Research in the Child Language and Literacy Lab (CHILLL) http://chilll.asu.edu focuses on early literacy development and assessment and treatment of language disorders in preschool and school age children. One line of research is investigating lexical acquisition deficits in preschoolers with specific language impairment (SLI), dyslexia, and children learning English as a second language. Our program of research is designed to develop methods for identifying the individual working memory and word-learning deficits of these children and to evaluate prescriptive treatments targeting those deficits. A second line of research is investigating how best to improve listening and reading comprehension in preschool and primary elementary grades by studying children’s longitudinal growth in these areas and by developing and evaluating new interventions. A third line of research is to evaluate the efficacy of an early childhood language and literacy curriculum.