This work offers an analysis of changing world order at the beginning of the 21st century. It examines the progression from international to global governance, focusing on the fundamental change of actors, agendas, collective decisionmaking, and the role of the UN system. Globalization does not only mean a change of relationship between governments and market forces. It also has important implications for the identities and activities of transnational social actors. International governance, the authors argue, faces three different challenges: the technological revolution, globalization, and the end of the cold war-leading to jurisdictional, operational, incentive, and participatory gaps in governance with which international governance systems cannot adequately cope. In attempting to respond to these new problems, international governance systems have engaged in a multifaceted move toward global governance, reacting to these challenges in part by transforming themselves.