Nowadays, with advances in software technologies, the importance of achieving non-functional (quality) requirements, is increasingly growing. One of these requirements is usability. Considering direct user interaction with user interface, high quality of interface, plays an important role in increasing user satisfaction. For this purpose, software user interface must have the suitable usability. To achieve this, some actions have been always done to evaluate the software usability. The quantitative evaluation of qualitative concepts such as usability has been always associated with many challenges. In this paper, a fuzzy expert system has been developed for quantitative evaluation of usability and also increasing the detection of problems and deficiencies in interface design. This system, evaluates usability quantitatively, and by detecting design problems and deficiencies, designers can correct and eliminate them easily.

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