Red Light, Purple Light shows uncertain effects on preschool language outcomes¶
Claim · All claims
Evidence · 1 study · quant-synthesisr1·q3
Currency · newest study 2022 · 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 i? The language domain finding was not statistically significant, based on one study meeting WWC standards. → What Works Clearinghouse 2022
Evidence¶
What Works Clearinghouse 2022¶
What Works Clearinghouse, Institute of Education Sciences, U.S. Department of Education. (2022). Red Light, Purple Light. https://ies.ed.gov/ncee/wwc/InterventionReport/725
q3 · i? · quant-synthesis · r1
WWC synthesis of the language domain, based on one qualifying study (Schmitt et al., 2015) with 276 children using the WJ-III Picture Vocabulary subtest. The report states "The research does not support claims that Red Light, Purple Light improved student language."
"The research does not support claims that Red Light, Purple Light improved student language. This assessment is based on one study that meets WWC standards."
Discussion¶
Related Claims¶
- Red Light, Purple Light has potentially positive effects on preschool children's self-regulation, with moderate evidence — related
- Red Light, Purple Light shows uncertain effects on reading and literacy related achievement — possibly the same claim (merge candidate)
- A WWC expert panel distilled recent research into seven recommendations for preschool educators on preparing young children for school — related
Page metadata
| Field | Value |
|---|---|
type |
claim |
id |
red-light-purple-light-uncertain-language |
title |
Red Light, Purple Light shows uncertain effects on preschool language outcomes |
description |
Red Light, Purple Light shows uncertain effects on preschool language outcomes |
status |
review |
evidence_strength |
weak |
newest_evidence |
2022 |
generated |
by process:wiki-ingest on 2026-10-07 |
trust |
unverified — no one has confirmed this page's content |
sources |
1 — what-works-clearinghouse-2022 |
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