International migration is a central aspect of globalization in the contemporary world. The fourth edition of this leading text has been extensively revised to provide an up-to-date and comprehensive assessment of the nature, extent and dimensions of international population movements and of their consequences. Two entirely new chapters in this edition assess the impact of migration on economic and social development and its implications for security. Also new to this edition is a companion website including: * Case studies * Web links * Updates * A web-only chapter It can be accessed at: www.age-of-migration.com