This GESIS Paper describes the implementation of the ESeG (European socioeconomic groups) Classifi-cation with anonymised microdata of the Adult Education Survey (AES) 2011. This classification is designed to measure socio-economic status at European level. ESeG is an update of the European Socio-Economic Classification (ESeC) initiated by Eurostat. The update became necessary due to the revision of the ISCO occupational classification in 2008. The ESeG classification aims to provide a har-monized and validated classification that can be implemented easily with data from European statis-tics and thus supports comparative research in Europe.