Model (glossary)
(1) A physical, mathematical, or otherwise logical representation of a system, entity, phenomenon, or process (DoD Directive 5000.59 1994)
(2) A representation of one or more concepts that may be realized in the physical world (Friedenthal, Moore, Steiner 2009)
(3) A simplified representation of a system at some particular point in time or space intended to promote understanding of the real system (Bellinger 2004)
(4) An abstraction of a system, aimed at understanding, communicating, explaining, or designing aspects of interest of that system (Dori 2002)
(5) A selective representation of some system whose form and content are chosen based on a specific set of concerns. The model is related to the system by an explicit or implicit mapping. (Object Management Group 2010)
Source
To be copied from "What is a model?"
Discussion
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