Joint decision-making in German federalism has often been criticized as inefficient and inflexible. This book argues for a revision of this opinion. Theoretical reasoning and case studies on the Joint Tasks (article 91 a Basic Law), federal-Lander-coordination in budget planning and cooperation of Lander governments in education policy reveal varieties and dynamics of joint decision-making. Both policies and structures of intergovernmental negotiations change over time. These dynamics can lead to stability or transformation of joint decision-making, if it can be adjusted to changing conditions. Yet it can also cause an erosion of cooperation. The studies presented in the book explore the causes and consequences of the various developments. Thus they suggest a new perspective on cooperative federalism in Germany.