Topic accessed video is a prototyping system intended to allow authors to judge the educational effectiveness of various mixes of linear and
non-linear video elements. The topic hierarchy used by the student to control the video can be made to correspond to the
structure of printed study units. Video fragments lower in the topic hierarchy (modular movies) have a different, and
usually more complex, 'voice-over' to make up for the loss of contextual information provided by the continuity editing
in linear film.
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