The study of power is the nucleus of political science and international relations. As a shift of power from traditional industrial countries to emerging powers has been perceived since the turn of the century, this book aims to present innovative theoretical and empirical approaches that can increase our understanding of this transition. Scholars from the fields of international relations, international political economy, economics and security studies not only explore current theoretical debates on 'power' and 'power shifts' among entities, but also provide fresh insights into relevant aspects of international power in the 21st century. With a particular focus on aspects of international security, trade and production, new methods of identifying power and its sources are presented, and their potential implications and challenges are discussed.