Normal Accidents¶
Perrow, C. (1984). Normal Accidents: Living with High-Risk Technologies. Basic Books.
Cited by¶
14 citations across 14 artifacts.
Each citation links to the sentence it supports in the citing article.
Primes¶
- Benign-Sampling Safety Drift
- In nuclear and process safety it is tolerated small excursions in temperature, pressure, or procedure expanding until an excursion is no longer a recoverable transient, and engineered safeguards routed around under cost pressure so the designed-safeguard count and the enacted one diverge.
This sourceAnalyzes how tolerated small excursions and routed-around safeguards in tightly coupled, complex systems (nuclear, chemical) expand until a non-recoverable transient occurs.
- In nuclear and process safety it is tolerated small excursions in temperature, pressure, or procedure expanding until an excursion is no longer a recoverable transient, and engineered safeguards routed around under cost pressure so the designed-safeguard count and the enacted one diverge.
- Boundedness
- Listed in the references but not attached to a specific claim.
- Co-location
- Keeping the two apart is what allows an analyst to say that two components never communicate and are nevertheless not independent — a verdict the everyday sense of together cannot express, and one that matters wherever independence is being assumed.
This sourceIdentifies proximity and common-mode connections as sources of unexpected coupling between components that have no functional interaction, so items sharing a region cannot be assumed independent.
- Keeping the two apart is what allows an analyst to say that two components never communicate and are nevertheless not independent — a verdict the everyday sense of together cannot express, and one that matters wherever independence is being assumed.
- Containment
- The structural insight recurs: a nuclear containment vessel, an epidemiological quarantine, a software sandbox, and a security perimeter all require the same logic: a boundary, enforcement mechanisms, and continuous vigilance, a cross-domain pattern Perrow (1984) treats systematically in his analysis of tightly coupled hazardous systems.
This sourceAnalyses how tight coupling and complex interactions in nuclear, chemical, and aerospace systems determine which barriers hold and which fail, treating the breach of a hazardous-system perimeter as a system-level property of coupling and slack.
- The structural insight recurs: a nuclear containment vessel, an epidemiological quarantine, a software sandbox, and a security perimeter all require the same logic: a boundary, enforcement mechanisms, and continuous vigilance, a cross-domain pattern Perrow (1984) treats systematically in his analysis of tightly coupled hazardous systems.
- Controllability
- T1 — Controllability cost versus value — actuator proliferation and safety risk
This sourceArgues that in tightly coupled, complex systems failures are inevitable and added controls/safeguards can themselves introduce failure modes.; reasonable support for the safety-risk side of the actuator-proliferation tension.
- T1 — Controllability cost versus value — actuator proliferation and safety risk
- Coupling
- The inter-component dependency strength
This sourceFounding statement that interactive complexity plus tight coupling makes system accidents inevitable; supports the inter-component-dependency and clarifying-commitment claims (coupling links distinguishable subsystems through specifiable channels).
- The inter-component dependency strength
- Escape and Leakage
- The fundamental commitment is that containment failures arise not from dramatic breaches but from the ordinary geometry of boundaries: cracks, gaps, microscopic porosity, or pathways that exist in the design but were never explicitly addressed, an insight Perrow (1984) developed across high-risk technologies in Normal Accidents.
This sourceSociotechnical analysis showing that in tightly coupled, interactively complex systems containment failures arise from the ordinary geometry of interactions rather than dramatic breaches; foundational to treating escape and leakage as a normal operating phenomenon.
- The fundamental commitment is that containment failures arise not from dramatic breaches but from the ordinary geometry of boundaries: cracks, gaps, microscopic porosity, or pathways that exist in the design but were never explicitly addressed, an insight Perrow (1984) developed across high-risk technologies in Normal Accidents.
- Fail-Safe
- The default-to-safe routing that assumes control pathway failure and maps failure to the predetermined safe state
This sourceArgues that tight coupling and interactive complexity make certain accidents 'normal' (inevitable) in nuclear, chemical, and aerospace systems, so failures must be designed around rather than merely prevented.
