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Corporations, not-for-profit groups and governments spend billions of dollars every year on diversity training—without knowing whether the programs work. A review of almost 1,000 studies on interventions aimed at reducing prejudice found that most programs weren’t tested. For the few that were, including media campaigns and corporate-diversity training, the effects, wrote Elizabeth Levy Paluck of Princeton and Donald P. Green of Yale in the Annual Review of Psychology (2009), “remain unknown.”