This is one of the first books exclusively devoted to applying the theories, findings, and approaches used in work with nonretarded children to several types of retarded individual. The editors and contributors define the developmental approach and explore theoretical issues as they relate to retarded populations. Problems involving similar sequences of development, cross-domain relations, the environment, and motivation are all discussed. This significant volume demonstrates how data from nonretarded development relates to retarded populations and how findings from children with mental retardation enrich developmental theory.