Jungian measures have proven extremely popular, selling more than three million copies per year for use in various types of counseling. This study investigated the construct validity of scores from an alternative measure of Jungian personality, the Personal Preferences Self-Description Questionnaire (PPSDQ) (B. Thompson, 1996). Forms of the PPSDQ and the Myers-Briggs Type Indicator (I. Myers and M. McCaulley, 1985) were completed by 394 college students. A variety of first- and second-order factor structure models, as well as concurrent validity models, were evaluated using structural equation modeling (SEM). In addition, factor invariance across gender was also evaluated using SEM. The PPSDQ was found to measure four underlying constructs adequately, as hypothesized. Evidence was also found for a higher-order factor underlying these four dimensions. No gender modeling effects were found in this data set. In general, the PPSDQ yielded results comparable to those from the Myers-Briggs measure. (Contains 4 tables, 16 figures, and 45 references.) (SLD)