Social class and ethnic group differences in college students' career maturity were investigated. Participants were 401 undergraduates (250 females, 151 males) attending California State Univesity, Long Beach. Quantitative measurements included: (1) the Duncan Index of social class; (2) Career Maturity Inventory-Attitude Scale; (3) the Vocational Preference Inventory and coding of a subject's career aspiration to determine vocational congruence; (4) the Career Development Inventory's University and College Form (to measure career decision-making ability); and (5) grade point average (GPA). One-third (n=128) of the sample participated in the survey and interview phases; the other two-thirds participated only in the survey. Quantitative analyses did not reveal significant social class differences in career maturity. Various ethnic group differences were observed in regard to career mature attitudes, vocational congruence, and GPA. In terms of career mature attitudes, Caucasian-Americans exhibited significantly greater career maturity than did Filipino and Asian-American students. Filipino students reported a significantly lower mean vocational congruence than all other ethnic groups. Findings suggested that current theories of career development and career counseling were lacking in their application to today's ethnically diverse college population. (33 references) (YLB)