Pain is described by patients with a Neurodevelopmental Disorder (NDD), including Autism Spectrum Disorder (ASD), Intellectual Development Disorder (IDD) or multiple disabilities, and the family as one of the main associated disorders; its management is also one of the main concerns of families and professionals. At present, there is no validated and tested pain management system in populations facing complex pain situations. In response to the lack of a pain management services, a multi-disciplinary mobile team was set up in September 2022 at the Brest University Hospital (Mobile Pain Handicap Team Intellectual Disability 0-25 years; MoDIDol). This team offers a specific protocol for the assessment and management of pain that takes into account the social and family environment, the living context and the clinical characteristics of patients (children, adolescents and young adults (0-25 years) with IDD, ASD or multiple disabilities). The team includes at least one paediatrician specialising in the assessment and treatment of pain and a nurse, and travels to patients' usual living environments.