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The Physics Tutor (Jonassen and Wang, 1994) is a prototype hypertext based 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.
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