This chapter discusses current practice and opportunities to strengthen evidence-based approaches to policymaking and service delivery for children and young people in Ireland. It analyses capacity among government departments and agencies to collect, utilise and share evidence that is disaggregated by age and other identity factors and coordinate research within the framework of the Children and Young People (CYP) Indicator Set, with a focus on mapping the needs of vulnerable groups of children and young people. It also discusses the collection of evidence through involving children, young people, and civil society in policymaking, as well as the development of regulatory impact assessments to anticipate child and youth outcomes ex ante.