A study involving 169 graduate nursing students (4 males and 165 females) was conducted to assess the construct validity of the Adult Career Concerns Inventory (ACCI). The ACCI is designed to assess career concerns of adults of any age and occupation. Focused on the "planfulness" and exploration factors of the theoretical model of vocational maturity developed by D. E. Super et al. (1988), the 65-item Likert scale instrument assesses respondents' career exploration, establishment, maintenance, disengagement, and change. Respondents to the mailed questionnaire included 102 female and two male students, aged 23 to 62 years. Factor loadings were developed for ACCI items using principal axis factoring and both varimax and oblique rotations were applied to the initial factor matrix. This study provides an example of rationally defined scales giving more interpretable information than statistically defined scales. Two data tables are included. (TJH)