Researchers reviewed 20 articles on peer tutoring research in secondary settings and addressed demographics of tutors and tutees, content areas in which peer tutors were employed, tutor training required for implementing effective tutoring programs, and the effects of peer tutoring on tutee performance. Generally, peer tutoring in secondary settings results in improved academic performance of students with mild disabilities and could be classified as an evidence-based practice. It appears that training tutors on how to implement instruction produces a large effect on tutee outcomes. Additional research is needed, however, to explore several factors regarding peer tutoring in general education classes and with secondary students with culturally diverse backgrounds. (Contains 9 tables.)