Although this is the largest and most comprehensive metaanalysis
of the undergraduate STEM education literature to
date, the weighted, grand mean effect size of 0.47 reported here
is almost identical to the weighted, grand-mean effect sizes of
0.50 and 0.51 published in earlier metaanalyses of how alternatives
to traditional lecturing impact undergraduate course
performance in subsets of STEM disciplines (11, 12). Thus, our
results are consistent with previous work by other investigators.