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A group of closely related outcomes.
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.
The Department of Education’s evidence tiers. For more information, please see the WWC Glossary entry for evidence tiers.
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.
|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|
|General Literacy Achievement||1-3|
|General Mathematics Achievement||1-2|
Last Updated: May 2023
|Other or unknown||16%|
|Two or more races||<1%|
|Not Hispanic or Latino||86%|
|Other or unknown||11%|
This intervention report was prepared for the WWC by Mathematica under contract WWC-OREGANO-91990018C0009.