He that would run his company on visible figures alone will in time have neither company nor figures.
Hard work and best efforts will not by themselves dig us out of the pit.
A system can not understand itself.
Without theory we can only copy.
For Quality: Stamp out fires, automate, computerize, M.B.O., install merit pay, rank people, best efforts, zero defects. WRONG!!!! Missing ingredient: profound knowledge.
Management's job is to optimize the whole system.