Normal Accident Theory
Version 1.0.0 · Updated 2026-07-30
CORE DEFINITION
In tightly coupled and complex systems (such as nuclear power plants, financial markets), accidents are not accidental but inevitable (normal). Because small failures can unpredictably trigger chain reactions, they cannot be completely avoided by strengthening management.
SCAFFOLDING EFFECT
Reduce cognitive load
- Respect the system: When we build complex systems like microservices or AI, we must acknowledge that "failure is the norm." Design focus should shift from "preventing failures" to "how to recover quickly after failures" (resilience engineering).
Anchor fast decisions
In tightly coupled and complex systems, small failures chain-react in unpredictable ways, making accidents a "normal" product of the system that cannot be eradicated by more control.
MINIMUM ACTION
In progress 0/4Practice this model in one real situation:
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Source support: Explicit
- en.wikipedia.orghttps://en.wikipedia.org/wiki/System_accidentverified
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