This is a practical book aimed at those whose daily task it is to think about and manage or regulate the risks of hazardous technologies. The book is not targeted at any one domain, but attempts to identify general tools and principles that are applicable to all organizations facing dangers of one sort or another. This could include banks and building societies just as much as nuclear power plants, oil exploration and production, chemical process plants, and air, sea and rail transport. The emphasis is placed upon the principles and practicalities of defenses against accidents, and how to meet the challenges and minimize risk.