PRIMARY OBJECTIVE: This paper investigates the test-re-test reliability of the Self-Awareness of Deficits Interview (SADI) for assessing level of self-awareness in clients with traumatic brain injury (TBI). RESEARCH DESIGN: Twenty rehabilitation clients with TBI were interviewed using the SADI and re-test interviews were conducted 2-4 weeks later. METHODS AND PROCEDURES: Two checklists were used to collect collateral information on the client from significant others and rehabilitation staff. This information was used to assist in assigning SADI scores. MAIN OUTCOMES AND RESULTS: High test-re-test reliability was demonstrated for both total (ICC = 0.94) and sub-section scores (ICC = 0.85, 0.86 and 0.86). The results, combined with previous research indicating the high inter-rater reliability of the SADI, suggest the SADI is a reliable means of evaluating level of self-awareness. Further research is required to investigate other psychometric properties of the SADI and the two checklists.