Writing instruction produces a statistically significant positive overall effect on the writing performance of K-12 English language learners in the United States (g = 0.33)¶

Claim · All claims
Evidence · 1 study · quant-synthesis r? · q3 · i1 small
Currency · newest study 2026 · not yet checked against its sources · not reviewed by a person

Subclaims¶

q3 i1 Across 122 effect sizes from 39 comparisons in 20 studies, the overall impact of writing instruction on ELL students' writing was statistically significant and positive (g = 0.33). → Aitken 2026

Evidence¶

Aitken 2026¶

Aitken, A. A., Graham, S., Cao, Y., & Nusrat, A. (2026). The Impact of Writing Instruction for English Language Learners in the United States: A Meta-Analysis. Educational Psychology Review. https://doi.org/10.1007/s10648-026-10197-6

q3 · i1 · quant-synthesis · r?

Meta-analytic synthesis of 39 treatment-control comparisons across 20 experimental and quasi-experimental studies of K-12 ELL writing instruction in the United States, using a Correlated and Hierarchical Effects model with robust variance estimation. The printed effect size is g = 0.33: the article reports "the overall impact of writing instruction was statistically significant and positive ( g = 0.33)", a small standardized effect.

"From 122 effect sizes, the overall impact of writing instruction was statistically significant and positive ( g = 0.33)."

Discussion¶

Learner Variables¶

• Writing Skills — outcome: instruction changes it

Related Claims¶

• Process writing yields a meaningful but not statistically significant effect (g = 0.51) on US ELL students' writing — a narrower finding that bears on this claim
• The pooled effect of writing instruction for US ELL students is robust to sensitivity analyses but funnel plot asymmetry suggests possible missing positive effect sizes — possibly the same claim (merge candidate)
• Peer response groups increase the number of idea units in English learners' writing but show no significant effect on composition quality or sentences written (Prater & Bermudez, 1993) — a narrower finding that bears on this claim
• Writing interventions improve writing quality, the most frequently assessed outcome, with an effect of 0.33 for US ELL students — possibly the same claim (merge candidate)
• Process Writing Improves Writing Quality — related
• Strategy instruction significantly improves the writing of US ELL students (g = 0.36) — a narrower finding that bears on this claim
• ICT-supported writing interventions targeting higher-level writing processes show a large overall positive effect on students' writing quality (g = 1.264) — related