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Subject headings, descriptors and thesauri terms are examples of "controlled vocabularies." They are lists of pre-defined, carefully selected words and phrases used to classify and organize information, and vary with discipline and database. Controlled vocabulary describes the general content of an information unit, such as a book, an article, or an essay.

Use controlled vocabulary to browse related, broader and narrow topics of interest; in a search to get subject specific, targeted results; and to narrow search results or combine its use with keyword searching for more focused results.

Steps to Search & Browse MeSH & CINAHL Headings