The EUENGAGE Dataset collects data from the EUENGAGE Project, which ran from 2015 to 2018. For more information on the EUENGAGE Project, please visit the dedicated website: www.euengage.eu It includes data from: The EUENGAGE Mass and Businesspeople panel surveys, which were conducted in ten Member States of the European Union: Czech Republic, France, Germany, Greece, Italy, Netherlands, Poland, Portugal, Spain, and United Kingdom in 2016 and 2017. The EUENGAGE elite surveys, which were conducted in the same ten Member States in 2016 and 2017. The Pre- and Post- Deliberation surveys, which were conducted in October 2016, respectively before and after the online deliberation named “E-Voice”. The EUENGAGE Dataset also includes Chapel Hill Expert Survey (CHES) data for party positioning. Values for each variable of CHES datasets have been matched to survey respondents’ voting intentions, party identifications (mass and B2B), or party of election (politicians). For instance, for a respondent expressing the intention to vote for party XY (variable QG2_T1) in wave 1 (T1), there will be a set of CHES variables from CHES 2014 with values corresponding to the positioning of party XY on all the issues included in CHES 2014. Likewise, party preferences expressed in wave 2 (T4) will correspond to the values of party positioning measured by CHES 2017. When using CHES data, please cite the following: Polk, Jonathan, Jan Rovny, Ryan Bakker, Erica Edwards, Liesbet Hooghe, Seth Jolly, Jelle Koedam, Filip Kostelka, Gary Marks, Gijs Schumacher, Marco Steenbergen, Milada Vachudova and Marko Zilovic. 2017. "Explaining the salience of anti-elitism and reducing political corruption for political parties in Europe with the 2014 Chapel Hill Expert Survey data," Research & Politics (January-March): 1-9. CHES codebooks are available here: https://www.chesdata.eu/2014-chapel-hill-expert-survey (CHES 2014) https://www.chesdata.eu/1999-2014-chapel-hill-expert-survey-ches-trend-file-1