The provision of workplace-based experiences (internships) is an important component of the training program for students attending vocational education courses. The purpose of this study was to clarify the relationship between internship quality and students vocational development, considering students' vocational profiles, in a sample of 346 twelfth grade students from southern Portugal, using a longitudinal design. Results show that internship quality is associated with the career development of students, mainly concerning the process of career exploration, and has an effect that appears to be more pronounced for some of the clusters. Implications for career intervention are discussed.