This rubric was developed in response to a request by Improving Literacy Research Alliance members at the Florida Department of Education to be used in their instructional materials review process. It is a tool for evaluating reading/language arts instructional and intervention materials in grades K–5 based on rigorous research and standards. It can be used by practitioners at the state, district, or school level or by university faculty involved in reviewing instructional materials. The rubric is organized by content area for grades K–2 and for grades 3–5. Each item is aligned to recommendations from six What Works Clearinghouse practice guides. Each content area (for example, writing) includes a list of criteria that describe what should be consistently found within the instructional materials. Reviewers use a 1-5 scale to rate the degree to which the criteria were met. The rubric includes a guide for when and how to use it, including facilitator responsibilities, professional learning for reviewers, and ways to use the scores. Alliance members and reading coaches involved in a statewide literacy initiative in Mississippi provided feedback on the rubric.