ANDS has published an introductory (awareness-level) guide that explains what vocabularies are and how they can support research. There is also a very brief section about vocabulary services.
This guide explains some of the basic concepts behind vocabularies in a way that is intended to be accessible to those without much background in this area.
This guide is not about vocabulary services or technology, but is more about building understanding of why vocabularies are useful.
The guide is available from http://ands.org.au/guides/vocabularies.html
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