A reader opens a 350-page nonfiction book looking for one idea they remember from Chapter Six.
They do not remember the chapter title.
They do not remember the exact wording.
They remember the concept.
A good index helps them find it anyway.
Learning how to index a book is not simply learning how to collect important words and attach page numbers to them. A professional index anticipates what readers are likely to search for, organizes related ideas, and creates multiple sensible paths to useful information.
The American Society for Indexing describes an index as an intelligently constructed navigation tool, not an outline or a concordance. Its evaluation guidance emphasizes reader-appropriate terminology, useful main headings, subentries, cross-references, and accurate locators.
An index succeeds when readers find what they need without having to understand how the author originally organized the book.
A Table of Contents and an Index Answer Different Questions
The table of contents tells readers:
How is this book organized?
The index answers:
Where can I find information about this subject?
A table of contents might contain:
Chapter 1: Understanding Burnout
Chapter 2: The Modern Workplace
Chapter 3: Managing Energy
Chapter 4: Boundaries and Recovery
The index might contain:
burnout
early warning signs, 18–21
management culture and, 52–55
recovery from, 183–190
sleep disruption and, 112–114
The American Society for Indexing explains that a table of contents lists the book’s sections and their starting pages, while an index provides alphabetized access points to subjects, names, places, and other material discussed throughout the work.
A useful nonfiction book may need both.
Not Every Nonfiction Book Needs an Index
An index is especially valuable when readers are likely to consult the book selectively after reading it.
Common examples include:
- History
- Biography
- Business
- Academic books
- Professional handbooks
- Politics
- Science
- Religion
- Technical reference
- Health
- Legal or policy books
- Research-heavy nonfiction
A short inspirational book designed to be read once from beginning to end may gain little from a detailed subject index.
Ask:
- Will readers return to specific concepts?
- Are many people, organizations, or places discussed?
- Does the book contain terminology readers may search?
- Is it likely to be used for research, teaching, or professional reference?
- Would a reader reasonably expect an index in this category?
The decision should come from reader behavior, not simply from word count.
Index Concepts, Not Every Mentioned Word
Automated keyword collection is not the same as indexing.
Suppose a book mentions the word “leadership” on 64 pages.
An entry reading:
leadership, 4, 9, 12, 18, 22, 27, 31, 35, 41, 46, 51, 58, 63…
does little for the reader.
A professional indexer asks what the author is saying about leadership on those pages.
The result might be:
leadership
accountability in, 88–91
during organizational change, 142–147
emotional intelligence and, 55–58
remote teams and, 201–205
trust-building, 101–106
ASI’s current indexing guidance emphasizes distinguishing substantive discussions from passing mentions and identifying concepts readers are likely to seek, including concepts that may not appear as obvious keywords in the text.
The indexer’s task is analysis.
Main Entries Should Match the Reader’s Vocabulary
Main entries are the primary terms under which information appears.
Possible main entries include:
- People
- Places
- Organizations
- Events
- Concepts
- Processes
- Laws
- Diseases
- Technologies
- Products
Choose wording according to the intended reader.
ASI gives the example that a general-audience health book may use “heart attack,” while a professional medical book may appropriately use “myocardial infarction.”
Specialist vocabulary is not automatically better.
If readers are more likely to search “job burnout” than “occupational exhaustion,” the index should help them reach the material through the language they actually use.
Alternative wording can also be handled through double posting or cross-references.
Subentries Prevent Long Strings of Page Numbers
A major topic may appear throughout the book.
Instead of giving readers fifteen undifferentiated locators, divide the subject into meaningful subtopics.
For example:
artificial intelligence
copyright concerns, 214–218
education and, 161–166
employment effects, 97–103
healthcare applications, 186–190
privacy concerns, 226–230
ASI’s evaluation guidance suggests reconsidering main headings when they accumulate more than roughly five to seven locators and using subheadings to make heavily discussed topics easier to navigate.
The exact number is not a rigid law.
A reader should not have to visit twelve pages to discover which one discusses the aspect they need.
Locators Should Point to Useful Discussions
A locator is the reference attached to an index entry.
In print books, locators are usually page numbers or page ranges.
Examples:
remote work, 41–45
vaccination policy, 116, 121–124
Washington, George, 18, 22–24, 91
Do not index every appearance of a person’s name or term.
Imagine a biography mentioning “New York” 80 times. Some mentions may simply establish where someone boarded a train or attended dinner.
Index the pages where New York itself matters to the discussion if that is what readers would reasonably expect the entry to retrieve.
ASI specifically emphasizes substantive discussions over passing mentions and recommends checking locators for accuracy and sensible page ranges.
Page Ranges Should Reflect Continuous Discussion
Use a range when the relevant discussion continues across consecutive pages.
For example:
publishing contracts, 74–79
does not mean the phrase “publishing contracts” appears on every page.
