Working memory
Working memory is the small, temporary store of information that pupils use to think. It limits how much new material a pupil can process at once.
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Working memory is the corner of mental architecture that teaching most has to plan around. Long-term memory is generous. Working memory is not.
What it is
The mental workspace where pupils hold information for the few seconds it takes to do something with it. Alan Baddeley’s model splits it into a phonological loop for verbal material, a visuospatial sketchpad for images and locations, and a central executive that controls attention.
Capacity is small. Nelson Cowan’s 2010 review settled on around four chunks for adults. For children it is smaller. Working memory also empties fast unless the learner rehearses or uses the information.
Why it matters
If a lesson asks pupils to hold five new ideas at once, working memory overflows and learning stops. The pupil ends the lesson exhausted but with little to show for it. The same content split into three smaller chunks, each rehearsed before the next, lands far better.
Cognitive load theory is the practical application of working memory research to classroom design.
How to use it
Plan around the bucket. Break new content into short sequences. Use worked examples so pupils do not have to hold the whole problem in mind while learning the procedure. Pair words with diagrams so the load splits across the verbal and visual channels. Repeat key vocabulary so it moves from working memory into long-term memory.
For pupils with known working memory difficulties, also reduce the number of instructions per direction, write them down, and check understanding before the activity starts.
When not to use it
Working memory is a constraint on instruction, not a goal of instruction. The aim is to teach material into long-term memory, where capacity is effectively unlimited.
Related Chalk tools
Frayer Model, Visual Keywords, and Worksheet Creator are designed to keep working memory load down while pupils encode new material.
Evidence
Working memory capacity is one of the best-evidenced findings in cognitive psychology. Baddeley's multi-component model and Cowan's roughly four-chunk capacity estimate are foundational. Classroom translation runs through cognitive load theory.
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Related concepts
Questions teachers ask
How big is working memory?
Can working memory be trained?
What does limited working memory look like in class?
Frayer Model
Vocabulary instruction template with definition, characteristics, examples, and non-examples.
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