A study in man-machine interaction

Authors:
Lawrence H. Miller
Affiliations:
University of Southern California, Marina del Rey, California
Venue:
AFIPS '77 Proceedings of the June 13-16, 1977, national computer conference
Year:
1977

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Abstract

The performance of users in man-machine interaction (MMI) is described in terms of a number of user- and machine-oriented parameters. The general linear model for experimental design is used as a model of the interaction. Performance measures are selected and a questionnaire developed to gauge user attitudes toward the man-machine system (MMS) and its environment. The interface parameters selected are hypothesized to have a significant effect on the performance and attitude measures. The effects of varying CRT display rates and output delays upon user performance and attitudes in a series of message retrieval tasks were evaluated experimentally. The results support the somewhat surprising conclusion that doubling the display rate from 1200 to 2400 baud produces no significant performance or attitude changes; increasing the variability of the output display rate produces both significantly decreased user performance and a poorer attitude towards system and interactive environment. The generally held notion that increasing output display rates is associated with better user performance is not supported.