This study investigated the effects of sex, status of occupational choice, and career development responsibility on the career maturity of ninth-grade students from an urban, industrial, integrated community. The instruments used were the Career Maturity Inventory (Crites), and the Career Development Responsibility (CDR) scale (Thomas). Results showed that the main effects of occupational choice and levels of the CDR scale were significant. Students who were able to state an occupational choice had more mature career attitudes than those who were undecided. Although the main effect of sex was nonsignificant, the interaction between sex and CDR levels approached significance suggesting that sex and level of career development responsibility may have differential effects on the development of mature career attitudes. (Author/EK)