Book excerpt: The mhGAP Intervention Guide (IG) is a clinical guide on mental neurological and substance use disorders for general health care workers who work in non-specialized health care settings particularly in low- and middle-income countries. These health care workers include general physicians family physicians nurses and clinical officers. The mhGAP programme provides a range of tools to support the work of health care providers as well as health policy makers and planners The proposed guide is an adaptation of the mhGAP Intervention Guide to be used in humanitarian settings. These settings include a broad range of acute and chronic emergency situations arising from armed conflicts natural disasters and industrial disasters and may include mass displacement of populations (eg refugees and/or internally displaced people).