Rational Software
Defunct software company
title: "Rational Software" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["defunct-software-companies-of-the-united-states", "ibm-acquisitions"] description: "Defunct software company" topic_path: "geography/united-states" source: "https://en.wikipedia.org/wiki/Rational_Software" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0
::summary Defunct software company ::
::data[format=table title="Infobox company"]
| Field | Value |
|---|---|
| name | Rational Software |
| logo | [[File:RationalSoftware.png |
| fate | Acquired by IBM |
| foundation | |
| founder | Paul Levy and Mike Devlin |
| defunct | |
| key_people | Mike Devlin (previous CEO) |
| industry | Application development tools |
| homepage | |
| :: |
| founder = Paul Levy and Mike Devlin | defunct = | location_city = | location_country = | location = | locations = | area_served = | key_people = 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 = | footnotes = | intl = Rational Machines was an enterprise 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$2.1 billion (equivalent to current US$) to IBM on February 21, 2003.
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::callout[type=info title="Wikipedia Source"] This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page. ::