Abstract
This paper describes the use of a modified cassette recorder to present information and instruction to intermediaries and users of on‐line information retrieval systems using three media. The cassette recorder co‐ordinates (1) computer signals recorded from and displayed upon a visual display unit, (2) audio‐signals, that is voice commentary, relayed through a loud speaker, and (3) thirty‐five millimetre slides displayed on an overhead screen. The system was designed and developed for use in the Central Information Services, London University.

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