The objective of the study is to obtain knowledge about the treatment of patients who are offered intensive trauma treatment at Nydalen DPS (NDPS) and Søndre Oslo DPS (SODPS). The treatment takes place on an outpatient basis over two weeks. Up to 42 patients will be recruited. The efficacy of treatment will be investigated using validated self-report forms, which measure PTSD symptoms (PCL-5 and ITQ) and quality of life/function (WHO-5, and WSAS). The measurements will be done before the treatment and one and twelve weeks after treatment.In-depth interviews will also be conducted with up to 30 patients to investigate the outcome and any need for adjustments with focus on patients with minority backgrounds, men and patients with limited benefit. The study uses a mixed methods design, where quantitative measures and information from qualitative interviews are combined to map participants' experience, benefits and feasibility.