The relationship between class size and student evaluation of university teaching quality was analyzed. Data from 2,915 university classrooms were collected in classes ranging from 1 to 234 students. Results strongly support conclusions that (a) there is a weak relationship between class size and student ratings of teaching quality, when both statistical significance and effect size are taken into account; and (b) the relationship is a nonlinear one, whose shape is basically determined by the range of class size and the number of different values selected. Theoretical, methodological, and practical implications are discussed.
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