We explored the ''idiothetic'' cognitive structure of RIASEC occupational percepts in a sample of Italian middle and high school students over a one year period, examining the possible bidirectional linkages between cognitive-vocational structure, involvement in career exploration activities, and exposure to authoritative parenting style. The focus was on the extent to which individuals' thinking deviates from the normative RIASEC circumplex structure. Results indicated that there was less stability in the occupational percepts of middle school students over time, but both student groups showed change in the direction of greater adherence to circular structure. In addition, deviation from the circular model was related to subsequent career exploration, and initial levels of career exploration and parental authoritativeness were predictive of later circular structure, especially in middle school students. The results support the importance of examining individual variation in cognitive-vocational structure in relation to career development models and interventions.