“…Improving performance, accountability, and value of the public health system is complicated by the nature of the system because it is composed of a variety of very different organizations, each with different structured activities and the capacity to deliver services (60). Reviews of more than 90 years of effort to measure, describe, and improve public health practice and systems performance (82,94) show that many of the same basic challenges for measuring systems performance persist. In addition, new and re-emphasized priorities in public health practice, such as voluntary agency accreditation (46,58,72,91), workforce credentialing (12,16,23,68), quality improvement (74,75,85), and service value measurement (36,43,66), will increase expectations for PHSR science to integrate and understand effects of these efforts at multiple systems levels.…”