It's only the last turn of a bolt that tightens it - the rest is just movement.
Those who are not dissatisfied will never make any progress
We have to grasp not only the Know-How but also 'Know Why', if we want to master the Toyota Production System.
Improvement usually means doing something that we have never done before.
Lean is a way of thinking- not a list of things to do
The best approach is to dig out and eliminate problems where they were assumed not to exist.