We present findings from a randomized controlled trial of Descubriendo la Lectura (DLL), an intervention designed to improve the literacy skills of Spanish-speaking first graders, who are struggling with reading. DLL offers one-on-one native language literacy instruction for 12 to 20 weeks to each school’s lowest performing first-graders. Examining literacy outcomes for 187 students, hierarchical linear model analyses revealed statistically significant effects of student-level assignment to DLL on all 9 outcomes evaluated. Impacts were as large as 1.24 standard deviations, or a learning advantage relative to controls exceeding a full school year of achievement growth. The mean effect size of d = 0.66 across the nine literacy measures is equal to approximately two thirds of the overall literacy growth that occurs across the first-grade year.
American Educational Research Journal
Year of Study
Descubriendo la Lectura (DLL)
Randomized Controlled Trial
Borman, G. D., Borman, T. H., Park, S. J., & Houghton, S. (2019). A Multisite Randomized Controlled Trial of the Effectiveness of Descubriendo la Lectura. American Educational Research Journal