 1999


<PAGE>   1
                                                                    EXHIBIT 23.2


                         CONSENT OF INDEPENDENT AUDITORS


We consent to the reference to our firm under the caption "Independent
Accountants" and to the use of our report dated January 21, 1999, with respect
to the consolidated financial statements and schedules of Amerin Corporation and
subsidiaries included in its Annual Report, as amended (Form 10-K/A), for the
year ended December 31, 1998, filed with the Securities and Exchange Commission
and incorporated by reference in the Joint Proxy Statement/Prospectus that is
made part of the Registration Statement on Form S-4 of CMAC Investment
Corporation.



                                                  ERNST & YOUNG LLP

Chicago, Illinois
May 6, 1999

<PAGE>   1


                                                                    EXHIBIT 23.3

                         CONSENT OF SCHRODER & CO. INC.

                                  May 6, 1999


         We hereby consent to the use of our opinion letter dated November 22,
1998 to the Board of Directors of CMAC Investment Corporation included in
Appendix III to the Joint Proxy Statement/Prospectus which forms a part of the
Registration Statement on Form S-4 relating to the proposed merger described
therein and to the references to such opinion in such Joint Proxy
Statement/Prospectus under the captions "Summary -- The Merger -- Opinions of
Financial Advisors" and "Opinions of Financial Advisors". In giving such
consent, we do not admit that we come within the category of persons whose
consent is required under Section 7 of the Securities Act of 1933, as amended,
or the rules and regulations of the Securities and Exchange Commission
thereunder, nor do we thereby admit that we are experts with respect to any part
of such Registration Statement within the meaning of the term "experts" as used
in the Securities Act of 1933, as amended, or the rules and regulations of the
Securities and Exchange Commission thereunder.


                                                   /s/ SCHRODER & CO. INC.




<PAGE>   1
                                                                    EXHIBIT 23.4

         CONSENT OF DONALDSON, LUFKIN & JENRETTE SECURITIES CORPORATION

         We hereby consent to (i) the inclusion of our opinion letter, dated
November 22, 1998, to the Board of Directors of Amerin Corporation (the
"Company") as Appendix IV to the Joint Proxy Statement/Prospectus (the
"Prospectus") of the Company and CMAC Investment Corporation ("CMAC") relating
to the merger between the Company and CMAC and (ii) all references to DLJ and
our opinion letter in the Prospectus which forms a part of this Registration
Statement on Form S-4. In giving such consent, we do not admit that we come
within the category of persons whose consent is required under, and we do not
admit that we are "experts" for purposes of, the Securities Act of 1933, as
amended, and the rules and regulations promulgated thereunder.

                                      DONALDSON, LUFKIN & JENRETTE
                                      SECURITIES CORPORATION



                                      By:   /s/ David M. Platter
                                          ------------------------------
                                           David M. Platter
                                           Managing Director


New York, New York
May 6, 1999



                                       

<PAGE>   1
                                                                    Exhibit 23.7

                            CONSENT OF ROY J. KASMAR

     The undersigned hereby consents to the inclusion of his name in the Joint
Proxy Statement/Prospectus constituting a part of this Registration Statement on
Form S-4 as a person to become a director of Radian Group Inc. upon consummation
of the merger of Amerin Corporation with and into CMAC Investment Corporation,
which at the effective time of the merger will be renamed Radian Group Inc.


Signature: /s/ Roy J. Kasmar
           ------------------
           Roy J. Kasmar


Date: March 15, 1999


<PAGE>   1
                                                                    Exhibit 23.8

                          CONSENT OF LARRY E. SWEDROE

     The undersigned hereby consents to the inclusion of his name in the Joint
Proxy Statement/Prospectus constituting a part of this Registration Statement on
Form S-4 as a person to become a director of Radian Group Inc. upon consummation
of the merger of Amerin Corporation with and into CMAC Investment Corporation,
which at the effective time of the merger will be renamed Radian Group Inc.

Signature:  /s/ Larry E. Swedroe
            ----------------
            Larry E. Swedroe

Date: March 15, 1999

<PAGE>   1
                                                                    EXHIBIT 23.9



                         CONSENT OF STEPHEN T. HOPKINS

     The undersigned hereby consents to the inclusion of his name in the Joint 
Proxy Statement/Prospectus constituting a part of this Registration Statement 
on Form S-4 as a person to become a director of Radian Group Inc. upon 
consummation of the merger of Amerin Corporation with and into CMAC Investment 
Corporation, which at the effective time of the merger will be renamed Radian 
Group Inc.




Signature:    /s/ Stephen T. Hopkins
              ______________________
                  Stephen T. Hopkins


Date: March 15, 1999







<PAGE>   1
                                                                   Exhibit 23.10

                         CONSENT OF Rosemarie B. Greco

     The undersigned hereby consents to the inclusion of her name in the Joint 
Proxy Statement/Prospectus constituting a part of this Registration Statement 
on Form S-4 as a person to become a director of Radian Group Inc. upon 
consummation of the merger of Amerin Corporation with and into CMAC Investment 
Corporation, which at the effective time of the merger will be renamed Radian 
Group Inc.


Signature:     /s/ Rosemarie B. Greco
               ______________________
                   Rosemarie B. Greco


Date:          March 15, 1999

<PAGE>   1
                                                                   Exhibit 23.11

                          CONSENT OF Howard B. Culang

     The undersigned hereby consents to the inclusion of his name in the Joint 
Proxy Statement/Prospectus constituting a part of this Registration Statement 
on Form S-4 as a person to become a director of Radian Group Inc. upon 
consummation of the merger of Amerin Corporation with and into CMAC Investment 
Corporation, which at the effective time of the merger will be renamed Radian 
Group Inc.


