Clients  Inclusion Criteria:  (1) The care management specialist or case manager of the A-level unit (community integrated service center) or the B-level unit (combined service center) judged to be an effective professional service user who has reached the age of 20 (e.g. : Decline in the level of disability, decrease in the number of hours of care required, decrease in the burden of caregivers, etc.) and their family members or main caregivers. (2) The cognitive status and language ability of professional service users are acceptable for face-to-face (or video) interviews. If the professional service user is a case where a research team such as a dementia patient determines that the cognitive state cannot be interviewed, it will be replaced by interviewing the long-term professional service experience of the family or the main caregiver. (3) Understand the research content and agree to accept the interview.  Exclusion Criteria:  N/A  Caregivers and professionals  Inclusion Criteria:  (1) The main caregivers of professional service users who have reached the age of 20, and their cognitive and language skills are acceptable for face-to-face (or video) interviews (2) Relevant professional service providers (including but not limited to: case managers, care managers, occupational therapists, physiotherapists, nurses, home care service supervisors, caring service supervisor, home service assistants, etc.) (3) Understand the research content and agree to accept the interview.  Exclusion Criteria:  The cognitive status and language ability of the main caregivers in the families of professional service users are not acceptable for face-to-face interviews.