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Abstract
Computer technology has made a conversationally interactive system concept feasible, but the user-oriented disciplines have not yet abandoned the man v machine task allocation orientation in favour of man-with-a-computer concept of performing complex cognitive work. Guidelines for application of interactive computer systems depend on (1) a knowledge of the kinds of subtasks experienced decision makers perform when they do their jobs, and (2) the characteristics of their performance in each subtask.
Empirical research with experienced, professional decision makers is reviewed to define subtasks and to document performance characteristics. Implications of man's known performance characteristics are traced out to general recommendations for design of interactive systems.
