,Major Groups,,Medium Groups
A,Professional and technical worker,A-1,Engineers and technicians
,,A-2,Public health and medical workers
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,,A-3,Social and welfare workers
,,A-4,Professors and teachers
,,A-5,Other professional alld technical workers
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B,Managers and officials,B,Managers and officials
C,Clerical and related workers,C,Clerical and related workers
D,Sales workers ,D-1,Sales workers of commodities
,,D-2,Sales related workers
E,Service workers,E-1,Domestic and personal service workers
,,E-2,Food and beverages preparing workers
,,E-3,Serving workers 
,,E-4,Other service workers
F,Protective service workers ,F,Protective service workers
G,"Agricultural, forestry and fisheries workers",G,Agricultural, forestry and fisheries workers
H,Workers in transport and communications occupations,H,Workers in transport and communications occupations
I,"Craftsmen, mining, production process and construction workers and laborers",I-1,Mining workers
,,I-2,"Ceramic, clay and stone products, metal material and chemical products workers"
,,I-3,Metal products and machinery workers
,,I-4,"Food, textile, wood, paper, rubber and leather produJ workers.and printing and book-binding workers"
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,,I-5,Other craftsmen and production process workers
,,I-6,"Stationary engine and construction machinery operators and electrical workers"
,,I-7,Construction workers
,,I-8,Laborers
J,Workers not classifiable by occupation ,,