The availability of knowledge and information in high-tech sectors with strong economic implications such as the health service, is regarded as absolutely critical for guaranteeing reliable decision-making. Starting from the concrete experience of their work in epidemiological research in various field of care (involving extensive data use), the authors propose (and document with concrete scenarios) a different reading of the problem: data can only be misleading or irrelevant if it is not linked up each time and interested in terms of an explicit project of health as a right. only subscribers can see the full article