Social System

Social system is a central term in sociological systems theory. The term draws a line to ecosystem, biological organisms, psychical systems and technical systems. They all form the environment of social systems. Minimum requirements for a social system is interaction of at least two personal systems or two persons acting in their roles. The first who formulated a systematic theory of social systems was Talcott Parsons where it was a part of his AGIL paradigm yet the social system is only a segment (or a "subsystem") of what Parsons calls action theory; however, Vilfredo Pareto had used the term, "social system," earlier but only as a sketch and not as an overall analytical scheme in the sense of Parsons.

Jay Wright Forrester describes three counterintuitive behaviours as important: causes from symptoms are often far removed in time and space, identifying leverage points, conflicting short + long-term consequences.