This manual draws on recent advances in public policy science as well as the decades to long experience of UNEP and other organisations in the field of sustainability to motivated policy assessment. By using a ""building blocks"" concept, it builds on the approach proposed in the UNEP guidance manual Integrated Assessment: Mainstreaming Sustainability into Policymaking. It suggests using sustainable development as a major filter for prioritizing competing issues and for deciding on policy choices. The manual is expected to prove useful to policymakers and analysts, and will motivate its audience-adopt an integrated approach to policymaking and to play a role in a more intelligent management of human, financial and natural capital as a step towards achieving the Green Economy of the 21st century.