Chapter 1, ‘The Security of Energy Supply and the Contribution of Nuclear Energy - Concepts and Issues”, was written by Dr. Jan Horst Keppler integrating material provided by the Expert Group and, in particular, by Professor William D’haeseleer. Chapter 2, “Indicators and Models for Measuring Security of Energy Supply Risks”, was written by external contributors, Mr. Jaap Jansen and Mr. Adriaan van der Welle of the Energy Research Centre of the Netherlands (ECN), integrating material provided by the Expert Group and, in particular, by Dr. Henk Weis and Dr. Koji Nagano. Chapter 3, “Evolution of the Security of Energy Supply in OECD Countries”, was written by Dr. Alexey Lokhov. Chapter 4, “Public Attitudes towards Nuclear Energy and Security of Energy Supply” was written by Ms. Lucie Liversain, based on material provided by the Expert Group and a group of students from the Institut d’etudes politiques (IEP), Paris, co-ordinated by Ms. Alena Pukhova.