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The systematic reviews of research evidence prepared and maintained by contributors to the Campbell Collaboration's Review Groups will be designed to meet the needs of those with a strong interest in high quality evidence on "what works". These include members of the public who want to keep abreast of the best evidence on the effects of social and educational policies and practices, service providers, policy makers, educators and their students, and professional researchers. Campbell systematic reviews will be published electronically so that they can be updated promptly as relevant additional evidence emerges, and amended in the light of criticisms and advances in methodology.