Multilingual learners (MLs) are the country's fastest-growing student population: One in five students speak a language other than English at home, and 10 percent of the student population across the country is identified for language development services in school. Despite these students' growing presence nationwide, relatively few best practices…

Background: Over the years, the quantity and quality of educational research has been rapidly improving. This can be attributed to the growing call to use evidence of effectiveness in decision-making by policymakers and practitioners. In fact, evidence sufficient to establish programs as "small", "moderate", or…