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It an be argued that one of the chief impediments to progrfi in human cn5in¢= l ‘3flS 35 ‘Mf ‘m ‘M “f ‘M human infonnation-procssor posed in sudi a way as to enable approirunate engineering ailculauons to l_> e_rnade of human perfonnaiicc. The Model Human Procaor is an attempt at such a inndeL The use of the model is rlll-IS!-tflwi through sample computations.

Anyone who has had the task of trying to obtain from the literature psychological guidance for the design of an interactive computer system is aware of the great frustrations engendered by the jumble of empirical results and micro-theories. tightly bound to experimental paradigms. which he finds. It is not that psychology has no information to offer. Indeed. there has come to be established. especially in cognitive psychology, a robust set of verified facts about the working of the human mind. But these facts are difficult to retrieve and to apply in new …