English language learners (ELLs) with disabilities are a growing part of the K-12 school population nationwide. The available knowledge on how to effectively educate K-12 English language learners with disabilities, and measure their progress, is small but growing. However, many educators and families have pressing questions. How can educators distinguish between language-related needs and disability-related needs when evaluating and teaching these students? How do these students fit into and benefit from current teaching approaches? How can schools create more collaboration between language-related and disability-related services in meeting the complex needs of ELLs with disabilities? And, for their parents, how do the special education and English as a second language systems work, what are their child's options and rights, and what is the family's role in Individualized Education Programs and other aspects of their child's education? The 18 articles in this issue of "Impact" offer responses to these questions from people around the country who are helping the nation's education system respond to the needs of this growing student population.