H. PRAEHOFER resumes as follows T. ÖREN's taxonomy of models "… for which he uses the following classification criteria: time set of the model, trajectory of descriptive variables, existence and range of variables, functional relations of variables, spatial distribution, organization of component models, and goals to be pursued…
"According to the criteria time, we speak of continuous-time models when time is represented by real numbers and we speak of discrete-time models when time is represented by integers or a set isomorphic to the integers. According to the second criteria, we speak of continuous change models when state changes occur continuously over time and we speak of discrete-change models when they occur in discrete jumps. Pairwise combinations of one category for each criteria define wellknown modeling concepts. Continuous-time and continuous-change models are differential equations specified models, discrete-time and continuous-change models are difference equation specified models, discrete-time and discrete-change models are automaton models, and discrete-change and continuous-time models represent the class of discrete event models".
Practically: "The real system is regarded to be nothing more than a source of data. The model is a set of instructions capable of generating such data and the computer is a means of carrying out these instructions to generate such data.
"A direct relation exists between the real system and the model and is summarized by the term modeling. A direct relation between the model and the computer exists and this relation can be denoted as simulation" (1991, p 287-289)
- 1) General information
- 2) Methodology or model
- 3) Epistemology, ontology and semantics
- 4) Human sciences
- 5) Discipline oriented
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Bertalanffy Center for the Study of Systems Science (2020). Title of the entry. In Charles François (Ed.), International Encyclopedia of Systems and Cybernetics (2). Retrieved from www.systemspedia.org/[full/url]
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