Interaction's a kind of action that occurs as two or more objects have an effect upon one another. The idea of a two-way effect's essential in the concept of interaction, as opposed to a one-way causal effect. A closely related term's interconnectivity, which deals with the interactions of interactions within systems: combinations of many simple interactions can lead to surprising emergent phenomena. Interaction has different tailored meanings in various sciences. All systems are related and in… (More on Interaction)