1. Demand by industry for codes for more languages 2. Need for less ambiguity and overlap 3. Need for linguistic rather than bibliographic orientation 4. Machine Readable Cataloging (MARC 21) 5. ISO 639-1 and ISO 639-2 6. Most commonly used system among linguists was The Ethnologue 7. Need for consistency.
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机译：1.由行业的需求进行代码，用于更多语言2.需要较少的歧义和重叠。需要语言而不是书目指向4.机器可读编目（Marc 21）5. ISO 639-1和ISO 639-2 6.最多语言学家之间的常用系统是民族理论7.需要一致性。
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