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6 references
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- Vol 4 RE: Chapter 3
episodic bufferworking memorymultidimensional codingcross-modal integrationlong-term memory bindinglimited-capacity storageJournal article Evidence summaryAt a glance
Baddeley revises the original three-part working-memory model to explain findings it could not readily accommodate.
Key ideas
He proposes the episodic buffer: a limited-capacity temporary store that represents information in a multidimensional code and binds material from the phonological loop, visuospatial sketchpad, and long-term memory into coherent episodes. The buffer is accessible to conscious awareness and controlled by the central executive, but it provides storage rather than adding another executive process. This addition shifts attention from keeping subsystem contents separate to understanding how information is integrated across modalities and with prior knowledge.
Why it matters
For educators, the concept helps explain how words, images, spatial relations, and remembered knowledge can be combined into a meaningful representation, while reminding designers that this integrative workspace remains capacity limited.
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- Vol 1 RE: Chapters 2, 4
working memorycentral executivephonological loopvisuospatial sketchpaddual-task interferenceattentional controlJournal article Evidence summaryAt a glance
Baddeley reviews working memory as a limited system that temporarily stores and manipulates information needed for comprehension, reasoning, and learning.
Key ideas
The model replaces a single short-term store with interacting components. A central executive controls attention and coordinates two specialised systems: the phonological loop for speech-based material and the visuospatial sketchpad for visual and spatial information. Evidence from dual-task experiments, neuropsychology, and developmental research supports partial independence among these components. The framework explains how people can maintain one kind of information while processing another and why interference depends on whether tasks compete for the same resources.
Why it matters
For education, the article highlights the need to manage simultaneous processing demands, use verbal and visual representations deliberately, and recognise that attention control and temporary storage constrain complex classroom tasks.
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- Vol 1 RE: Chapter 4, App B
multicomponent working memorytemporary storageattentional controldual-task performanceverbal resourcesvisuospatial resourcesBook chapter Evidence summaryAt a glance
Baddeley and Hitch challenge the idea that short-term memory is a single passive store. Through a programme of dual-task experiments, participants carried a concurrent digit load while completing reasoning, comprehension, and learning tasks.
Key ideas
Performance declined gradually rather than collapsing when the nominal short-term capacity was filled, suggesting that temporary storage and processing rely on multiple components. The authors propose a flexible working-memory system with an attentional control mechanism and subsidiary verbal and visual-spatial resources. This architecture could support complex cognition while maintaining small amounts of information. Later work refined the components and terminology, but this chapter established the multicomponent research programme.
Why it matters
For educators, it explains why combining tasks that compete for the same temporary resources can be particularly disruptive and why external representations can reduce avoidable memory demands.
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- Vol 1 TE: App A
working memory capacitychunkingattention limitslong-term memoryinterferencerehearsalindividual differencesBook Evidence summaryAt a glance
Cowan’s book examines why working memory—the small amount of information kept readily accessible for current thought—has a sharply limited capacity.
Key ideas
It distinguishes this limit from long-term memory, sensory persistence, rehearsal, and strategies such as grouping items into meaningful chunks. Across behavioural evidence and competing theories, Cowan argues that a central focus of attention typically holds about three to four independent chunks in young adults. Apparent variation in span can arise because tasks differ in chunking, prior knowledge, interference, rehearsal opportunities, and measurement methods. The book compares item-limit, time-based, interference, attentional, biological, and evolutionary explanations and considers how capacity relates to comprehension, reasoning, learning, development, and individual differences.
Why it matters
Its practical lesson is not a simplistic rule about presenting exactly four items; instruction should reduce unnecessary simultaneous demands, connect new material with established knowledge, allow consolidation and retrieval, and recognise that meaningful organisation changes what counts as a chunk.
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- Vol 1 RE: Chapters 2, 4, App A, App B
short-term memory capacityworking memory chunksrehearsalsensory persistenceoutput interferencelong-term memorycapacity variabilityJournal article Evidence summaryAt a glance
Cowan reconsiders Miller’s famous seven-item estimate and argues that the capacity of a central short-term store is closer to four chunks in adults.
Key ideas
The review separates this core limit from processes that can inflate or depress observed span, including rehearsal, grouping, long-term-memory knowledge, sensory persistence, and output interference. Evidence is drawn from several paradigms—brief visual arrays, running spans, unattended speech, recall of unrelated materials, and tasks designed to restrict recoding. Converging estimates often fall near three to five meaningful units when auxiliary strategies are controlled. Cowan treats the proposal as a useful empirical generalisation rather than an invariant ceiling: capacity varies across people, ages, materials, and conditions, and defining a chunk is itself difficult.
Why it matters
For education, the paper cautions against literal “four-item” prescriptions while supporting designs that manage simultaneous information, build schemas that permit chunking, minimise irrelevant load, and give learners opportunities to rehearse, retrieve, and integrate new elements.
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- Vol 4 RE: Chapter 3
- Vol 4 TE: App C
- Vol 7 PE: App D
working memory limitsmeaningful chunkingconcurrent processingneural interferenceschema developmentattention guidancepractice sequencingJournal article Evidence summaryAt a glance
Cowan reviews the proposal that working memory contains a central store limited to roughly three to five meaningful items in young adults.
Key ideas
This relatively stable limit must be distinguished from performance on immediate-memory tasks, which can be altered by rehearsal, chunking, sensory memory, long-term knowledge, and the amount of concurrent processing. The article explains how researchers isolate the central limit, why estimates differ among individuals and across development, and several possible reasons a limit exists, including neural representation, interference, and the need to bind elements without confusion. Capacity matters because complex cognition requires information to remain available while it is combined, compared, or transformed. Educationally, the account supports reducing avoidable concurrent demands and helping learners organise knowledge, but it does not imply that every lesson should contain only four facts.
Why it matters
Meaningful chunks depend on expertise, and well-designed instruction expands effective performance by building schemas, guiding attention, and sequencing practice.
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Edition abbreviations
- TE
- Teacher Edition
- PE
- Practice Edition
- RE
- Research Edition
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