Alzheimer’s disease (AD) is the leading cause of dementia in the USA and worldwide. In this article, we have discussed the incidence of dementia, especially Alzheimer's disease dementia, and its familial association, according to the latest reports. There is a menu of instruments discovered in past decades for the behavioral, cognitive and functional assessment of an AD person. Behave-AD, E-BEHAVE-AD, E-BEHAVE-AD FW, Neuropsychiatric inventory are discussed in detail, in view of the researches conducted in their context. Global deterioration scale (GDS), Brief cognitive rating scale (BCRS), Mini-mental state exam (MMSE), Functioning and self-care (FAST) and other tools are used in the cognitive and functional assessment of an AD person. We threw light on the pros and cons of utilization of these divergent tools.