Even where fully automated indexing is not an option, it is possible to assist the compilation of an index by mechanical means. Names and other factual entries can be tagged in the text and printed out in alphabetical order, to have their final page numbers added manually. The same technique can provide the basis for an index of subjects, although this will probably need manual re-working. However, authors proposing to help generate an index in this way are advised not to attempt it until after the manuscript is complete, and then on a copy of the text other than that which is to be sent to the publisher.