Great Indexes
http://www.allegrotechindexing.com/news012.htm

Brown, Fred
Allegro Time!
2001

Abstract:

The American Society of Indexers identifies criteria for measuring a great index. An index is not an inverted table of contents, nor is it a simple listing of where certain terms appear in a document. An index consists of a 'compiled list of topics covered in the work, prepared with the reader’s needs in mind.'