Evidence base for Waterford Early Reading Level One™ is small, with no standards-meeting studies in four of six outcome domains¶
Claim · All claims
Evidence · 1 study · causalr2·q3
Currency · newest study 2007 · 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 i? Only one study met WWC evidence standards, covering only oral language and print knowledge; no studies meeting standards addressed phonological processing, early reading/writing, cognition, or math. → What Works Clearinghouse 2007
Evidence¶
What Works Clearinghouse 2007¶
What Works Clearinghouse, U.S. Department of Education. (2007). WWC Intervention Report: Waterford Early Reading Level One™. https://ies.ed.gov/ncee/wwc/InterventionReport/541
q3 · i? · causal · r2
WWC extent-of-evidence categorization: one study, six centers, 19 classrooms/270 children per domain rated "small"; the other four domains had zero qualifying studies. Two additional reviewed studies did not meet evidence screens (no comparison group; incomparable groups at baseline).
"The WWC considers the extent of evidence for Waterford Early Reading Level One™ to be small for oral language and for print knowledge. No studies that met WWC evidence standards with or without reservations addressed phonological processing, early reading/writing, cognition, or math."
Discussion¶
Related Claims¶
- The evidence base for Waterford Early Reading Program™ is thin: only one of 36 reviewed studies met WWC evidence standards, and extent of evidence was rated small for both domains — possibly the same claim (merge candidate)
- In the qualifying quasi-experimental study, at-risk Kindergarten students using Waterford Level One for 15-minute daily sessions were matched to comparison students and pretested in fall and posttested in spring — related
- Waterford Early Reading Program™ showed no discernible effects on comprehension, with a small non-significant effect size on vocabulary — related
- The WWC rated Waterford Early Reading Program™ as having potentially positive effects on alphabetics, based on a substantively important average effect size with no statistically significant individual outcomes — related
- Alphabetics improvement-index findings for Waterford Early Reading Program™ were inconsistent across outcomes, ranging from –26 to +37 percentile points — related
- Waterford Upstart participation shows statistically significant positive effects on early literacy skills in matched quasi-experimental cohorts — related
- Waterford Early Reading Level One™ shows no discernible effects on preschool children's print knowledge — related
- The evidence base for Building Blocks for Math is small and limited to the math domain — related
- Waterford Early Reading Level One™ and Let's Begin with the Letter People® produce similar outcomes in oral language and print knowledge — related
Page metadata
| Field | Value |
|---|---|
type |
claim |
id |
waterford-level-one-small-extent-of-evidence |
title |
Evidence base for Waterford Early Reading Level One™ is small, with no standards-meeting studies in four of six outcome domains |
description |
Evidence base for Waterford Early Reading Level One™ is small, with no standards-meeting studies in four of six outcome domains |
status |
review |
evidence_strength |
moderate |
newest_evidence |
2007 |
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-2007 |
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