“The quality of summary notes found in online bibliographic records varies greatly …” An understatement, that quote from the Introduction! This document from OLAC is a good orientation to the principles of creating and revising summary notes. Though prepared with AV materials in mind, it’s also useful for summaries for children’s books.

Summary Notes for Catalog Records (OLAC Cataloging Policy Committee, Summary/Abstracts Task Force, August 2002)

As with the other OLAC resources I’ve cited, the URL has changed since we prepared our handouts for our last Technical Services Tips & Tricks presentation; so if you derived a bookmark from those, you should update it.