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Normal Accident / System Accident
- An accident that is inevitable, given a system with
Normal Accidents some key points from Charles Perrow, Normal - - PowerPoint PPT Presentation
Normal Accidents some key points from Charles Perrow, Normal - - PowerPoint PPT Presentation
Normal Accidents some key points from Charles Perrow, Normal Accidents (New York: Basic Books, 1984). 1 Normal Accident / System Accident An accident that is inevitable, given a system with interactive complexity and tight coupling. (p. 5)
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Interactive Complexity
- Linear interactions
- Simple, desirable
- Expected, familiar sequences
- Common (overwhelmingly predominate in most systems)
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Interactive Complexity
- Complex interactions
- Branching paths
- Feedback loops
- Jumps from one linear sequence to another
- Unfamiliar, unplanned sequences
- Common mode connections
- Invisible, not immediately comprehensible
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Complex vs. Linear Systems
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Coupling Tendencies
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