Those who are not dissatisfied will never make any progress
It's only the last turn of a bolt that tightens it - the rest is just movement.
A relentless barrage of 'why’s' is the best way to prepare your mind to pierce the clouded veil of thinking caused by the status quo. Use it often.
The most dangerous kind of waste is the waste we do not recognize.
The best approach is to dig out and eliminate problems where they were assumed not to exist.
We have to grasp not only the Know-How but also 'Know Why', if we want to master the Toyota Production System.