As part of the Mental Health Gap Action Programme, WHO has developed training manuals (Training of trainers and supervisors training manual and Training of health-care providers training manual) to support implementation of the mhGAP Intervention Guide for mental, neurological and substance use (MNS) disorders in non-specialized health settings, version 2.0. These manuals can be used to build capacity among non-specialist health-care providers in the assessment and management of people with priority MNS conditions in low resource settings.