- The default-to-safe routing that assumes control pathway failure and maps failure to the predetermined safe state
- Near-Miss Normalization
- In nuclear and process safety, tolerance to small excursions in temperature, pressure, or procedure expands until an excursion is no longer a recoverable transient.
This sourceArgues that tightly coupled, complex systems (nuclear, process, aviation) drift toward failure as small excursions in temperature, pressure, and procedure are tolerated until an excursion is no longer a recoverable transient.
- In nuclear and process safety, tolerance to small excursions in temperature, pressure, or procedure expands until an excursion is no longer a recoverable transient.
- Reserve
- If the surplus still looks valuable, it was waste being justified by appeal to contingency; if the surplus stops looking valuable, it was a genuine reserve, a category distinction that aligns with Perrow's (1984) analysis of how coupling and slack determine which surpluses are decorative and which are load-bearing in high-risk systems.
This sourceAnalyses how tight coupling and complex interactions in nuclear, chemical, and aerospace systems determine which reserves are decorative and which are load-bearing; the contingency-removal counterfactual maps onto Perrow's coupling-and-slack framework.
- If the surplus still looks valuable, it was waste being justified by appeal to contingency; if the surplus stops looking valuable, it was a genuine reserve, a category distinction that aligns with Perrow's (1984) analysis of how coupling and slack determine which surpluses are decorative and which are load-bearing in high-risk systems.
- Responsibility Diffusion
- Instead of asking "Why is no one doing this?" (a question inviting blame), diffusion asks "How is responsibility structured?" and "What psychological attribution happens under plural responsibility?"—the structural reframing Perrow (1984) advanced in his analysis of normal accidents in tightly coupled, complex systems.
This sourceAnalyses how tight coupling and complex interactions in nuclear, chemical, and aerospace systems determine which reserves are decorative and which are load-bearing; the contingency-removal counterfactual maps onto Perrow's coupling-and-slack framework.
- Instead of asking "Why is no one doing this?" (a question inviting blame), diffusion asks "How is responsibility structured?" and "What psychological attribution happens under plural responsibility?"—the structural reframing Perrow (1984) advanced in his analysis of normal accidents in tightly coupled, complex systems.
Domain-specific¶
- Latent-Path Activation
- The Three Mile Island accident (1979) is the textbook case
This sourceThe book that made Three Mile Island the paradigm case of accidents from interactive complexity - it opens with 'Normal Accident at Three Mile Island' and builds its analysis from it.
SupportedVerified against the source
- The Three Mile Island accident (1979) is the textbook case
Mechanisms¶
- System-of-Systems Causal Mapping
- It formalizes what normal accident theory warns about — that in tightly coupled, interactively complex systems, a small local failure can propagate across interfaces into a system-level accident that no single operator could foresee.
This sourceExplains that tightly coupled, interactively complex systems can propagate small local failures into system-level accidents that no single operator can foresee.
- It formalizes what normal accident theory warns about — that in tightly coupled, interactively complex systems, a small local failure can propagate across interfaces into a system-level accident that no single operator could foresee.
- Systems-of-Systems Engineering
- … once every interface is tightened for performance, a fault in one constituent propagates through the seams and the whole degrades at once — the normal accidents pattern, in which tight coupling plus interactive complexity makes cascading failure a property of the architecture rather than of any one part.
This sourceExplains normal accidents as system-level outcomes of interactive complexity combined with tight coupling, rather than isolated defects in a single part.
- … once every interface is tightened for performance, a fault in one constituent propagates through the seams and the whole degrades at once — the normal accidents pattern, in which tight coupling plus interactive complexity makes cascading failure a property of the architecture rather than of any one part.
Verification¶
Does it exist? Not checked yet. This entry carries no identifier to resolve. It was extracted from the citation as written in the article, normalized, and deduplicated against the rest of the registry.
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Links previously used in the corpus¶
Before the registry existed this work was also linked 4 other ways.
- https://archive.org/details/normalaccidentsl00perr ×2
- https://books.google.com/books/about/Normal_accidents.html?id=N3hRAAAAMAAJ ×2
- https://www.google.com/books/edition/Normal_Accidents/VC5hYoMw4N0C ×2
- https://archive.org/details/normalaccidentsl0000perr ×1
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