- To conduct semi-structured interviews with 30 parents/legal guardians of individuals who have global cognitive impairment as described in the primary objective in order to explore the general concept of their child's neurocognitive functioning, to rank the relative importance of different neurocognitive functioning domains, to inform a strategy for communicating with children and adolescents with impaired neurocognitive functioning for PRO research, and to suggest a user-friendly interface to collect PRO data from cognitively impaired children and adolescents. Additionally, 10 parents/legal guardians of individuals at least average general IQ will be recruited for comparison.