Identifying Key Questions for Book Themes

When identifying a subject matter or theme for a book, it's more compelling to focus on the questions it seeks to answer. For example, in the case of 'Our Body', the key question is 'What is the minimal effective dose for the 10 most important dimensions of physical fitness?' and for 'The Four Hour Chef', the question is 'How can I take someone from ground zero to super accelerated learner with any subject matter in eight weeks?' These questions can be applied to books or chapters to provide direction and clarity.