book
The Field Guide to Understanding Human Error
Dekker, Sidney. The Field Guide to Understanding Human Error. 2nd ed. Farnham, UK: Ashgate, 2006.
Related concepts4 concepts
Concept
Accountability
Accountability names whether consequence still reaches the people who can respond. It becomes important when scale, narrative, or abstraction thins contact between action and effect. It helps preserve correction and proportionate answerability, but can fail when moral sorting replaces sustained contact with outcomes. It differs from responsibility because accountability emphasizes exposure to consequence; responsibility includes the ongoing obligation to account even when control is partial.
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Concept
Feedback
Feedback names how systems stay in contact with their own effects. It becomes important whenever action and consequence are separated by time, scale, or abstraction. It helps preserve learning, correction, and trust in ongoing coordination, but can fail when dashboards stay green while lived harm accumulates off the ledger. It differs from trust because feedback is the returning signal itself; trust is the bridge that lets people act before every signal arrives. It differs from correction because feedback is what returns; correction is the work of updating in response.
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Concept
Harm
Harm names where cost lands when influence is exercised—who absorbs it, who is kept in view, and what displacement is treated as acceptable. It marks the lived consequence of action, authority, design, or coordination. The visibility dimension matters—who is harmed in particular, not on average? Can they name it? Can they respond? Does the system register it or treat it as acceptable loss? Harm continues while interpretation expands, briefings make harm legible without smaller, people can still tell when something is doing harm. The question harm raises—is harm unchanged outside while we analyze inside? When does naming harm substitute for reducing it? The failure mode—harm persists while moral work feels complete, delays continue after excellent postmortems, harm becomes statistical at scale. The restoration path—return to particular harms and people, check effects outside the room after briefings, stop when outcomes for people are unchanged, pair analysis with named remedy attempts, accept harm as inevitable without abandoning response.
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Concept
Responsibility
Responsibility names what continues after action—the obligation to remain responsive to what one's choices set in motion. It becomes important when systems scale beyond any one person's control but moral weight still accumulates. It helps preserve sustained answerability, but can fail when responsibility collapses into futility or when symbolic gestures replace contact with effects. It differs from accountability because responsibility names the enduring relation; accountability names whether consequence still reaches those who can respond.
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