Capturing the Complexities of Adolescent Transitions Through a Mixed Methods Longitudinal Research Design
Adolescence is a time of rapid change in the lifecycle, with significant shifts in physical, cognitive and psychological competencies, and major changes in social roles and expectations. However, our collective understanding of the patterning of these changes and the types of support young people require to reach their full human capabilities is still limited. Given that multiple Sustainable Development Goals rest on investments in adolescents (from goals on eliminating harmful traditional practices including child marriage and female genital mutilation to ensuring quality secondary, tertiary and technical and vocational education), investing in a more robust evidence base and improved measurement is critical. The Gender and Adolescence: Global Evidence (GAGE) research programme is a key initiative aimed at contributing to this evidence and measurement lacuna. This article discusses the design and methodological choices of the GAGE study, which is the largest longitudinal research initiative focused on adolescents (10-19 years) in the Global South, following 18,000 adolescent girls and boys in developmental and humanitarian contexts in sub-Saharan Africa, MENA and South Asia. It includes a discussion in line with the 2030 Sustainable Development commitment to leave no one behind of the programme’s purposeful sampling of advantaged adolescents.