GAGE’s longitudinal research design blends quantitative, qualitative, and mixed methods data, to provide insight into the social and structural determinants of adolescent wellbeing over time and identify what type of policies and programmes work to support adolescents at distinct developmental junctures.

GAGE longitudinal data offers long-term evidence on adolescents, including information about the structure, breadth, and timing of interventions that tackle multidimensional complexities; and, by oversampling marginalised adolescents, seeks to improve understanding of the
intersectional vulnerabilities experienced by adolescents with disabilities, ever-married girls, young mothers, those who are not in school, and refugees. GAGE thinkpieces also include reflection on longitudinal research potential, and on how to build trust with young people over time and ensure that ethics of care and connection are exercised over time.