The Violence Against Children Study (VACS) is a global effort to collect data on violence against children. The study monitors the prevalence of domestic violence, sexual violence, emotional violence, and exploitation. VACS aims to inform prevention efforts, policy regarding child safety, and the utilization of health services.  

Tanzania was the first nation in Africa to participate in VACS in 2009. Data were collected through a household survey and 8,693 households were visited. The study interviewed 1,968 females and 1,771 males between the ages of 13 to 24 years from mainland Tanzania and Zanzibar. The study split the sample into two age groups: participants 18 to 24 years and participants 13 to 17. The older group was canvassed for experiences of violent acts prior to age 18. The younger group was asked to recount experiences that had occurred in the 12 months preceding the survey.