on Jane Friedman site:

You may have been contemplating writing a nonfiction book for years, or perhaps the idea only recently showed up on your dream map.

Once you’ve determined that there is a gap in the bookshelf on a particular topic that your knowledge and expertise can fill, your next step is to prepare a book proposal.

A proposal is often necessary to present your idea to literary agents and publishers, but in our many years helping authors create their proposals, we have found that the process offers some important side benefits as well.

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