Abstract
This paper describes STAR, a system for stabilizing student knowledge in mixed initiative CAI application. The system characterizes knowledge as existing at three levels of stability: required, ambiguous or stable. The primary instructional objective of the system is to improve the stability level of student knowledge. The knowledge acquisition environment utilizes target domain knowledge and knowledge acquired from the student to generate a dynamic student model. The student model, in turn, guides the selection of appropriate instructional strategies. The operation of the system is demonstrated using an English vocabulary development activity.
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