The Physics Tutor is a prototype intelligent tutoring system (ITS) built with “off-the-shelf” software in order to test the utility, practicality, and generalizability of the ITS concept. The tutorial information is accessed through a semantically structured hypertext which enables students to browse through the knowledge base, secure examples, and quiz themselves with practice items. The student model and expert model are encoded in several hundred rules that are evaluated by a commercial expert system shell. The output of the expert system knowledge bases is a judgment about the learners level of conceptual development and some tutorial strategies for remediating deficiencies. Because of the slowness of the system, and the enormous amount of required development time, the practicality of ITSs is called into question.
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