Field entry, published 2026-11-03T00:00:00.000Z, updated 2026-11-03T00:00:00.000Z. Group: Skill level and skill specialisation

How does ISCO-08 relate skill to education?

ISCO-08 relates skill to education through a mapping, published by the ILO, between its four skill levels and groups in ISCED-97, the International Standard Classification of Education. Skill level 4 maps to ISCED groups 5a and 6, level 3 maps to group 5b, level 2 maps to groups 2, 3 and 4, and level 1 maps to group 1. The mapping is presented as an operational aid for measuring skill level, alongside the nature of the work itself and the training or experience required for competent performance, not as a rule that a qualification creates a level.

ISCO-08 skill level	ISCED-97 groups in the ILO mapping
4	6, second stage of tertiary education leading to an advanced research qualification, and 5a, first stage of tertiary education at first degree level
3	5b, first stage of tertiary education of short or medium duration
2	4, post-secondary non-tertiary education; 3, upper secondary; 2, lower secondary
1	1, primary education

What is the mapping for?

The mapping exists so that statisticians can compare workforces across countries whose education systems differ. A degree, a diploma and a vocational certificate carry different names in different places, and ISCED-97 gives those qualifications a common language. By linking each skill level to one or more ISCED groups, ISCO-08 lets a statistical office ask a practical question: what level of formal education is normally associated with competent performance in this occupation, in terms that another country can recognise?

That purpose shapes how the mapping should be read. It describes a normal association, not a legal requirement. It helps a coder who is unsure about an occupation to check whether the usual education for that occupation is consistent with the level suggested by its tasks. If the tasks point to level 3 and the usual education is a short tertiary programme, the two considerations reinforce each other. If they point in different directions, the coder must look more closely at the tasks, because tasks are the anchor of the classification, and education is supporting evidence.

Where does informal learning fit?

Formal education is only one of the three operational considerations the ILO lists for measuring skill level. The other two are the nature of the work in relation to the characteristic tasks defined for each level, and the amount of informal on the job training or previous experience in a related occupation required for competent performance. Those two considerations are what allow ISCO-08 to recognise learning that never passed through a classroom.

This matters most at levels 2 and 3, where apprenticeships, supervised practice and progression through related occupations are common routes to competence. A worker may spend years building practical knowledge, learning to diagnose faults, handle varied cases and supervise others, without holding the qualification that the mapping associates with the level. ISCO-08 does not demote the occupation on that account, because the occupation is classified by what its tasks demand, and the worker has met that demand through experience. Conversely, a worker may hold a qualification above the mapped level and still work in an occupation at a lower level, because the tasks of that occupation are what they are.

Why is the mapping not a ladder of worth?

The mapping can look like a ladder, with primary education at the bottom and advanced research at the top, and it is tempting to read it as a judgement about the value of different kinds of learning. That reading is a mistake. The mapping records the length and type of formal education normally linked to tasks of a given complexity. It does not say that a research degree is more valuable than a craft apprenticeship, that lower secondary education is a failure, or that a country with more graduates has a better workforce.

It also does not freeze education systems in time. ISCED-97 is the version referenced by ISCO-08, and education systems have changed since it was published, with new qualifications, new routes and new names. A modern qualification that has no exact ISCED-97 label must be understood by its content and duration, not by its title alone, before it is compared with the mapping. Readers who keep that caution in mind will use the mapping as the ILO intended: as a bridge between two classifications, built to make statistics comparable, and not as a verdict on learning itself.

Sources checked

1. ILO ISCO-08

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