Models are very important as they enable aspects of the system, i.e., objects, events, or ideas which are either complex, or on a different scale to that which is normally perceived, or abstract to become either visible or more readily visible.

Models are also very important in scientific research in formulating hypotheses to be tested and describing scientific phenomena. 

Recently, the need of a theory of model-based teaching and learning (MBTL) came out due to the cognition of the importance of models in physics education and research.

One of the challenges up to now is that there is no coherent theory that outlines the cognitive processes involved in model-based learning and even there are no any coherent theories of how model-based teaching should be approached.

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