The aim of this volume is to explore new approaches to the problem of the constitution of the various aspects of sociality and to confront these with received ideas. Therefore many of the contributions to this volume are devoted to a rather holistic and antireductionist conception of social objects, groups, joint actions and collective knowledge. The topics, that are dealt with are: a) the question of the ontological status of social objects and their relation to physical objects, b) collective agency and c) the question whether there can be shared knowledge and shared beliefs — a rather new topic in the discussion of the social aspects of personal life.