The Multicenter Inventory of Neonatal-Perinatal Interventions (MINI) study serves as a registry detailing outcomes and practices for all deliveries and infants admitted to intensive care at 22-23 weeks’ gestation at participating hospitals. Data collected in this study are used for real-time assessment of local perinatal care practices to serve as the basis for local changes/quality improvement. The study may identify “potentially better practices” requiring further evaluation.