According to W. Therber, the four types of models are:

Physical Models: These are tangible representations of objects, systems, or concepts, often used in science and engineering.
Mathematical Models: These are mathematical representations or equations used to describe the behavior or characteristics of a system.
Graphic Models: These include diagrams, charts, or maps used to represent information visually.
Verbal Models: These are descriptions or narratives used to convey information or ideas.

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