This book offers a critical overview of participatory methods in health research with adolescents and youth. It introduces participatory methodology as an ethos and practice, before covering specific paradigms and methods, including participatory action research, community-based participatory research, co-design, co-creation, participatory design, peer research, youth as researchers, integrated knowledge translation, and youth-adult partnerships. Specific technologies are also covered, such as mobile apps and video games, sonification, photovoice, visual mapping, and Internet-based approaches. A guidebook to both theory and methods, it demonstrates technology's potential to drive impactful research and inclusive study design.