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                         Rational Software Corporation
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                           Filed by International Business Machines Corporation
                                                        Pursuant to Rule 14a-12
                                         of the Securities Exchange Act of 1934

                                Subject Company:  Rational Software Corporation
                                                Commission File No.:  000-12167



Q. WHAT DID IBM ANNOUNCE TODAY?

A. IBM and Rational Software Corp. today announced the two companies have
entered into a definitive agreement for IBM to acquire the equity of Rational
at a price of approximately $2.1 billion in cash or $10.50 per share.



Q. WHAT DOES RATIONAL DO?

A. Rational provides open, industry standard tools, best practices and
services used to develop business applications and to build software products
and systems, including embedded software for devices such as cell phones and
medical systems.



Q. WHY IS THIS GOOD FOR IBM CUSTOMERS?

A. IBM now will provide a complete environment to build an on demand
e-business for those companies who want to integrate their business processes
and software infrastructure across the company, with suppliers, customers and
employees. This requires the integration of data management, systems
management, collaboration, transaction and business process integration
middleware and software development. With this acquisition, IBM has leadership
in each of these key segments, including software development.



Q. WHY DID IBM ACQUIRE RATIONAL? HOW DOES IT FIT INTO IBM'S OVERALL SOFTWARE
STRATEGY?

A. Adding Rational to IBM strengthens IBM's "On Demand" computing strategy and
provides IBM's customers with a complete solution for creating an integrated
e-business.

     o    An integrated e-business requires integrated data management,
          transaction and business process management, collaboration, systems
          management and security, and application development.

     o    IBM now has the broadest support for software development
          environments. The combined IBM/Rational solutions will assist
          customers who are developing business applications on J2EE or
          Microsoft.NET as well customers building technical software
          products and systems.

     o    IBM can leverage its presence in enterprise IT organizations to
          accelerate Rational's penetration into that space, and Rational
          brings leadership in the technical software products and systems
          areas.


Q. IS RATIONAL A LEADER IN ITS INDUSTRY?

A. Rational provides a software development platform that can improve the
speed, quality and predictability of software projects. Ninety-eight of the
Fortune 100, including IBM, use Rational tools and services.



Q. WHERE IS RATIONAL HEADQUARTERED?

A. Rational has headquarters in Cupertino, California, and Lexington,
Massachusetts. Rational has more than 3,400 employees and customers in 89
countries.




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Q. WHERE WILL RATIONAL FIT IN THE IBM ORGANIZATION?

A. Upon closing the deal, IBM intends to merge Rational's business operations
and employees into the IBM Software Group as a new division and fifth brand,
joining WebSphere, Lotus, Tivoli and DB2. After closing, Mike Devlin, Rational
CEO, will become general manager of the new division reporting to Steve Mills,
IBM senior vice president and group executive, Software Group.



Q. DID IBM AND RATIONAL HAVE A RELATIONSHIP PRIOR TO THE ACQUISITION?

A. Yes. The relationship began shortly after Rational's founding in 1981, IBM
became a customer in 1985 and the two companies formed a strategic alliance in
1999.



Q. HOW WILL RATIONAL'S PRODUCTS BE SOLD?

A. After the deal closes, IBM will market and sell Rational's application
development offerings worldwide through the Rational sales force, which will
become part of the IBM sales force team.



Q. WHEN WILL THE ACQUISITION CLOSE?

A. The acquisition is subject to customary closing conditions, including
Rational stockholder and government regulatory approvals. IBM and Rational
anticipate closing in the first quarter of 2003.



Q. HOW DO RATIONAL'S PRODUCTS, PROCESSES AND SERVICES HELP TO UNIFY THE MIXED
ENVIRONMENTS THAT CUSTOMERS DEAL WITH TODAY?

A. Independent of the type of software being built, most application
development projects suffer from common issues; Rational's solution address
those issues in a common way across different environments but also provides
specialized support in different environments. For example, software projects
need a repeatable process, requirements management, good architecture,
software configuration management, and testing - Rational brings all that. And
Rational also provides specialized solutions for J2EE, .Net, and
real-time/embedded projects.

It is IBM's intent to grow the Rational based revenue stream in all major
sectors that Rational participates in today. For example, IBM has a pervasive
technologies organization that supports the development of solutions for
embedded devices and real time solutions. IBM intends to further this business
through it's alignment with Rational's real time solutions.


Q. IS IBM COMMITTED TO SUPPORTING MICROSOFT.NET?

A. IBM intends to continue the support for Rational's products which provide
the application lifecycle management process and tools for the Microsoft.Net
environment. The largest segment of the market will have a heterogeneous IT
environment consisting of open systems such as Java and Linux, legacy systems,
Microsoft.NET and other proprietary software platforms. It is IBM's strategy
to provide the best support for customers with heterogeneous IT environments.
With this acquisition, IBM will have the broadest support for software
development environments. The combined IBM/Rational solutions assist customers
who are developing and deploying software on J2EE or Microsoft.NET as well
customers building technical software products and systems.

