We tested the social-cognitive model of career self-management (Lent & Brown, 2013) using a longitudinal design. Participants were 420 college students who completed measures of career exploration and decision-making self-efficacy, outcome expectations, social support, goals, and actions, along with trait conscientiousness, at 2 time points roughly 4 months apart, near the beginning and middle of an academic year. They also reported their level of career decidedness and decisional anxiety at both of these time points as well as near the end of the academic year (about 3 months after the 2nd assessment). The model provided good overall fit to the data and accounted for substantial portions of the variance in engagement in exploratory actions and in the 2 decisional outcomes (decidedness and decisional anxiety) over time. The findings also supported the hypothesized bidirectional paths of the decisional outcomes to self-efficacy and outcome expectations. We consider implications of the findings for the social-cognitive model as well as for future research and practice. Public Significance Statement We tested a theoretical model of career decision-making in college students. The findings suggest that particular elements of the model, such as confidence in career decision-making skills, predict favorable change in students' decisional status and anxiety over time.