In the 2013 rankings, Brookings Institution (United States) was listed at the top among all global think tanks for the second year in a row. Chatham House (United Kingdom) was ranked at No. 2, followed by the Carnegie Endowment for International Peace (United States) at No. 3. The Center for Strategic and International Studies (United States), Stockholm International Peace Research Institute (Sweden), Bruegel (Belgium), Council on Foreign Relations (United States), Rand Corporation (United States), International Institute for Strategic Studies (United Kingdom), and Woodrow Wilson International Center for Scholars (United States) were listed at No. 4~10, respectively. From around the world, 6,826 think tanks were invited to participate in the voting process from August-December 2013. Twenty-five think tanks from Korea, including the Korea Development Institute (KDI), were nominated to be among the world’s top think tanks. Experts from 1,950 peer institutions participated in the 2013 nomination and selection process, which took place over two voting rounds.