The Harvard Kennedy School Library Think Tank Search is a custom Google search of more than 250 U.S. and non-U.S. think tank websites. The HKS Library defines think tanks as institutions affiliated with universities, governments, advocacy groups, foundations, non-governmental organizations, and businesses that generate public policy research, analysis, and activity. Inclusion in Think Tank Search is based upon the relevancy of subject area to HKS coursework and scholarship as well as geographic coverage, the availability of the think tank’s research in full-text on the website, and the think tank’s reputation and influence upon policy making.