<![CDATA[High or low usability level of an application is tested by usability testing. Usability testing is used to test the level of usability of the system. This researcher uses the System Usability Scale (SUS) Method to answer research questions about user satisfaction. SUS was chosen because in this method the testing is done by involving the end user, where testing with this method is more emphasis on the point of view of the end user so the test results will be more in accordance with what is faced by the user. The number of complaints from PLN Mobile users is the main reason for testing the usability section of this application. The usability test results on PLN Mobile is 22.77% where the user is still not satisfied with PLN Mobile so the assessment given is not good. Improvement with the discovery prototyping method will collect improvement suggestions from users with a direct interview that will be made into a prototype improvement reference which will then be tested again. Suggestions for improvements obtained from respondents such as adding settings that can change the user's personal language and personal data stored in the application, improving the layout of features, placing the most important options and grouping menus in icons that are easy to understand on the main page. The usability testing result on prototype is 85.26%. Comparison of test results has increased by 62.49%.]]>
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