Cultural Evolution os Human Society is non linear.
The evolution of human societies and in general of human history, do not follow a liner trend but rests mainly on mutual interactions amongst different components. Identifying the meanings of complexity in human processes which involve material, energy, and environmental factors, the cultural evolution is viewed via a complex system approach of a collective result of non-linear interactions making a series of successive transitional phases along a trajectory. The interacted multi- factorial issues derive from three concentric circles or dynamical systems, a) the internal (issues derived from within a given society), b) the external (issues derived from interaction with neighbour societies) and c) the environmental (issues related to the context and other geological phenomena).