Expert systems should find widespread application in human factors, provided the problem of building expert systems (knowledge engineering) is dealt with satisfactorily. The task of knowledge engineering is outlined and five key strategic issues are identified. These strategic issues are discussed from a human factors perspective, and it is shown how current knowledge engineering methods can be extended to include the concerns of human factors. The potential contribution of human factors to knowledge engineering methodology is illustrated with two examples. The first shows how ranking techniques can be adapted to meet the requirements of knowledge elicitation; the second shows how protocol analysis can be used to validate expertise.
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