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The InvestigationAsk what failed, not who failed

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When It Breaks0155

The Investigation

Ask what failed, not who failed

The method of learning from an accident instead of punishing it.

III · The Machinery52 / 53

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0155 · The Primer52 / 53

Aviation, railways, and hospital medicine got safer by treating every accident as information. An independent body reconstructs what happened, publishes it, and recommends changes. Where the first question is who to blame, people hide the near misses, and the same accident quietly waits to happen to somebody else.

  • The useful question is why a reasonable person did what they did. Almost nobody chooses to cause an accident, so the conditions are usually the cause.
  • Checklists came out of this method. They exist because trained experts skip steps under pressure, not because anybody is careless.
SourceReason, Human Error (1990)
Gawande, The Checklist Manifesto (2009)

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