+++++++++++++++ Version 1.0.0 of the study is outdated and therefore only available in exceptional cases . Please use the revised version 3.0.0 here . +++++++++++++++ We carried out an harmonization of the Eurobarometer conducted between 2004 and 2021. This dataset includes 147 variables about aspects such as EU policies, attitudes towards Europe and the EU, identity, cognitive mobilization, political institutions, socio-political characteristics and partisanship. We propose: - a harmonized dataset ("EB_2004S-2021S_full.dta"), - a technical report ("User Guide Harmonized Eurobarometer 2004-2021"), - a summary of the original survey questions corresponding to the variables included in the dataset ("Questions EBs 1970-2021"), - one of the do-files used to carry out the harmonization (“EB 642 dofile” ), - one of the datasets used before merging all datasets (“EB 642 cleaned”).