XCEPT Rapid review of evidence: Trauma, PTSD, and psychosocial support interventions in fragile and conflict-affected areas By Dr Alison Brettle, Dr Pauline Zerla, and Sam Hibbs The greatest challenge for policymakers and practitioners in any transition out of war is to build peace and trust in communities that have experienced prolonged or repeated violence, and to transform harmful relationships, attitudes, and behaviours forged during conflict, thus reducing the risk of a return to violence.