Learning.
Retrieval, spacing and the reason good study methods feel unproductive.
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The most effective study and training methods reliably feel worse than the ineffective ones. That single fact explains most of the gap between how people learn and how they think they learn.
What this field actually measures
- Testing effect
Retrieval practice compared with re-reading or re-watching.
ReferenceRetrieval produces substantially better long-term retention across hundreds of studies.
- Spacing effect
Distributing practice across time rather than massing it.
ReferenceSpaced schedules outperform massed ones at delayed tests, with the advantage growing as the delay grows.
- Judgement of learning
A learner's own prediction of what they will remember.
ReferenceSystematically overestimates retention after fluent, massed study.
Evidence & metrics
The published work behind the numbers above, and the public datasets you can open to check us. If a claim can’t be traced here, we don’t print it.
Citations
Improving students' learning with effective learning techniques
Dunlosky, Rawson, Marsh, Nathan & Willingham — Psychological Science in the Public Interest · 2013
Retrieval practice and distributed practice rated high utility; rereading and highlighting rated low.
The critical importance of retrieval for learning
Karpicke & Roediger — Science · 2008
Repeated testing produced far better long-term retention than repeated studying of the same material.
Datasets
PSLC DataShop learning datasets
Carnegie Mellon University · free registration
Millions of student-tutor interaction records with learning-curve data.
US Department of Education, IES · free
Effect-size reviews of instructional interventions with quality ratings.
Still open
- What is the optimal spacing interval for motor versus declarative skill?
- How well do lab retention findings hold across a competitive season?
- Do learning-styles beliefs cause measurable harm, or merely waste time?
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We will not endorse learning styles. The matching hypothesis has failed every controlled test it has been given.
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