TWW is a great book.

Another book on the TPS: https://www.amazon.com/dp/0915299143

I would look beyond books to seek out great organizers, leaders, and organizations in manufacturing. Dell is another good example. There are many others spread around the world.

Somewhat agree. If you really want to understand lean principles, start with the masters of the topic and consider reading some books about Toyota. The first in the list below is a wonderful introduction to how lean manufacturing principles evolved at Toyota over decades. The others can provide more hands on experience on the topic and if you can mentally translate manufacturing principles to software construction techniques, everything will start to make sense.

The Machine that Changed the World

https://www.amazon.com/Machine-That-Changed-World-Revolution...

Toyota Production System Beyond Large Scale

https://www.amazon.com/Toyota-Production-System-Beyond-Large...

The Toyota Way

https://www.amazon.com/Toyota-Way-Management-Principles-Manu...

Out of the Crisis

https://www.amazon.com/Out-Crisis-W-Edwards-Deming/dp/091137...

If you are interested in the root of this methodology, consider reading Toyota Production System by Taiichi Ohno. Page 17 starts the discussion on how asking Why Five times is a method of determining root cause. This book isn't popular, but is worth your time.

http://www.amazon.com/Toyota-Production-System-Beyond-Large-...