Administrators, policy makers, legislators, and the public demand concrete, measurable evidence of the need for libraries and their use. The collection and dissemination of data about library service in a straightforward, convincing manner are integral components of library advocacy in the current economic climate. Addressing frontline librarians lobbying for increased programming or staff, as well as adminstrators marshalling statistics to stem the tide of budget cuts and prevent library closure, this vital new book explores the whys and hows of using data to build a better picture of library needs and success. With a distinctive combination of research-based information and practical application, Dando *Demonstrates how data from surveys, focus groups, ALA, and state and local sources can be aggregated and used to craft a strong message *Takes readers step by step through the process of using data to tailor a message to specific audiences *Offers real-world examples from school and public libraries that can be used as models Addressing the requirements of a variety of stakeholders, this concise resource lays out an easy-to-follow, systematic way of inspiring action through clear, compelling data.