In the vast majority of cases, the person of trust (or contact person) is not designated by the patient (emergency, severe disease situations, coma, sedation, etc.). The healthcare team thus identifies a person who 1) may not be the person the patient would have designated and 2) may not be the most suitable to take on this responsibility. Though the first point is not easy, the main difficulty for the clinician is to know if he is dealing with the "right person for the job", meaning a person who is able to take on the responsibility of the contact person. This is a heavy responsibility in terms of the information given, of passing on this information to relatives and friends, of consulting the doctors, of help or support in medical decisions, etc. This responsibility may also be difficult for one person alone to take on and it may be helpful to share it between several friends or relatives. In a princeps study (QUENOT, 2015), it was shown that the process used by the healthcare team to designate a contact person was based on criteria such as knowledge of the wishes and values of the patient, the strength of the relationship with the patient, and the person of trust designated before admission to the ICU. However, we do not know what criteria are used by the patients themselves or those used by their close friends and relatives. This study will make it possible to determine and to measure the possible differences between the criteria used by the ICU healthcare team (REPERE I), those used by patients (REPERE III) and finally, those used by close friends and relatives (REPERE II).