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The health of hospital workers, nurses and nurse-aids constitutes a public health challenge for three reasons: maintenance of personnel at work in a context in which many express their desire to quit their jobs, protection of their health, and maintenance of quality of care.ORSOSA (ORganisation des SOins et SAnté des soignants) is a multidisciplinary interventional population health research programme designed to improve quality of life in the workplace of healthcare workers. This programme is designed to develop a tool to diagnose psychosocial and organisational work factors (POWFs) and mechanical constraints (MC), and then to implement this method in primary prevention interventions. ORSOSA consists of two steps: research (ORSOSA 1) and intervention (ORSOSA 2). In ORSOSA 1, a prospective cohort of healthcare workers was developed to construct and validate the diagnostic tool of work-related constraints at the work unit level. ORSOSA 2 consists of using the tool to implement both a collective and consensual dynamic based on collective restitution of the strengths and weaknesses of the work unit in order to propose recommendations for better quality of life at work.ORSOSA is now deployed in 4 teaching hospitals (Lille, Bordeaux, Grenoble and Strasbourg), each with 5 peripheral hospitals. Evaluation and follow-up of the programme is ongoing.