Valid and reliable assessment tools to test wheelchair service personnel/provider knowledge are needed to support good practice. The International Society of Wheelchair Professionals' Basic Manual Wheelchair Service Provision Test (Version 1) has been widely used across contexts and settings to assess the knowledge of personnel who provide manual wheelchair services. Test Version 2 has been recently developed according to current evidence. The objectives of this study were to assess the internal consistency reliability and construct validity for the Test Version 2. A convenience sample of 156 test-takers completed an online test with 170 multiple-choice questions. Internal consistency was measured using Cronbach's alpha, which ranged from 0.58 to 0.91 across different domains. Most questions (55.9%) were classified as "easy," while 28.2% were "medium" difficulty. Regression analysis showed that test-taker characteristics, particularly years of experience, explained nearly half of the variation in test scores (R