Engineering a Safer World
Systems Thinking Applied to Safety
By: Nancy Leveson
About This Book
Engineering has experienced a technological revolution, but the basic engineering techniques applied in safety and reliability engineering, created in a simpler, analog world, have changed very little over the years. In this groundbreaking book, Nancy Leveson proposes a new approach to safety -- more suited to today's complex, sociotechnical, software-intensive world -- based on modern systems thinking and systems theory. Revisiting and updating ideas pioneered by 1950s aerospace engineers in their System Safety concept, and testing her new model extensively on real-world examples, Leveson has created a new approach to safety that is more effective, less expensive, and easier to use than current techniques. Arguing that traditional models of causality are inadequate, Leveson presents a new, extended model of causation (Systems-Theoretic Accident Model and Processes, or STAMP), then then shows how the new model can be used to create techniques for system safety engineering, including accident analysis, hazard analysis, system design, safety in operations, and management of safety-critical systems. She applies the new techniques to real-world events including the friendly-fire loss of a U.S. Blackhawk helicopter in the first Gulf War; the Vioxx recall; the U.S. Navy SUBSAFE program; and the bacterial contamination of a public water supply in a Canadian town. Leveson's approach is relevant even beyond safety engineering, offering techniques for "reengineering" any large sociotechnical system to improve safety and manage risk.
AI Overview
"Engineering a Safer World: Systems Thinking Applied to Safety" by Nancy Leveson is a groundbreaking book that introduces a new approach to safety engineering, grounded in modern systems thinking and systems theory. Here is a comprehensive overview of the book:
Key Themes
Systems Thinking: The book emphasizes the importance of considering systems as a whole rather than focusing solely on individual components. It argues that safety is an emergent property arising from the interactions and relationships within the system, rather than from the components themselves.
Sociotechnical Context: Leveson highlights that systems are designed, built, and operated within a larger sociotechnical context. This includes regulatory environments, organizational structures, and human factors, all of which influence safety.
Extended Model of Causation: The book introduces the Systems-Theoretic Accident Model and Processes (STAMP), a new extended model of causation. This model goes beyond traditional models of causality by examining the hierarchical levels of control within a system and how failures at these levels can lead to accidents.
Accident Analysis and Prevention: Leveson provides techniques for analyzing accidents and identifying opportunities to prevent future incidents. This involves examining each level of control in the system to understand why accidents occurred and how they could have been prevented.
Real-World Applications: The book applies the new safety techniques to various real-world events, including the friendly-fire loss of a U.S. Blackhawk helicopter, the Vioxx recall, the U.S. Navy SUBSAFE program, and the bacterial contamination of a public water supply in a Canadian town. These case studies demonstrate the practical application of the STAMP model in improving safety and managing risk.
Plot Summary
The book does not follow a traditional narrative structure but rather presents a systematic approach to safety engineering. It begins by questioning the foundations of traditional safety engineering, particularly the confusion between safety and reliability. Leveson then introduces the STAMP model, which is designed to analyze accidents and identify systemic failures that contribute to safety incidents.
The book provides a broad overview of current practices in system safety and offers a reference for understanding the state of the field. It also presents a new approach to safety that is more effective, less costly, and easier to use than current techniques. This new approach includes techniques for accident analysis, hazard analysis, system design, safety in operations, and management of safety-critical systems.
Critical Reception
The book has received positive reviews for its innovative approach to safety engineering. Here is a review excerpt from Goodreads:
- Review by Bugzmanov222: "I can't believe it took me more than a month to finish this one. The topic is the application of systems theory to the design of safer systems and the analysis of accidents in order to prevent future accidents. Leveson's approach is relevant even beyond safety engineering, offering techniques for 'reengineering' any large sociotechnical system to improve safety and manage risk." (February 13, 2022).
Overall, "Engineering a Safer World" is a seminal work in the field of safety engineering, offering a comprehensive and practical guide to improving safety through systems thinking and the STAMP model. Its critical reception highlights its relevance and impact in the field of safety and risk management.