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Campbell Collaboration is an international research network that uses systematic reviews to look at the effects of social policy interventions in areas including crime , education and international development. They are published in the open access journal Campbell Systematic Reviews
Very active research program based at ISER (University of Essex), a tax-benefit microsimulation model for the EU that enables researchers to calculate the effects of taxes/benefits on household incomes and work incentives for each country and for the EU
Research centre at Goteborg University offers free access to its cross-national time series dataset on social policy. Data for 40 countries from 1946, with an emphasis on social policy in relation to quality of government.