"For the purposes of this search, think tanks are defined as institutions affiliated with universities, governments, advocacy groups, foundations, non-governmental organizations, and businesses that generate public policy research, analysis, and activity. The list represents a mixture of partisan and non-partisan think tanks." - from the Harvard Kennedy School of Government
Think Tank Search is a custom Google Search of the websites of institutions that generate public policy research, analysis, and activity. These sites are affiliated with universities, governments, advocacy groups, foundations, and non-governmental organizations.