A major source of data for health assessments. The identification, review, and evaluation of health outcome parameters is an interactive process involving the health assessors, data source generators, and the local community. Health outcome data should be community-specific and may be derived from databases at the local, state, and nations levels, as well as data collected by private health care organizations and professional institutions and associations. Databases to be considered include morbidity and mortality data, birth statistics, medical records, tumor and disease registries, surveillance data, and previously conducted health studies. Relevant health outcome data play an important role in assessing the public’s health and in determining which follow-up activities are needed.