Indexes are pointers, arrows to information.

We use indexes, where these arrows (entries) are gathered into a searchable order, to quickly gain access to the allusions, concepts and subjects in the text.

No doubt you already know this. We often take indexes for granted because they inconspicuously sit at the back of the book, or appear as small 'A-Z search' links on some websites.

Can't 'word search' do this? A word search does not conceptually analyse and translate subjects, nor can it 'read into' what a potential reader is seeking. Indexers provide cross-references, synonyms, and phrasings that future readers find essential to access material.

Professionally written indexes increase value. Buyers - academics, consumers, librarians - check indexes for structure and elegance of navigation to weigh decisions on whether or not a book is worth purchasing.

For thorough information and FAQs about indexing, click on the American Society for Indexing (ASI) and Society of Indexers websites.