Past media research has tried to show that the medium itself made a difference in instruction and learning outcomes. However there are media attributes that must be considered in instructional design in conjunction with an analysis of the instructional goal. For example, the task requirements, type and level of learner-medium interaction, type and level of media adaptation required, and characteristics of the medium are all factors affecting the design of instruction. Research on the locus of control in learning may also be useful, particularly as it affects student achievement. Although prior studies yield mixed results on increases in student achievement based on locus of control, research has identified student aptitude, degree of inquiry, and prior knowledge as individual differences that affect the use of learner control. Interactive video combines computer assisted instruction with characteristics of video to provide an integrated educational environment that can be manipulated by the learner. However, the potential of this medium will only be realized through the design of quality instructional programs and effective implementation. (22 references) (DB)