Collection
Make practice harder only when the difficulty teaches the right thing
Prevent learning design from confusing effort, disfluency or poor practice performance with durable learning; use desirable difficulty and interleaving only when the manipulation targets the process or discrimination the learner actually needs.
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2 heuristics
2 elements
Heuristic
Make difficulty earn its keep
Harder is useful only when the extra effort serves the learning process you actually need.
Read the idea HeuristicInterleave when the learner must discriminate, not by default
Interleaving is strongest when choosing the right rule is part of the skill.
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