Once you have some idea of what might be negotiable in a book publishing contract, it is time to do some serious sleuthing. Negotiations are ultimately influenced by which side knows the most about the other side’s positions. The editor starts this contest with an advantage gained from experience in the market, experience doing other similar deals (undoubtedly many more than you have done), and the benefits of your perspective as reflected in your proposal. The way you get on an even footing with your editor and publisher is by knowing what to ask, and just as importantly, when to ask it.