This section contains both classifications for international comparative research (e.g. NACE) and classifications mapping administrative classifications (e.g. Eurostat's definition of knowledge- and technology-intensive industries based on NACE).
The different classifications of economic sectors are related to each other. For example, ISIC Rev.4 and WZ 2008 are identical up to the second digit. The latter in turn is a updated version of the WZ 2003. These relationships between the classifications are shown under 'Related classifications'.