class sections were from 1.3 to 2.7 timeslarger, which would be expected to work to the advantage of the traditionally-taught classes.While more study is needed to firmly establish the quantitative effects of active learning in theintroductory chemical engineering course, the results provide strong motivation for criticalexamination of the pedagogy in gateway courses, particularly with regard to its impact onstudent performance and retention. Page 13.473.7References1. L.G. Bullard and R.M. Felder, “A Student-Centered Approach to Teaching Material and Energy Balances. 1. Course Design.” Chem. Engr. Education, 41(2), 93–100 (2007), ; 2