Self-organizing system

Self-organizing system is a system whose macroscopic structure and behavior emerge from local interactions among its components, without centralized control or external direction. The pattern is not designed into the system; it arises spontaneously when the components follow simple rules and interact repeatedly. Examples range from flocking behavior in birds and traffic jams in human societies to chemical oscillators and neural networks in the brain.

The concept is central to systems theory and cybernetics, where it describes how order can emerge from disorder without a designer. A self-organizing system is not merely complex; it is complex in a particular way — its organization is produced by the system itself, for the system itself. This distinguishes self-organization from imposed organization and from random aggregation. The edge of chaos hypothesis suggests that self-organization is most prolific when systems operate at intermediate levels of connectivity, neither too rigid nor too fluid.