Talk of the knowledge society is now almost universally accepted as a representation of social reality. Socially relevant actors have to adjust to it and (learn) to deal with it on a daily basis. However, academic reflections on this situation should not only state how strongly contemporary society depends on knowledge. They must also ask what is known about this knowledge itself and about society’s dependence on it. The question of knowledge in the knowledge society thus leads to the question of the opportunities and limits of the knowable, the intertwining of knowledge and non-knowledge with various forms of social logic, and an increase in knowledge conflicts. In this regard, the editors of this series want to offer an interdisciplinary discussion forum on this subject.