A classwide peer tutoring program in reading, implemented at 12 elementary and middle schools in three contiguous districts in the middle of a southern state, was evaluated for its effectiveness with three learner types: low achievers with disabilities, low achievers without disabilities, and learners of average achievement. Twenty teachers implemented the Peer Assisted Learning Strategies (PALS) program for 15 weeks, and 20 teachers who did not implement it served as controls. The PALS program involves having pairs of students engage in three strategic reading activities: partner reading with retell, paragraph summary, and prediction relay. In each of the 40 classrooms, data were collected systematically on three students representing the three learner types. Pre- and post-treatment reading achievement data were collected on three measures of the Comprehensive Reading Assessment Battery. Findings indicated that, irrespective of type of measure and type of learner, students in peer tutoring classrooms demonstrated greater reading progress than control students. (Contains approximately 120 references.) (DB)