These developments pose a challenge for European social science scholars, both theoretically and based on practical experience from their research activities. International cooperation has improved theoretical and methodological knowledge in a major way, and academic exchange and migration have led to innovation in science and research. Since academic communities support further internationalization and Europeanization, and are opposed to all types of barriers between the nation states, there is a need to theoretically, conceptually, and empirically research the idea of a ‘European society’. This book was originally published as a special issue of Innovation: The European Journal of Social Science Research.