We have to grasp not only the Know-How but also 'Know Why', if we want to master the Toyota Production System.

- Shigeo Shingo

Improvement usually means doing something that we have never done before.

- Shigeo Shingo

Lean is a way of thinking- not a list of things to do

- Shigeo Shingo

The most dangerous kind of waste is the waste we do not recognize.

- Shigeo Shingo

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.

- Shigeo Shingo

Unless you change direction, you will end up where you are headed.

- Shigeo Shingo

There are four purposes of improvement: easier, better, faster, and cheaper. These four goals appear in the order of priority.

- Shigeo Shingo

When you buy bananas all you want is the fruit not the skin, but you have to pay for the skin also. It is a waste. And you the customer should not ha…

- Shigeo Shingo

It's only the last turn of a bolt that tightens it - the rest is just movement.

- Shigeo Shingo