Migration has been a key feature of several far-reaching political events that have shaken the western world in recent years. How western countries handle issues of how to regulate immigration appears critical for their future development. Many agree on this, but at the same time think they know too little about these issues. This book has been written for those who want to find out more about why people migrate and what the consequences are of their doing so. It looks at what motives drive people to migrate and at migrants' economic outcomes in their destination countries. It describes the state of knowledge about the economic and social consequences of migration for the communities that receive the migrants. And it discusses what scope there is in the west for increasing the level of control over migration.