Application of signal detection theory to decision making in supervisory control The effect of the operator's experience

Abstract

Signal detection theory (SDT) was used as a model for a supervisory activity: the decisions of the air-traffic controller using radar. Of particular interest was “ the professional-experience” factor which was studied by comparing the performance of trainee and experienced controllers. Through a distinction allowed by SDT between information processing (d') and the decision process (β ), it was shown that trainees discriminate better than experienced controllers, but that the latter manifest a greater degree of caution. These results are interpreted in terms of different information processing methods (judgement versus calculation) and different evaluations of the costs of possible outcomes. The practical interest of these results is demonstrated both for the evaluation of an operator aiding computer system and for methods of training

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