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The multidimensional assessment carried out with interRAI tools constitutes an operationalization of the International Classification of Functioning, Disability and Health (ICF) and is adapted to the specificities of each place of care. From a single assessment, the interRAI approach makes it possible to conduct a multidimensional assessment of functional autonomy and to produce a series of indicators (health, areas of intervention, quality of care, and consumption of resources). It helps to identify the clinical needs that should be the focus of a personalized care plan and to highlight health organizations’ strengths and weaknesses to improve their professional practices. Compared to standardized geriatric assessment, interRAI tools take into account the person’s expectations and resources, offer a common language, produce a multidimensional synthesis, and facilitate the construction of an integrated information system. The basis for their development is evidence-based scientific thinking.