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- Vol 2 RE: Chapter 3
storage strengthretrieval strengthdesirable difficultieseffortful retrievalinterleaved practicelearning transferdelayed retentionJournal article Evidence summaryAt a glance
Bjork and Bjork revisit the history, theory, and classroom challenges of desirable difficulties.
Key ideas
Their distinction between storage strength and retrieval strength explains why information can become temporarily hard to access while remaining well learned, and why successful effortful retrieval can strengthen later access. Spacing, interleaving, variation, generation, and testing can induce processes that support durable and transferable learning even though they slow practice and reduce confidence. The authors stress that difficulty is not inherently beneficial: it must engage productive encoding or retrieval and must be achievable given the learner's knowledge and support. They also discuss motivation and the challenge of persuading learners to adopt strategies that feel worse in the moment.
Why it matters
For educators, the article recommends calibrating challenge, explaining its purpose, providing feedback, and judging learning through delayed retention and transfer rather than immediate fluency.
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Edition abbreviations
- TE
- Teacher Edition
- PE
- Practice Edition
- RE
- Research Edition
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