06/08/2025
Twenty-one SI members, from students to Fellows, gathered online this morning for our monthly Talking about the Past online meeting. Today's topic was passing mentions, a perennial problem in indexers. How do we decide what to leave out, and what to include?
Members discussed how we weigh up the context of the whole book, the needs of the reader - including the returning reader - and the intention of the author when deciding whether a mention might be passing. There's significant ethical responsibility in making sure a book is properly represented in the index, and it relies not only on analysis and precision but also empathy and intuition. It can seem more generous to include as much as possible, but you risk a cluttered index - cutting the clutter can make the book more accessible.
Some of us are kitchen-sink indexers, adding everything and cutting back at the end; others prefer to be selective from the start. We talked about systems for flagging potential passing mentions - most indexing software facilitates this - so we can identify entries that might need review. Criteria to apply include relation to the metatopic and the amount of coverage in the text, and these can be adjusted in relation to the space available for the index.
Indexing examples, and material in tables, was also discussed. Examples are often not indexed, but they may have specific, relevant information that is useful to index. Tables may be routinely indexed in some types of text - if that's the only place a drug is mentioned in a medical textbook, it will be indexed - but others may be more like examples and not necessarily indexable.
Thanks as usual to Ann Hudson for leading our discussion and to all who participated. For more on passing mentions, see our SI blog post:
One of the most frequent queries indexers get from clients is “Why is this term not in the index?” In this post, indexer Tanya Izzard explains what passing mentions are, why we sometimes leave them out, and how we make that decision. Definitions Passing mentions (sometimes called passing referen...