This booklet provides an overview of Alzheimer's disease along with a description of the disease, how to find out if someone has it, and how it affects adults with developmental disabilities. It also provides information on what to do and suggests where to seek help. Specific sections discuss: (1) the etiology of the disease; (2) symptoms of Alzheimer's disease; (3) the general course of the disease; (4) other conditions that produce the same symptoms; (5) risk factors for Alzheimer's disease or dementia among people with developmental disabilities; (6) personal stories of individuals with mental retardation and Alzheimer's disease; (7) Down syndrome, aging, and Alzheimer's disease; (8) diagnosis of Alzheimer's disease; (9) places to go to be evaluated for the disease; (10) steps beyond diagnosis; (11) other concerns, such as how to serve people with Alzheimer's disease with dignity, how to help adults with the disease to "age in place," and how to prevent or defer changes in residence; and (12) resources for families and caregivers, including home care services, adult day care, respite, hospice, financial or legal aid, and local support groups. A list of resource organizations and a glossary of terms are also provided. (CR)