. For a visibility of the subjects of health as a human right/common good. In order to make the many populations of the national health service visible and to produce data that can be used as a guide for health planning, the fragmentation currently present in the databases, prevents the cross-communication and should be overcomed. Social, economical and health indicators should help to shape subgroups of populations and their needs, to render visible the problems (met and unmet) at community level. The critical step is the move from an epidemiology limited to the description of population problems to one that allows to highlight problems' avoidability.