This is a popular account of C. G. Jung's theory of types and the application of the theory to problems of everyday life. The work represents a translation of Jung into American 'scientific slang'. The author seeks to translate Jung's ideas into the language of behaviorism and performance psychology. On the whole, she avoids very skilfully the confusions of concepts which are usual in such a book. However, it probably will not fulfil the publisher's promise that, 'From this interpretation of the Jung theory you can … achieve for yourself a complete, mature, and balanced personality'.