Aim of the current study is to investigate the acceptance and efficacy of D-MCT in outpatients.The Hamilton Depression Rating Scale (HDRS, 17-item version) total score as well as the Quick Inventory of Depressive Symptomatology (QIDS) serve as primary outcome. Self-assessed depression, dysfunctional beliefs, self-esteem, quality of life, rumination, remission rate as well as neuropsychological functioning serve as secondary outcomes.