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Documenting, Maintaining, and Sharing Standard Variables with DDI Version 3.0: the ISCO example

Presenter 1
Joachim Wackerow
GESIS/ZUMA (Centre for Survey Research and Methodology)

Standard variables can be documented and maintained by the new DDI 3.0 in resources separate from an actual study. This approach enables efficient sharing of metadata in one organization or over several organizations. DDI 3.0 resources can form the basis for a variable registry, for persistent sources of metadata. The documentation structure of a variable in DDI 3.0 is related to the metadata registry standard ISO 11179. Using standard variables in DDI resources can facilitate comparison of collection of studies. The ISCO variable is used to illustrate these new possibilities of DDI. DDI Version 3.0 will be published in the first half of this year. The International Standard Classification of Occupation (ISCO) is a standard variable for organizing jobs into a clearly defined set of groups according to the tasks and duties undertaken in the job. The classification has four nested levels of codes representing the categories of occupations. ISCO is used in major studies like ISSP, GSS, ESS, and Eurobarometer. ISCO is developed by the International Labour Organization (ILO).

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