Comments on the Third Edition: ’It's in the world's best interest to read Dekker’s book. The Field Guide is nothing short of a paradigm shift in thinking about human error, and in my domain of software and Internet engineering, it should be considered required reading. This Third Edition is much better than the Second, and the layout of the material is far more accessible.’ John Allspaw, SVP, Infrastructure and Operations, Etsy ’If you design equipment or operating procedures, if you investigate accidents or deal with safety, this is an essential book. Sidney Dekker, a leading world authority on "human error" has enhanced his already exceptional "Field Guide" to be a concise, readable guide to both design of equipment and procedures and also the analysis of mishaps. The label "human error" is misleading and its use prevents discovery and correction of the true underlying causes of incidents. So read about hindsight bias, about the difference between the view from inside the system rather than from outside, and about difference between the blunt end (where you should do your work) and the sharp end (where people tend to focus). Read, learn, and put these ideas into practice. The results will be fewer incidents, less damage, less injury.’ Don Norman, author of The Design of Everyday Things ’The Third Edition of Sidney Dekker's Field Guide to Understanding Human Error provides a solid practical framework for anyone wanting to make sense of safety science, human factors analysis, and the New View approach to conducting investigations of incidents and accidents. The trademark direct and passionate style that is common in Dekker's work focuses on the circumstances of frontline operators and managers working in complex systems, as well as the challenges of the safety investigator. Dekker does not mince his words ("Any human factors investigation that does not take goal conflicts seriously does not take human work seriously") and is clearly suppor