Many system safety standards inadequately define safety terms and sometimes define them incorrectly. This is the first book explicitly devoted to defining system safety terms and concepts as a convenient desk reference manual and helps the safety professional find their way through the current jungle of terms and definitions used in books, guidelines, standards and even laws.. The book provides the definition of many safety terms rather than having to search through a slew of different manuals and documents looking for the exact definition. The second purpose of the book is to begin an effort to adopt a single common and correct definition for all safety-related terms. Because many safety-related terms are misunderstood and many others are actually often defined incorrectly the goal of this book is to provide clear and correct definitions for safety-related terms.