This participants’ guide is part of a five-part Caregiver skills training for families of children with developmental delays or disabilities (CST) package providing guidance on caregiver skills training for families of children aged 2–9 years with developmental delays or disabilities. This participants’ guide is meant to be used by caregivers who are participating in WHO’s caregiver skills training. The guide provides content that will be used during each of the caregiver skills training core group sessions (sessions 1–9). It includes illustrated descriptions of the key messages and tips (skills and strategies) taught in each session as well as goal-setting activities.