Peer-Assisted Learning Strategies (PALS) was implemented for supplementary reading classes in a Korean elementary school. The treatment group children were exposed to PALS during 20 min sessions, 4 times a week, for 8 weeks. The impacts of PALS were investigated in 3 aspects using a mixed-methods approach: improvement in reading attitudes, reading skills, and student perceptions of the intervention. Data collection includes reading attitude measures, standardized reading comprehension test scores, student satisfaction survey, student interviews, and student journals. The PALS group students showed significantly enhanced reading attitudes and reading skills. Consistently, qualitative data analysis also revealed affirmative influence of PALS on students' attitudes toward reading. Finally, the findings also suggested social benefits of PALS including developing cooperative skills and friendships.