This paper examines the inter-rater reliability of 148 persons with traumatic brain injury (PwTBI) and their significant others (SO) on the Functional Independence Measure (FIM), and the Community Integration Questionnaire (CIQ). Results reveal that agreement differs across instruments and subscales, with greatest response comparability on the productivity CIQ subscale, followed by the motor FIM, social integration CIQ, cognitive FIM, and home integration CIQ. These findings have important implications for the future of TBI outcomes studies.