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((Short description|Defunct software company))
((More citations needed|date=October 2020))
((Update|part=article|date=July 2023))((Infobox company
| name             = Rational Software
| logo             = [[File:RationalSoftware.png|180px|Rational Software]]
| type             =
| genre            =
| fate             = Acquired by [[IBM]]
| predecessor      =
| successor        =
| foundation       = ((Start date|1981))
| founder          = Paul Levy and [[Mike Devlin (entrepreneur)|Mike Devlin]]
| defunct          = ((End date|2003|02|20))
| location_city    =
| location_country =
| location         =
| locations        =
| area_served      =
| key_people       = [[Mike Devlin (entrepreneur)|Mike Devlin]] (previous CEO)
| industry         = Application development tools
| products         =
| services         =
| revenue          =
| operating_income =
| net_income       =
| aum              =
| assets           =
| equity           =
| owner            =
| num_employees    =
| parent           =
| divisions        =
| subsid           =
| homepage         = ((URL|https://www.ibm.com/software/uk/rational/))
| footnotes        =
| intl             =
))((About-distinguish|the software company that specializes in software architecture solutions|Rational Systems))
'''Rational Machines''' is an enterprise founded by Paul Levy and [[Mike Devlin (entrepreneur)|Mike Devlin]] in 1981 to provide tools to expand the use of modern software engineering practices, particularly [[Modular programming|explicit modular architecture]] and [[Iterative and incremental development|iterative development]]. It changed its name in 1994 to '''Rational Software''', and was sold for US$2.1 billion (equivalent to current US$((Format price|((Inflation|US|2100000000|2003))))((Inflation-fn|US))) to [[IBM]] on February 20, 2003.

==See also==
((div col|colwidth=22em))
*[[Rational Automation Framework]]
*[[Rational ClearCase]]
*[[Rational DOORS]]
*[[Rational Performance Tester]]
*[[Rational Rhapsody]]
*[[Rational Rose]]
*[[Rational Software Modeler]]
*[[Rational Synergy]]
*[[Rational Unified Process]]
((div col end))

==References==
((Reflist))

==External links==
((URL|https://jazz.net/products/rational-team-concert))

((IBM))
((Authority control))

[[Category:Defunct software companies of the United States]]
[[Category:IBM acquisitions]]

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