Since 1995, Sweden is part of the The Comparative Study of Electoral Systems (CSES). CSES is a coordinated comparative collaboration of national research teams around the world that enables the systematic analysis of electoral behavior under globally varying institutional conditions. More than 200 scholars from over 60 nations collaborate to reach a better understanding of enduring and fundamental questions about electoral choice. The collaborative effort results in a very large number of research publications each year. A consolidated West-European multi-party democracy as Sweden represents an important case for comparative electoral researchers, not least because of the high data quality. CSES is the most important long term international collaborative project for Swedish research on elections, opinion, and democracy. The proposed research infrastructure project aims to secure Sweden’s participation and in the CSES-collaboration in the years 2018-2023. In the Swedish case, the field work for the fifth and sixth module of the CSES will be carried out in conjunction with the general elections in 2018 and 2022. The application cover costs of planning and coordinating the field work, and to document and publish the data for the Swedish part of CSES. The infra structure project makes it possible for Sweden to actively participate in the decision making in conjunction with the open applications for themes of future CSES modules.