[A complex approach to modeling the functional status of a human operator based on the theory of fuzzy sets].

At present the man-operator acting as part of an automatic system experiences ever increasing physical and emotional stresses which makes it highly important to know how to measure reliably his functional state (FS). It is generally recognized that the FS is of systemic nature but the system concept has not been adequately investigated by experiment. The FS evaluation is usually reduced to one of the FS levels. The FS concept is replaced with the concept of the state of bodily functions. It is claimed that the FS can be better explored and estimated with the aid of mathematical models which represent it as a complex psychological event produced by interactions of all psychophysiological systems, operator's activities and his attitudes to them. This paper discusses an FS model which describes the FS from the systemic point of view and helps an investigator to test his hypotheses and heuristics. The model is hierarchic. Its first level is determined by models of such elements of the man-machine system as activities, psycho-physiological transformations, psychological transformations, object of monitoring and control, information system. Such models can be used to evaluate and predict the quality of the function of the above elements in relation to their inherent tasks. The second level of the FS model is associated with its complex evaluation as a systemic formation based on potential interactions (links) between elements.