Mastery Learning - Achievement, Retention

"The mastery learning students achieved at twice the level of non-mastery students in terms of percent correct on daily chapter tests, an effect size of more than 3.0. However, mastery learning students spent more than twice as much time learning the same material. On a retention test taken four days after the last lesson, mastery students retained more than non-mastery students...However, non-mastery students retained far more per hour of instruction than did mastery learning students...". ,

Source: "Mastery Learning Reconsidered", Robert E. Slavin, Center for Research on Elementary and Middle Schools, Johns Hopkins University, 1987, p. 8.
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