The title of this thesis is “Trauma-sensitive social work. Important skills in supporting traumatized clients”. First of all an overview of the relevance of the topic and the theoretical knowledge of psychotraumatology is given. Based on this, trauma-sensitive values, attitudes and concepts are discussed and possible courses of action and interventions identified. Furthermore the thesis deals with the positioning and the cooperation of trauma-sensitive social work and psychotherapy. Since working with traumatized clients also carries a certain amount of risk, the secondary trauma and the necessary self-care will be illustrated finally. The thesis aims to support the establishment of trauma-sensitive social work.