Open System

A system that exchanges matter, energy, information, or influence with its environment—it's open to outside input, open to change, open to learning. Open systems are the default in nature: ecosystems exchange nutrients, economies exchange goods, relationships exchange feelings. Open systems can adapt, evolve, and surprise you, which is both their strength (they can improve) and their challenge (they're unpredictable). Open systems are what therapists work with, what managers struggle with, and what anyone in a relationship is definitely dealing with. The opposite of an open system is a closed system, which is either a very simple machine or a person who's decided never to change.