Tip of the month from PRC  
April 1997 
Index and table of contents in manuals


Issued 2 April 1997 


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Tip of the month is edited by Peter Ring, PRC (Peter Ring Consultants, Denmark)
- consultants on how to write user-friendly manuals

The purpose of an index

A good index is a must if the manual is more than approx. 8 pages. In fact it is often more important than a table of contents for small manuals. Bear in mind, that there are two ways of using a manual:
  1. Read it from start to end of in order to learn how to use the product before you start using it. This is done by 10-20% of the manual users, depending of the product and its complexity.
  2. Look for the solution(s) to a problem with the product when using it. This is done by the remaining 80-90% of the users! In this case the user will either
  3. The only exception I know of is computer programming language manuals, where you approximately know the name of the order which are listed alphabetically. Here, the alphabetical list of orders can be considered a sort of second index in itself.

The purpose of a table of contents (TOC)

Many authors believe, that their readers look in the TOC to find a given subject. Of course some do, but most readers prefer the much better solution: the index - if it exists. In most cases the TOC is used to give the reader a survey over the structure of the manual.

By a suitable grouping of the sections, and a good selection of section headers, the TOC in a small manual with max. approx. 20-30 headings may serve as a primitive index, too. The reason is, that browsing through 20-30 lines is for most reading people a relatively small effort.

Above approx. 30 pages, both an index and a TOC is needed. If possible (and permitted) I put them on the same page instead of the traditional layout: TOC at the beginning and the index at the end of the book. That gives the reader a very practical two-in-one tool for finding what (s)he is looking for.


Indexing is a profession

Indexing is a profession, in the USA covered by the "American Society of Indexers". Their publications include "Freelancers on Starting and Maintaining an Indexing Business", "Generic Markup of Electronic Index Manuscripts", "A Guide to Indexing Software", "Indexing: A Basic Reading List", "Indexing Biographies and Other Stories of Human Lives", and "Indexing from A To Z".

Literature about indexing for technical writers

The following literature list is compiled from John Renish's booklist for technical writers, and from an abstract of the responses to a question to TECHWR-L by Nate Rush - Director of Documentation Karmak, Inc. Carlinville, Illinois

If you disagree with these ideas - or have other relevant points, experiences, or ideas +/-, please e-mail me !
Ideas for new "Tip of the month" subjects are very welcome, too!


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