Article
February 4, 2025
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by Stephen

Telling Readers What This Thing Is

In my last post I wrote about entries and arrays, which I described as the building blocks of an index. I defined an entry as “what this thing is + where to find it.” Today I’m going to expand on “what this thing is,” also known as main headings and subheadings.

The fundamental purpose of an index is to guide readers to the relevant information that the reader is searching for. To do that, the index needs to be clearly written, which begins with the first words that the reader sees. 

Main Headings

The main heading, also known simply as the heading, kicks off the entry. This is the first word or phrase that you see in an entry and array. It is typically a noun, and should be clear and concise. If a longer phrase is needed, the main heading should lead with the most important element. The main heading should also match how the term is used in the text, such as using the same spelling and capitalization. 

The heading should be reflective of both the text and the audience. Is the book discussing cars more generally or electric vehicles specifically? Or both? Will readers be reading this book to learn about the auto industry, new innovations, or specific brands and models? Or all of the above? To give another example, biblical characters such as Matthew, Silas, and Timothy probably don’t need a gloss clarifying their identity in a work of biblical studies to clarify their identities, but these names may be more unfamiliar to readers if they appear in other disciplines. 

Another consideration is whether or not to pluralize main headings. Should it be dog or dogs? Cantaloupe or cantaloupes? To start, be mindful of differences in nuance. Freedom is somewhat different from freedoms, for example. Otherwise, I tend to follow common usage. If a term is commonly pluralized, then I go ahead and make it plural in the index, which I think reads more naturally. 

To give a few examples of main headings:

Acts (biblical book)

Cleveland, Grover

electric vehicles

heat transfer

London (ON)

trade wars, retaliatory

Subheadings

For short arrays containing a handful of locators, a main heading is usually sufficient to specify what this thing is. But more specificity is often needed for topics with extensive discussion (usually when there are more than 6-10 locators) or if there are different aspects that readers would appreciate differentiated.

The subheading is placed after the main heading. Its purpose is to further clarify what this thing is. Because subheadings often differentiate references from one another, there are usually multiple subheadings per array.

Since the subheading is appended, there is more flexibility in how it can be phrased. Depending on the context, the subheading can be either a short word or phrase, or it can be longer and more descriptive.  In all cases, the relationship between the main heading and subheading should be clear. If possible, I try to also lead with the key word, which both affects how the subheadings are alphabetically sorted and, I think, makes it easier for readers to find the subheading as they scan the array. 

For example,

Acts (biblical book): authorship; within biblical canon; commentaries on; Paul within

Cleveland, Grover: first presidency; free-silver issue; legislative achievements; private life between presidential terms; second presidency

heat transfer: conduction; convection

Effective headings and subheadings connect readers to the text. Main headings are the point at which readers encounter the index, and readers should not need to guess what this thing is. The same is true for subheadings, if the reader decides to read further into the array. 

Tell the reader what they need to know. Be specific and concise. Do this, and your index will be well on its way to being excellent.

Article
May 24, 2023
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by Stephen

Index Profile: Tracing Complicated Relationships in Main Headings, in The Other Great Game

What can main headings be composed of?

Main headings, which kick off an entry or array, usually describe a single person or thing. It could be a name, or a government agency, or a physical object, or a concept. It is concrete and identifiable. Which is what we want in a main heading. Readers need to be able to clearly identify what it is they are searching for.

But sometimes the thing that we are trying to describe is complicated, and it is okay for the main heading to expand and help carry the weight of the text.

I ended up taking this approach for the index for The Other Great Game: The Opening of Korea and the Modern East Asia, by Sheila Miyoshi Jager (The Belknap Press of Harvard University Press, 2023). This is a delightful history, squarely within one of my favorite areas to index—East Asian studies—while also quite challenging in its scope and length, at about 570 indexable pages.

This book is about the colonial jockeying for power and control over Korea, with Korea ultimately becoming a protectorate of Japan. One of the challenging aspects was all of the intertwined relationships. Korea is a key player, of course. Japan is also involved, and wanting to be taken seriously as a great power. Russia also has its interests and influence. China is a waning influence, though still trying to exert itself. Though less involved, the other Western powers—US, Britain, Germany, France—all played a role as well.  Much of the book covers the diplomatic back-and-forth as all these powers try to figure out what to do with Korea (instead of respecting Korea’s independence). From an indexing standpoint, what is the best way to index all of these relationships?

Most of these relationships, say between Korea and Japan, or Japan and Russia, are too large to be contained within a subheading or two. These are relationships that span decades, and include wars, lengthy negotiations, and shifts in the balance of power. With so much material to cover, double-posting these relationships under each respective country would have led to enormous, unwieldy arrays.

The solution I landed on was to make the relationship itself the main heading. So, “Korean-Chinese relations,” “Korean-Japanese relations,” “Japanese-Russian relations,” etc… I still had arrays for each country, for subheadings specific to that country, but the bulk of the entries fell under these various arrays for these relationships. This meant that under Korea or Japan, for example, there are several arrays, which break down the discussions into manageable, yet still clearly defined, portions.

This also raised the question of which country to prioritize in the main heading. Should it be “Japanese-Russian relations” or “Russian-Japanese relations”? Because Korea and Japan were the two biggest actors, I decided to let them take the lead, so to speak,, with the Western countries generally being listed second.

These main headings also required a lot of cross-references from the other countries. As I mentioned, double-posting wasn’t a viable option due to the sheer number of entries. Better to pick a single array to place entries under, and then use cross-references to point readers in the right direction. For example, “Russian-Korean relations. See Korean-Russian relations.”

If you are interested in seeing all this in action, you can view the index here, on Amazon, using the Look Inside feature.

The number one goal for main headings is that they be clear. A confused reader is less likely to find what they are looking for. But while keeping clarity in mind, you can also play with main headings to better match the discussions in the book. Some subjects and relationships are more complicated, and a longer, multi-part main heading may be the clearest and best option.