On the basis of a careful study of the Soviet and foreign literature, informativeness of physiological, biochemical, psychometric, biomechanical methods used to measure pilot performance inflight is evaluated. It is suggested that such performance can be assessed via a systemic approach and with the aid of the following parameters: functional state as indicated by physiological and biochemical recordings; subjective evaluations of the state using the psychometric scale; quality of the flight task performed; precision of piloting; and structure of controlling movements. This complex of parameters can be used only after landing. Inflight evaluation of pilot performance still remains an unresolved problem. The greatest promise holds search for objective criteria of automatic evaluation of the quality of pilot performance, structure of controlling movements, and physiological parameters on an integral time scale.