Abstract

This paper briefly reviews the problems of defining and measuring the of aircraft pilots and other human operators of complex dynamic systems. Of the alternative approaches the author indicates a clear preference for the use of subjective scaling. Some recent experiments from MIT and elsewhere are described Which utilize subjective mental workload scales in conjunction with human decision and control tasks in the laboratory. Finally a new three-dimensional mental Workload rating scale, under current development for use by IFR aircraft pilots, is presented.

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