Migratory movements combined with new technologies and growing wealth have changed the face of Europe. One in ten Europeans today is foreign-born. Despite EU integration, policies and processes for incorporating these immigrants, and their children and grandchildren, have remained mainly in the national policy domain. They, moreover, vary widely from nation to nation, and often from city to city within nations. This third instalment of the IMISCOE Textbook series offers an authoritative overview of the state of scholarship on approaches to the study of immigrant incorporation, bringing current theory and practice together to analyse problems and debates in this growing field.