Challenging the establishment [Engineering Safety]

What's the connection between a space shuttle explosion, a plane crash in Afghanistan and outbreaks of food poisoning in Scotland and Wales? A common thread links these fatal disasters and many more besides. It's the 'normalisation of deviance'.There was more to the shuttle explosion than hardware failures alone. Senior managers were allowing errors that the shuttle wasn't designed to cope with, while junior engineers were screaming for help and being ignored.