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Rational Software

Rational Software was an independent Software development company until 2003, when it was bought by IBM. Most of its products involved modelling and aiding in software development and maintenance.

=History=

Rational Software was founded by Paul Levy and Mike Devlin in 1980/1981 as a developer of software development tools. The product Rational went into business difficulties and IBM acquired it in February 2003, incorporating it into the IBM Software Group Division where it became the fifth brand, alongside Websphere, Tivoli Framework, DB2, and Lotus Software.

=Rational products=

==Rose==

Rose, a software modeling program, arose from a few engineers formerly at General Electric in Waukesha, Wisconsin. After Rational acquired the product, it moved much of the development to California.

Rational developed and maintained Rose, afterwards called Rational Rose, as a flagship product.

Rose originated to support Ada programming language programming. It currently supports C plus plus and Java programming language. Unlike many programming artifacts, which developers retain and maintain, Rose Models merely form a stage in the development of a program; hence designers and programmers can discard them after a few uses, because they can re-generate them from the developed program, using round-trip engineering.

==RealTime==

Rose RealTime originated to support the development of complex reactive systems, typically ones written in C programming language, C++ and Java programming language. It combines the Real-Time Object Oriented Modeling (ROOM) method developed by Bran Selic at ObjecTime Corp, and the UML capabilities from Rational Rose. Rose RealTime supports a model-driven development approach that uses forward engineering to generate, directly from a UML model, up to 90% of the real-time application code found in telecommunications switches and industrial controllers. By annotating the UML model with action code, the model can produce 100% of the application code.

ObjecTime developed the original product in Kanata, Ontario, Canada prior to its acquisition by Rational Software on December 14 1999.

== Various products ==

Rational also acquired memory debugger Purify, software configuration management (SCM) tool Rational ClearCase, Requirements and use case management tool Rational RequisitePro, and software testing tool Rational ClearQuest. Other Rational products included the automated documentation tool: SoDA - Software Documentation Automation.

After Microsoft developed Visual Test, Rational purchased the product rights.

=External links=

*[http://www-306.ibm.com/software/rational/ IBM s Rational software site] *[http://www-306.ibm.com/software/awdtools/developer/technical Rose RealTime] *[http://www.developer.com/java/other/article.php/607781 Article on Grady Booch]