Risk management deals with prevention, decision-making, action taking, crisis management and recovery, taking into account the consequences of unexpected events. The authors of this book are interested in ecological processes, human behavior, as well as the control and management of life-critical systems, which are potentially highly automated. Three main attributes define life-critical systems, i.e. safety, efficiency and comfort. They typically lead to complex and time-critical issues and can belong to domains such as transportation (trains, cars, aircraft), energy (nuclear, chemical engine.