The generalizability of our findings is limited by the non-random assignment because the student self-enrolled in the course. It might be that students self-selected into the course because of their interest in creativity and thus the results might not be generalizable to all students. However, in the course announcement only limited reference was made to creativity. In contrast, the announcement stressed problem solutions and actions. Thus, a self- selection of students interested in creativity seems unlikely. The validity of our findings might be threatened by a lack of a control group, but the use of a non-equivalent dependent variable design, and the results concerning this variable mitigate this concern. Nevertheless, in future evaluation studies, a comparison to alternative elective courses would shed light on the question how to further improve the course design. A larger sample would be needed to test possible boundary conditions, for example, group processes or the degree to which individuals made critical experiences during the course. Furthermore, long-term effects of the training need to be assessed. It is an open question if creative self-efficacy will be enhanced over the long run and lead to creative outcomes inside and outside training. Taken together, more research is needed on the effect of training of creative self-efficacy.