Occupation-categories are the “legal” or “standardized”
way of describing the job of an employee.
Companies often refer to a standardized categorization of occupations in order to determine management rules.
Examples may be:
P.C.S. (Profession et Catégories Professionnelles) in France ;
C.N.O. (Clasificación Nacional de Ocupaciones) in Spain ;
KldB 2010 (Klassifikation der Berufe 2010) in Germany ;
I.S.C.O. (International Standard Classification of Occupations) proposed by the International Labour Organization.
As such, occupation-categories are often used in jurisdiction-dependant contexts (i.e. collective bargaining agreements), like leave accrual management or minimum wages.