Relational Evidence in Preventive Child Protection: Evaluation of a Manual Based Group Intervention "Strengthening Resources of Mentally Ill and Addicted Parents" This article describes results of the evaluation of the manual-based group intervention programme "Strengthening Resources of mentally ill and addicted Parents". This intervention's objective is to encourage parents in mentalization, emotional regulation, coping with stress and social support competencies. Strengthening these reflexive competencies aims at promoting parents' recourses and minimizing risks for child abuse. Therefore, the evaluation design is based on data triangulation: combining standardised instruments and qualitative interviews of participants and professional providers. Besides intervention effects, this design aims to analyse aspects by parents' and professionals' subjective perspectives, which promote the interventions in it's effect. 160 parents participated. The results show, that parents feel statistical significant less overwhelmed by the responsibility of being a parent, recognise more capacity to act and support in everyday. Qualitative data analysis reinforces these results and shows how the manual's concept supports parents' benefit from the intervention in their every day life.