This model developed by the Association of State and Territorial Directors of Nursing (ASTDN) outlines the dynamic nature of public health nursing within the larger frameworks of the core functions of public health and the ten essential services of public health.
From: http://healthvermont.gov/local/public_health_nurse/PublicHealthNurse.aspx
The Institute of Medicine, which is part of the National Academy of Sciences, conducts research "to provide unbiased and authoritative advice to decision makers and the public." The following are links to some of the many reports they have generated. You can find even more on their website.