This paper examines the role of migration in economic, social and political development in Africa, the Caribbean and Pacific (ACP). Following the inclusion of a migration clause (article 13) in the political dimensions chapter of the Cotonou Agreement, migration issues have come onto the EU's development agenda. However, there has been debate as to whether migration is a "development issue" and if it should be addressed through development cooperation. This paper argues that migration is an important aspect of economic and social development and needs to be addressed as a development issue and needs to be addressed from an ACP as well as an EU standpoint. The paper shows there are a wide range of measures that could be taken to address migration using development instruments, but there is a need for a change in emphasis, or at least scope, in the way the EU is incorporating migration issues into development. Key policy challenges which are highlighted throughout the chapter, deal with different dimensions of migration. Issues covered include the causes and effects of migration in ACP states; brain drain; return migration; labour mobility and GATS; lower skilled migration; regional migration flows (intra-ACP migration); forced migration and internal displacement; and trafficking. The role of policies in critical sectors such as health and education in addressing some of the major challenges posed by migration is raised, showing that migration issues affect other areas of development cooperation, and remittances are also discussed.