Abstract
The aim of the study was to investigate the usability of wheel-type navigation key of cell phone and MP3 product. An experiment was designed to evaluate the functional benefit of wheel navigation key by using performance test. A questionnaire was also used to examine the personal preference. Eighteen subjects were recruited. In results, a significant difference was found in performance time between wheel-type and button-type product. In general, the difference was more significant as subject's skill level was higher. In questionnaire, different preference depending on the skill level and key type was reported. In conclusion, it was shown that the wheel-type navigation key improved the performance better as the skill level and search requirement became higher. Therefore, the wheel navigation key would be helpful device for users if we could use them selectively in order to speed up the searching task and replacing simple push button task.
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