Since the introduction of ISO 639-3 in 2007, access to language information has increased tremendously. The code set initially adopted as ISO639-3:2007 was based on a harmonization of ISO 639-2 with the code set of SIL’s Ethnologue 15th edition and languages from Linguist List to form a comprehensive set of code elements for world languages.  SIL International, the Language Coding Agency for 639-3, relies on the contributions of linguists, language coding experts, and language users around the world to maintain and improve the code set through the change request process defined in the ISO 639 standard.

ISO 639 gives comprehensive provisions for the identification and assignment of language identifiers to individual languages, and for the creation of new language code elements or for the modification of existing ones (Terms of Reference of the ISO639/MA). 

This is the official site of the Language Coding Agency for ISO 639 Set 3.  Questions? Contact the Registrar at iso639-3.sil.org.