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The main research goals of this study are as follows: 1) to examine the effects of UI design on the learnability of smartphone applications and the interaction between users and applications, and 2) to find the effects of the learnability and the interaction on the usability of the applications as perceived by users. The results showed the significant direct effects of UI design on the learnability of applications and the interaction between users and applications. In addition, the results of this study also showed the significant effect of the learnability of applications, as well as the significant impact of the interaction on the usability of the applications as perceived by users.

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