Provides a summary of a series of research and development projects which investigated the reasons for failure in educational technology-based systems of instruction. Develops a new approach to the design of such systems and their subsequent implementation and control. A 17-item bibliography is included. (Author/CHC)

Discusses two ways in which task analysis can be integrated with instructional design--substantive integration, where the type of task analysis is determined by design type, and temporal integration, where analysis activities are interspersed with design activities. Flowcharts, examples of and procedures for instructional analysis, and references…

Various models that have been devised to evaluate the performance of information retrieval systems are reviewed. Such models fall into three categories: (1) evaluation from the viewpoint of the user, who is primarily concerned with how well the system responds to his query; (2) evaluation from the system operator's standpoint, which focuses on the…