Abstract
In this paper, the rating method using a CRT display and a micro-computer is reduce or diminish the rating errors. On the CRT display, two growing lines are displayed and the growing speeds of lines are controlled by the analyst using the micro-computer. One growing speed is controlled to show "the normal performance" and the other to show "the performance of operator." So, by this method he can observe two performances as growing lines, and the process to quantitatively evaluate the performance of operator is doen with the micro-computer. The errors using this method are studied on the models and experiments.