Purpose: Research underscores how autonomy and decision-making involvement may help to enhance the quality of life of older adults; however, individuals with dementia are often excluded from decision making that is related to their daily functioning. In this study we use a modified version of the Stress Process Model to consider the stress process of individuals with chronic illness, and in particular to explore the predictors of decision-making involvement among individuals with dementia (n = 215). Design and Methods: We collected data from individual with dementia (IWD)-family caregiver dyads. Relying primarily on data from the IWD, we used hierarchical multiple regression analysis to determine the predictors of the IWD's decision-making involvement. Results: Results indicate that individuals who report more decision-making involvement are younger, female, have more education, have a nonspousal caregiver, have fewer months since their diagnosis, exhibit fewer problems with activities of daily living and fewer depressive symptoms (based on caregiver report), and place more importance on autonomy/self-identity. Implications: In our discussion we examine the importance of autonomy and impairment levels for understanding the decisionmaking involvement of persons with dementia.Key Words: Autonomy, Daily functioning, Impairment, Stress process, Well-being Approximately 24 million people in the world have dementia, and the leading cause of dementia is Alzheimer's disease (Alzheimer's Disease International, 2006). In the United States it is estimated that 4.5 million people have Alzheimer's disease, and that the number of people with dementia is increasing (Alzheimer's Association, 2005). As the prevalence of dementia increases nationally and internationally, social science research on individuals with the diagnosis of dementia (from here on referred to as IWDs) has also expanded. When social research about Alzheimer's disease and dementia flourished in the 1980s, practical difficulties were sometimes encountered that precluded involving IWDs in social science research. Some researchers argued that these individuals were unable to provide meaningful or reliable responses to quantitative research questions (Albert et al., 2001;Kerner, Patterson, Grant, & Kaplan, 1998). At the same time, there was a growing body of qualitative research and anecdotal evidence that noted IWDs' ability to share insights and make decisions about how to live their lives (Davis, 1989;McGowin, 1993;Menne, Kinney, & Morhardt, 2002;Sabat & Collins, 1999). These differing opinions on the ability of IWDs to be involved in research and in their own care planning remain a matter of debate. In addition, writings about quality of life suggest that the autonomy and decision-making preferences of frail older adults are important factors when it comes to understanding an individual's quality of life (Lawton, 1991;Wetle, 1991).One area of research that examines the involvement of IWDs in making decisions concerns advanced directives and whether or not an ...