The ISO 9000 family is primarily concerned with "quality management". This means what the organization does to fulfil: - the customer's quality requirements, and - applicable regulatory requirements, while aiming to - enhance customer satisfaction, and - achieve continual improvement of its performance in pursuit of these objectives. (
http://www.iso.org/iso/en/iso9000-14000/index.html
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The North American Industry Classification System (NAICS) has replaced the U.S. Standard Industrial Classification (SIC) system. NAICS will reshape the way we view our changing economy. NAICS was developed jointly by the U.S., Canada, and Mexico to provide new comparability in statistics about business activity across North America.