This book delivers a top-down understanding of relation as a macro-phenomenon in society. This understanding rests on the reconstruction of an ongoing debate in the French tradition about the purpose of a relational perspective in sociology and the social sciences. Christian Papilloud analyzes the cardinal steps of this debate, which historically relate to the concept of solidarity, expressing an ideal of social cohesion through relationships between personal and non-personal actors. In social theory, it is well-known that solidarity refers to Emile Durkheim. But little is known about the controversies generated in relation to the purpose of a relational perspective in sociology. Papilloud reconstructs and follows the