This online course will introduce the Acute Stress Syndrome Stabilization (ASSYST) treatment procedures in the context of fieldwork with refugees and asylum seekers on three continents: Africa, Latin America, and Europe. The course will briefly explain the Adaptive Information Processing (AIP) theoretical model and the theoretical foundation of the ASSYST treatment intervention procedures. Different symptoms and real-life experiences of the refugee and asylum-seeking population will be discussed. The ASSYST treatment interventions and their objectives, in their group and individual format, will be introduced, and how the fieldwork team members at EMDR Mexico apply the ASSYST treatment intervention procedures within a symptom-based trajectory stepped care approach with refugees and asylum-seekers.