Young Lives is a longitudinal study that has been following children in Ethiopia, India, Peru and Vietnam since 2002 to understand the impacts of poverty. It aims to generate high-quality evidence to influence pro-poor policies. Key themes include health, education, gender and child protection. Young Lives works to build research capacity, disseminate findings, promote evidence uptake by policymakers, and innovate methodology. Case studies show how Young Lives research has contributed to programs like Ethiopia's Child Research and Policy Forum and Peru's Juntos conditional cash transfer program.