With high stakes attached to standardized tests in U.S. education, it is critical that these assessments accurately capture what students know and can do in a subject. For English Learners, this may be a challenge if they cannot fully demonstrate in English what they have learned. Native language assessments are one promising tool for overcoming this hurdle, though questions about when and with whom they are most effective remain.

States publish a wealth of data about their English Learner students’ academic achievement and other outcomes such as graduation rates. But the answer to the question “Who is an EL?” is not always the same. This brief explains how the EL subgroup varies across states and types of data, and why it is important to understand these differences when making decisions about how ELs and schools are faring.