HÉLÈNE COMBES is CNRS Research Fellow with the Centre de recherches politiques de la Sorbonne, Paris 1 University, FranceDONATELLA DELLA PORTA is Professor of Sociology in the Department of Political and Social Sciences at the European University Institute, ItalyMARCO GIUGNI is Researcher at the Laboratoire de recherches sociales et politiques appliquées (resop) and teaches in the Department of Political Science at the University of Geneva, SwitzerlandNICOLAS HAERINGER is a doctoral researcher at the CERSO (Centre d'étude et de recherche en sociologie des organisations), Université Paris-Dauphine, FranceRAFFAELE MARCHETTI is Lecturer on International Relations at LUISS University and John Cabot University, ItalyLORENZO MOSCA is a Postdoctoral Fellow at the European University Institute and is currently a research fellow at the Bocconi University (Milan), ItalyALESSANDRO NAI works as a teaching and research assistant in Political Science at the University of Geneva, SwitzerlandMARIO PIANTA is Professor of Economic Policy at the University of Urbino, ItalyHERBERT REITER is Researcher at the European University Institute, Florence, Italy DIETER RUCHT is Professor of Sociology and co-director of the research group 'Civil Society, Citizenship and Political Mobilization in Europe' at the Social Science Research Center, Berlin, GermanyCLARE SAUNDERS is Lecturer and RCUK Fellow in Politics and International Relations at the University of Southampton,UKISABELLE SOMMIER is Professor at the Sorbonne, Paris, FranceSIMON TEUNE works at the Social Science Research Center, Berlin, GermanyDUCCIO ZOLA is currently a PhD student in philosophy at the University of Rome 'La Sapienza', Italy