Talking About Organizations Podcast E134: Normal Accidents -- Charles Perrow (Summary of Episode)
Feb 5, 2026
A look at why some technologies stay accident-prone despite safety efforts. Discussion of complexity and tight coupling as drivers of cascading failures. Examination of industries where risks concentrate, from nuclear to chemical. Exploration of how added safety measures and operator responses can unintentionally increase danger.
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Complexity Plus Tight Coupling Makes Accidents Normal
- Complex, tightly coupled systems make some accidents inevitable rather than exceptional.
- Perrow found complexity hides fault signals and tight coupling forces failures to cascade, making accidents 'normal' in nuclear, chemical, and similar industries.
Safety Systems Can Create New Risks
- Safety systems can increase overall risk because added controls introduce new interactions and failure modes.
- Perrow argues meters and indicators may confuse operators, and corrective actions can inadvertently worsen situations in high-risk tech.
Three Mile Island As The Case Study
- The Three Mile Island 1979 accident anchored Perrow's analysis as a concrete case study of normal accidents.
- He used its confusing indicators and cascading failures to illustrate how operators misread systems and corrective steps compounded the disaster.
