School Library Journal's 2007 Leadership Summit, "Where's the Evidence? Understanding the Impact of School Libraries," focused on the topic of evidence-based practice. Evidence-based school librarianship is a systematic approach that engages research-derived evidence, school librarian-observed evidence, and user-reported evidence in the processes of decision making, development, and continuous improvement to achieve the school's mission and goals. These goals typically center on student achievement and quality teaching and learning. This article, drawing upon the author's closing session, defines core beliefs about evidence-based practice, identifies the challenges ahead, and determines the key actions that need to be taken.