Which IDEF methodology is used for functional modeling?

IDEF0 is the methodology utilized for functional modeling. This approach focuses on depicting the functions or processes of a system in a clear and organized manner, providing insights into what the system does and how its various components interact. IDEF0 allows for the creation of functional decomposition diagrams that capture the hierarchical structure of functions, using inputs, outputs, controls, and mechanisms to illustrate the relationships and flow of information between functions.

This methodology is particularly valuable for stakeholders who wish to grasp the operational aspects of a system without delving into technical details. Its structured format facilitates communication among team members and across disciplines, enhancing understanding and collaboration during the system development process. Other methodologies, while valuable in their own contexts, serve different purposes; for example, IDEF1X is primarily focused on data modeling, IDEF3 on process description, and IDEF5 on ontology.