" Closed loops are not merely an intellectual curiosity, they realistically describe the world we live in. They are small and large, subtle and intricate; they lurk in small companies, big companies, charities, corporations and governments. The majority of our assumptions have never been subject to robust failure tests. Unless we do something about it they never will be. "

― Matthew Syed , Black Box Thinking: Why Some People Never Learn from Their Mistakes - But Some Do