Never be satisfied with inaction. Question and redefine your purpose to attain progress. - Jeffrey K. Liker

Be responsive to the day-by-day shifts in customer demand rather than relying on computer schedules and systems to track wasteful inventory.

No matter how many improvements have been made, every process is still full of waste and rife with opportunity to improve.

The Toyota Way, written by the co-author of this book, Jeffrey Liker, summarized the management principles of Toyota in a 4P model: Philosophy, Process, People, and Problem Solving