Most agents have usually expressed that they want a finished book (for fictio) before they submit an idea to an acquiring editor. Lots of nonfiction, however, sells on the strength of an idea, but I still see a lot of variation among agents. Some want a partial firmly in place, some want an entire manuscript written, some actually prefer that the book not be written beyond a sample chapter. Others say to include in the proposal the strongest chapter of the book, implying that the book should be written. A bit confusing. Any ground rules or is it strictly agent preference? Thanks. ~Bob