With the advent of No Child Left Behind, Adequate Yearly Progress, and school budget cuts, school librarians have had to become more data driven than ever before. Thinking in terms of student learning and achievement has brought about an interest in evidence-based practice (EBP). In this article, the authors discuss three steps to understanding the workings of EBP: (1) Know the research that demonstrates how school libraries affect learning, (2) Mesh this knowledge with wisdom to build student learning, and (3) Work with the school library to collect evidence that shows one made a difference.