Normalisation of Deviance and the Challenger Disaster

HN commenters cite it whenever a thread involves ignored warnings, shortcuts or routine risk, as the clearest introduction to the concept.

Astronaut Mike Mullane explains normalisation of deviance, where teams gradually come to accept violations of their own safety standards. He uses the Challenger shuttle disaster as the main case, drawing on NASA's ignored warnings before the launch. It is the first part of a talk given to a fire-fighters' association.