There has been a recent upsurge of interest in exploring how choices of methods and timing of instruction affect the rate and persistence of learning. The authors review three lines of experimentation--all conducted using educationally relevant materials and time intervals--that call into question important aspects of common instructional…

Suggests that qualitative studies of how knowledge becomes organized and retrieved over long periods of time would be of great interest not only as a more naturalistic counterpart to the laboratory experiments on memory, but also for education generally. (Author/AM)