Contents : A productive experiment with administrative data ; A population-based health information system ; Measuring the health of the population ; Socioeconomic status and the health of the population ; Utilization of hospital resources ; Utilization of nursing home resources ; Utilization of physician resources for ambulatory care ; Stability and trends over 3 years of data ; Using the information system to assess change: the impact of downsizing the acute sector ; The population health information system: data analysis and software ; From research to policy: what have we learned from designing the population health information system?