“Complex failures occur when we have good knowledge about what needs to be done. We have processes and protocols, but a combination of internal and external factors come together in a way to produce a failure outcome,” Ms. Edmondson said. “These kinds of failures happen all the time in hospital care, for example, where there’s enough volatility or complexity in the environment that things just happen.” https://www.nytimes.com/2018/08/17/smarter-living/talking-about-failure-is-crucial-for-growth-heres-how-to-do-it-right.html