For example, after closing, IBM plans to continue development and evolution of
the tools that integrate and compliment the Visual Studio .NET development




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environment. Current product lines that allow for round-trip engineering with
..NET languages (XDE - C#, VB.NET, ASP.NET) and integration with the CLR
(PurifyPlus) intend to continue to be a core component of the complete
life-cycle solution for Enterprise development teams.

Rational support for technical software products is critical to the completion
of the "On Demand" vision. The end point of many applications is likely to be
an embedded device, such as a cell phone or the console of commercial product.
With Rational, IBM can provide the end to end software development and
integration solutions that customers require.

IBM will provide a complete environment to build an on demand e-business for
those companies who want to further integrate their business processes and
software infrastructure across the company, with suppliers, customers and
employees. This requires the integration of data management, systems
management, collaboration, transaction and business process integration
middleware and software development. These software capabilities must be
available on multiple platforms such as .NET, Java and embedded devices, from
multiple vendors as well as be able to be implemented in an end to end
integrated solution.

IBM plans to deliver the most complete solution for building an integrated
e-business. IBM's application development solution would support the broadest
range of software environments, including business applications on J2EE or
..NET, as well as technical software products and systems.



Q. WILL THIS ACQUISITION JEOPARDIZE IBM RELATIONSHIP WITH MICROSOFT?

A. No. Microsoft and IBM have a long-term relationship delivering excellent
tools. IBM delivers software across a wide range of platforms and
technologies. IBM intends to continue support for Microsoft environments for
as long as they continue to be important to our customers


Q. HOW CAN IBM REASSURE MICROSOFT ISVS THAT IBM WILL CONTINUE TO SUPPORT THEM?

A: It is IBM's intention to continue strong relationships with Microsoft ISVs
and other ISVs. IBM is strongly committed to open standards. It is in IBM's
interest to grow our business from Rational products that are used by these
ISV's.



Q. IS IBM COMMITTED TO SUPPORTING THE EMBEDDED MARKETS?

A. Rational is a leader and has a deep heritage with customers building
software for technical software products and systems. IBM intends to continue
to support those customers and invest in our solution to help them build
better software faster. Part of IBM's interest in Rational is the fact that
Rational can take IBM into customers and markets in which we have not
traditionally been strong. This acquisition will accelerate IBM's penetration
into these types of customers.

IBM's pervasive computing division supports the development of solutions for
embedded devices and real time solutions. IBM intends to further this business
through it's alignment with Rational's real time solutions. For example,
WebSphere Micro Environment supports over 40 different platforms including:

     o    Microsoft - PocketPC 2002, PocketPC 2002 Phone Edition, Windows
          Powered Smartphone 2002, Windows CE
     o    PalmOS
     o    QSSL - QNX
     o    Linux - MontaVista Hard Hat Linux
     o    ITron, Red Hat Linux,
     o    Qualcomm BREW and Rex
     o    AIX, Solaris





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On a variety of different hardware platforms

     o    Intel - PCA, X86, Pentium, StrongARM (SA-1110) and Xscale
     o    PowerPC
     o    NEC MIPS
     o    Hitachi SH3 and SH4
     o    Motorola 68K
     o    ARM






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     In connection with the merger, Rational has filed preliminary proxy
materials and has filed and will file other relevant documents concerning the
transaction with the Securities and Exchange Commission (SEC). STOCKHOLDERS OF
RATIONAL ARE URGED TO READ THE DEFINITIVE PROXY STATEMENT AND ANY OTHER
RELEVANT DOCUMENTS FILED WITH THE SEC WHEN THEY BECOME AVAILABLE BECAUSE THEY
CONTAIN IMPORTANT INFORMATION. Investors and security holders can obtain free
copies of the definitive proxy statement and other documents when they become
available by contacting Investor Relations, Rational Software Corporation,
18880 Homestead Road, Cupertino, CA 95014 (Telephone: (408) 863-9900). In
addition, documents filed with the SEC by Rational are available free of
charge at the SEC's web site at www.sec.gov.

     Information regarding the identity of the persons who may, under SEC
rules, be deemed to be participants in the solicitation of stockholders of
Rational in connection with the transaction, and their interests in the
solicitation, is set forth in the preliminary proxy materials that were filed
by Rational with the SEC on December 11, 2002.

Forward-Looking Statements

     Except for historical information contained herein, statements contained
in this document may constitute "forward looking statements" within the
meaning of the Private Securities Litigation Reform Act of 1995. These
statements are neither promises nor guarantees, but involve a number of risks,
uncertainties and other factors that could cause actual results to differ
materially from those set forth in the forward-looking statements, including,
without limitation, the risk that the merger may not be consummated in a
timely manner, if at all, risks regarding employee relations and other risks
concerning IBM and Rational and their respective operations that are detailed
in the periodic filings with the SEC of IBM and Rational, including their most
recent filings on Form 10-K or Form 10-Q.