Which IDEF model is aimed at ontology description?

IDEF5 is specifically designed for the purpose of ontology description. It provides a framework for defining and representing the concepts, relationships, and constraints of a certain domain in a structured way. This model facilitates the capture of knowledge in a format that can be easily shared and used across different systems and applications.

The focus of IDEF5 is on the semantics of the entities within a domain, allowing for better understanding and communication of complex information. It emphasizes the relationships between concepts, thereby creating a rich ontology that can be utilized for various applications in systems engineering.

In contrast, other IDEF models serve different functions. For example, IDEF1 is focused on data modeling, IDEF4 is aimed at software architecture, and IDEF2 deals with functional modeling. Each of these serves unique purposes, but they do not primarily focus on the ontology description like IDEF5 does.