The Zurich Project on the Social Development from Childhood to Adulthood (z-proso) is a prospective-longitudinal study that was launched in 2004 in response to the need for a better evidence base to support optimal child social development and prevent crime and violence. Since then, the study has explored the life course of a cohort of 1,675 children in the target population from age 7 (n = 1,360) to age 24 (n = 1,160), with primary data collection waves at ages 7, 8, 9, 10, 11, 12, 13, 15, 17, 20, and 24 (see Ribeaud et al. 2022, https://doi.org/10.1007/s40865-022-00195-x, for the sampling procedure). The study has been built on multi-method, multi-informant design that combines child/youth/young adult, teacher, and parent surveys. The large and ethnically diverse sample, the dense sequence of assessments with multiple-informant data, the high retention rate, and the combination of measurement domains make z-proso an important resource for innovative research nationally and internationally. z-proso project website: https://www.jacobscenter.uzh.ch/en/research/zproso.html