The document provides tips on writing an effective book proposal for a new edition of an existing book. It discusses convincing the publisher that there is still a market for the book if revised, demonstrating how the author would appropriately revise the book to meet unmet needs and add unique value, and showing that the author has an expertise and reputation in their field that will generate interest in the new edition. It also notes that for a book the author has already written, the proposal must demonstrate strong expected sales, as publishing a new edition is a hard sell if previous sales were not profitable. The overall message is that the proposal must convince the publisher there is potential for profit from the new edition.