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One major problem with mobile computing devices is lack of screen space. One way to overcome this is to reduce the size of the graphical components on screen and present information in sound. This paper describes a small pilot study to investigate the usability of sonically-enhanced buttons of different sizes. Results showed that sounds improved usability for both standard and small button sizes and that the most sophisticated sounds were the most effective.
Brewster et al. (Fri,) studied this question.