Statistics Denmark's Socio-Economic Classification (SOCIO), v1:1997
For employees, the main division of the International Standard Classification of Occupations (ISCO-88) is applied, with emphasis placed on job-relevant skills.
https://www.dst.dk/en/Statistik/dokumentation/nomenklaturer/socio?id=030db73f-8bd7-42e6-8da0-9d0ee080e3d8