User experience is an important issue in the success of commercial mobile applications. Information architecture is a discipline which can be used to design user interface in order to achieve desirable user experience based on user and content analysis. In this research, the impact of information architecture on the software usability is evaluated by a quantitative approach. By selecting a mobile application, logging the users’ interaction automatically, and analyzing the log, usage problems are discovered. Afterward, navigation system is redesigned by using information architecture. Then, the usability of the new version of the application is evaluated. In this experience, 8 metrics are measured in 11 functionalities for each version of the application. Comparing the results show that among 88 measurements, 74 have been improved, 10 have been decreased and 4 have been unchanged. The most improved metrics are time to reach to the functionality, user extra activities and function finding.
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