Error-rate development for each selection strategy

Evaluating alternative selection strategies for assistive eyegaze technologies

Eye typing is essential for some severely disabled people to communicate. In collaboration with Tobii Technology this project aims to improve the usability of on-screen keyboards for eye typing by developing alternative selection strategies that would help to avoid inadvertent selection of buttons. Three selection strategies were developed and evaluated in a human-centred iterative design process using Tobii Communicator as a software platform. The models were based on a double-stage selection strategy with very short dwell-times   (2 x 250 ms) and were tested for usability. The Button-Split strategy was more successful in error-prevention than the standard dwell-time selection.  It gives users more control over the selection process and supports typing rhythm. Suggestions for further research have been made.

Borhan Datfar