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Object process methodology (OPM) is a conceptual modeling language and methodology for capturing knowledge and designing systems. Based on a minimal universal [[Ontology (computer science)|ontology]] of [[stateful]] [[Object (computer science)|object]]s and [[Process theory|process]]es that transform them, OPM can be used to formally specify the function, structure, and behavior of artificial and natural systems in a large variety of domains. Catering to human cognitive abilities, an OPM model represents the system under design or study bimodally in both graphics and text for improved representation, understanding, communication, and learning.
In OPM, an ''object'' is anything that does or does not exist. Objects are [[stateful]]—they may have states, such that at each point in time, the object is at one of its states or in transition between states. A ''process'' is a thing that transforms an object by creating or consuming it, or by changing its state.
OPM is bimodal; it is expressed both visually/graphically in object-process diagrams (OPD) and verbally/textually in Object-Process Language (OPL), a set of automatically generated sentences in a subset of English. A patented software package called OPCAT, for generating OPD and OPL, is freely available.<ref name="OPCAT">{{cite web |url=http://esml.iem.technion.ac.il/opcat-installation/ |title=Enterprise Systems Modeling Laboratory » OPCAT installation |website=technion.ac.il |access-date=3 May 2017}}</ref>
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