To address the challenges faced by developing countries in the implementation of multilateral environmental agreements (MEAs), UN Environment joined forces with the European Commission and the Secretariat of the African, Caribbean and Pacific (ACP) Group of States and initiated a four year project in 2009 to assist 79 countries to enhance their capacities in implementing certain MEAs at the national and regional level. It is hoped that this publication not only illustrates some of the success stories and lessons learnt during the first phase but can also serve as a critical resource for policy makers, development practitioners and those involved in capacity building in the environmental field.