The themes of migration and economic development are traditionally related. The debate on these issues has recently gained much relevance, particularly in Europe, as the phenomenon of migration tends to be seen as a possible consequence (and cause) of political and environmental unrest. This volume is a contribution to the move towards migration policies which increase total welfare, both in the host countries and in the countries of origin. It also explains problems specific to Europe and stresses the need for co-ordinated national policies.