A new study investigates whether teaching practices differ in effectiveness depending on the students in the class. It finds that the impact of good classroom management and student-centered instruction vary depending on whether the students in the classroom are of high ability or of mixed ability. Jane Cooley Fruehwirth, Associate Professor in the Department of Economics at the University of North Carolina, sits down with Paul E. Peterson to discuss the study,”Teacher Effectiveness and Classroom Composition,” which she co-authored with Esteban Aucejo, Patrick Coate and Zachary Mozenter.