Project Summary/Abstract: Alzheimer's disease and Alzheimer's disease-related dementias (AD/ADRD) relentlessly erode affected individuals' decision-making abilities. As these abilities decline, persons with AD/ADRD often engage another person, typically their care partner, in decision making. In clinical encounters, the addition of a third party, the clinician, further complicates communication and decision making. There is a critical need to identify interventions with the potential to improve dyadic and triadic communication. Supported decision making is such an intervention. In supported decision making, an adult with impaired decisional abilities enters into a structured agreement with another person; this agreement identifies domains in which the adult with impaired decisional abilities needs and wants decision-making help, and it specifies the kinds of help sought. This agreement then guides the supported decision-making process. For example, based on the agreement, this other person may talk through the pros and cons of various treatment options to aid the adult with impaired decisional abilities in reaching a decision. Supported decision making acknowledges the potential vulnerabilities of persons with impaired decisional abilities while also promoting their ability to engage in self- determination and, in turn, their wellbeing. Supported decision making is increasingly being used with young adults with intellectual and developmental disabilities (I/DD) who reach the age of majority (i.e., are no longer minors under parental care), and evidence suggests that supported decision making promotes their wellbeing. Moreover, many states are beginning to recognize supported decision making as an option for persons with impaired decisional abilities. Yet, no extant supported decision-making resources are AD/ADRD-specific, and there is a lack of evidence on the outcomes of supported decision making for persons with AD/ADRD, their care partners, or clinicians. In Aim 1, we will modify existing supported decision-making tools for use in AD/ADRD with input from Delphi panelists including patients, care partners, clinicians, and experts in consent, capacity, and supported decision making. In Aim 2, we will interview patients, care partners, and clinicians to understand the attitudinal, normative, and self-efficacy beliefs associated with greater intention to use the AD/ADRD-specific supported decision-making toolkit, as well as perceived barriers to its use. In Aim 3, we will pilot test the AD/ADRD-specific supported decision-making toolkit with patients, care partners, and clinicians at the Penn Memory Center and assess decision making following delivery of the intervention relative to usual care. In order to develop potent, scalable behavioral interventions to meet the medical decision-making needs of the millions of Americans with AD/ADRD, we must increase our understanding of the mechanisms underlying supported decision making and assess its abili...