Both the medical care and public health systems have invested considerable resources to define, measure, and improve quality and health outcomes. A movement toward accountability has generated performance indicators from the medical arena and "leading health indicators" from the public health arena. The focus on specific conditions by the medical care system has been at odds with public health's emphasis on improving population health and has perpetuated a bifurcated system. Aligning the goals of medical care with those of public health will require reformulation of performance measurement and accountability into a common language that is valued by both systems. Such a creation would amount to a whole that is stronger than the sum of the component parts.