In this paper, manual control systems are classified into three control forms; i) sequentical control, ii) continuous tracking control and iii) control in the system in which state variables are limited, and the learning process of human operators in each control system analyzed. From these results some suggestions are obtained for the reduction of learning or training time. Especially in the third case, it is found that a human operator can almost perform optimal operations, that and it is possible to reduce the time necessary to obtain proficiency in the control, if he is informed of the optimal operation pattern beforehand.
