Curiosity Corner shows no discernible effects on preschool oral language outcomes across two studies meeting WWC standards¶

Claim · All claims
Evidence · 1 study · review r3 · q3
Currency · newest study 2009 · 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? Across a randomized controlled trial and a quasi-experimental study, differences between Curiosity Corner and comparison groups on oral language measures were not statistically significant or substantively important. → Curiosity Corner 2009

Evidence¶

Curiosity Corner 2009¶

Curiosity Corner. (2009). WWC Intervention Report, What Works Clearinghouse, U.S. Department of Education. https://www.successforall.org/early/early_curiosity.htm

q3 · i? · review · r3

WWC synthesis of two studies: PCER Consortium (2008), a randomized controlled trial with 18 preschools assessing PPVT-III and TOLD-P:3, and Chambers et al. (2001), a quasi-experimental study of 316 children using MSEL language scales. The report states "no discernible effects on oral language."

"According to WWC criteria, these two studies show no discernible effects on oral language."

Discussion¶

Learner Variables¶

Oral Language — outcome: instruction changes it

Chambers et al. report a statistically significant expressive language effect for 3-year-olds but not 4-year-olds, which WWC recalculation does not confirm — related
Curiosity Corner shows no discernible effects on cognition in the Chambers et al. quasi-experimental study — related
Curiosity Corner shows no discernible effects on preschool math outcomes in the PCER randomized trial — related
Curiosity Corner shows no discernible effects on preschool print knowledge in the PCER randomized trial — related
Curiosity Corner shows no discernible effects on phonological processing in the PCER randomized trial — related
Ready, Set, Leap!® shows no discernible effects on oral language, print knowledge, phonological processing, early reading/writing, or math in preschoolers — related
Curiosity Corner improves expressive language but not receptive language in a New Jersey cluster randomized study — related
Waterford Early Reading Level One™ shows no discernible effects on preschool children's oral language — related

Page metadata

Field	Value
`type`	`claim`
`id`	`curiosity-corner-no-discernible-oral-language-effects`
`title`	`Curiosity Corner shows no discernible effects on preschool oral language outcomes across two studies meeting WWC standards`
`description`	`Curiosity Corner shows no discernible effects on preschool oral language outcomes across two studies meeting WWC standards`
`status`	`review`
`evidence_strength`	`strong`
`newest_evidence`	`2009`
`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 — `curiosity-corner-2009`

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