"Read Naturally" is a supplemental reading program designed to improve reading fluency, accuracy, and comprehension of elementary and middle school students using a combination of books, audio CDs, and computer software. The program combines three main strategies: modeling of story reading, repeated reading of text for developing oral reading fluency, and systematic monitoring of student progress by teachers and the students themselves. Students work at a reading level appropriate for their achievement level, progress through the program at their own rate, and work (for the most part) on an independent basis. The program has two versions: one in which students use audio CDs with hard-copy reading materials, and one in which students use the "Read Naturally" computer program alone. The What Works Clearinghouse (WWC) identified 56 studies that investigated the effects of "Read Naturally" on the literacy skills of adolescent readers. The WWC reviewed four of those studies against group design evidence standards. One study (Heistad, 2008) is a quasi-experimental design that meets WWC evidence standards with reservations. The study is summarized in this report. Three studies do not meet WWC evidence standards. The remaining 52 studies do not meet WWC eligibility screens for review in this topic area. Appended are: (1) Research details for Heistad (2008); (2) Outcome measure for the general literacy achievement domain; (3) Findings included in the rating for the general literacy achievement domain; and (4) Description of supplemental findings for the general literacy achievement domain. A glossary of terms is included. (Contains 3 tables and 4 endnotes.)