| Summary: | 碩士 === 元智大學 === 工業工程與管理學系 === 105 === It will affect users’ performance of touching when the buttons’ size on the touchscreen when the buttons are too small. In previous researches, the researches usually applied aiming movement method of Fitts’ law. The aiming movement method of Fitts’ law which include the feedback of vision to modify the moving error when the moving. They used this method to measure which size of button that had the best evaluation result. However, using this method by modifying the feedback of vision, was still hard to verify whether the selected button size made user easily or not touch it. In the other hand, Xue (2013), Lin (2015), and Aguilera (2015) used the ballistic movement method to investigate the touching movement on the touchscreen in different situations. They found the probability about applying ballistic movement method to design the size of button was not verified. Therefore, in this study, we used ballistic movement method to design the size of button, and then did experiments to verify it. Comparing the result of experiments and the hypothesis for this research to verify ballistic movement method is applicable to design the size of button on the touchscreen.
The experiments were separated to two phases. First phase was “experiment of measured ballistic parameter” that aimed to get the standard deviation of moving error from participants in the horizontal direction and vertical direction. The buttons applied the size standard deviation in two direction that multiplied to 5 times, 6 times, 7 times, 8 times to design the oval standard deviation buttons, and then used in the two experiment of second phase. The second phase of this research was combined with “experiment of Fitts’ aiming movement” and “experiment of ballistic movement”. Two experiments of second phase were aimed to analyze the accuracy of touching and the time of touching. The result of experiments found (1) Fitts’ aiming movement had better accuracy, but it spent more time on fixing moving error with feedback of vision; (2) ballistic movement had worse accuracy, but spent less time on moving; (3) spending too less moving time on Fitts’ aiming movement or spent less moving time than ballistic movement, the accuracy changed obviously with the size changed of buttons; (4) the accurate probability of Fitts’ aiming movement close to 100% when touching the 7 times standard deviation size buttons and the accurate probability of ballistic movement was not only close to 100% but also the same with each other when touching the 8 times standard deviation size buttons.
Applying ballistic movement method to design the size of buttons on the touchscreen is suitable for different ages, different groups, and different situations. Gutting the standard deviation from the error of ballistic movement in certain situations, the accurate probability of touching the 8 times standard deviation size button with ballistic movement close to 100%. Because of the different needs and screen limited of smartphone, touching the 5 times, 6 times, and 7 times standard deviation size buttons with feedbacks of vision, and the accurate probability are close to over 97.6%.
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