These two volumes contain the papers presented at the 6th International Conference on Probabilistic Safety Assessment and Management (PSAM 6). probabilistic risk and safety assessment and management methods and techniques applied to complex systems. These proceedings provide a collection of technical summaries on the application of risk and safety assessment management in 18 different technical disciplines. terrorism; risk assessment for aerospace systems; environmental issues in developing countries; risk assessment in transportation systems; sustainable development; and risk assessment in science and technology initiatives. It brought together world-recognized experts to discuss these topics along with emerging areas of direct relevance to practitioners of risk and safety assessment.