# Recommendation X.200 (11/1988): Reference Model of Open Systems Interconnection for CCITT applications

> superseded recommendation/international standard from the International Telecommunication Union

**Wikidata**: [Q26932295](https://www.wikidata.org/wiki/Q26932295)  
**Source**: https://4ort.xyz/entity/recommendation-x-200-11-1988-reference-model-of-open-systems-interconnection-for-ccitt-applications