Неполный международный стандарт кодирования языковых семей

Incomplete international standard for the codification of language families
ISO 639 5:2008 "Codes for the representation of names of languages—Part 5: Alpha 3 code for language families and groups" is a highly incomplete international standard published by the International Organization for Standardization (ISO). It was developed by ISO Technical Committee 37, Subcommittee 2, and first published on May 15, 2008. It is part of the ISO 639 series of standards.

ISO 639 5 defines alpha 3 (3 letter) codes, called "collective codes", that identify language families and groups. As of the February 11, 2013 update to ISO 639 5, the standard defines 115 collective codes. The United States Library of Congress maintains the list of Alpha 3 codes that comprise ISO 639 5. The standard does not cover all language families used by linguists. The languages covered by a group code need not be linguistically related, but may have a geographic relation, or category relation (such as Creoles).

The committee draft of ISO 639 5 was issued on February 23, 2005. Voting on the draft terminated on July 5, 2005; the draft was approved. In 2006, the target publication date for the final standard was set at October 30, 2007. During the approval stage for the standard, the ISO final draft international standard ballot was not initiated until February 8, 2008. Voting ended on April 10, 2008 ("stage 50.60"). The standard was published on May 15, 2008. Updates were made in August 2008, February 2009, and February 2013.

The ISO 639 5 code set represents a very tiny proportion of the language families and groups of the world. A more complete attempt at coding was ISO 639 6 (withdrawn in 2014).