This brief examines one 2006 study rather than surveying the current literature.
- Claims about the experiment refer to Roediger and Karpicke's paper.
- The practical suggestions below are inferences from that study.
Retrieval practice means attempting to recall material instead of simply reading it again.
- The definition describes an activity rather than a claim that every test improves learning.
The study compared rereading prose with taking free-recall tests.
- Its two experiments included testing without feedback.
- Final retention tests occurred after five minutes, two days, or one week across the experiments.
The reported advantage depended on when retention was measured.
- Rereading performed better at the five-minute delay.
- Prior testing performed better at the longer delays.
- Rereading also increased participants' confidence more than testing did.
The results separate immediate performance from delayed retention.
My inference is that an activity's immediate ease can be a poor guide to its later value.
- Feeling fluent while rereading would not establish durable recall.
- Struggling during recall would not establish that the attempt was wasted.
- This inference is narrower than a claim that difficulty always improves learning.
A useful next experiment would measure the kind of learning the reader actually wants.
- For factual material, compare later recall after equal study time.
For mathematics, include new problems rather than measuring only remembered wording.
- Recalling a theorem's statement would not establish the ability to apply it.
- Applying a theorem in a familiar exercise would not establish transfer to unfamiliar problems.
- These proposed comparisons are extensions rather than results reported in the paper.
The study's scope [1] limits what this brief can establish.
- This brief has not assessed replications or later reviews.
- Prose-recall results alone do not establish effects for every subject or learner.
- A research synthesis would need to examine broader evidence before recommending a universal study schedule.