The 12 Lessons series pulls together knowledge on good practice in development co-operation from the OECD Development Assistance Committee (DAC), drawing in particular on the findings of the DAC peer reviews. These lessons can help DAC members and other development actors to understand and implement measures that are critical to managing and delivering development co-operation more effectively. This publication also draws on the body of knowledge collected by the OECD’s Network of DAC Development Communicators (DevCom), notably its publication Good Practices in Development Communication (OECD, 2014).