Christin Celebi, Barbara Krahé, Nadine Spörer

• A quasi-experimental study with N = 293 participants studying toward a teaching degree examined the efficacy of the intervention program "Strengthened for the teaching profession". In a pre-, intermediate- and post-test control group design, three treatment conditions that focused (1) on their individual professional strengths, (2) professional weaknesses, or (3) a combination of strengths and weaknesses were compared to a no-treatment control condition. Both at intermediate test and at posttest, students in the three intervention conditions scored higher than students in the control group on measures of self-efficacy and professional self-regulation. The combined intervention condition was more successful at promoting professional self-efficacy and self-regulation than the intervention focusing either on strengths or relative weaknesses only. The implications of the findings for teacher training are discussed.