In light of changing media landscape through Web 2.0 technologies, which leading to rise of user-generated content on the World Wide Web, the credibility presence has become a crucial issue for enhance and survival many of media organizations not only as one of pillars media ethics and one of the major elements of its legitimacy, but also as the crucial factor of success in society digital. Consequently, a practical support is required regarding determination and measurement of credibility by abandoning traditional methods and adopts new methods and tools. In this article, we introduce a new methodology "concrete experimental", to highlighting the effects of aesthetics and usability before and after actual use, which allows us to test news websites credibility in a systematic way.