One need not be eminent in any part of profound knowledge in order to understand it and to apply it. The various segments of the system of profound knowledge cannot be separated. They interact with each other. For example knowledge about psychology is incomplete without knowledge of variation.

I think that people here expect miracles. American management thinks that they can just copy from Japan - but they don't know what to copy!

Without theory there is nothing to modify or learn.

The aim should be to work on the method of management.

To optimize the whole, we must sub-optimize the parts

You must have a supplier relationship of constant improvement.

A system is a network of interdependent components that work together to try to accomplish the aim of the system. A system must have an aim. Without the aim, there is no system.