MKTG 489: Marketing Management and Strategy

Many industry resources use the NAICS and SIC codes to organize their information. Most companies have primary and secondary classifications--pay attention to all of them. Sometimes a company's secondary industry classification will be more important to your project than their primary classification. 

North American Industry Classification (NAICS)
Created by the Census Bureau in 1997, NAICS replaced the SIC. Each industry is assigned a unique number is a code used to identify and describe North American (US, Canada, and Mexico) industures. It is hierarchical and classifies each industry by broad group and then subdivides each into smaller, more specific classifications.

Standard Industrial Classification (SIC)
SIC system used to describe the structure of American industries. A hierarchical system, industries are organized into broad industry groups and then subdivided into smaller groups. Each industry carries a unique four-digit classification code ranging from 0100 to 9999. The SIC was replaced in 1997 with the North American Industrial Classification System but many sources still use the SIC.