Social systems theory
Social systems theory is a sociological framework developed by Niklas Luhmann that treats society not as a collection of individuals or institutions but as a network of operationally closed, self-referential systems of communication. Drawing directly on Maturana and Varela's concept of autopoiesis, Luhmann argued that social systems — law, economy, science, politics, art — reproduce themselves through their own operations: the legal system produces legal communications, the economy produces economic transactions, and each system uses only its own elements to continue operating.
The concept of operational closure is central. A social system is not closed to its environment — it is constantly perturbed by other systems and by psychological systems (individual consciousnesses). But it is closed with respect to its own operations: a scientific observation cannot be processed as a legal argument; an economic transaction cannot be processed as a political decision. Each system has its own binary code (legal/illegal, payment/non-payment, true/false, government/opposition) that filters environmental complexity into system-specific meaning.
This framework has profound implications for understanding modernity. Traditional sociology treated differentiation as a problem of integration — how does society hold together when specialized subsystems pursue their own logics? Luhmann reversed the question: differentiation is not a problem to be solved but the fundamental mechanism by which society increases its complexity. Modernity is not a state of fragmentation but a state of systemic closure in which each functional system develops its own self-referential dynamics, enabling society to process more complexity than any unified hierarchy could manage.