This comprehensive introduction to mental retardation is strongly based on the stages of human development. It provides an interdisciplinary perspective regarding aspects of diagnosis and intervention. Expands treatment of multicultural issues related to assessment bias, language differences, and mental retardation. Includes current research findings regarding infants, toddlers, adults, and senior citizens with mental retardation. Considers changes in the field, topics associated with new knowledge, and shifts in society's views. For people working in special education, psychology, rehabilitation, and social work.