RT Article T1 A Methodology Report for the Life’s Snapshot Cohort Study to Investigate the Long-Term Efficacy of a Violence Intervention JF Violence against women VO 28 IS 1 SP 316 OP 344 A1 Coker, Ann L. A2 Bush, Heather M. A2 Brancato, Candace A2 Huang, Zhengyan A2 Clear, Emily R. A2 Follingstad, Diane R. LA English YR 2022 UL https://krimdok.uni-tuebingen.de/Record/177623152X AB Engaged bystander interventions are recognized as “promising” programming to reduce sexual violence (SV), yet little is known of the long-term (>12-month) impact of programming on SV and related forms of gender-based violence. Funded by NIH as a prospective cohort study, Life’s Snapshot recruited and followed three waves of high school seniors who had participated in a large high-school cluster-randomized controlled trial to evaluate the effectiveness of the Green Dot bystander intervention. This report provides the study design, recruitment methodology, recruitment and retention rates, survey items, and psychometric properties of measures included in the initial and annual electronic surveys with 24–48 months follow-up. K1 Prospective cohort K1 Methodology K1 bystander intervention K1 Sexual Violence K1 Teen Dating Violence DO 10.1177/1077801221992871