The effects of room management and small groups procedures on the behavior of five older adults with Alzheimer's Disease was experimentally evaluated by a multielement design with replications across five subjects. Engagement during both room management and small groups was higher than during no treatment baselines. The effects on affective and maladaptive behaviors were of small magnitude. Evidence of individual differences was found both with respect to absolute proportions of time spent in various behaviors and with respect to interactions between individual differences and experimental conditions.Behavior therapy has developed a range of principles to analyze and modify environments for populations who often show high levels of dependency and low levels of independent behavior. Studies have included young children, people with mental retardation, people with long-term psychiatric disorders, and older adults. Typically, such studies have been conducted in settings where groups of individuals are cared for or taught, such as wards, hostels, or classrooms (Twardosz, 1984). This paper examines the application of environmental design to older adults who have Alzheimer's Disease.Several papers have indicated that hospital wards and day services for older adults are often characterized by low levels of activity (Felce, Powell, Lunt, Jenkins, & Mansell, 1980;Lunt, Powell, Jenkins, & Felce, 1976;McFadyen, 1984;Jenkins, Felce, Powell, & Lunt, 1978). A series of papers by Baltes and her colleagues indicate that these low levels of activity may arise due to carestaff differentially responding to client dependent behavior and extinguishing