The document discusses the social system of schools. It states that schools are social systems comprised of interacting personalities bound together in an organic relationship. As a social system, the school is characterized by an interdependence of parts, a clearly defined population, differentiation from its environment, and its own complex network of social relationships and culture. Key elements that make up the social system of the school include its structure of hierarchical roles and expectations; individual students and teachers; shared culture and values; informal power relations; its core function of teaching and learning; interactions with the external environment; and outputs such as educated students.