The data project includes the variables, the questions and the algorithms (in SPSS) required for the derivation of the full European Socio-economic Classification (ESeC). The name of the target variable derived is "euroesec". The European Socio-economic Classification (ESeC) is an occupationally based classification. The term ‘socio- economic classification’ (SEC) has no theoretical or analytic status whatever and so may be applied as a generic term for a variety of different measures designed to reflect how societies are stratified. Social stratification refers to social inequalities that may be attributed to the way a society is organised, to its socio-economic structure.