Comprehensive school health is considered a part of the community health because healthy children lead to healthy adults and communities. Schools keep an eye out for children with health issues, and if the problem is communicable, health authorities are notified. Schools are often the first sign of a problem or the first line of defense. A community's health depends on a "state of physical, mental and emotional well-being" as defined by the World Health Organization, not just the absence of disease. Where else is it so easy to evaluate the health of a whole section of the community? Skills to promote well-being can be taught and then used by the individuals to keep themselves and the whole community within the state of comprehensive health.