The Campbell Collaboration is a non-profit research network that aims to produce and disseminate high-quality systematic reviews on the effectiveness of social interventions. The Campbell Collaboration’s work is underpinned by the practical aim of informing evidence-based decision-making: by increasing the accessibility of high quality systematic reviews and evidence synthesis it aims to equip policymakers, practitioners, and services users with quality evidence to inform their decision-making. Seed funding for the Campbell Collaboration was initially provided by the Smith Richardson Foundation in 1999. When the Campbell Collaboration was founded in 2000, three coordinating groups with substantive focus were created: education, social welfare, and crime and justice. The editorial process for systematic reviews is managed by the coordinating groups; however, a review may be co-registered across coordinating groups or co-registered with the Cochrane Collaboration if appropriate.