Any one person or one organization cannot know everything and those that try only become tired and confused. Weeding means to proactively discern and purge knowledge that is no longer valid or useful. Pruning means to generate higher order abstractions such as models, rules, and principles. Humans are uniquely good at that and these competencies can be purposefully developed even further. So a competent professional has experienced no more than a few knowledge turns, while a master has certainly experienced many.
Design leverages manufacturing profitability even more than production.
The ability of a company to produce new designs reliably and rapidly hinges on the rate at which it can acquire new knowledge. Knowledge comes through experimentation. New knowledge is acquired through new experiences. So the more product cycles you can work through in a year, the greater your experience base. So if we call the knowledge you acquire and exercise in the course of one complete product implementation cycle a knowledge turn, we ll find that maximizing knowledge turns per unit of time can be a corollary of profitable manufacturing and incidentally, of happy and successful engineers.