No abstract

This paper presents a new predictive scanning strategy based on the N-ary search algorithm. This strategy is demonstrated on three virtual keyboards operated by hissing -a novel interaction method suitable for severely motor impaired people with speech impairments. An experiment with 39 users was conducted to compare the keyboards to three existing scanning keyboards. The participants were able to enter a text by hissing at the speed of 10-16 characters per minute. Experiment results have also shown that a scanning strategy must be predictable for the users as they need to plan their actions in advance.

No abstract

No abstract

No abstract