Two principal variables are identified - institutional credibility and political culture - as a measure of comparison between the two think tank models. Supranational think tanks have an inherent credibility with the institutions of the EU, which allows them to direct their resources and efforts to activities and outputs where they hold a comparative advantage. US think tanks lack such institutional recognition and so need to prove their credibility to their main constituencies. The result is that an adversarial and individualistic political culture has informed the norms and activities of Washington think tanks while the consensus-driven and collectivist political culture of Europe has influenced supranational think tanks. Think tanks are far from newcomers to the public policy scene, but our broader understanding of their role, structure and how they assess their own achievements is not yet fully developed.
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