“…Five studies (Eichler & Peeples, ; He, ; Lewis, ; Robert et al, ; Tien, Roth, & Kampmeier, ) used peer leaders or teaching assistants to facilitate interactions within large classes. Of the remaining three studies, two reported class sizes of approximately 100 students (Baepler et al, ; Casadonte, ) and the remaining study (Talanquer & Pollard, ) a class size of 250 students. Two (He, ; Talanquer & Pollard, ) of the eight studies make explicit mention of the challenges in implementation with a large class describing difficulties in ensuring student preparation, promoting student engagement and providing feedback on misconceptions.…”