Sociology courses, particularly introductory courses, with 200 or more students are increasingly being offered in U.S. colleges and universities. Within the "mass class" structure, teaching assistants are often utilized to instruct students in smaller discussion sessions. This creates unique conditions of instruction for both professors and teaching assistants. For instance, professors are faced with coordinating teaching assistants' activities, while teaching assistants need to develop skills relating to provoking discussion. Both must deal with effects of a hierarchy of instruction. After discussing these conditions we present structured classroom exercises that focus on sociological concepts typically presented in introductory courses to help teaching assistants create an engaging learning experience, attain teaching skills, and facilitate the professor's coordination of instruction.Introductory sociology courses; particularly at large public universities, are increasingly being taught in "mass classes," courses in which 200 or more students are enrolled (McGee 1991). Within the "mass class" structure, teaching assistants are frequently utilized to instruct students in smaller groups referred to as discussion sessions (Kain and Immels 1989). These teaching assistants are often graduate students with little or no teaching experience, who must nonetheless learn to effectively run discussion sections, sometimes immediately after entry into the graduate program (Chaichian et al. 1986;Garland 1983; Pescolido and Milkie 1995). While this trial by fire method provides an opportunity to acquire teaching skills, teaching assistants and their students would be better served by more systematic training in how to structure discussion sessions and teach sociological concepts (Garland 1983;Goodland 1997; Pescolido and Milkie 1995).In this article we discuss some of the structural limitations confronting teaching assistants and professors of mass classrooms. We bridge research that explains and describes the teaching conditions created by mass education with exercises that help teaching assistants provoke discussion and attain teaching skills, and provide professors a means of coordinating uniformity in teaching assistant instruction. We propose that instructors equipped with a well-thought-out series of teaching exercises before the beginning of a semester may help in the training of Marina Karides is at the University of Georgia. Joya Misra is at the University of Massachusetts.