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According to UNIMARC: An Introduction, a document of the Universal Bibliographic Control and International MARC Core Programme, MARC is "a short and convenient term for assigning labels to each part of a catalogue record so that it can be handled by computers.
In the mid-1980s it was considered necessary to expand UNIMARC to cover documents other than monographs and serials, so a new description of the format the UNIMARC Manual -was produced in 1987. By this time UNIMARC had been adopted by several bibliographic agencies as their in-house format. But developments did not stop there.
The Permanent UNIMARC Committee, charged with regularly supervising the development of the format, came into being that year, as users realized that continuous maintenance not just the occasional rewriting of manuals was needed. In maintaining the format, care is taken to make changes upwardly compatible.
The user would still see the name in the bibliographic record, however, as the computer could import it from the authorities file at a convenient time. So in 1991 UNIMARC/Authorities was published."
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