An Investigation of the Effects of Output Variability and Output Bandwidth on User Performance in an Interactive Computer System.

摘要

The performance of users in man-machine interaction (MMI) is described in terms of a number of user- and machine-oriented parameters. 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 questionnaire, which elicited user's attitudes toward the system, correlates with performance on the interactive tasks. The importance of these results to designers of MMS is discussed.