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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 ranks in the top 4% of business entities by monthly Wikipedia readership (43 views/month).[2]

Key Facts

  • Rational Software's instance of is recorded as business[3].
  • Rational Software's founder is recorded as Mike Devlin[4].
  • Rational Software's logo image is recorded as RationalSoftware.png[5].
  • Rational Software's ISNI is recorded as 0000000122321719[6].
  • Rational Software's VIAF cluster ID is recorded as 158441794[7].
  • Rational Software's Library of Congress authority ID is recorded as n96084293[8].
  • +1991-00-00T00:00:00Z marks the founding of Rational Software[9].
  • +1981-00-00T00:00:00Z marks the founding of Rational Software[10].
  • Rational Software was dissolved in +2003-00-00T00:00:00Z[11].
  • Rational Software's Freebase ID is recorded as /m/01xtmx[12].
  • Rational Software's parent organization or unit is recorded as IBM[13].
  • Rational Software's official website is recorded as http://www-01.ibm.com/software/rational/?S_TACT=105AGY59&S_CMP=13&ca=dtl-13[14].
  • Rational Software's product or material produced is recorded as software[15].
  • Rational Software's Quora topic ID is recorded as Rational-Software[16].
  • Rational Software's National Library of Israel J9U ID is recorded as 987007328687705171[17].

Body

Founding

Rational Software's founder is recorded as Mike Devlin[4]. Recorded inception include +1991-00-00T00:00:00Z[9] and +1981-00-00T00:00:00Z[10].

Operations

Rational Software's parent organization or unit is recorded as IBM[13].

Ownership

Rational Software's product or material produced is recorded as software[15].

Dissolution

Rational Software was dissolved in +2003-00-00T00:00:00Z[11].

Why It Matters

Rational Software ranks in the top 4% of business entities by monthly Wikipedia readership (43 views/month).[2] It has Wikipedia articles in 9 language editions, a strong signal of global cultural recognition.[18] It is known by 4 alternative names across languages and contexts.[19]

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] ↑ . Virtual International Authority File. Retrieved . wikidata.org.
  7. [9] ↑ . wikidata.org.
  8. [10] ↑ . wikidata.org.
  9. [11] ↑ . wikidata.org.
  10. [12] ↑ . Freebase Data Dumps. wikidata.org.
  11. [13] ↑ . wikidata.org.
  12. [14] ↑ . wikidata.org.
  13. [15] ↑ . wikidata.org.
  14. [16] ↑ . Quora. wikidata.org.
  15. [17] ↑ . National Library of Israel Names and Subjects Authority File. wikidata.org.

Class ancestry

  1. [1] ↑ . Wikidata. wikidata.org.

Aggregate / graph-position facts

  1. [2] ↑ . Wikimedia Foundation. dumps.wikimedia.org.
  2. [18] ↑ . Wikidata sitelinks. wikidata.org.
  3. [19] ↑ . 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. 19d 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.