World of Words produced a statistically significant medium-to-large effect on a researcher-developed vocabulary inductive reasoning test (effect size 0.66)¶
Claim · All claims
Evidence · 1 study · causalr?·q3·i2medium
Currency · newest study 2023 · 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 i2 In the Neuman et al. (2011) cluster-randomized trial, children receiving World of Words scored significantly higher than comparison children on the researcher-developed vocabulary inductive reasoning test (effect size 0.66, improvement index +25, p < 0.01). → inductive-test
Evidence¶
inductive-test¶
What Works Clearinghouse, Institute of Education Sciences, U.S. Department of Education. (2023, August). World of Words. https://whatworks.ed.gov
q3 · i2 · causal · r?
Cluster randomized controlled trial (meets WWC standards without reservations) of 460 children in 28 classrooms across 12 Head Start preschool sites in an urban area, assessed at the end of 24 weeks. Intervention mean was "0.67 (0.21)" versus "0.53 (0.20)", with printed effect size 0.66 and improvement index +25.
"End of 24 weeks of implementation 460 children 12 preschool sites in the United States 0.67 (0.21) 0.53 (0.20) 0.66 +25 Yes (p < 0.01)"
Discussion¶
Learner Variables¶
- Vocabulary — outcome: instruction changes it
Related Claims¶
- World of Words produced a statistically significant medium effect on a comprehension composite measure (effect size 0.54) after 12 weeks — related
- World of Words showed no statistically significant effects on the Woodcock-Johnson Picture Vocabulary Subtest or the PPVT-IV — related
- World of Words produced a statistically significant medium effect on expressive vocabulary (Expressive One-Word Picture Vocabulary Test, 4th Edition; effect size 0.43) in a scaled-up 12-site study — related
- World of Words produced a large, statistically significant effect on taught-word sorting performance (effect size 0.94) in a two-site Head Start study — related
- The intervention produced significant effects on researcher-developed measures of vocabulary depth but not vocabulary breadth — related
- A 16-week universally designed online depth-of-vocabulary intervention improved standardized vocabulary knowledge relative to a control group in fifth graders — related
- World of Words has positive effects on the language outcome domain for prekindergarten children, with an average effect size of 0.43 across four studies — a broader claim this one bears on
Page metadata
| Field | Value |
|---|---|
type |
claim |
id |
world-of-words-inductive-reasoning-significant |
title |
World of Words produced a statistically significant medium-to-large effect on a researcher-developed vocabulary inductive reasoning test (effect size 0.66) |
description |
World of Words produced a statistically significant medium-to-large effect on a researcher-developed vocabulary inductive reasoning test (effect size 0.66) |
status |
review |
evidence_strength |
moderate |
newest_evidence |
2023 |
generated |
by process:wiki-ingest on 2026-10-07 |
trust |
unverified — no one has confirmed this page's content |
sources |
1 — inductive-test |
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