Research on language and communication development and intervention in persons with mental retardation has been conducted at a fast and furious pace during the last two decades. Past attempts to summarize this research have been rather restricted, focusing on a single, narrowly defined substantive domain such as lexical development, or of a single etiology such as Down Syndrome. br br This volume, in contrast, presents a critical, integrative review of research and theory on language development and processing across all domains and a variety of etiologies. In addition, many previous attempts...