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Rational Software

defunct software company
Organization business Q1493633
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Rational Software

Summary

Rational Software is a business[1]. It has Wikipedia articles in 9 language editions, a strong signal of global cultural recognition.[2]

Key Facts

  • Rational Software's instance of is recorded as business[3].
  • Rational Software's founder is recorded as Mike Devlin[4].
  • 1991 marks the founding of Rational Software[5].
  • 1981 marks the founding of Rational Software[6].
  • Rational Software was dissolved in 2003[7].
  • Rational Software's parent organization or unit is recorded as IBM[8].
  • Rational Software's official website is recorded as http://www-01.ibm.com/software/rational/?S_TACT=105AGY59&S_CMP=13&ca=dtl-13[9].
  • Rational Software's product or material produced is recorded as software[10].

Body

Founding

Rational Software's founder is recorded as Mike Devlin[4]. Recorded inception include 1991[5] and 1981[6].

Operations

Rational Software's parent organization or unit is recorded as IBM[8].

Ownership

Rational Software's product or material produced is recorded as software[10].

Dissolution

Rational Software was dissolved in 2003[7].

Why It Matters

Rational Software has Wikipedia articles in 9 language editions, a strong signal of global cultural recognition.[2] It is known by 4 alternative names across languages and contexts.[11]

Related Entities

business IBM R1000 software

References

Programmatic citations — every numbered marker resolves to a verifiable graph row below.

Direct Wikidata claims

  1. [3] ↑ . wikidata.org.
  2. [4] ↑ . wikidata.org.
  3. [5] ↑ . wikidata.org.
  4. [6] ↑ . wikidata.org.
  5. [7] ↑ . wikidata.org.
  6. [8] ↑ . wikidata.org.
  7. [9] ↑ . wikidata.org.
  8. [10] ↑ . wikidata.org.

Class ancestry

  1. [1] ↑ . Wikidata. wikidata.org.

Aggregate / graph-position facts

  1. [2] ↑ . Wikidata sitelinks. wikidata.org.
  2. [11] ↑ . Wikidata aliases. wikidata.org.

📑 Cite this page

Use these citations when quoting this entity in research, articles, AI prompts, or wherever provenance matters. We aggregate Wikidata + Wikipedia + authoritative open-data sources; the stitched, scored, cross-referenced view is what 4ort.xyz contributes.

APA 4ort.xyz Knowledge Graph. (2026). Rational Software. Retrieved April 10, 2026, from https://4ort.xyz/entity/rational-software
MLA “Rational Software.” 4ort.xyz Knowledge Graph, 4ort.xyz, 10 Apr. 2026, https://4ort.xyz/entity/rational-software.
BibTeX @misc{4ortxyz_rational-software_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{Rational Software}}, year = {2026}, url = {https://4ort.xyz/entity/rational-software}, note = {Accessed: 2026-04-10}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): Rational Software — https://4ort.xyz/entity/rational-software (retrieved 2026-04-10)

Canonical URL: https://4ort.xyz/entity/rational-software · Last refreshed:

Edit History

Rolling log of changes to this entity's Wikidata record. Values shown reflect the current state of each edited property — follow the history link to see the precise diff for any edit.

  1. 14h ago · Trivialist · 2026-08-22 view diff on Wikidata ↗
    P14750 → A87B-CC80-E0BC-E6C5-7B13
    Instance of → business
    Facebook username → ibmrational
    User manual url → https://www.ibm.com/docs/en/sd-and-lp/1.0.1?topic=SSUKF8_1.0.1/com.ibm.help.comm
    "/* wbcreateclaim-create:1| */ [[Property:P14750]]: A87B-CC80-E0BC-E6C5-7B13, [[:toollabs:quickstatements/#/batch/269254|batch #269254]]"
  2. 16w ago · Aavindraa · 2026-05-01 view diff on Wikidata ↗
    Dissolved → —
    Dissolved, abolished or demolished date → +2003-00-00T00:00:00Z
    Founder → Mike Devlin
    Inception → —
    + 12 other properties edited (see Wikidata diff for full list)
    "/* wbsetclaim-create:2||1 */ [[Property:P2002]]: ibmrational"
Live feed via Wikidata EventStreams. New edits appear within minutes of being made on Wikidata.