An attempt was made to delineate personality types by applying a Q-type factor analytic strategy to the California Psychological Inventory protocols of several samples of subjects. Three modal profiles, characteristic of the scores of major subgroups of individuals, were isolated and subsequently cross-validated. These three major types-tentatively labeled as antisocial, neurotic, and well adjusted-classified 57% of the subjects in the study. Differences in the distribution of these types as a function of race and sex were described. The use of these types in the interpretation of individual profiles was outlined, and applications of the types to research studies were suggested.Attempts to delineate personality types have been some of the earliest and most pervasive endeavors in psychology (Jung, 1939;Kretschmer, 1925;Sheldon, 1942). Certainly, the notion of reducing the almost infinite variation among individuals to a more limited number of personality patterns is appealing and potentially highly utilitarian, and a number of such attempts (e.g., Holland, 1973;Morris, 1956;Meyers, 1962) have shown some usefulness. Further, code type approaches with the Minnesota Multiphasic Personality Inventory (MMPI) have facilitated clinical interpretation of that test (e.g., Gilberstadt & Duker, 1965;Gynther, Altman, & Sletten, 1973;Marks & Seeman, 1963). Such procedures involve developing rules for determining whether an individual MMPI protocol is similar to a particular type (denned by certain characteristics of the score profile) and a description of the characteristics and correlates associated with that type. These may, in principle, be empirical correlates or correlatesThe authors are indebted to Harrison Gough and Lewis Sherman for their help in interpreting the CPI types and for comments and suggestions concerning the present article.Requests for reprints should be sent to