| Summary: | 碩士 === 國立臺灣科技大學 === 工業管理系 === 103 === Through user experiment, this study aimed to know the effects the Density, Display size, and C/D gain on the Most Appropriate Target Size (MATS) and the performance, from users of different ages using pinch gestures to zoom and click on targets with a zoomable interface on a multi-touch screen.
Twenty participants (10 young and 10 elder adults) were recruited to perform the zoom-and-click experimental task on portable touch devices of three display sizes (5-inch, 7-inch, 10-inch). The experimental task was carried out under three different C/D gain (CDG=0.5, 1, 0), four kinds of different Density (DIV = 0, 0.5, 1, 2) and two bonus conditions to collect the most appropriate target size (MATS) together with the deviation from the target center (Deviation) and the operating time (Time) for subsequent analysis. The results showed that the average MATS was about 5.5mm. For users of different ages, the MATS for young people was about 4.1mm and for elder people was about 6.9mm, respectively. MATS on 7-inch (5.23mm) display was found to be smallest, while that on 10-inch (5.66mm) display was biggest. And MATS increased significantly with higher CDG and density. Age did not induce significant effects on operation time, meaning the zoomable interface improve the elder person’s time performance.
The results of this study may provide design guidelines to touch interface engineer/ designer under different conditions for optimal button or target size. Future studies are suggested to accurately measure the handheld distance of devices and divide operating time into zooming and clicking time to verify the hypotheses proposed in this study.
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