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Source: https://writers.stackexchange.com/a/32840
License name: CC BY-SA 3.0
License URL: https://creativecommons.org/licenses/by-sa/3.0/

In many books you'll see an author's note at the beginning (or sometimes end) in which the author thanks various people for their help -- beta readers, members of a writing circle, editors, advisors on particular subjects (historical periods, military protocol, xenobiology, whatever), family members who put up with the project taking over, and so on. These are called _acknowledgements_, and it's how you publicly thank people who significantly helped you but weren't actually co-authors.

It sounds like you have people you should acknowledge in this way, but not co-authors. A book takes hundreds or thousands of hours; even though you might have had lots of brainstorming sessions with friends, it probably doesn't add up to a significant share of that work. They aren't expecting to be listed as co-authors, but they'll probably be pleased to be publicly acknowledged.

I have co-authored one book.<sup>1</sup> My co-author and I spent many long hours going over content together, trading sections back and forth for critique, planning, reorganizing, reworking, and making decisions. We were full partners in the project and its decisions, and both our names went on the cover. If the people you're consulting don't have a similar level of ownership, they're not your co-authors.

<sup>1</sup> Actually, many more -- but most were works for hire that did not involve anybody being publicly named as authors.

Original score: 1