Cognitive disability entails a substantial limitation in one's capacity to think, including conceptualizing, planning, and sequencing thoughts and actions, remembering, interpreting subtle social cues, and understanding numbers and symbols. Cognitive disabilities include intellectual disabilities and can also stem from brain injury, Alzheimer's Disease and other dementias, severe and persistent mental illness, and, in some cases, stroke (see Figure 1). More than 20 million persons in the United States have a cognitive disability -- and the number of individuals with cognitive disabilities such as Alzheimer's disease is expected to increase rapidly as the nation's population ages (Braddock, 2001).