Objectives: Identify factors of informal caregivers, caregiving, and people with multiple sclerosis (MS) receiving assistance that are associated with perceptions of caregiver accomplishment. Methods: National data were collected in a telephone interview survey of 530 informal caregivers and analyzed using an ordered logistic regression model to identify factors associated with perceptions of caregiver accomplishment among 442 of these informal caregivers (caregivers providing all data in their survey responses needed for the regression model). Results: We found t