Randomized experiments are often considered the strongest designs to study the impact of educational interventions. Perhaps the most prevalent class of designs used in large scale education experiments is the cluster randomized design in which entire schools are assigned to treatments. In cluster randomized trials (CRTs) that assign schools to…

This mixed-methodological study examined changes in perceptions of teachers (n = 70) engaged in a two-year professional development program designed to meet the unique needs of English Language Learners (ELL), and changes in ELL students' (n = 235) math and reading achievement scores. The study was conducted in two urban middle schools in Kansas…