The NAICS code has 4 principles that it must adhere to when considering changes submitted on behalf of the establishments.
Principle 1
NAICS is erected on a production-oriented conceptual framework. This means that producing units that use the same or similar production processes are grouped together in NAICS.
Principle 2
NAICE gives special attention to developing production-oriented classifications for (a) new and emerging industries, (b) service industries in general, and (c) industries engaged in the production of advanced technologies.
Principle 3
Time series continuity is maintained to the extent possible.
Principle 4
The system strives for compatibility with the two-digit level of the International Standard Industrial Classification of All Economic Activities (ISIC Rev. 4) of the United Nations