This document provides guidance on strategic communication approaches for behaviour and social change in South Asia. It discusses how communication can be used for advocacy, social mobilization, and behaviour development. Specific case studies from countries in the region are presented to illustrate lessons learned from communication campaigns in public health, immunization, and orphan support. Monitoring and evaluation methods are also reviewed to measure the impact of communication interventions on behavioural and social outcomes. The document aims to help UNICEF staff and partners improve programming through strategic, evidence-based communication planning.