It's only the last turn of a bolt that tightens it - the rest is just movement.
There are four purposes of improvement: easier, better, faster, and cheaper. These four goals appear in the order of priority.
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.
Lean is a way of thinking- not a list of things to do
Those who are not dissatisfied will never make any progress