Management, business, leadership and investing quotes and many other famous quotes

In a system the best way to treat a problem is seldom where the problem appears, because of the interactions of the parts.
Your purpose is to identify where in the process things go wrong, not who messed up. Look for systemic causes, not culprits.
Best efforts are essential. Unfortunately, best efforts, people charging this way and that way without guidance of principles, can do a lot of damage.