Curiosity Corner shows no discernible effects on preschool print knowledge in the PCER randomized trial¶

Claim · All claims
Evidence · 1 study · causal r2 · q3
Currency · newest study 2009 · checked against its sources 2026-10-20 (automated, 1 of 1 entry) · not reviewed by a person

Subclaims¶

q3 i? In the PCER Consortium (2008) randomized controlled trial, treatment and control groups did not differ significantly or substantively on TERA-3, WJ III Letter-Word Identification, or WJ III Spelling. → 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? · causal · r2

Randomized controlled trial (PCER Consortium, 2008) with 18 preschools; print knowledge assessed with TERA-3, WJ III Letter-Word Identification, and WJ III Spelling subtests. The report confirms "no discernible effects on print knowledge."

"The study shows, and the WWC confirms, no statistically significant or substantively important differences between treatment and control groups on any of these measures, and thus, no discernible effects on print knowledge."

Discussion¶

Learner Variables¶

• Alphabet Knowledge and Print Awareness — outcome: instruction changes it

Related Claims¶

• Bright Beginnings shows a substantively important positive effect on the TERA-3 print knowledge measure (effect size 0.32) but no discernible effect on the print knowledge domain overall — related
• Kindergarten follow-up shows statistically significant positive effects of Curiosity Corner on two print knowledge measures, not included in the effectiveness rating — 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 oral language outcomes across two studies meeting WWC standards — related
• Curiosity Corner shows no discernible effects on phonological processing in the PCER randomized trial — related
• The Bright Beginnings preschool curriculum shows no discernible effects on preschool children's school readiness across oral language, print knowledge, phonological processing, and math domains — a broader claim this one bears on
• Ready, Set, Leap!® shows no discernible effects on oral language, print knowledge, phonological processing, early reading/writing, or math in preschoolers — related
• Headsprout Early Reading has a statistically significant positive effect on the print knowledge of at-risk preschool children — related
• Curiosity Corner shows significant positive kindergarten follow-up effects on early reading and letter-word identification, averaging +0.27 — related
• In the PCER study, Curiosity Corner showed non-significant positive effects on immediate reading and phonological measures — a broader claim this one bears on
• Two cluster randomized experiments with 225 students rate Curiosity Corner as Promising with an average kindergarten follow-up effect of +0.33 — reports the opposite
• Randomized trials of Success for All find significant positive impacts on K-2 early reading, strongest for students starting with lower achievement — related