An evaluation of the impacts of research-based, literacy-focused early childhood education and parenting education curricula in Even Start programs on child language, literacy, and social competence, parenting skills, parent literacy, and instructional practices in Even Start, including: a comparison of the impacts of preschool, parenting, and parent-child curricula with the impacts of existing Even Start services; and an examination of the value added by parenting and parent-child curricula to preschool curricula