In systems engineering, software engineering, and computer science, a function model or functional model is a structured representation of the functions (activities, actions, processes, operations) within the modeled system or subject area.[1]
Example of a function model of the process of "Maintain Reparable Spares" in IDEF0 notation.
A function model, similar with the activity model or process model, is a graphical representation of an enterprise's function within a defined scope. The purposes of the function model are to describe the functions and processes, assist with discovery of information needs, help identify opportunities, and establish a basis for determining product and service costs.[2]
^FIPS Publication 183 Archived 2009-02-27 at the Wayback Machine released of IDEFØ December 1993 by the Computer Systems Laboratory of the National Institute of Standards and Technology (NIST).
^Reader's Guide to IDEF0 Function Models. Accessed 27 Nov 2008.
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