A fundamental military axiom is to reinforce success.
Reinforcing success is a strategic concept used in many areas of decision making and management. Originally a military doctrine, the term is also used in theories related to parenting, business and other fields. It is essentially a selection criterion, or a prioritizing principle. A course of action is selected from various options on the basis of previous results of similar actions. The basic idea is: if it works, keep doing it; if it doesn’t, don’t invest more in something that’s failing.
I believe businesses should apply this principle to projects, products and product features. So not surprisingly I apply this as a guiding principle in my own work as an agile programme manager.