Making changes within existing systems, such as improving school health programs and policies, can effectively improve the health of many in the community. For a community to improve its health, its members must often change aspects of the physical, social, organizational, and even political environments in order to eliminate or reduce factors that contribute to health problems or to introduce new elements that promote better health. Changes might include: Instituting new programs, policies, and practices. changing aspects of the physical or organizational infrastructure, changing community attitudes, beliefs, or social