Each ESCO occupation is therefore mapped to only one ISCO unit group.
It follows from this structure, that ESCO occupation concepts can be equal to or narrower than ISCO unit groups, but not broader.
The revision of SOC2000 has required additional work to rebase the NS-SEC on SOC2010.
Back to table of contents The Standard Occupational Classification, first introduced in 1990, is maintained by the Classification and Harmonisation Unit (CHU) of the Office for National Statistics (ONS).
The table shows the ISCO occupation codes up to the most detailed level (4 digits) in four languages.
More information can be found on the International Labour Organization (ILO) website.
The CHU also has longer-term responsibilities to prepare and publish revisions to the classification index and the structure of the classification.
Volume 3 details the relationship between SOC2010 and the National Statistics Socio-economic Classification (NS-SEC).
This classification of socio-economic positions is based in part on the Standard Occupational Classification.
The International Standard Classification of Occupations (ISCO) is an International Labour Organization (ILO) classification structure for organizing information on labour and jobs.
It is part of the international family of economic and social classifications of the United Nations.