Interleaving Helps Students Distinguish among Similar Concepts
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When students encounter a set of concepts (or terms or principles) that are similar in some way, they often confuse one with another. For instance, they might mistake one word for another word with a similar spelling (e.g., allusion instead of illusion) or choose the wrong strategy for a mathematics problem because it resembles a different kind of problem. By one proposition explored in this review, these kinds of errors occur more frequently when all exposures to one of the concepts are grouped together. For instance, in most middle school science texts, the questions in each assignment are devoted to the same concept, and this blocking of exposures ensures that students need not learn to distinguish between two similar concepts. In an alternative approach described in this review, exposures to each concept are interleaved with exposures to other concepts, so that a question on one concept is followed by a question on a different concept. In a number of experiments that have compared interleaving and blocking, interleaving produced better scores on final tests of learning. The evidence is limited, though, and ecologically valid studies are needed. Still, a prudent reading of the data suggests that at least a portion of the exposures should be interleaved.
KeywordsInterleave Blocked Spacing Math Learning
I thank Pooja Agarwal and one anonymous reviewer for their comments on an earlier version of this review. This work was supported by the Institute of Education Sciences, U.S. Department of Education, through Grant R305A110517 to the University of South Florida (PI: D. Rohrer). The opinions expressed are those of the author and do not represent views of the Institute or the U.S. Department of Education.
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