The report documents the process of scaling up comprehensive sexuality education and the status of sexuality education in East and Southern Africa. The aim of this document is to review lessons learned, identify key processes, provide a snapshot of the current situation, and document the course taken by 16 of the ESA Commitment countries to develop their current schoolbased CSE programme and its scale-up. Chapter 2 uses the lessons learned from the 16 countries to provide an overview of the nature and extent of processes required to scale up the provision of CSE in schools once the decision has been made to do so, while Chapter 3, the country case studies, documents the path each country followed in implementing a CSE scale-up. The conclusion recaps the key messages that emerged from this documentation and review process. The document is addressed not only to governments wishing to scale up the provision of CSE or see how other countries are doing it, but also to development stakeholders such as UN agencies and NGOs working in this field to improve collaboration and coordination and enable a more effective and complete scale-up at the national level.