I think I understood most of what you've guided here. So I used a concordance document for the creation of Index entries, via References|Insert Index>Automark. And that step marked all the words; here by "marking" we mean that Microsoft Word inserts index entries as an XE (Index Entry) field in a field code. Am I correct in understanding that at this point the XE fields have been created and I could search them and do a Find and Replace as you indicated, so that all the listings (Book, Books, book, books) would be seen by MSW as "Book", so that when I then create the index, it shows only Book for all four words. If I've properly understood, then my question is: Where do I find that document which has been created by MSW which holds all the Index entries marked by the automark process? That is the document in which I need to do the Find/Replace, right?