Abstract

We judge actions to be rational if means are adequate to ends. In modern societies, innumerable actions are interconnected into complex systems. Does rationality, then, become a feature of systems? If so, it will not do to view means in the light of ends, Niklas Luhmann maintained. In ‘The Concept of Purpose and Systems Rationality’ (‘Zweckbegriff und Systemrationalität’) (1968), he defined the rationality of systems as their capacity to reduce complexity (“Reduktion von Komplexität”); in his later work, Luhmann elaborated and partly transformed that account. Dorschel and Kettner put his views under scrutiny.