The worker is not the problem. The problem is at the top! Management!
People care more for themselves when they contribute to the system.
Profit in business comes from repeat customers
When a system is stable, telling the worker about mistakes is only tampering.
Let us ask our suppliers to come and help us to solve our problems.
I should estimate that in my experience most troubles and most possibilities for improvement add up to the proportions something like this: 94% belongs to the system responsibility of management 6% special