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ISSN : 1229-8778
User Interface(UI) must be easy to understand, learn, and use for human-computer interaction. Most UI/UX researchers have demonstrated that the simpler a design is, the more effective use of UI is. But some researchers have argued a simple design may cause boredom and make difficult to distinguish between UI components if it is too simple. So, it is hard to say which one is better. Moreover, previous researches have used stimulus to differ the number of UI components in order to show simplicity and complexity of website design. It could be rather difficult to apply smartphone interface because it has a small display. Colors and shadows help to find target among UI components, but at the same time they increase perceived complexity. The depth of menu is also important for simplicity because smartphone applications have various depth. So, the purpose of this paper is demonstrate that various colors, shadows and the depth of menu affect perceived simplicity and task performance by using eye-tracker. The result shows that the effective performance were appeared in stimuli including either shadows or various colors. A basic type and shadow+color type lead to relatively ineffective performance because it help differentiating components but is too complex and distract attention from target. In other words, relation in simplicity and complexity is revealed U-shaped pattern. This study provide implication that various colors and shadows affect design simplicity and user's performance.
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