Project Summary/Abstract The K23 application describes the background and experience of Dr. Jiayun Xu, PhD, RN, and her research and training plan to become an independent nurse researcher in the field of dyadic advance care planning interventions among persons with serious illness and their families (e.g. Parkinson’s disease). The overall goal of the K23 is to gain experience in designing and testing clinical trials, learn about different models for advance care planning (ACP) facilitation, and gain skills to conduct advanced dyadic and longitudinal analysis of data. A comprehensive training plan has been developed with an interdisciplinary mentorship team with the following training goals: (1) develop competency in the design and delivery of dyadic ACP communication interventions among persons with Parkinson’s disease and their caregivers; (2) acquire expertise in ACP communication models that can be applied to persons with Parkinson’s disease and their caregivers; and (3) develop skills in analyzing complex dyadic data using longitudinal and multilevel statistics. The training plan includes intensive one-on- one mentorship, coursework/workshops, formal training on clinical trials and advance care planning facilitation, and independent studies on advance care planning and longitudinal statistics with mentors. The purpose of the K23 project, is to develop, refine, and test the feasibility of a novel dyadic ACP intervention tailored to the unique needs of people with Parkinson’s disease and their caregivers. The specific aims are: (1) to identify the dyadic advance care planning needs for Parkinson’s disease, (2) develop and refine dyadic Parkinson’s disease-specific ACP materials, and (3) pilot test the dyadic Parkinson’s disease-specific ACP materials with an established intervention – PREPARE – for feasibility and acceptability. Results will lead to a R01 application for translating the intervention from pilot testing to a fully powered randomized control trial.