Part I 1 Perceptual and Verbal Training and the Acquisition of Diagonality

If our analysis of the developmental changes that occur in the mind of the child are approximately correct, we should now be in a position to specify more precisely what happens due to the impact of instruction. The analysis should in fact specify the specific components of the instructional process. It should be noted that at this point we are treating instruction as simply the reciprocal of development; In Part II we shall examine the psychological nature of instruction more critically.