Participants. Inclusion/Exclusion Criteria. Participants will be included in the study if they: (a) are 18 years or older; (b) agree to the informed consent, (c) have sufficient knowledge of German; and (d) fulfill the diagnostic criteria of GAD DSM-IV criteria. Participants will be excluded if they have: (a) a score of 2 or higher on the suicide item of the BDI and/or with active suicidal plans according to the diagnostic screening interview, (b) a current medication of psychotic or bipolar disorder, (c) a current treatment by a professional psychotherapist. Further, prescribed medications for anxiety or depressive disorders do not lead to exclusion if the dosage has remained constant for at least one month. The presence of a comorbidity does not result in exclusion if GAD is in the foreground according to the severity rating of the Diagnostic Interview for DSM-diagnoses.