This unique book will open the reader's eyes to otherwise invisible relationships in public health systems, taking them all the way from the basics of a systems approach to complex structures. Not only will the reader learn how to use computer models to unravel the mysteries of government health policy, demography, or epidemiology, but the book also teaches how to build models to solve any problem of a complex nature. It covers selected problems in detail from topics, such as epidemiology, pharmaceutical business, government regulatory policy, health care provider staffing, capacity planning, vaccination, and national health policy.