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Research on methods to enhance and remediate the communication and language development of children with mental retardation and developmental disabilities has been ongoing since the early 1960s. Scores of studies have been conducted over this time period, the vast majority aimed at testing various procedures or intervention ‘‘packages’’ with relatively small numbers of children for very limited periods of time. This ‘‘technology building’’ period is gradually receding and the framework of a developmental model of early communication and language intervention is emerging. This model supports the use of different intervention approaches at different points in a child’s development. The purpose of this paper is to describe the basic framework of this emerging model, to provide an overview of the research findings that support it, and to identify high priority areas for further investigation. r 1997 Wiley-Liss, Inc. MRDD Research Reviews 1997;3:358‐362.

Down syndrome (DS) is associated with abnormalities in multiple organ systems and a characteristic phenotype that includes numerous behavioral features. Language, however, is among the most impaired domains of functioning in DS and, perhaps, also the greatest barrier to independent meaningful inclusion in the community. In this article, we review what is known about the extent, nature, and correlates of the language and related problems of individuals with Down syndrome. In doing so, we focus largely on the syndrome-specific features of the language phenotype, although we also consider within-syndrome variation. The review focuses on the prelinguistic foundations of language and the major components of language (i.e., vocabulary, syntax, and pragmatics). We also consider two topics in the treatment and education of individuals with DS: prelinguistic communication intervention and the acquisition of literacy skills.

Research over the past 50 years has yielded several promising approaches and many specific intervention techniques designed to enhance the communication and language development of young children with intellectual and developmental delays and disabilities. Yet virtually no systematic research has been conducted on the effects of different treatment intensities. We review how intervention intensity has been defined in the literature and propose a set of terms borrowed from medicine that are intended to capture the dynamic aspects of this concept as an aid to further investigation. On the basis of this approach, we propose four types of knowledge that can be generated through the systematic study of treatment intensity and discuss appropriate methods for investigating the effects of differential treatment intensities. We conclude with three recommendations for the field.