If you obtain a customer's four digit NAICS code, you should know that:

Question

Quizplus · Accepted Answer

A) NAICS codes are not specific to products that a firm manufactures, but rather the industry in which it operates. Therefore, firms with the same NAICS code can manufacture different products.
B) NAICS codes can have either four, five, or six digits depending on the level of specificity required.
C) NAICS codes are used to classify firms into industries, so many firms can have the same code if they operate in the same industry.
D) See explanation for B).

If You Obtain a Customer's Four Digit NAICS Code, You