Classroom testing (quizzing) significantly boosts student academic achievement to a medium extent (g = 0.499).¶

Claim · All claims
Evidence · 1 study · quant-synthesis r3 · q4 · i2 medium
Currency · newest study 2021 · checked against its sources 2026-10-19 (automated, 1 of 1 entry) · not reviewed by a person

Subclaims¶

q4 i2 Across 222 independent classroom studies integrating 48,478 students' data, quizzing raises academic achievement with a medium pooled effect size (g = 0.499). → Yang 2020

Evidence¶

Yang 2020¶

Yang, C., Luo, L., Vadillo, M. A., Yu, R., & Shanks, D. R. (2021). Testing (Quizzing) Boosts Classroom Learning: A Systematic and Meta-Analytic Review. Psychological Bulletin. https://doi.org/10.1037/bul0000309

q4 · i2 · quant-synthesis · r3

Meta-analysis of 222 independent classroom studies integrating 48,478 students' data; the review reports that "overall testing (quizzing) raises student academic achievement to a medium extent ( g = 0.499)", i.e. a pooled effect size of g = 0.499, with p-curve support and small publication-bias risk.

"The current review integrated 48,478 students’ data, extracted from 222 independent studies, to investigate the magnitude, boundary conditions, and psychological underpinnings of test-enhanced learning in the classroom. The results show that overall testing (quizzing) raises student academic achievement to a medium extent ( g = 0.499)."

Studies bearing on this claim¶

In real courses, do quizzes raise achievement, and when, how often and with what questions should they be given? This table gathers the studies behind this claim and the 9 narrower claims that bear on it: 6 distinct studies (2 quant-synthesis, 2 review, 1 causal, 1 associational), q2–q4, 2 of 6 with an effect size coded. One row per study, codes as each entry records them; no effect is averaged and no verdict is drawn. Built by scripts/synthesize_claim.py from eval/synthesis/; a row that looks wrong is fixed on the claim it comes from.

Discussion¶

Related Claims¶

• Retrieval practice improves long-term retention — the general claim this finding bears on, with the studies behind it
• Retrieval practice and spaced retrieval improve achievement and retention by medium amounts, while interleaving helps category learning only for some materials and blocking beats it for words — possibly the same claim (merge candidate)
• Feedback Enhances Retrieval Practice — related
• The classroom testing effect transfers to mismatched test formats, but consistent quiz–exam formats yield a significantly larger effect (g = 0.531 vs. g = 0.399). — related
• Quizzing outperforms no/filler activity, fewer-question testing and restudying, with a larger advantage over no/filler activity (low reexposure) than over restudying (high reexposure); against other elaborative strategies its advantage is small and not significant. — related
• Group testing shows advantages in some studies but mixed results overall for long-term retention and transfer — a narrower finding that bears on this claim
• The classroom testing effect increases with the number of test repetitions on the same content. — related
• Both preclass (g = 0.186) and postclass (g = 0.536) quizzes enhance learning, with postclass quizzes more effective; benefits increase with treatment duration. — related
• Quizizz-based gamification improved word memorization over traditional methods for intermediate learners — related
• Classroom pretesting improves high-stakes exam performance on pretested content by 8–9% over a multi-week course — related