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Students in each semester must complete the Online Credit Hour Form (KRS). Usability is closely related to user experience, but there is still not much consideration in developing interfaces. User Experience is used to show the ease and efficiency felt by users in using the system. The purpose of the study was to evaluate the usefulness of using fuzzy logic values based on several criteria. Criteria become basic needs or conditions that must be met in content to be used by the average user. The Usability Assessment Criteria consist of learnability, memorability, efficiency, error, and satisfaction. Based on the Usability Assessment Criteria will be done to assess the quality with the values of linguistic variables (i.e .: very good, good, enough, bad, and very bad). However, the existing description of this attribute has subjective value, so the assessment is not clear. Therefore this study produces fuzzy rules that can be used as fundamental usability assessment rules. The use of fuzzy rules in evaluating usability can be used to identify and evaluate software problems to propose an efficient solution.