Book excerpt: The future of the G20 is uncertain despite being developed to address the 2008 global financial crisis. This book considers the significance of the G20 by engaging various accounts of International Relations theory to examine the political drivers of this form of global governance. International Relations theory represents an array of perspectives that analyse the factors that drive the G20, how the G20 influences world politics and in what ways the G20 could or should be reformed in the future.