This volume explores the summits? performance, the division of labour during their coexistence, their comparative strengths and limitations, and how the future partnership could be improved to benefit the global community. The authors explain the recent evolution and performance of the G8 and G20 summits and their evolving empirical relationship. They consider the G8/G20 relationship with other actors engaged in global governance, notably the major multilateral organizations and civil society. They assess G7/8 and G20 effectiveness and accountability. And they identify, based on this empirical and analytical foundation, how the relationship can be improved for today?s tightly wired world.