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In this comprehensive text, students examine both the scope and inner workings of the public health system. They will develop a clear understanding of the role of the public health system in the US today, and how that role has evolved over time, the various facets of the public health system that link its essential ingredients to its intended outcomes, the relationships between public health and medical care in the health care delivery system and how the performance of the public health system can be measured, and more importantly, improved. A wide range of activities that makes up the public health system are addressed -- epidemiological investigation, biomedical research, environmental assessment, the analysis of individual and group behavior, massive data collection efforts, policy department, and more