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State Perinatal Quality Collaboratives (PQCs) represent a major advance for scaling up quality improvement efforts for reducing maternal mortality and severe maternal morbidity. The critical roles of partners, rapid-cycle low-burden data systems, and linkage to maternal mortality review committees are reviewed. The choice of measures is also explored. California’s experience with its PQC, data center, quality improvement efforts, and promising results for reduction of maternal mortality and morbidity from hemorrhage are presented. Early data from other states is also shared.