Image: Wikimedia Commons

Rational Software

Defunct software company

Companybusiness proprietary softwareQ1493633

Also known as IBM Rational · IBM Rational Application Developer for WebSphere Software · Rational Application Developer for WebSphere Software

Founded: 1991
, 1981
Founded by: Mike Devlin
Parent: IBM

Overview

From Wikipedia, the free encyclopedia · Read full article · Text CC BY-SA 4.0

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 to IBM on February 21, 2003.

Overview

Products

1 linked to Rational Software in Wikidata

R10001985 · Rational R1000 Development System

Developed

1 linked to Rational Software in Wikidata

RRational Synergy1990 · software configuration manager

All data

19 statements · 21% with external sources · numbers in brackets are citations

Dissolved: 2003
Product or material produced: software

On other databases

9 identifiers linking Rational Software across the web's reference databases

Data quality

statements

21%

externally sourced

Source last edited August 22, 2026. AIDB refreshes this page daily.

Suggest a fact or correction

Links

Use this data

curl https://aidb.si/api/v1/entities/Q1493633

API docs, limits & keys

Cite this page

AIDB. (2026). Rational Software (Q1493633). Retrieved from https://aidb.si/e/rational-software-Q1493633