INTRODUCTION:The prescription of powered mobility devices for clients is an important role for occupational therapists. However, the skill of may powered mobility device users to drive their devices remains unknown and clients are provided with only brief education on their use. Few assessments exist to guide mobility device use assessment, and none of these incorporate the training clients need. The aim of this paper was to investigate the inter-rater reliability of a new assessment and training tool called the Powered Mobility Device Assessment Training Tool (PoMoDATT). METHOD:The PoMoDATT comprises an initial interview and then Part A- cognitive skills, Part B physical and psychosocial skills and Part C driving skills and behaviours. The assessment outcome is a profile of the client's physical, cognitive and psychosocial skills related to powered mobility device use. The driving assessments of 24 powered mobility device users were video-recorded, and four experienced occupational therapists scored the clients on the 26 items of Part C of the PoMoDATT. RESULTS:Following clarification of three items which included re-scoring and data re-analysis, the inter-rater reliability for the PoMoDATT Part C items ranged from ICC (2, 1) 0.641 to 0.938 suggesting moderate to excellent agreement. CONCLUSIONS:The PoMoDATT Part C has demonstrated adequate inter-rater reliability to support its use by occupational therapists to assess powered mobility device user's capacities and abilities and to highlight ongoing training needs.