Abstract
In the early 1980s, Niklas Luhmann introduced autopoiesis theory to sociology and redefined social systems concept as systems of communication. In this paper, by referring to Gordon Pask's "Conversation Theory", which Luhmann also referred to, we examine why Luhmann attached importance to the communication concept. The reason lies in that we can understand stability of social systems not as an equilibrium or regulation but as a continuous process of communication by using autopoietic model of social systems.
