Using a straightforward systems approach, Public Health: What It Is and How It Works explores the inner workings of the complex, modern U.S. public health system-what it is, what it does, how it works, and why it is important. It covers the origins and development of the modern public health system; the relationship of public health to the overall health system; how the system is organized at the federal, state, and local levels; its core functions and how well these are currently being addressed; evidence-based practice and an approach to program planning and evaluation for public health interventions; public health activities such as epidemiological investigation, biomedical research, environmental assessment, policy development, and more. Transition to the New Edition! Click here to access our transition guide-and make changing your course materials from the third edition to the fourth edition as easy as possible! The Fourth Edition is a thorough revision that includes: The latest developments with public health agency accreditation, pu...