Identify the Benefits CAREGIVERSPRO-MMD Platform Use Based on the Information and Communications Technology, Dedicated to the Support and Assistance of Dyads Living With Neurocognitive Diseases and Their Primary Caregivers

Inclusion Criteria:

• For patients People, aged 50 and over, living in the community, who are able to giveinformed consent.

Diagnosed with mild cognitive impairment (MCI) according to Petersen criteria or mild to moderate dementia diagnosed according on DSM-IV criteria.

Having a Clinical Dementia Rating (CDR) of 0.5 for MCI, 1-2 for mild to moderate dementia Having a Mini-Mental Exam score (MMSE) between 30 and 25 (inclusive) for MCI, and between 24 and 10 (inclusive) for dementia.

Having a primary caregiver, familiar (or not), informal (or not) identified and also included in the study.

Be willing to use Information Technology and Communications (ICT) according to the investigator criteria.

Affiliated to the social security system.

• For caregivers People, aged 18 years and over, with no diagnosis or no evidence ofmild cognitive impairment or mild to moderate dementia (according DSM-IV criteria),who are able to give informed consent and with an intention to complete the study.

Primary caregivers, informal (or not), familiar (or not), of person with mild cognitive impairment or mild to moderate dementia People with Internet access and basic knowledge and skills in managing internet and social networks, or keen to learn, according to the investigator criteria Having a Geriatric Depression Scale (GDS-Yesavage - 15 items) score less than 11 at the time of entry into the trial indicating no severe depressive symptoms or for people < 50 years a MADRS < 15 Having no specific conditions (evaluated by the investigator) reducing their physical abilities below the norm for their age that would limit or impair CAREGIVERSPRO-MMD platform use.

Be willing to use Information Technology and Communications (ICT) according to the investigator criteria Affiliated to the social security system

Exclusion Criteria:

• Terminal or severe illness with survival prognosis less than 18 months

• Not speaking nor reading French

• Enrolled in another clinical trial

• For the patients : Having delusions, hallucinations, behavioural disturbances, thatmay interfere with the use of Information and Communications Technology (ICT) tools ; Under guardianship and/or under curatorship