This visit is followed by a telephone contact at study week 8 and the Outcome Assessment Visit at study week 10. At that visit participants and caregivers complete assessments of physical health, cognition, neuropsychiatric status, everyday functioning, community participation, quality of life, and caregiver appraisal. After completion of all week 10 assessments, the extent to which participants and their caregivers remained blinded to study condition (allocation concealment) will be evaluated by inquiring whether they believe they received donepezil or placebo. Study staff also will offer a written opinion on the study condition to which each participant was assigned.