Evidence-based treatments for depression include pharmacological and psychological interventions. Within psychological interventions, cognitive behavioral therapy (CBT) is one of the most extensively researched evidence-based approaches for depression (Cuijpers, 2015). However, even if optimal treatment and access to services were available to all patients, the burden of depression would be reduced by only 30% (Andrews et al., 2004). Moreover, as depression represents the disorder with the highest drop-out rates during CBT treatment (36.4%) (Fernandez et al., 2015), and a relapse rate of 54% for treatment responders within the two years after treatment termination (Vittengl et al., 2007), it is pivotal to improve treatment for depression. It has been argued that this is less a question of developing novel psychological treatments as of determining how existing treatments may be improved (Cuijpers, 2015) and better disseminated to increase retention rates and to use the waiting phase to rise interest in therapy (Fernandez et al., 2015). Due to hopelessness and the discouraging character of the disorder, this poses a particular challenge.