In this treatment study, 120 patients were randomly assigned to either the ASSIP intervention or a control group that received a one-session clinical assessment. Both groups received in- and outpatient treatment as usual. The quality of the therapeutic alliance as a moderating factor for outcome was measured at the therapy sessions 1 (both groups) and 3 (ASSIP group only) using the Helping Alliance Questionnaire (HAq). Regarding outcome measures the study participants completed a set of psychosocial and clinical questionnaires every 6 months during a 24-months follow-up period.