Usability evaluation of an electric-powered wheelchair driven by eye tracking

Studies indicate an increase in the abandonment rates of the use of Assistive Technology devices for several reasons: the non-participation of the user in the development of the technology, the lack of training and the non-adaptation of the device to the needs of users are the most reported complaints. In this context, this research aims to understand how users and developers (engineers and programmers) deal with Assistive Technology devices and whether the usability of a device can influence abandonment rates. We developed an electric-powered wheelchair system driven by eye tracking, and we performed usability tests (empirical and analytical evaluation methods) of this Assistive Technology device. The developed device was evaluated by two groups of volunteers: seven (7) developers with experience in Assistive Technology and five (5) users with severe motor disabilities. The participants found many usability issues in the developed system. We also realized that developers and users think differently about the development requirements of the device. Thus, it is possible to suggest that there is a need for discussion between developers and users before the development of an assisted device. Prior to the development of an Assistive Technology device, it is important to consider the opinion and point of view of users and developers. Following this path increases the chances that an assisted device will have a satisfactory usability evaluation and, consequently, user acceptance. In addition, there may be a decrease in abandonment rates on Assistive Technology devices.