English Language Learners (ELLs) are a highly diverse group of students who are the fastest growing segment of the student population in the U.S. ELLs make up a heterogeneous group with varying levels of English proficiency, cultural backgrounds, and academic needs. While some states like California, Texas, New York, Florida and Illinois have seen large increases in their ELL populations, ELL students are increasingly present in all 50 states. There is no single approach that can adequately meet the diverse educational needs of ELL students.