It means the discussion beginning on page 74 meaningfully continues through page 79.
Avoid enormous ranges such as:
climate policy, 31–96
unless nearly the entire range genuinely addresses the concept at a useful level.
Long ranges often hide more useful subtopics.
Cross-References Create Alternative Routes
Readers do not always search using the author’s preferred term.
Cross-references solve this.
“See” References
A see reference redirects readers from an alternative term to the chosen main entry.
For example:
cell phones. See smartphones
Twain, Samuel Clemens. See Twain, Mark
ASI describes “see” references as a way to direct readers from one expression of a concept to the term used as the primary entry.
“See Also” References
A see also reference connects related subjects.
For example:
remote work, 142–156. See also hybrid work; workplace communication
The original entry already contains useful information. The cross-reference sends the reader toward additional related material.
Avoid circular references such as:
dogs. See canines
canines. See dogs
ASI’s current evaluation criteria specifically warn against circular cross-references and references that point to missing or differently worded entries.
Important Concepts May Need More Than One Access Point
Suppose the book discusses the cost of adopting a pet.
One reader may search:
adoption costs
Another may search:
pets, adoption costs
A professional index can provide access through both routes.
ASI refers to this as double posting and recommends multiple access points for significant concepts where appropriate.
Good indexing does not make readers guess the exact wording chosen by the indexer.
Personal Names Need Consistent Treatment
Names can become complicated when the manuscript includes:
- Titles
- Middle names
- Initials
- Pseudonyms
- Name changes
- Married names
- Historical spelling variants
- Royal titles
Choose a consistent form.
For example:
Angelou, Maya
King, Martin Luther, Jr.
Twain, Mark
A useful cross-reference might be:
Clemens, Samuel Langhorne. See Twain, Mark
The underlying editorial decisions should match the book editing style sheet so the manuscript, index, bibliography, captions, and other components use names consistently.
If the manuscript has undergone fact checking a nonfiction book, use the verified spelling and form instead of recreating names from memory during indexing.
Indexing Should Begin After Major Editorial Changes
Indexing too early creates unnecessary work.
A manuscript assessment belongs earlier when chapters may still be reorganized, deleted, or expanded.
A sensitivity reader for books should also complete any representation review that may change terminology, names, or substantial passages before final indexing.
Most traditional page-based indexing takes place after the book has been typeset and pagination is stable.
Why?
A reference to page 167 becomes useless if later layout changes move the discussion to page 174.
Indexing against near-final pages protects locator accuracy.
Large-Print Editions Need Their Own Page Locators
Pagination changes when:
- Font size increases
- Trim size changes
- Margins change
- Illustrations move
- Paragraphs reflow
A standard paperback might place a discussion on page 126 while the large-print version places it on page 192.
The subject structure of the index can often be retained, but the page locators need to match the specific edition.
The same principle applies whenever a new print format changes pagination.
Word Can Create Embedded Index Markers
Authors working directly in Microsoft Word can mark index entries using Word’s index-entry fields.
Microsoft’s current Word documentation allows users to create:
- Main entries
- Subentries
- Page ranges
- Cross-references
Word then collects the marked entries, alphabetizes them, attaches page numbers, and generates the index. When entries change, the index can be updated.
This is useful for books whose production workflow remains in Word for a significant period.
Still, software does not decide which concepts deserve indexing.
It records and generates decisions made by the human indexer.
InDesign Supports Indexing Inside the Final Layout
Adobe InDesign includes an Index panel for creating topic entries, subtopics, page references, ranges, and cross-references directly in the typeset document.
As of Adobe’s June 2, 2026 documentation, InDesign can compile those markers into an alphabetized index and regenerate the index when page references or entries change.
One important workflow rule is to edit the underlying index entries rather than manually correcting the generated index story. Adobe warns that manual edits to the generated index can be overwritten when the index is regenerated.
This feature is particularly useful when pagination is controlled in InDesign.
Dedicated Indexing Software Can Handle Complex Projects
Professional indexers may use specialized applications for:
- Entry creation
- Sorting
- Cross-references
- Locator management
- Editing
- Multiple indexes
- Embedded indexing
ASI’s professional training materials include both Microsoft Word and dedicated indexing software and teach main headings, subheadings, cross-references, locators, editing, and embedded indexing as separate indexing skills.
The best software depends on the publisher’s production workflow.
The software is the workspace.
The intellectual work remains deciding how readers should access the content.
Embedded Indexing Connects Entries to the Source File
Traditional indexing may be performed from final PDF pages, with the completed index returned as a separate document.
Embedded indexing places index markers inside the source document itself.
This can make later regeneration easier because the indexing information stays connected to the text as pagination changes.
Microsoft Word and Adobe InDesign both support forms of embedded indexing through index markers.
