The probability of a never event is also approx. 3 x 10-5 (1 per 31,144 procedures; Simcock, 2018). About as reliable as you’d find in any field of work, esp. complex work. The term itself is problematic and incompatible with risk-based (ALARP) approach.https://twitter.com/c7rky/status/948169919266422784 …
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If the only permissible calculated risk is zero, then the only approach is to stop all operations. An alternative approach is to identify Always Conditions, which must always be met (e.g., re : staffing, equipment, beds, competency/expertise, rostering, demand & flow management)
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Replying to @StevenShorrock
At no point have I seriously expected Never Events to never happen. That said, I'm still rather fond of the term, as I always thought it captured the extreme nature of the negligence involved. If safety procedures were ALWAYS followed, never events are supposed to be impossible.
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Replying to @C7RKY
But the data show that: The probability of Never Events is as low as for any complex task in any industry (human reliability doesn’t get much better than 99.997%) Resources are often suboptimal/not as designed/imagined (e.g. checklist implementation, staffing, workload, pressure)
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Replying to @StevenShorrock
I've already said I don't expect zero. And yet the aviation industry managed to avoid killing a single passenger anywhere in the world last year? Are they just better at doing what they're ALWAYS supposed to do?
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Replying to @C7RKY
Yes, I know. But “never” means zero. Aviation death risk is extremely low (esp. for commercial scheduled passenger), but about 100x less complex, lower demand/pressure, better resourced, and less messy generally (not starting with a sick airplane).
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Replying to @StevenShorrock @C7RKY
Also vastly different safeguards in aviation. There have been, e.g., landing on or taking off from taxiways, landing wheels up, running off end of runways, clipping wings when taxiing, losses of separation, but a little bit of blue sky, plane itself or pilot protects passengers.
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Replying to @StevenShorrock
To be honest, I lost an entire day yesterday to one tweet a wrote comparing healthcare to aviation. And my only focus was on the impact of relative candour levels. I'd really prefer not to lose any more time to it. I'll stay focussed on healthcare, I think. Thanks though.
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I know - sorry Alison! 
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