chapter 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 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 evolution of the security of energy supply in oecd countries was written by dr alexey lokhov chapter 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 coordinated by ms alena pukhova