Sometimes indexers use ordering systems that are neither numerical nor alphabetical. This post discusses two examples of different arrangements: the book order of a Scripture index, and the use of themes in biographical indexing.
Commissioning a professional indexer to index your publication can save you time and stress, and ensure that your readers will gain the best possible route map to your content.
Indexing is a specialist skill and it takes a significant amount of time to prepare an index well. It is an analytical process, not a keyword search, and it cannot be adequately replicated by computer software.