Inclusion Criteria:  For the focus group phase:  Patients  Adult patients (≥ 18 years of age), volunteers with end-stage renal disease (ESRD) treated by dialysis in the study centers Individuals who have received complete information on the organization of the research and who have not objected to their participation and to the use of their data Person with internet access and a computer tool such as a tablet, computer or smartphone  Health professionals - Volunteer healthcare professionals in the participating departments (CHRU Nancy, ALTIR, CHU Nîmes) with at least 3 months experience in a dialysis department  For the test phase of symptom collection in dialysis services:  Adult patients (≥ 18 years of age), volunteers with end-stage chronic kidney disease (ESRD) treated with dialysis for at least 3 months in the study participating centers Person who has received full information on the organization of the research and has not objected to his or her participation and to the use of his or her data Patient able to answer a self-questionnaire Person with internet access and a computer tool such as a tablet, computer or smartphone Person able to use a computer tool such as a tablet or smartphone Person affiliated to a social security system  Exclusion Criteria:  The non-inclusion criteria for the focus group phase are as follows :  Patients  Non-dialysis patient Dialysis patient in retreat at the facility Patient dialyzed for less than 3 months Non-voluntary patient Minor patient Patient who does not speak French Person placed under judicial protection, guardianship or curatorship  Health Professionals  - Non-voluntary health professional  The non-inclusion criteria for the test phase of the collection are as follows:  Non-dialysis patient Dialysis patient in retreat at the facility Patient dialyzed for less than 3 months Non-voluntary patient Minor patient Person placed under court protection, guardianship or curatorship