Industrial and Economic Activities Classification Codes: Websites

This site has a useful inventory of international economic and social classifications. Each scheme is referenced with a statement of its purpose and relationship with other international classifications. (Currently under revision)

Describes the development of the UK SIC scheme and its links to international classifications.

Useful general information on national/international standards and classification schemes used for ONS statistics

Explains the NAICS history and development, lists the 2002, 2007, 2012, 2017 and 2022 codes and correspondence between earlier versions and SIC