Qualified companies have Rehab Technology Suppliers (RTSs) on staff who have been certified by the National Registry of Rehabilitation Technology Suppliers (NRRTS) and the Rehabilitation Engineering and Assistive Technology Society of North America (RESNA). These seating and mobility professionals must pass rigorous testing and have several years of experience in the industry. Ask the wheelchair providers you are considering for their credentials or contact one of the credentialing agencies www.NRRTS.org or www.RESNA.org for certification requirements.