Abstract
A brief review of the effectiveness of instructional media is presented, with reference to mastery learning and the effects of illustrations. This is related to the need for instructional media to incorporate both of these essential elements if they are to succeed in enhancing the level of student performance. The role of computer technology, and in particular the authoring system HyperCard, in achieving this is discussed. An experimental program, HyperHeart, is used to illustrate the potential of such a system in biology.
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