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A summary of the effectiveness of an intervention in an outcome domain, based on the quality of research, the statistical significance of findings, the magnitude of findings, and the consistency of findings across studies.
![]() Positive: strong evidence that intervention had a positive effect on outcomes. |
![]() Potentially Positive: evidence that intervention had a positive effect on outcomes with no overriding contrary evidence. |
![]() Mixed: evidence that intervention’s effect on outcomes is inconsistent. |
![]() No Discernible: no evidence that intervention had an effect on outcomes. |
![]() Potentially Negative: evidence that intervention had a negative effect on outcomes with no overriding contrary evidence. |
![]() Negative: strong evidence that intervention had a negative effect on outcomes. |
For more, please see the WWC Glossary entry for rating of effectiveness.
Evidence Tier.
The percent of each characteristic is based on the sample size of all studies meeting standards that reported data on the characteristic.
Percentages below may not add to 100 percent.
Outcome Domain | Effectiveness Rating | Grades | Evidence Tier |
---|---|---|---|
Alphabetics | The WWC could not calculate effect sizes for any of the findings that meet standards in this domain. | K |
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General Literacy Achievement | ![]() |
1-3 |
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General Mathematics Achievement | ![]() |
1-2 |
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Intrapersonal Competencies | ![]() |
K-5 |
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School Climate | ![]() |
2-5 |
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Student Behavior | ![]() |
K-11 |
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Teacher Practice | ![]() |
K-4 |
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Writing Conventions | ![]() |
1-2 |
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Writing productivity | ![]() |
1-2 |
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Last Updated: May 2023
Race
Asian | 1% | |
Black | 43% | |
Native American | <1% | |
White | 41% | |
Other or unknown | 16% | |
Two or more races | <1% |
Ethnicity
Hispanic | 3% | |
Not Hispanic or Latino | 86% | |
Other or unknown | 11% |
Gender
Free & Reduced-Price Lunch
English Learners
This intervention report was prepared for the WWC by Mathematica under contract WWC-OREGANO-91990018C0009.