I've never understood the "5 Why's" method to be taken that literally. In my experience at a major manufacturing company it was taught as a way of reminding peo

I've never understood the "5 Why's" method to be taken that literally. In my experience at a major manufacturing company it was taught as a way of reminding people to think deeper about a problem and not stop at the first level and think that you have arrived at the root cause. Sometimes it's four Whys', sometimes it's six.