This introduction presents a framework for discussing hypertext, previews individual articles, and discusses some relations of hypertext to library science. Historical notes are also provided, as well as biographical information on the authors of individual articles in this special section. (16 references) (CLB)

Summarizes and illustrates the knowledge-based approach to instructional material design. A series of sports coaching handbooks and hypermedia presentations of the same material are described and the different instantiations of the knowledge and training structures are compared. Figures show knowledge structures for badminton and the architecture…