This protocol guides the review of research that informs the recommendations contained in the What Works Clearinghouse (WWC) practice guide, "Teaching Secondary Students to Write Effectively." The review-specific protocol is used in conjunction with the "WWC Procedures and Standards Handbook (version 3.0)." The practice guide focuses on instructional strategies, interventions, and practices designed to improve writing skills with three types of texts: argumentative/persuasive, informational/explanatory, and narrative. This review protocol describes: (1) procedures for conducting the literature search; (2) eligibility criteria; and (3) evidence standards.