At a 1-day test delay, interleaved practice yields a moderate benefit over blocked practice (d = 0.42)¶
Claim · All claims
Evidence · 1 study · causalr2·q3·i2medium
Currency · newest study 2015 · not yet checked against its sources · not reviewed by a person
Subclaims¶
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q3 i2 Students tested 1 day after the review scored 80% vs. 64%, a statistically significant moderate interleaving benefit (d = 0.42). → Rohrer 2015
Evidence¶
Rohrer 2015¶
Rohrer, D., Dedrick, R. F., & Stershic, S. (2015). Interleaved practice improves mathematics learning. Journal of Educational Psychology, 107(3), 900-908. https://doi.org/10.1037/edu0000001
q3 · i2 · causal · r2
Classroom test administered 1 day after the review session, comparing students assigned to the 1-day delay (n = 63 per delay group as printed). Interleaved mean was 80% versus blocked 64%, with Cohen's d = 0.42 and 95% CI [0.07, 0.77].
"Students tested 1 day after the review showed a moderate benefit of interleaving, 80% (SD = 33%) vs. 64% (SD = 42%), t(62) = 2.39, p = .02, d = 0.42, 95% confidence interval (CI) [0.07, 0.77]."
Discussion¶
Related Claims¶
- The test benefit of interleaved practice does not diminish over time and perhaps grows larger (d = 0.79 at 30 days) — related
- The interleaving benefit appears in three of four problem-type-by-delay comparisons; the slope-problem effect at 1 day was not statistically significant — related
- Interleaved practice provided near immunity against forgetting over a 30-fold increase in test delay — related
- Interleaved practice produces higher mathematics test scores than blocked practice in a classroom experiment — related
- The interleaving benefit is not caused by spacing, and the benefit extends to delayed tests — a broader claim this one bears on
- Interleaved practice improves delayed posttest performance compared with blocked practice — a broader claim this one bears on
- In Experiment 2, the interleaving benefit on actual test outcomes was not statistically significant, unlike in Experiment 1 — related
Page metadata
| Field | Value |
|---|---|
type |
claim |
id |
interleaved-benefit-one-day-delay-d042 |
title |
At a 1-day test delay, interleaved practice yields a moderate benefit over blocked practice (d = 0.42) |
description |
At a 1-day test delay, interleaved practice yields a moderate benefit over blocked practice (d = 0.42) |
status |
review |
evidence_strength |
moderate |
newest_evidence |
2015 |
generated |
by process:wiki-ingest on 2026-10-13 |
trust |
unverified — no one has confirmed this page's content |
sources |
1 — rohrer-2015 |
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