In 1950 six nations created the European Coal and Steel Community, laying the foundations for what would later become the European Union. Since then many other regions have integrated and the number of regional organizations has proliferated. Regional organizations are key actors in tackling tough problems, such as protecting human rights, preventing and resolving conflict, strengthening regional cooperation, and promoting economic growth.The purpose of this issue's Forum, consisting of five articles, is to provide readers with a theoretical and practical overview of key aspects of...