Organization: Institute of Education Sciences, What Works Clearinghouse
The What Works Clearinghouse review of interventions for beginning reading addresses student outcomes in four domains: alphabetics, fluency, comprehension, and general reading achievement. There are three studies that contribute to the effectiveness ratings in the reports that cover the four domains. Peer-Assisted Learning/Literacy Strategies was found to have potentially positive effects on alphabetics, no discernible effects on fluency, and mixed effects on comprehension for beginning readers.
https://ies.ed.gov/ncee/wwc/Docs/InterventionReports/wwc_pals_050112.pdf