Compares two types of facilities for development and revision of videodisc materials: a film-based premastery system and a video-based system. The first has advantages of lower initial costs, while the second is better for quality, time, and recurring cost savings. (Author/JEG)

A potentially powerful instructional delivery system, "intelligent videodisc" may fit CAI to the institutional structure of education for the first time. However, it will probably face traditional barriers, including teacher unwillingness and tight budgets. (JEG)

This field study examined learning effects attributable to instructional design characteristics when eighth-grade science students used a print encyclopedia or a videotex version of the encyclopedia to write term papers. Results suggest that specific effects of instructional design characteristics of a delivery system are of a limited nature. (MBR)