The authors seek to develop an analytical framework for the systematic study of the chairmanship office and its potential impact on multilateral negotiations. It elaborates on its origins, the parameters and conditions of chair’s effectiveness, and the performance of the chair’s functions. Focusing on the UN, this work seeks to go beyond existing accounts, offering further insights and extending the discussion beyond the Security Council. Without ignoring the pivotal importance of the Security Council, the book broadens the scope of analysis to other significant UN bodies and institutions including ad hoc Working Groups and several Conferences set up for specific international issues. Evaluating material from a wide range of sources and providing a deeper understanding of UN political dynamics, this work will appeal to scholars of the UN system, international organisations and global governance.