Signature:     /s/ Howard B. Culang
               ______________________
                   Howard B. Culang


Date:          May 5, 1999

<PAGE>   1
                                                                    Exhibit 99.1

[ ]

                           CMAC INVESTMENT CORPORATION
                  PROXY FOR THE SPECIAL MEETING OF STOCKHOLDERS
                            TO BE HELD JUNE 9, 1999

                  SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS

    The undersigned hereby authorizes Frank P. Filipps, Howard S. Yaruss, and C.
Robert Quint, and each of them, individually, with power of substitution, to
vote and otherwise represent all of the shares of Common Stock of the CMAC
Investment Corporation, (the "Company"), held of record by the undersigned, at
the Special Meeting of Stockholders of the Company to be held at the offices of
Morgan, Lewis & Bockius LLP, 1701 Market St., Philadelphia, PA 19103, on June 9,
1999 at 10:00 a.m. local time, and any adjournment(s) thereof, as indicated on
the reverse side hereof.

    The undersigned acknowledges receipt of the Notice of Special Meeting of
Stockholders and Proxy Statement dated in each case May 6, 1999. All other
proxies heretofore given by the undersigned to vote shares of the Company's
Common Stock are expressly revoked.

    THE SHARES REPRESENTED BY THIS PROXY WILL BE VOTED AS DESCRIBED ON THE
REVERSE HEREOF BY THE STOCKHOLDER. IF NOT OTHERWISE DIRECTED, THIS PROXY WILL BE
VOTED FOR THE PROPOSALS REFERRED TO IN ITEMS 1 AND 2.

                                        CMAC INVESTMENT CORPORATION
                                        P.O. BOX 11024 
                                        NEW YORK, N.Y. 10203-0024


1.   Approval of the Agreement and Plan of Merger, dated as of November 22,
     1998, as amended, between Amerin and CMAC, pursuant to which Amerin and
     CMAC will merge, and the related issuance of shares of CMAC common stock
     and the amendment and restatement of CMAC's Certificate of Incorporation.


                         FOR [ ] AGAINST [ ] ABSTAIN [ ]


2.   Approval of an additional 1,000,000 shares of CMAC common stock for
     issuance under the CMAC Equity Compensation Plan and an increase in the
     maximum number of options to purchase shares that a grantee may receive in
     any one calendar year under the plan from 75,000 shares to 150,000 shares.

                         FOR [ ] AGAINST [ ] ABSTAIN [ ]


3.   To transact such other business as may properly come before the special
     meeting.

 

                                        Change of Address and
                                        or Comments Mark Here [ ]


                                        Please sign exactly as name or names
                                        appear on this proxy. If stock is held
                                        jointly, each holder should sign. If
                                        signing as attorney, trustee, executor,
                                        administrator, custodian, guardian, or
                                        authorized officer, please give full
                                        title.


                                        DATED____________________________, 1999

                                        SIGNED_________________________________


                                        _______________________________________


                                        VOTES MUST BE INDICATED
                                        (X) IN BLACK OR BLUE INK.   X 

SIGN, DATE AND RETURN THE PROXY CARD PROMPTLY USING THE ENCLOSED ENVELOPE.

<PAGE>   1
                               AMERIN CORPORATION

                        SPECIAL MEETING OF STOCKHOLDERS

                            WEDNESDAY, JUNE 9, 1999
                                   9:00 A.M.

                             CORPORATE HEADQUARTERS
                            200 EAST RANDOLPH DRIVE
                               CHICAGO, IL 60601



          AMERIN CORPORATION
[AMERIN]  200 EAST RANDOLPH DRIVE, CHICAGO, IL 60601                       PROXY
          ----------------------------------------------------------------------

THIS PROXY IS SOLICITED BY THE BOARD OF DIRECTORS FOR USE AT THE SPECIAL
MEETING ON JUNE 9, 1999.

The shares of stock you hold in your account or in a dividend reinvestment
account will be voted as you specify below.

If no choice is specified, the proxy will be voted "FOR" the proposal.

By signing the proxy, you revoke all prior proxies and appoint Gerald L.
Friedman, Roy J. Kasmar and Randolph C. Sailer II, and each of them, with full
power of substitution, to vote your shares on the matters shown on the reverse
side and any other matters which may come before the Special Meeting and all
adjournments.



                      See reverse for voting instructions.

<PAGE>   2
VOTE BY MAIL

Mark, sign and date your proxy card and return it in the postage-paid envelope
we've provided or return it to Amerin Corporation, c/o Norwest Shareowner
Services(SM), P.O. Box 64873, St. Paul, MN 55164-9397.



                  [DOWN ARROW] Please detach here [DOWN ARROW]

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


                 THE BOARD OF DIRECTORS RECOMMENDS A VOTE FOR:


Approval of the merger of Amerin        / / For     / / Against     / / Abstain
Corporation ("Amerin"), a Delaware
corporation, with and into CMAC
Investment Corporation ("CMAC"), a
Delaware corporation, pursuant to the
terms and conditions of the Agreement
and Plan of Merger dated as of November
22, 1998 between Amerin and CMAC, as amended.

THIS PROXY WHEN PROPERLY EXECUTED WILL BE VOTED AS DIRECTED OR, IF NO DIRECTION
IS GIVEN, WILL BE VOTED FOR THE PROPOSAL


Address Change? Mark Box / /                     Date
Indicated changes below:                             --------------------------


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


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

                                        Signature(s) in Box
                                        Please sign exactly as your name(s)
                                        appear on Proxy. If held in joint
                                        tenancy, all persons must sign.
                                        Trustees, administrators, etc., should
                                        include title and authority.
                                        Corporations should provide full name
                                        or corporation and title of authorized
                                        officer signing the proxy.



© 2022 IncJournal is not affiliated with or endorsed by the U.S. Securities and Exchange Commission