The Toyota Way, written by the co-author of this book, Jeffrey Liker, summarized the management principles of Toyota in a 4P model: Philosophy, Proce… - Jeffrey K. Liker

Basically people will do what upper management wants them to do. So if that's consistent, if they're not whipsawed and being governed by different priorities, they learn what is truly important and what is not….

All we are doing is looking at the time line from the moment the customer gives us an order to the point when we collect the cash. And we are reducing that time line by removing the non-value-added wastes. (Ohno, 1988)

The vision for Lean, I believe, should be achieving operational excellence based on a clearly defined value system and a way of engaging people in Continuous Improvement. The goals can generally be summarized as Safety, Morale, Quality, Cost, and Productivity.