The WWC found Voyager Universal Literacy System® had potentially negative effects on comprehension¶

Claim · All claims
Evidence · 1 study · causal r2 · q2 · i2 medium
Currency · newest study 2007 · not yet checked against its sources · not reviewed by a person

Subclaims¶

q2 i2 The single comprehension outcome (Stanford-Binet Expressive Vocabulary) showed a substantively important negative effect size of –0.67. → Voyager Universal Literacy System® — WWC Intervention Report 2007

Evidence¶

Voyager Universal Literacy System® — WWC Intervention Report 2007¶

Voyager Universal Literacy System® — WWC Intervention Report. (2007). What Works Clearinghouse, U.S. Department of Education. https://ies.ed.gov/ncee/wwc/InterventionReport/538

q2 · i2 · causal · r2

One quasi-experimental study (Hecht, 2003; 213 kindergarten students in four low-income Orange County, Florida schools) contributed the only comprehension finding. The WWC-printed effect size was –0.67 (medium-to-large negative), with an improvement index of –25 percentile points.

"Hecht (2003) reported a negative and statistically significant effect on the Stanford-Binet Intelligence Expressive Vocabulary subtest. This outcome was not statistically significant according to the WWC analysis but the effect size was large enough to be substantively important (that is, smaller than –0.25)."

Discussion¶

Related Claims¶

• Evidence extent for Voyager is moderate to large for alphabetics and small for comprehension, with no qualifying studies of fluency or general reading achievement — related
• The WWC found Voyager Universal Literacy System® had potentially positive effects on alphabetics for kindergarten students — related
• The Frechtling, Zhang, and Silverstein (2006) study showed a substantively important positive average alphabetics effect, while Hecht (2003) did not — related