The analysis and management of risk and the mitigation of hazards is of fundamental importance to planners and researchers around the world. The papers featured in this book come from the fourth in the popular international conference series on this subject and cover areas such as: Estimation of Risk; Man-Made Risk; Seismic Hazard; External Events - Terrorism and Sabotage; Risk Perception and Philosophy; Landslides and Slope Movements; Data Collection Analysis; Emergency Response; Soil and Water Contamination; and Air Quality Studies. The information provided will be essential to engineers and managers involved in the development of simulated risk analysis as well as researchers concerned with these problems.