Safety-critical systems are found in almost every sector of industry.Faults in these systems will result in a breach of safe operating conditions and exposure to the possible risk of major loss of life or catastrophic damage to plant, equipment or the environment.An understanding of the basis for the functioning of these systems is therefore vital to all involved in their operation.In particular, the interaction of the disciplines of software engineering, safety engineering, human factors and safety management is a total process whose entirety is not widely understood by those working in any of the individual fields.This book will redress that problem by providing an introduction to each constituent part with a cohesive structure and overview of the whole subject.It will be of interest to engineers, managers, students and anyone with responsibilities in these areas.