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The Comparative Study of Electoral Systems (CSES) is a collaborative, cross-national, multi-level survey research data collection conducted by election study teams in over fifty countries around the world. A consistent set of questions are asked in each country in order to facilitate comparative analysis. The resulting data sets are combined and made available for free download from the CSES website. By providing individual, district and system level data within a single data set, CSES provides researchers and policy makers with the opportunity to link political context with political behavior in ways not before possible.