Rational Software

Rational Machines was founded by Paul Levy and Mike Devlin in 1981 to provide tools to expand the use of modern software engineering practices, particularly explicit modular architecture and iterative development. It changed its name in 1994 to Rational Software, and was sold for US$2.1 billion (equivalent to current US$2.95 billion[1]) to IBM on February 20, 2003.

Rational Software
IndustryApplication development tools
Founded1981 (1981)
FounderPaul Levy and Mike Devlin
DefunctFebruary 20, 2003 (2003-02-20)
FateAcquired by IBM
Key people
Mike Devlin (previous CEO)

See alsoEdit


  1. ^ 1634 to 1699: McCusker, J. J. (1992). How Much Is That in Real Money? A Historical Price Index for Use as a Deflator of Money Values in the Economy ofthe United States: Addenda et Corrigenda (PDF). American Antiquarian Society. 1700-1799: McCusker, J. J. (1992). How much is that in real money?: a historical price index for use as a deflator of money values in the economy of the United States (PDF). American Antiquarian Society. 1800–present: Federal Reserve Bank of Minneapolis. "Consumer Price Index (estimate) 1800–". Retrieved January 1, 2020.

External linksEdit