The family of Integrated Definition Languages, short IDEF, were first developed in the 1970s and are standard modelling techniques nowadays. They cover a range of applications from function modelling to information, simulation, object-oriented analysis and design and knowledge acquisition. Specifically, IDEF(0) is a functional modelling language building on SADT, and IDEF(1x) addresses information models. IDEF(1x) was created by the U.S. Air Force based on ERDs.
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