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The IBM Style Guide: Conventions for Writers and Editors by Eric Radzinski, Leslie McDonald, Amy Laird, Jana Jenkins, Peter Hayward, Francis DeRespinis

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Chapter 10. Indexes

An index is an alphabetical list that provides multiple entry points to information. In addition to being a primary retrievability aid in online information, books, and PDF files, a good index can improve search results within an information center. Nevertheless, because an index reflects an analysis of the relationships among topics, it is more discriminating than search; an index can help users locate a specific piece of information faster than a long list of search results can.

Levels of index entries

An index entry can have up to three levels. The following example shows the notation that is used to refer to the levels:

Locators lead users from index entries to the location of information. In information centers and other ...

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