More than 500.000 Somali refugees live in Kenya. This group is especially burdened by high rates of exposure to traumatic events, high prevalence of PTSD and a high comorbidity with substance use disorders, mainly related to khat (catha edulis). There's a shortage of literature on psychotherapeutic methods that are applicable in this group. The aim of this case series is to develop modifications of standard therapeutic techniques to the Somali culture and to the needs of this group. Twenty successive cases will be recruited from a community clinic where refugees often seek for treatment because of psychiatric problems. Senior level psychotherapists will apply and adapt techniques and approaches like Community Reinforcement Approach (CRA), Relapse Prevention (RP), and Narrative Exposure Therapy (NET); all sessions will be video recorded. Regular supervision with external experts and group discussions will be held to evaluate and adapt the single procedures and techniques. The aim of this study is the development of a standardized approach that can be used in a Randomized Controlled Trial which will be conduced in the future.