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Skill level: Only a few broad "skill level" categories can usefully be identified for international comparisons. The 1976 version of the International Standard Classification of Education (ISCED) was used to define the ISCO-88 skill levels, but these definitions can easily be re-formulated with reference to the revised ISCED-1997. This formulation of the definitions does not mean, however, that skills can only be obtained by formal education or training. Most skills may be, and often are, acquired through experience and through informal training, although formal training plays a larger role in some countries than in others and a larger role at the higher skill levels than at the lower. For the purpose of the ISCO-88 classification system, determining how a job should be classified is based on the nature of the skills that are required to carry out the tasks and duties of the job not the way these skills are acquired. Nor is it relevant that the job incumbent may have skills not demanded by the job.
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