User Experience (UX) is crucial to the success or failure of any product in the market. Products that enable users to accomplish their needs better than competitors are most conducive to the brand's success. Consequently, it is vital to ensure the user is the center of every design decision in each stage of the process. Usability testing is a core element of an effective user experience that aims to reveal areas of confusion and uncover opportunities for further improvement. This method tests the functionality of any digital product by observing representative users as they endeavor to complete realistic tasks. Within this context, the particular thesis focuses on applying the usability testing method as part of the iterative Design Thinking Process (DTP) aiming at redesigning a mobile interface. The study begins with the delineation of an initial theoretical framework on the design thinking approach, usability testing and UX redesign topics. The applied methodology part addresses testing a real estate application («Spitogatos App»), extracting quantitative and qualitative data, and proposing design recommendations based on the critical findings of the tests. The case study concludes by redesigning the app's features and components which indicated usability issues during the test.
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