Embedded workflows become particularly useful when content will appear in multiple editions or digital formats.
An eBook Index Should Behave Like Digital Navigation
Print readers need page numbers.
Digital readers benefit from links.
Work done during accessible ebook formatting should ensure that an index exported into EPUB provides meaningful navigation rather than simply presenting dead print page numbers.
Adobe’s current InDesign guidance recommends creating indexes through the built-in index feature when exporting reflowable EPUB because this supports accessible index markup.
Digital indexing does not remove the need for thoughtful entries.
It changes how the locator works.
AI Should Not Be Treated as a Finished Indexer
As of July 2026, the American Society for Indexing explicitly advises that current generative AI systems do not produce adequate professional book indexes without substantial human remediation. Its recent testing identifies problems including missed concepts, unnecessary entries, inaccurate locators, and weak cross-referencing.
AI may help with brainstorming terminology or administrative work.
Do not assume an automatically generated alphabetical list is ready for publication.
Reader judgment remains central to indexing.
Sample Nonfiction Index
A short sample might look like this:
A
accessibility
digital editions, 214–219
large-print editions, 201–205
screen readers, 216–218
Amazon
author pages, 248
book descriptions, 241–243
metadata, 232–235
product pages, 239–245
B
book marketing
email campaigns, 263–267
reader reviews, 271–273
retail metadata and, 232–235
social platforms, 268–270
See also author platform
C
copyright, 87–101
images, 94–96
lyrics, 91–93
permissions, 97–101
quotations, 88–91
E
email marketing. See author platform, email list
The entries do more than repeat words.
They organize subjects into routes a reader could reasonably follow.
Indexing Quality-Control Checklist
Before approving the final index, confirm that:
- The terminology fits the intended reader.
- Important concepts have useful access points.
- Main entries are neither too broad nor excessively narrow.
- Long locator strings have been broken into useful subentries.
- Subentries describe meaningful distinctions.
- Names are spelled and alphabetized consistently.
- Significant synonyms are double posted or cross-referenced.
- “See” references point to valid preferred terms.
- “See also” references lead to genuinely related material.
- No cross-references are circular.
- Page ranges are accurate.
- Locators refer to substantive discussion.
- Final pagination has been used.
- Alphabetization is correct.
- Punctuation and capitalization are consistent.
- The index fits the publisher’s style requirements.
- Digital versions contain usable navigation.
- The index has been regenerated after final corrections.
- A representative sample of locators has been checked manually.
ASI’s evaluation criteria similarly emphasize reader appropriateness, accuracy, comprehensive access, effective subentries, useful cross-references, correct alphabetization, and consistent style.
The Index Also Supports the Book After Publication
A well-built index is primarily a reader tool, but its vocabulary can inform later publishing work.
An author media kit may use the index to identify recurring subjects suitable for interviews.
A book sell sheet can draw on the book’s strongest subject areas when explaining the title to bookstores and libraries.
Goodreads marketing for authors may use those same themes when discussing the book without inventing positioning that the manuscript does not support.
An author email list can also be segmented around topics readers repeatedly respond to.
Authors who turn podcast into a book often discover during indexing that recurring podcast themes were scattered across multiple chapters. The index can reconnect those ideas for readers.
Marketing tools such as Amazon A+ Content for books should still remain separate from the index itself. The index is not advertising copy.
Audio creates another distinction. An audiobook narrator audition should use representative prose, not index pages. Print indexes function as navigation systems and usually do not translate directly into useful spoken content.
A professional index does something quieter and more valuable.
It gives readers a map after the author has finished telling the story.
Frequently Asked Questions
What Is the Difference Between an Index and a Table of Contents?
A table of contents shows the book’s structural organization by chapter or section. An index provides alphabetical access to topics, names, concepts, and other information regardless of where they appear in the chapter structure.
When Should a Book Index Be Created?
A page-based print index is usually created after editing and typesetting are substantially complete and the page numbers are stable. Major changes made afterward can invalidate the locators.
Should Every Mention of a Word Be Indexed?
No. Professional indexing focuses on meaningful discussions and concepts that readers may want to retrieve. Passing mentions usually do not need entries.
What Is a Cross-Reference in an Index?
A cross-reference directs readers to another useful entry. “See” usually redirects an alternative term to the preferred heading, while “see also” connects readers with additional related material.
Can Microsoft Word or Adobe InDesign Create an Index?
Both programs provide tools for marking index entries and generating indexes. They automate sorting and locator generation, but a person still needs to choose meaningful concepts, subentries, and cross-references.
Can AI Generate a Professional Book Index?
Current AI systems can produce index-like text, but the American Society for Indexing’s 2026 guidance says present systems still show serious problems with completeness, navigation, cross-references, and locator accuracy. Human review and indexing expertise remain necessary.
