Multi-age classes show no significant cognitive or noncognitive differences from single-age classes¶

Claim · All claims
Evidence · 1 study · quant-synthesis r2 · q3 · i0 negligible
Currency · newest study 1996 · not yet checked against its sources · not reviewed by a person

Subclaims¶

Reading the evidence codes

q is the design tier, i the impact, n the sample, and the kind with its r the rigour judged within that kind: what each code means.

This claim: no standardized effect is recorded in observations/ for it yet, so no benchmark reading is possible.

q3 i0 Weighted average effect sizes for multi-age versus single-age classes were small and non-significant for both cognitive (d = -.05) and noncognitive (d = +.08) outcomes, with confidence intervals including zero. → Simon Veenman 1996

Evidence¶

Simon Veenman 1996¶

Simon Veenman. (1996). Effects of multigrade and multi-age classes reconsidered. Review of Educational Research, 66(3), 323-340. https://doi.org/10.2307/1170526

q3 · i0 · quant-synthesis · r2

Meta-analysis of 11 multi-age studies (Table 2): cognitive effects d = -.05 (N = 4,142, CI -.15 to .04, homogeneous); noncognitive effects d = +.08 (N = 4,104, CI -.03 to .20). The article reports confidence intervals around average effect sizes included 0.00 for all analyses.

"Multi-age classes: Cognitive effects All studies (zeros 11 4, 142 -.05 -.15 to .04 12.35"

Discussion¶

Learner Variables¶

Age and Developmental Stage — predictor: learners who differ on it differ in outcomes

Grade level moderates multigrade cognitive effects, with a diminishing positive effect from lower to higher grades — related
Meta-analysis shows no significant difference in cognitive outcomes between multigrade and single-grade classes — possibly the same claim (merge candidate)
Noncognitive outcomes of multigrade classes show essentially zero overall effect after outlier removal — possibly the same claim (merge candidate)
Country of publication moderates multigrade cognitive effects, with a small negative effect only for European studies — related
Multigrade classes show negative weighted effects for science and social studies but not English as a foreign language — related
Evidence for a selection bias favoring multigrade classes is limited, found explicitly in only 4 of 51 studies — related
Staff development for multigrade teachers improved time-on-task and teaching skills but did not raise achievement relative to untrained single-grade classes — related

Page metadata

Field	Value
`type`	`claim`
`id`	`multi-age-effects-near-zero`
`title`	`Multi-age classes show no significant cognitive or noncognitive differences from single-age classes`
`description`	`Multi-age classes show no significant cognitive or noncognitive differences from single-age classes`
`status`	`review`
`evidence_strength`	`moderate`
`newest_evidence`	`1996`
`generated`	by `process:wiki-ingest` on `2026-10-20`
`trust`	unverified — no one has confirmed this page's content
`sources`	1 — `simon-veenman-1996`

Frontmatter is the page's machine-readable record — see the Schema & Guide.