Indexing
Many manuscripts—especially those that are long or are technical in nature—will benefit from an index. Indexing is the responsibility of the author, and Chapter 19 of NHR contains extensive guidance on the subject. A good index is difficult and time-consuming to produce, and it may be beneficial to engage the services of a professional indexer.
If you would like to include an index in your work, you must inform the publisher at the start of the process, to ensure that sufficient time is built in to the production schedule. Whilst it is possible to make a list of relevant terms for the index after the manuscript has been edited, work should not begin on collating page numbers until the final typeset proof has been finalised and approved. If in doubt, ask the publisher.