Practice that lasts
What spaced repetition is bad at
Spaced repetition is bad at serving as a complete substitute for the performance you ultimately need. The major spacing meta-analysis of verbal-recall research was explicitly restricted to verbal tasks. Its strong evidence for remembering words and facts does not by itself establish effects on procedures or workplace performance.1
A separate meta-analysis across varied performance tasks found an overall advantage for spaced over massed practice, but the result depended on task type and interval. Greater task complexity was associated with smaller spacing effects, and some combinations produced no advantage or a reversal.2 The practical response is not to abandon spacing. It is to stop asking a cue-and-answer system to rehearse every part of a complex activity.
The table separates supported uses from common overextensions.
| Practice target | What the evidence says | Practical implication |
|---|---|---|
| Verbal recall | The largest spacing review directly covered verbal-recall tasks.1 | Use it confidently for material you must retrieve. |
| Complex performance | Effects vary with task type, complexity, and interval.2 | Practise the complete task as well as its components. |
| Related unpractised material | Selective retrieval can impair later recall of related items.3 | Do not assume one practised card covers its neighbours. |
| Incorrect information | Repeated retrieval strengthened misleading details in crime-slide experiments.4 | Correct bad prompts and answers promptly. |
| Workplace performance | A performance-task review could not evaluate transfer back to the job.2 | Do not treat deck statistics as job-performance evidence. |
With twenty minutes, a learner preparing for a physical examination might review key terms and decision points, then spend part of the session performing or explaining the complete examination. A professional learning diagnosis might retrieve defining features, then work through cases that require choosing and defending a conclusion.
Erroneous retrieval is a possible risk, but whether this finding applies to ordinary spaced-repetition software has not been directly tested.4 In two misinformation experiments, repeatedly retrieving an incorrect detail made that detail more likely to be recalled as part of the original event two days later.4 A meta-analysis also found that practising selected material could harm later memory for related unpractised material, although this was not a direct test of ordinary spaced-repetition software.3
Boundary. The evidence does not support saying that spaced repetition is ineffective for every complex skill. It supports a narrower judgement: effects become more task-dependent as performance grows more complex, and cards do not directly rehearse every cue, action, or consequence of real performance.
参考文献
测验
Someone is learning to perform a physical examination. Which practice plan best respects the limits of spaced repetition?
- Use cards for key facts, then practise the complete examination
- Use cards for key facts and steps, then judge readiness from recall
- Use cards for key facts, then study demonstrations of the examination
Cards can support retrieval of components, but complete performance requires practice that includes the actions, cues, and decisions of the target task.
A trainee uses spaced cards that ask for each step of a physical examination. This alone rehearses the complete examination.
- True
- False
The evidence supports task dependence, not blanket ineffectiveness. Spaced practice may help components while complete performance still requires direct practice.
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