The initial psychometric properties of the Assessment for Dual Diagnosis (ADD), a new scale designed to screen for psychopathology in individuals with mild and moderate mental retardation, was examined. The ADD was found to have high stability across raters, high stability over time, and good internal consistency. (Author/DB)

This article outlines problems associated with large mental hospitals, describes how knowledge gained from these problems can be used to create alternative treatment programs, and introduces the papers in this special issue on community-based treatment programs for individuals with developmental disabilities. (JDD)