Many clusters of potential buyers can be further divided into smaller segments, each with different reasons for buying and using the information in your book. Dividing your prospective customers into manageable segments will also help you pinpoint nontraditional markets for special sales and further increase your revenue.

    For example the "college market" can be divided into selling books to students, alumni, as a textbook, as supplementary reading, to chapters of the American Marketing Association, vocational schools, trade schools, private colleges, military academies, etc.