We examined the effect of intervention dosage on mathematics outcomes for students with or at risk for mathematics learning disability in kindergarten through third grade. Using linear and nonlinear models, we meta-analyzed 164 effect sizes from 24 published experimental and quasi-experimental studies. Results supported a linear model and an…

For many students at risk of reading difficulties, effective, early reading instruction can improve reading outcomes and set them on a positive reading trajectory. Thus, response-to-intervention models include a focus on a student's Tier I reading instruction as one element for preventing reading difficulties and identifying students with a…