ROGELIO ALONSO is Professor of Political Science, University of King Juan Carlos and Coordinator of the Terrorism Analysis and Documentation Unit, Madrid, Spain BEATRICE A. DE GRAAF is Assistant Professor/Research Coordinator at the Centre for Terrorism and Counterterrorism, The Hague campus of Leiden University, The Netherlands BOB G.J. DE GRAAFF is Professor of Terrorism and Counterterrorism at Leiden University, The Netherlands IAN LEIGH is Professor of Law at the University of Durham, UK CHRISTOPHER MICHAELSON is a Human Rights Officer (Anti-Terrorism) at the Office for Democratic Institutions and Human Rights (ODIHR) of the Organization for Security and Cooperation in Europe (OSCE), Austria CHRISTOPHER J. NEWMAN is Lecturer in Law at the University of Sunderland, UK PHILIP N. S. RUMNEY is Reader in the Law School at the University of the West of England, UK PETER A. SPROAT is Senior Lecturer in Fraud Management at the Centre for Fraud Management Studies, University of Teesside, UK CLIVE WALKER is Professor of Criminal Justice Studies at the School of Law, University of Leeds, UK