Six Steps to Producing an Index
http://www.stc.org/confproceed/1996/PDFs/PG477479.PDF

Winsberg, Freya Y.
STC Proceedings
1996

Abstract:

If something does not appear in the index, it might as well not be in the book because the reader may never find it. Writing a complete index takes time and patience. Writing an index that is consistent and effective requires refinement and common sense. Here are six steps that will get you through the process.