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The most detailed categories are defined by combinations of activities described in statistical units, considering the relative importance of the activities included in these classes.

ISIC Rev.4 continues to use criteria such as input, output and use of the products produced, but places additional emphasis on production processes.

Revision history

The United Nations Statistics Division has published the following revisions of the ISIC standard:
* Revision 1 - Published in 1958
* Revision 2 - Published in 1968

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