Efficacy Trials with a New Early Language and Literacy Curriculum for Preschool Children with Developmental Speech and/or Language Impairment Home Efficacy Trials with a New Early Language and Literacy Curriculum for Preschool Children with Developmental Speech and/or Language Impairment Principal investigator Jeanne Wilcox Award start date 02/01/2011 Award end date 06/30/2016 Originating sponsor U.S. Department of Education