Ready, Set, Leap!® has no significant effect on preschool oral language (domain average effect size 0.02)¶
Claim · All claims
Evidence · 1 study · quant-synthesisr1·q3·i0negligible
Currency · newest study 2008 · 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.
q3 i0 Neither RCT found a statistically significant effect on oral language measured by PPVT-III or TOLD-P:3, and average effect sizes were below the WWC substantively-important threshold of 0.25. → What Works Clearinghouse 2008
Evidence¶
What Works Clearinghouse 2008¶
What Works Clearinghouse, U.S. Department of Education. (2008). WWC Intervention Report: Ready, Set, Leap!®. https://ies.ed.gov/ncee/wwc/InterventionReport/430
q3 · i0 · quant-synthesis · r1
Findings from two RCTs in the oral language domain. The appendix table prints a domain average effect size of 0.02 (ns) across studies, with improvement index +1 percentile points. PCER also used the TOLD-P:3 Grammatic Understanding subtest (effect size –0.11, ns).
"RMC Research Corporation (2003) reported no significant effect of Ready, Set, Leap!® on oral language as measured by the Peabody Picture Vocabulary Test-III (PPVT-III)."
Discussion¶
Learner Variables¶
- Oral Language — outcome: instruction changes it
Related Claims¶
- Ready, Set, Leap!® shows no discernible effects on oral language, print knowledge, phonological processing, early reading/writing, or math in preschoolers — a broader claim this one bears on
- Ready, Set, Leap!® has no significant effect on preschool early reading/writing (effect size 0.09) — related
- Ready, Set, Leap!® effects do not persist to kindergarten follow-up on oral language, print knowledge, or math measures — related
- Ready, Set, Leap!® shows no significant effect on preschool math; the study authors' negative finding was not significant in WWC calculations — related
- Ready, Set, Leap!® has no significant effect on preschool print knowledge (domain average effect size 0.06) — related
- Ready, Set, Leap!® has no significant effect on preschool phonological processing (domain average effect size 0.06) — related
- Pre-K Mathematics with DLM Early Childhood Express Math shows no discernible effects on preschool oral language — related
- Waterford Early Reading Level One™ shows no discernible effects on preschool children's oral language — related
Page metadata
| Field | Value |
|---|---|
type |
claim |
id |
ready-set-leap-null-oral-language |
title |
Ready, Set, Leap!® has no significant effect on preschool oral language (domain average effect size 0.02) |
description |
Ready, Set, Leap!® has no significant effect on preschool oral language (domain average effect size 0.02) |
status |
review |
evidence_strength |
moderate |
newest_evidence |
2008 |
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 — what-works-clearinghouse-2008 |
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