The functional model is an overview of what the system is supposed to do.
Kind of (current) summary:
IDEF0 (abbreviation of “Icam DEFinition for Function Modeling”, where ICAM is an acronym for “Integrated Computer Aided Manufacturing”)
Hence,
IDEF0 is a functional modeling standard, that is, it is a graphical activity description language for the analysis, development, reengineering and integration of information systems or business processes.
--as well:
IDEF0 stands for Integration Definition for Process Modelling, a public-domain methodology used to model businesses and their processes so they can be understood and improved. It's a type of flowchart diagram.
https://support.microsoft.com/en-us/office/create-idef0-diagrams-ea7a9289-96e0-4df8-bb26-a62ea86417fc#:~:text=IDEF0%20stands%20for%20Integration%20Definition,a%20type%20of%20flowchart%20diagram.
And, some old (historical - from last millennium) related info summary can be seen in 1993:
National Institute of Standards and Technology (.gov)
"Integration definition for function modeling (IDEF0)"
https://nvlpubs.nist.gov › FIPS › fipspub183
https://nvlpubs.nist.gov/nistpubs/Legacy/FIPS/fipspub183.pdf
Dec 21, 1993 — This publication (FIPS 183) is effective June 30,. 1994.
https://nvlpubs.nist.gov/nistpubs/Legacy/FIPS/fipspub183.pdf
And, above-there there is some really ancient info saying something (from 1970's) about IDEF0, IDEF1, IDEF2, IDEF1X ...
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