To assess the feasibility of a care system to prevent iatrogenic dependency during hospitalisation in people 70 years old and over. 2 cares units participate : one with routine care and the other with a care system to prevent ID. The caregivers of this unit receive training about iatrogenic dependency and how prevent it. They set up this prevention and the research compare evolution of dependence hospitalized patients.

inclusion criteria:

• Patient hospitalized for at least 48 hours in the participating center
• Persons affiliated to a social security system,
• The patient, his trusted person or a relative present during his hospitalization have not expressed opposition to his participation in the research..

exclusion criteria:

• End of life situation,
• ADL at 0/6 for 15 days before hospitalization.
• Refusal to participate,
• Patient under judicial protection