M. van Leeuwen & I. Maas
Occupational titles are first coded into HISCO and then grouped in 12 social classes
based on skill level; wether they are manual or not; hierarchy and economic sector.
The regrouping is done on the basis of strict, formal criteria based on systematic job
descritions (with some documented exceptions as deemed necesssary by an
international team of testers consisting of scholars working in the field of occupational
titles in the past).
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