In the Collaborative Research Centre / SFB 1150 “Cultures of Decision-Making”, over fifty junior and senior researchers from several disciplines (history, literature, law, philosophy, cultural anthropology, Jewish and Byzantine studies) worked together to investigate social practices and cultural conditions of decision-making in a historical and interdisciplinary perspective from the Middle Ages to the present. It comprised three project areas with a total of twenty subprojects as well as an integrated research training group. In the research platforms, fundamental theoretical and conceptual issues of the Centre’s research programme were under discussion.