The Sciences of the Artificial

The Sciences of the Artificial is the 1969 book in which Simon argued that designed things — organizations, software systems, economic policies, curricula, institutions — deserve their own science, distinct from the natural sciences that study the world as it is. The argument rests on a single structural distinction: every artificial system has an inner environment (its design, architecture, internal logic) and an outer environment (the world in which it operates, the problems it addresses, the constraints it faces). The system succeeds when its inner environment is well-adapted to the demands of its outer environment; it fails when the two diverge. The book establishes that design, properly understood, is the rigorous management of this interface — a form of knowledge as demanding as any natural science, though one that modern universities had largely displaced from their curricula. The framework has proven remarkably durable and has acquired new relevance in the AI age, where the design of interaction structures between humans and