Experiences of adolescence are diverse and changing fast in Ethiopia, a country with the highest proportion (22 per cent) of 15 - 24 year olds in the world. Young Lives research has shown that adolescence provides a second crucial window of intervention to improve children's opportunities and well-being. Yet in Ethiopia there is insufficient investment in development interventions designed to support this age group. This brief, produced in partnership with UNICEF, draws on evidence from Young Lives and offers a range of measures to address this gap. It is part of a series that explores transitions from childhood to young adulthood in Ethiopia.