Some of the techniques of item response pattern analysis, profile pattern analysis, and configural scoring which are major. aspects of pattern analysis were described respectively and their characteristics were examined. Subsequently, the applications of those techniques to clinical psychology, personality measurement and other areas of psychology were reviewed. The effect of pattern analysis in diagnosis, classification and prediction was compared with that of the traditional additive technique and yet a definite result from the comparison has not been found so far. I think, however, that the effect of pattern analysis will increase by an adequate selection of subjects and techniques of analysis, a control of other factors that influence patterns, and a use of reliable and valid tests.