Gender and Adolescence: Global Evidence (GAGE) is a ten-year (2015-2025) research programme, funded by UK Aid from the UK Foreign, Commonwealth and Development Office (FCDO), that seeks to combine longitudinal data collection and a mixed-methods approach to understand the lives of adolescents in particularly marginalized regions of the Global South, and to uncover 'what works' to support the development of their capabilities over the course of the second decade of life, when many of these individuals will go through key transitions such as finishing their education, starting to work, getting married and starting to have children.GAGE undertakes longitudinal research in seven countries in Africa (Ethiopia, Rwanda), Asia (Bangladesh, Nepal) and the Middle East (Jordan, Lebanon, Palestine). Sampling adolescent girls and boys aged between 10‐19‐year olds, the quantitative survey follows a global total of 18,000 adolescent girls and boys, and their caregivers and explores the effects that programme have on their lives. This is substantiated by in‐depth qualitative and participatory research with adolescents and their peers. Its policy and legal analysis work stream studies the processes of policy change that influence the investment in and effectiveness of adolescent programming.Further information, including publications, can be found on the Overseas Development Institute GAGE website.  Gender and Adolescence: Global Evidence: Jordan Baseline, 2018-2019 recruited a sample of 4,101 adolescent girls and boys in two separate cohorts (younger adolescents aged 10-12 years and older adolescents age 15-18 years at baseline). GAGE surveyed the adolescents, as well as their adult female caregivers and, for those enrolled in formal schooling, conducted surveys at their schools. This sample includes Syrian refugees living in refugee camps, informal tented settlements (ITS) and host communities, as well as Palestinian refugees living in refugee camps and host communities, vulnerable Jordanian adolescents living in communities hosting refugees, and a small group of adolescents of other nationalities (Egyptian, Iraqi, and others) living in Jordan. The research sample was recruited during 2018 and 2019. Additional information about the sample and the baseline Jordan data are available in the GAGE Jordan Baseline Sample Overview and Data Use Manual (2021) included in the Documentation. Youth; adolescence; gender; longitudinal impact evaluation of youth programming