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Systematic reviews of relevant controlled experiments are required to set the results of individual studies in proper context, and to assess 'what works' in particular areas of social, psychological or educational intervention. In order to minimise bias, people preparing systematic reviews must identify as high a proportion as possible of the potentially eligible studies, but this phase of data collection is extremely tedious because potentially relevant studies are scattered and often very difficult to locate. This paper describes early progress in creating The Campbell Collaboration Social, Psychological, Educational & Criminological Trials Register (C2-SPECTR) to help those preparing and maintaining systematic reviews in these fields. The register currently contains over 10,000 records, including over 300 references to existing systematic reviews.