The field of school librarianship has long called for stronger evidence related to school libraries and student achievement (Stefl-Mabry and Raddick 2017; Stefl-Mabry et al. 2016; Morris and Cahill 2017). This article outlines a systematic method for school librarians to document student learning and provide tangible confirmation of their practice--evidence of student learning. Well-written learning objectives make core capabilities visible to school librarians, students, parents, and administrators. Systematically documenting evidence of practice by using formative assessment provides tangible evidence of what and how school librarians contribute to student achievement.