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Twenty years has passed since hospital information system was introduced in 1980. Large amount of data, including histories of clinical actions and results are available, waiting for analysis and reuse for improving quality of medical service delivery. In this paper, we showed analytical results based on data mining and exploratory data analysis in which temporal behavior of hospital activities are visualized. Each case study shows the reuse of stored data will give a powerful tool for hospital management and lead to improvement of hospital services.