https://en.wikipedia.org/wiki/OODA_loop
The OODA loop was developed by military strategist John Boyd, to explain how to direct one's energies to defeat an adversary and survive. Boyd emphasized that "the loop" is actually a set of interacting loops that are to be kept in continuous operation during combat. Boyd also indicated that the phase of the battle has an important bearing on the ideal allocation of one's energies. Boyd's views on the OODA loop are much deeper, richer, and more comprehensive than the common interpretation of the "rapid OODA loop" idea.