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DESPITE the fact that Jung presented his theory of psychological types nearly half a century ago (Jung, 1921), American psychology has continued to classify individual differences in personality, almost exclusively, according to psychological theories based upon a normal distribution of personality traits from none to much. This is in contrast to Jung's concept of a pair of opposing attitudes: introversion and extraversion; a pair of opposing perception functions: sensation and intuition; and a pair of opposing judgement functions: thinking and feeling. With the recent appearance of reports of research In which subjects are described or selected in terms of these classifications, the desirability of evaluating available tests of psychological types is apparent. This study was undertaken to evaluate two such tests: the Gray-Wheelwright Questionnaire (Gray and Wheelwright, 1946) and the Myers-Briggs Type Indicator (Saunders, 1958). Each of these tests was to be compared with an outside criterion. The criterion selected was the self-typing of Jungian analysts.
Twenty-eight practising analysts, members of the two Jungian analytical societies in California, participated in this study. The group consisted of 17 males and n females between the ages of 34 and 70 years (median chronological age: 50·0 years), either licensed physicians or certified psychologists. The subjects were asked, before taking either test, to indicate the type to which they thought they belonged in terms of introversion versus extra-version, sensation versus intuition, and thinking versus feeling. After so