“…Viewing learning as one of the ways in which the individual interacts with his environment, psychologists recognized how much more thoroly they had to study the individual in order to understand how he learns and what he learns, and they intensified, too, their investigation of the environmental factors that influenced learning. The curve of learning was no longer an adequate way of evaluating the course of learning; and new technics, designs, and instruments were developed for the more thoro study of the learning process (8,19,42,71,92).…”