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<p>A computer program, APEX, is proposed to investigate idealized formal models representing physics problems. Two types of models are defined: canonical physical objects and physical models. During problem solving, the problem is represented as a data connection network, which is progressively augmented by these models in the form of additional network elements. APEX employs views as a representational framework for connecting the initially informal objects to the formal models of the domain. The view framework supports multiple representations (e.g., viewing many objects as a single canonical physical object), handling of incompletely specified problems, and invertibility of the views. This computational framework provides a powerful representational mechanism that allows a finite set of physical principles to be applied to a potentially infinite variety of problems. As a knowledge engineering technique, views allow general principles to be applied to a variety of objects whose representations differ.</p>
models representation; expert problem solving; physics; computer program; APEX; idealized formal models; canonical physical objects; physical models; data connection network; representational framework; multiple representations; knowledge engineering; expert systems; knowledge representation; physics computing

G. Novak, Jr. and H. Kook, "Representation of Models for Expert Problem Solving in Physics," in IEEE Transactions on Knowledge & Data Engineering, vol. 3, no. , pp. 48-54, 1991.
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