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The California Health Plan for Children, 1979, compiled by the Committee on Health Planning of California, District IX of the American Academy of Pediatrics, is an extensive report on health problems unique to the children of California. Since its publication, many local and state health agencies have been using it as a guide and source of data in their planning efforts for child and youth health. The creation of the plan demonstrated a successful working relationship between health care practitioners and biostatisticians, the acceptance by health professionals of the use of health statistics in planning, the different uses of health statistics in formulating recommendations, and an approach to organizing and summarizing large bodies of data. Nevertheless, our experience indicates that although collection systems for data on population, mortality, natality, morbidity, and health services statistics abound, their use in community health planning for subpopulations is still limited by problems in the definition, validity, and completeness of the data elements. The establishment of an individualized data system for the entire population, to be developed, coordinated, and controlled by one central agency, could be a significant step toward solving these long-standing problems in our data systems.