Multilateralism is under attack and out of fashion, yet it is more needed than ever because of present and emerging challenges that require states to work together. This seminar will look at some of the reasons why multilateralism has been failing , why it is still needed, and discuss how it can be revived. It is argued that cooperation in an interconnected world full of "wicked" and complex threats and challenges is realpolitik and in the self-interest of states. Participants will brainstorm on how to make the current international system more fit for purpose. Furthermore, participants will have an opportunity to identify areas where interests between even non-liked states converge, and what can be done both diplomatically and operationally to deal with common transnational problems. In addition to lectures and interactive discussions, participants will have an opportunity to prepare and present positions in preparation for the UN Future Summit as part of a simulation.