1. Purpose This study has two main objectives: The first is to provide some clinical data to justify Dr. Wechsler's idea of general intelligence the behavior theory and to prove Dr. Alexander's idea of X and Z factors the temperamental and personality factors theory. The second objective is to provide my own idea the life history theory. 2. Method After I finished the Japanese standardization of WISC in 1953, I started clinical case study of children and analyzed more than a thousand cases. 3. Results What I have found is as follows: By measuring children's intelligence with WISC, we not only can find personality factors, but also can diagnose children's life histories how children are brought up and what their parents' attitudes are like. and so on. I have listed ten illustrative cases showing brief case histories and Verbal I.Q., Performance I.Q., Total I. Q., and Scaled-Score profiles.