Large-scale use of talking computers may be anticipated for reasons of general convenience and special effectiveness. A telephone link to a computer, with touch-tone inputs and stored speech outputs, poses a number of design problems of interest for the human factors specialist. Recommended features include (1) user pacing and optional repetition of speech output in a transactional sequence, (2) use of different voices and other auditory coding to distinguish types of output, and (3) use of tone codes to indicate required input.
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