Objective: To develop and test face and content validity, and user interface design of a rehabilitative care patient experience measure.; Design: Mixed methods, cross-sectional validation study that included subject matter expert input. Cognitive interviewing tested user interface and design.; Setting: Outpatient rehabilitative care settings.; Participants: Subject matter experts (n=3), health care providers (n=137), and patients and caregivers (n=5) contributed to the question development.