Interactive Research and Development on Teaching (IR&DT) is an alternative Research and Development (R&D) strategy that probes the questions, problems, and concerns of classroom teachers in a nonlinear manner. Each of the primary functions of traditional R&D--research, development, dissemination, and implementation--are performed…

The program of systematic evaluation of variables associated with visual learning was initiated in 1965 to investigate the impact of variables linked to effective, efficient use of instructional visual materials. A prototype experimental package, containing a specific unit of cognitive content, learner achievement objectives, four individual…

The purpose of the teacher-learner strategy (TLS) project is ostensibly to test different instructional arrangements in different national contexts to see which ones obtain the best results. The logic of this approach is compelling. Yet it is the orderly appearance of the TLS project that might be its greatest problem. The doctrine of external…