Outlines technological and cognitive considerations in the selection of authoring systems for writing computer-assisted instruction (CAI) lessons. Topics discussed include hardware selection; documentation; text display; screen appearance; branching and sequencing; text editing; graphics; animation; sound and voice input and output; student…

Discussion of the educational effectiveness of textbooks focuses on a model of a virtual textbook that relies on hypermedia. Highlights include changing roles of teachers, students, and content; systemwide features of the virtual textbook, including interface and object-oriented design; classroom environment; sequencing; and a prototype. (Contains…