We've spoken before about the late Col. John Boyd, USAF, and his formulation of the concept of the OODA Loop. He revolutionized many aspects of military strategy and tactics with his understanding of what goes into making decisions and following up on them.
The Art of Manliness has put up an excellent article explaining how Boyd conceived of the OODA Loop and developed his ideas about it. The author says of the Loop:
It’s not “groundbreaking” in the sense of revealing insight never before conceived; rather, its power is in the way it makes explicit, that which is usually implicit. It takes the basic ways we think, decide, and operate in the world — ways that often get confused and jumbled in the face of conflict and confusion — and codifies and organizes them into a strategic, effective system that can allow you to thrive in the heat of battle. It is a learning system, a method for dealing with uncertainty, and a strategy for winning head-to-head contests and competitions. In war, business, or life, the OODA Loop can help you grapple with changing, challenging circumstances and come out the other side on top.
There's much more at the link. If you haven't learned much about the OODA Loop yet, this is a great opportunity to do so - and you'll find it applicable in more walks of life than you'll believe possible. Recommended reading. (See also my earlier article on the subject.)