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Great diagrams illustrating the variable margin of safety. You might like Erik Hollnagel's stuff on dynamic non-events, particularly his representation of outcome activities and their distance from limits of unacceptable performance (graph on slide 9 i think): https://www.hqsc.govt.nz/assets/Our-work/System-safety/Resilient-healthcare/Publications-resources/Delivering-resilient-health-care-Dec-2018.pdf

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