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Introduction
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Knowing how to carry out a method is different from knowing when to use it. A learner can solve a page of similar problems correctly because the page itself makes the method obvious. When several kinds of problem appear together, choosing the method becomes part of the task.
Interleaving means mixing related categories or problem types during practice rather than completing all examples of one type before moving to the next. It can help learners notice distinctions and practice selecting an approach.
This is not the same as switching constantly between unrelated activities. The mixture should serve a learning purpose, and the learner needs enough background to compare the cases meaningfully.