The Efficacy of Treatments to Improve Self-esteem

The goal of this study is to examine the effectivity of two self-esteem interventions (COMET (Korrelboom) and CBT (De Neef)) in a general psychiatric population. The main questions it aims to answer are: * is there a difference between the two interventions in effectiveness on increasing self-esteem? * is there a difference between the two interventions in effect on levels of anxiety, depression and general mental health? * are found effects on levels of anxiety, depression and general mental health associated with changes in self-esteem? * is the ability to use imagination a moderator for outcomes in both conditions? Participants are randomised over both conditions. At baseline (T0), end of treatment (T1) and follow-up at 6 months (T2) several outcome measures are conducted, such as RSES, DASS and MHC-SF.