VIP shows no statistically significant or substantively important impacts on PPVT-R and Morphology outcomes for English language learners¶

Claim · All claims
Evidence · 1 study · causal r2 · q3 · i0 negligible
Currency · newest study 2006 · 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 i0 VIP had no statistically significant and no substantively important impacts on the Peabody Picture Vocabulary Test-Revised (effect size –0.11, improvement index –4) and the Morphology measure (effect size 0.18, improvement index +7). → Vocabulary Improvement Program for English Language Learners and Their Classmates 2006

Evidence¶

Vocabulary Improvement Program for English Language Learners and Their Classmates 2006¶

Vocabulary Improvement Program for English Language Learners and Their Classmates. (2006). What Works Clearinghouse Intervention Report, U.S. Department of Education. http://www.brookespublishing.com/store/books/lively-6342/index.htm

q3 · i0 · causal · r2

In the same WWC subsample analysis of the randomized controlled trial, the PPVT-R showed effect size –0.11 (mean difference –2.35, favoring comparison) and Morphology showed 0.18; both were ns. Fewer than a third of Morphology words were included in the intervention, and PPVT-R is a standardized test of untaught vocabulary.

"The WWC analysis of the English language learner subsample found no statistically significant and no substantively important impacts on the Peabody Picture Vocabulary Test-Revised (PPVT-R) and the Morphology measure."

Discussion¶

Learner Variables¶

Morphological Awareness — outcome: instruction changes it

VIP shows potentially positive effects on reading achievement for fifth-grade English language learners (effect size 0.50, not statistically significant) — related
VIP produces a statistically significant effect on Word Mastery (taught-word definition selection) for English language learners, effect size 1.03 — related
Morphology+ showed larger positive effects in the informational text (+0.17) and vocabulary (+0.18) subdomains than the overall reading effect — related
Content-Focused Coaching shows a larger effect for English learners (+0.46) than for non-English learners (+0.18) — related
The intervention showed substantively important but WWC-unconfirmed effects on English language development, with non-significant CTBS Language and Writing outcomes — related

Page metadata

Field	Value
`type`	`claim`
`id`	`vip-null-ppvt-morphology-impacts`
`title`	`VIP shows no statistically significant or substantively important impacts on PPVT-R and Morphology outcomes for English language learners`
`description`	`VIP shows no statistically significant or substantively important impacts on PPVT-R and Morphology outcomes for English language learners`
`status`	`review`
`evidence_strength`	`moderate`
`newest_evidence`	`2006`
`generated`	by `process:wiki-ingest` on `2026-10-07`
`trust`	unverified — no one has confirmed this page's content
`sources`	1 — `vocabulary-improvement-program-for-english-language-learners-and-their-classmates-2006`

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