AUTHORING INSTRUCTIONAL EXPERTISE IN KNOWLEDGE-BASED TUTORS

Our contribution to the Special Issue on the GTE system begins with a response to five major claims made in Van Marcke's paper on GTE. We fo llow with a description of a system called Eon, a suite of authoring t ools for intelligent tutoring systems (ITS), which we are developing i n our lab. Next we discuss several general issues in ITS authoring sys tems as they pertain to GTE, Eon, and other systems, including who the intended audience is, where instructional expertise comes from, trade offs between generality and inferencing power, managing complexity for users, and the use of ''knowledge types.'' Finally, we suggest severa l areas for synergy and future work for GTE and Eon.