Where it is used
Each entry identifies the volume, edition, chapter or appendix in which the work appears.
The evidence behind the series
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Browse the scientific research and professional literature used across all seven volumes of The Science of Learning for Educators.
7book volumes
8author ranges
1searchable library
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3 references
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- Vol 2 RE: Chapters 1, 3, App A, App C, App D
- Vol 4 RE: Chapters 4, 8, 21, 25, App A, App B, App C
- Vol 5 RE: Chapters 6, 7, App B
- Vol 5 TE: App C
desirable difficultiesspacing effectinterleaved practiceretrieval practicegeneration effecttransfer of learningdelayed retentionBook chapter Evidence summaryAt a glance
Bjork and Bjork explain why conditions that improve immediate performance can produce weak long-term learning, while conditions that introduce manageable difficulty can strengthen retention and transfer.
Key ideas
Desirable difficulties trigger encoding and retrieval processes that make memory more durable and flexible. Examples include spacing rather than massing practice, interleaving related categories or problem types, varying conditions of practice, and requiring generation or retrieval instead of repeated presentation. These methods often feel less fluent and produce more errors during acquisition, so learners and teachers may misjudge them as ineffective. The adjective desirable is essential: a challenge helps only when learners have enough prior knowledge and support to respond productively.
Why it matters
For educators, the chapter recommends evaluating methods with delayed, transferable performance and calibrating difficulty to the learner rather than equating smooth practice with lasting learning.
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- Vol 1 RE: Chapters 1, 3, 7, 8, 9, 10, App A, App B
desirable difficultiesspacing effectinterleaved practiceretrieval practicegeneration effecttransfer of learningdelayed retentionBook chapter Evidence summaryAt a glance
Bjork and Bjork explain why conditions that improve immediate performance can produce weak long-term learning, while conditions that introduce manageable difficulty can strengthen retention and transfer.
Key ideas
Desirable difficulties trigger encoding and retrieval processes that make memory more durable and flexible. Examples include spacing rather than massing practice, interleaving related categories or problem types, varying conditions of practice, and requiring generation or retrieval instead of repeated presentation. These methods often feel less fluent and produce more errors during acquisition, so learners and teachers may misjudge them as ineffective. The adjective desirable is essential: a challenge helps only when learners have enough prior knowledge and support to respond productively.
Why it matters
For educators, the chapter recommends evaluating methods with delayed, transferable performance and calibrating difficulty to the learner rather than equating smooth practice with lasting learning.
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- Vol 4 RE: App C
retrieval practicetransfer of learningmemory representationsknowledge organisationknowledge elaborationdelayed applicationretrieval feedbackJournal article Evidence summaryAt a glance
Carpenter reviews evidence that retrieval practice can improve not only retention of previously tested information but also transfer to new situations. The studies considered vary the delay between learning and application, the format of practice and final tests, and the knowledge domain or context.
Key ideas
Across this emerging literature, retrieving information often produces advantages over additional study even when the later task is not identical to practice. Proposed explanations include strengthening accessible memory representations and encouraging organisation or elaboration that supports flexible use. The review is cautious because the transfer literature was still small and transfer can take many forms. For educators, the findings support asking learners to retrieve and apply ideas through varied questions, formats, examples, and delays rather than repeating one test type.
Why it matters
Retrieval should be designed around meaningful knowledge and followed by feedback when errors could otherwise persist.
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What it contributes
Evidence summaries explain the central idea and why the source matters to educators.
How to access it
Entries link to lawful full text where available, or to a publisher, library or purchase page.
Edition abbreviations
- TE
- Teacher Edition
- PE
- Practice Edition
- RE
- Research Edition
Citation checks
References are checked against publisher records, scholarly indexes, DOI or ISBN metadata, repositories and author records where available. An entry marked [Citation not verified] preserves the wording found in the relevant volume without attributing findings to an unconfirmed work.
From sources to a coherent pathway