The NAICS (North American Industry Classification System) for categorizing business establishments by line of business. replaced older SIC system. This coding system is an integral part of the information chain for industry and company information. It is the heart of the U.S. Census Bureau's Economic Census information organization. The system is also used pervasively in market research databases, company directory databases, and also within business periodical index databases like ABI/INFORM and Business Source Complete. Become familiar with using it as a vital industry information link.