The purpose of this study was to investigate the effects of school counselor supervised peer tutoring intervention on meeting IEP outcomes of six inclusion students with developmental disabilities in a public elementary and secondary school. The effectiveness of this intervention was evaluated by using multiple probe design across students. Elementary school students (3rd graders) were taught purchasing skill at school canteen and the secondary level students (7th and 8th graders) were taught first-aid skill. Three typical peers served as tutors for each student. The results showed that the school counselor successfully supervised peer tutoring intervention, the tutor reliably delivered intervention to their peers with developmental disabilities, and tutees acquired, maintained and generalized the skills on their IEPs. In addition, tutees reported positive opinions regarding the social validity of the study. Results, future research, and implications for practice are discussed.