Based upon important socio-legal research supported by the European Commission and the Nuffield Foundation, this book examines the impact of migration on children within the European Union. Set within the framework of the development of "Citizenship of the Union" and the extension of legal rights to the families of Community migrant workers, the research involves in-depth interviews with parents and children of EU migrant families in Sweden, Portugal, Greece and the UK. Examining their formal legal entitlement under Community law, it assesses the relevance of European citizenship to children and charts recent developments in EU policy-making and the promotion of children's rights. The authors describe the experiences of the children with a focus on patterns of migration, the involvement of children in migration decision-making, and the impact of moving on their life chances in the receiving countries. In addition, the book describes and evaluates an innovative approach to the development of interdisciplinary and child-centred methods in comparative research.