Abstract: A method and system for tracking health care metrics over time is disclosed which involves aggregating health related data via computer in a common computer database, de-identifying persons in the data in the database to remove personally identifiable information (PII) and personal Health information (PHI), matching de-identified persons with the related data, analyzing the matched de-identified persons and related data to generate populations utilizing risk, condition, and appropriateness of care algorithms, stratifying the population into predefined groups, identifying opportunities for health improvement, disseminating the opportunities to the persons in the groups; and tracking the groups over time to ascertain success of the opportunities disseminated.