Regular users of NAICS codes might find the information here occasionally useful for their own use. Where I think it shines is as a point of reference for less regular users. For instance:
How do the NAICS codes affect federal procurement and regulatory activities, such as those carried out by the Environmental Protection Agency, the Occupational Safety and Health Administration (OSHA), the Department of Defense, and the General Services Administration?
NAICS was developed for use in the collection, tabulation, presentation, and analysis of statistical data that show the economic status of the United States. The NAICS categories and definitions were not developed to meet the needs of procurement or regulatory applications. However, other Federal agencies, trade associations, and regulation boards have adopted NAICS to use for procurement and regulatory purposes even though it is not well suited to meet their specific needs. The U.S. Census Bureau has no formal role as an arbitrator of classification decisions outside of Census Bureau programs. For questions regarding other agencies' uses of the NAICS system, contact the specific agency. For access to a list of Federal government agencies, visit www.usa.gov/Agencies/Federal/All_Agencies/index.shtml.