Production rules used to build a problem-solving system and a tutorial interface that controls interaction between user and system are described. The tutorial interface controls the rule- based problem solver used to emulate a student's steps, while the system provides a flexible framework for algebraic problem solving. (Author/MBR)

Presents a series of six prescriptions for constructing an authoring system that guides the instructional design process used to create computer-based lessons. The importance of providing opportunities for dynamic interaction between the program and the student is emphasized. (Author/LRW)