Research findings from a series of longitudinal studies of the language, speech, and social-emotional development of children with hearing impairments and hearing parents found language development is positively and significantly affected by the age of identification of the hearing loss and age of initiation into Colorado early intervention…

This report is the fourth in a series of follow-up analyses of nine longitudinal studies addressing the costs and effectiveness of alternative types of early intervention for children with disabilities. An introduction provides an historical perspective and conceptual framework for the studies, including common study elements and how research…