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…

A review of the concept of complex instructional treatments demonstrates that componential analysis is needed to properly identify the effective elements of an instructional system. Research should focus on both the system and the effectiveness of its parts. Research on teaching also requires that the complex interaction of the teacher's behavior…