Abstract
Abstract The analysis of man-machine systems aimed at first at the optimization of displays and controls to create better working conditions. The general approach was then machine-centred. Gradually it appeared necessary to reverse this attitude into a man-centred approach. Instead of analysing man as an operator it seems now indispensable to study the operator as a man which implies an anthropological approach. The structure of the operator's activities has to be examined. In this connexion it is important to lake into account his vision of the situation resulting from the implementation of his work. The operator has to be considered as a whole, as a complete system receiving information not only from the object he is working at but also through different channels connecting him with the environment as well as from signals coming from himself. Sometimes these non-instrumental signals achieve a greater importance than the instrumental ones. However, the drafting of a comprehensive psychological theory of ...
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