Nonprofit Taxonomy

In an essay not more than 500 words, describe the difference between the Nonprofit Taxonomy of Exempt Entities (NTEE) codes and the 29 different categories of Section 501 (c) of the Internal Revenue Code (IRC). Why do we need the NTEE Code if we already have the sector broken out into different exemption types in the IRC? What advantages are there to having both codes? Where can we find the NTEE code for an organization?