This protocol guides the review of research that informs the What Works Clearinghouse (WWC) intervention reports in the Supportive Learning Environment topic area. The protocol is used in conjunction with the "WWC Procedures and Standards Handbooks (Version 4.0)." This review focuses on interventions designed to promote supportive learning environments in grades K-12, and will examine the effects of these interventions on schools, staff, and students. Interventions reviewed under this protocol will alter physical, relational, or instructional elements of an educational environment. Physical elements of an environment might include security technology or posters that promote appropriate behavior. Relational and instructional elements might include altering discipline policies and instructional strategies. Changes to these elements of a school's environment may improve the perceived sense of trust between students and staff, provide additional emotional support at the school, change disciplinary practices used by school staff, or affect other aspects of school climate. Of particular interest to this review are interventions designed to improve student behavior or responses to problem behavior, including for students with emotional disturbance or other behavioral risks. To provide WWC users with specific information about an intervention's effectiveness for such students, this review will produce separate reports that present findings for (1) students in this at-risk group and (2) all students.