Practice classifying before solving
Explicitly ask "what kind of problem is this?" before reaching for a method.
Why it works
Because interleaving’s payoff is learning to select the right approach, you can target that skill directly: forcing a classification step trains the discrimination that blocked practice never exercises. Naming the type out loud also recruits retrieval and self-explanation, both of which deepen encoding.
How to do it
- For each mixed problem, first state its type and why before solving.
- If you misclassify, note the cue that misled you for next time.
- Occasionally do a "classify only" pass where you sort problems without solving them.
Evidence
Research on inductive and category learning shows that interleaving improves learners’ ability to categorize new instances, indicating the gain is in selection/discrimination rather than in executing any single procedure. (rct)
Strong evidence for the discrimination benefit; the specific "classify-out-loud" drill is a sensible operationalization rather than a separately validated protocol.
Common mistake
Jumping straight to the procedure you used last time because it is fresh, which skips the very decision interleaving is meant to train.
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More practices for Interleaving: Mix It Up to Learn It Better
- Convert blocked practice into interleaved practice
Instead of doing all of topic A then all of topic B, shuffle A, B, and C together.
- Interleave related skills, not random subjects
Mix things you might confuse with each other — not unrelated subjects thrown together.
- Trust the harder-feeling session
Expect interleaving to feel worse in the moment — and judge it by later recall, not present ease.
- Combine interleaving with spacing
Spread interleaved sessions across days so mixing and forgetting both do their work.
- Interleave your review, not just your first pass
Review old topics mixed in with new ones instead of reviewing each unit in isolation.