Introduction

The 2015 Global Go To Think Tank Index (GGTTI) marks the ninth year of continued efforts by the Think Tanks and Civil Societies Program (TTCSP) at the University of Pennsylvania to acknowledge the important contributions and emerging global trends of think tanks worldwide. Our initial effort to generate a ranking of the world’s leading think tanks in 2006 was a response to a series of requests from donors, government officials, journalists, and scholars to produce regional and international rankings of the world’s preeminent think tanks. Since its inception, our ongoing objective for the GGTTI report is to gain understanding of the role think tanks play in governments and civil societies. Using this knowledge, we hope to assist in improving the capacity and performance of think tanks around the world.

Since 2006, the ranking process has been refined and streamlined, and the number and scope of the institutions and individuals involved has steadily grown. The process, as in past years, relies on a shared definition of public policy research, analysis, and engagement organizations, a detailed set of selection criteria, and an increasingly open and transparent nominations and selection process. As part of the nominations process, all 6,846 think tanks catalogued in the TTCSP’s Global Think Tank Database were contacted and encouraged to participate, in addition to over 4,750 journalists, policymakers, public and private donors, and functional and regional area specialists. This group of peers and experts was surveyed to both nominate and rank public policy research centers of distinction for 2015.

To refine and validate the generated ranking lists, TTCSP assembled Expert Panels comprised of hundreds of members from a wide variety of backgrounds and disciplines. Additionally, new media – the website and social media presence – helped us communicate and disseminate information about criteria for this year’s Index to a wider audience (please see “Methodology and Timeline” for the complete set of nomination and ranking criteria, and “Appendices” for a detailed explication of the ranking process). Given the rigor and scope of the nomination and selection processes, the rankings produced thus far have been described as the insider’s guide to the global marketplace of ideas.