Overcoming the lack of screen space on mobile computers

Brewster, S.A. (2002) Overcoming the lack of screen space on mobile computers. Personal and Ubiquitous Computing, 6(3), pp. 188-205. (doi:10.1007/s007790200019)

Abstract

One difficulty for interface design on mobile computers is lack of screen space caused by their small size. This paper describes a small pilot study and two formal experiments that investigate the usability of sonically-enhanced buttons of different sizes. The underlying hypothesis being that presenting information about the buttons in sound would increase their usability and allow their size to be reduced. An experimental interface was created that ran on a 3Com Palm III mobile computer and used a simple calculator-style interface to enter data. The buttons of the calculator were changed in size between 424, 828 and 16216 pixels and used a range of different types of sound from basic to complex. Results showed that sounds significantly improved usability for both standard and small button sizes - more data could be entered with sonically-enhanced buttons and subjective workload reduced. More sophisticated sounds that presented more information about the state of the buttons were shown to be more effective than the standard Palm III sounds. The results showed that if sound was added to buttons then they could be reduced in size from 16216 to 828 pixels without much loss in quantitative performance. This reduction in size, however, caused a significant increase in subjective workload. Results also showed that when a mobile device was used in a more realistic situation (whilst walking outside) usability was significantly reduced (with increased workload and less data entered) than when used in a usability laboratory. These studies show that sound can be beneficial for usability and that care must be taken to do testing in realistic environments to get a good measure of mobile device usability.

• Item Type: Articles
• Keywords: Buttons, Earcons, Evaluation, Mobile computers, Non-speech sounds, PDAs, Sonically-enhanced widgets
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Brewster, Professor Stephen
• Authors: Brewster, S.A.
• Subjects: Q Science > QA Mathematics > QA75 Electronic computers. Computer science; Q Science > QA Mathematics > QA76 Computer software; T Technology > T Technology (General)
• College/School: College of Science and Engineering > School of Computing Science
• Journal Name: Personal and Ubiquitous Computing
• Publisher: Springer Verlag
• ISSN: 1617-4909
• Copyright Holders: Copyright © 2002 Springer
• First Published: First published in Personal and Ubiquitous Computing 6(3):188-205
• Publisher Policy: Reproduced in accordance with the copyright policy of the publisher