Those who are not dissatisfied will never make any progress
The best approach is to dig out and eliminate problems where they were assumed not to exist.
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.
Unless you change direction, you will end up where you are headed.
Improvement usually means doing something that we have never done before.