This paper describes a project conducted to evaluate the mental representations of the three people involved with a real life supervisory control system i.e., operators, experts and designers. Each personas mental model of the supervisory system was derived from the “commented drawing” technique, i.e., the drawing and the explanation given when the subject was asked about the system's functioning and operation. The comparison of the drawings could provide an idea whether subjects have different concepts about the functioning and operation of the same system. It is clear that experts engineers and operators have different ideas about the functioning and operation of the same system.
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