Abstract
The Drug Effectiveness Review Project (DERP) is an alliance of fifteen states and two private organizations, which have pooled resources to synthesize and judge clinical evidence for drug-class reviews. The experience shines a bright light on challenges involved in implementing an evidence-based medicine process to inform drug formulary decisions: When should evidence reviewers accept surrogate markers and assume therapeutic class effects? How open and participatory should review procedures be? Should reviewers consider cost-effectiveness information? What is the appropriate role of the public sector in judging evidence? The DERP illustrates that attempts to undertake evidence-based reviews, apart from the methods themselves, which continue to evolve, involve questions of organization, process, and leadership.

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