"ClassWide Peer Tutoring" ("CWPT") is a peer-assisted instructional strategy designed to be integrated with most existing reading curricula. This approach provides students with increased opportunities to practice reading skills by asking questions and receiving immediate feedback from a peer tutor. Pairs of students take turns tutoring each other to reinforce concepts and skills initially taught by the teacher. The teacher creates age-appropriate peer teaching materials for the peer tutors; these materials take into account tutees' language skills and disabilities. Although "CWPT" can be used in subject areas other than reading, this report focuses on "CWPT" for beginning reading for elementary school grade levels, which emphasizes reading fluency and comprehension skills. The What Works Clearinghouse (WWC) reviewed 12 studies on "CWPT." One study of "CWPT" met the WWC evidence standards. The study included more than 200 students from six urban elementary schools in Kansas. Based on this one study, the WWC found potentially positive effects on general reading achievement. (Contains 14 footnotes.) [The following study is reviewed in this intervention report: Greenwood, C. R., Terry, B., Utley, C. A., Montagna, D., and Walker, D. (1993). Achievement placement and services: Middle school benefits of ClassWide Peer Tutoring used at the elementary school. "School Psychology Review," 22(3), 497-516.]