biostudies-literatureUnknown149(Suppl 5)Ozer EJWe provide an overview of diverse forms of youth participation, with a focus on youth participatory action research (YPAR) and its synergies with life course intervention research to promote healthier development for young people and across the life span. We analyze why YPAR matters for research, practice, and policies related to the systems and settings in which young people develop. We also illustrate how young people perform YPAR work to improve the developmental responsiveness and equity of school and health systems, including descriptions of an innovative youth-led health center in Rwanda and a long-standing and evolving integration of YPAR into public high schools in the United States. We then briefly consider the adult capacities needed to do this work well, given that YPAR challengPediatricse2021053509Hhttps://www.ebi.ac.uk/biostudies/studies/S-EPMC9847417biostudies-literatureToward Integration of Life Course Intervention and Youth Participatory Action Research.PMC9847417Ozer EJPrata NAbraczinskas MSprague Martinez LVilla BfalseToward Integration of Life Course Intervention and Youth Participatory Action Research.We provide an overview of diverse forms of youth participation, with a focus on youth participatory action research (YPAR) and its synergies with life course intervention research to promote healthier development for young people and across the life span. We analyze why YPAR matters for research, practice, and policies related to the systems and settings in which young people develop. We also illustrate how young people perform YPAR work to improve the developmental responsiveness and equity of school and health systems, including descriptions of an innovative youth-led health center in Rwanda and a long-standing and evolving integration of YPAR into public high schools in the United States. We then briefly consider the adult capacities needed to do this work well, given that YPAR challeng2022-01-01T00:00:00Z2022 May2025-04-04T08:06:33.692Z2025-04-04T08:06:33.692ZS-EPMC98474173550332210.1542/peds.2021-053509H10.1542/peds.2021-053509h