**IDEFs approach to capturing Domain Ontologies.** IDEF5 is an [[Ontology Language]] that’s half graphical and half textual. The graphical portion of IDEF5 is essentially the exact same as [[IDEF3]].  It’s a worse version of [[OWL]]. I wonder if it was ever once used in practice, or just ideated by folks who got a grant. **** # More ## Source - [IDEF5 - Ontology Description Capture Method - IDEF](https://www.idef.com/idef5-ontology-description-capture-method/) ## Related - [[Ontology]] - [[Ontology Language]] - [[IDEF3]]