“…The study of occupation has a long tradition in Sociology and Economics, and occupation serves as a core concept in research on wage determination, human capital acquisition, careers, social stratification and social mobility, and other fields such as social and friendship networks or cultural consumption (Blau & Duncan, 1967;Chan & Goldthorpe, 2007;De Beyer & Knight, 1989;Kambourov & Manovskii, 2008;Perales, 2013; entities which emerge, evolve, disappear and reappear with changes in the structure of work (Abbott, 1989;Sobek, 1996). As a consequence, classifications often become obsolete and are superseded by new versions or completely new instruments.…”