The four scales of the Myers-Briggs Type Indicator, Extraversion-Introversion, Sensation-Intuition, Thinking-Feeling, and Judging-Perceiving, were intercorrelated with a battery of 32 tests, including 15 ability tests, 7 experimental interest tests and 10 scales taken from the Personality Research Inventory. Subjects were male and female high school students in Massachusetts. Factor analyses for males and females separately showed that the Indicator scales as a set are linked with ability, interest and personality variables. Comparison of the analyses revealed some sex differences, and interpretation of the results indicated that all four scales reflect surface characteristics other than the typological differences for which they were constructed.