Effectiveness of Four Supplemental Reading Comprehension Interventions

This article presents evidence from a large-scale randomized controlled trial of the effects of four supplemental reading comprehension curricula (Project CRISS, ReadAbout, Read for Real, and Reading for Knowledge). The impact analyses in the study's first year revealed a statistically significant negative impact of Reading for Knowledge on students' reading comprehension scores and no other significant impacts. The impact of ReadAbout was positive and significant in the study's second year among teachers with one year of experience using the intervention.