The encyclopaedic aspect of Barth's theology, i.e. its claim to include dogmatics in all other disciplines, has rarely been reflected in research. This can come as a surprise, given that theology today is in a precarious position in terms of its unity and the mutual relationship of its sub-disciplines. Due to the increasing "subject science" the subjects are becoming more and more distant from each other. Cross-disciplinary efforts for the unity of theology are not often made, but are essential, also for the sake of church and religious practice. Karl Barth linked his Christocentric theology of revelation to the claim of a genuinely theological connection between the theological subjects, which is based neither on a uniform philosophical reference paradigm nor on a specific concept of religion. The articles in the volume consider the frequently criticized weaknesses of this approach, but also its strengths, specifically with regard to contemporary theology.