This book examines differentiated integration in Europe, providing incisive analyses of domestic politics determinants - political conflict, party responses, citizens' preferences and other supply and demand side elements.The four countries compared - Germany, Poland, Switzerland and the United Kingdom - afford rich diversity and offer broad empirical material available for cross-country analyses. Featuring interdisciplinary research, this book draws together recent developments in the evolution of European integration differentiation - its dynamics and determinants.This monograph will be of key interest to scholars and students of European integration, comparative politics, political psychology, international relations, and more broadly to European (area) studies.