EVS covers a period spanning from 1981 to 2020 with a core questionnaire repeated over time surveyed representative samples of the resident adult population in each country. Over time, the EVS methodology has been strengthened to bring the data quality to a high level. Each national survey conforms to guidelines designed to ensure quality and consistency.
EVS data and documentation are available free of charge. They are stored at GESIS – Leibniz Institute for the Social Sciences in Cologne, Germany.