Claims

Doors to Discovery™ shows no discernible effects on preschool phonological processing (effect size 0.14, not significant)

Claim · All claims
Evidence · 1 study · causal r2 · q2 · i0 negligible
Currency · newest study 2013 · checked against its sources 2026-10-20 (automated, 1 of 1 entry) · 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.

q2 i0 In one study meeting standards with reservations, differences between the Doors to Discovery™ group and the comparison group on phonological processing were neither statistically significant nor substantively important (Pre-CTOPPP Elision effect size 0.14). → Doors to Discovery™ WWC Intervention Report 2013

Evidence

Doors to Discovery™ WWC Intervention Report 2013

Doors to Discovery™ WWC Intervention Report, U.S. Department of Education, What Works Clearinghouse. (2013). Doors to Discovery™ Intervention Report, Early Childhood Education. https://ies.ed.gov/ncee/wwc/InterventionReport/153

q2 · i0 · causal · r2

PCER Consortium (2008, Chapter 6) randomized study with high child-level attrition, 29 classrooms/182 children, using the Pre-CTOPPP Elision subtest with ANCOVA estimation. The reported effect size was 0.14 (improvement index +6), p > 0.05, rated an indeterminate effect and no discernible effects overall.

"The authors reported that differences between the Doors to Discovery™ group and the comparison group were not statistically significant and, according to WWC criteria, were not large enough to be considered substantively important."

Discussion

Learner Variables

Page metadata
Field Value
type claim
id doors-to-discovery-no-discernible-phonological-processing
title Doors to Discovery™ shows no discernible effects on preschool phonological processing (effect size 0.14, not significant)
description Doors to Discovery™ shows no discernible effects on preschool phonological processing (effect size 0.14, not significant)
status review
evidence_strength weak
newest_evidence 2013
source_checked 2026-10-20
generated by process:wiki-ingest on 2026-10-07
trust unverified — no one has confirmed this page's content
sources 1 — doors-to-discovery-wwc-intervention-report-2013

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