Recent Developments in Early Intervention Efficacy Research

Abstract
Contemporary developments concerning the effectiveness of family involvement in early intervention programs are described within the framework of P.L. 99-457 and illustrated with recent investigations focusing on children at biological risk, those with cerebral palsy, and children with general developmental delays. Studies emphasizing parental involvement are discussed in the context of the quality of research, the application of contemporary developmental principles, and the specificity of the experimental designs and approaches. The research and public policy implications of efficacy research following the implementation of P.L. 99–457 also are discussed.