The Usability consists of a set of attributes that allow evaluating the user effort to perform a certain task through the use of a specific software. Therefore, a software application is considered usable when it requires the least possible effort. Actually, the World Wide Web, has become in a great repository of information that is presented and offers to users through various websites or pages whose purpose is to ensure access to information and thus, ensure equality of opportunities. On the other hand, the evolution of the technologies, that support it, have converted the World Wide Web in a technological platform on which applications can be developed with a level of interaction and functionality like to desktop applications (WIMP). There are a variety of works about web usability, mainly they are focused on aspects such as the navigation and the information architecture of sites or web pages. However, the usability of Web applications, whose experience includes high degree of interaction with the user (action-oriented) like to desktop applications, can't be evaluated in the same way as a website (information-oriented), where the interaction is low and limited. While there are a variety of works, whose object of study is the usability in applications of mobile or desktop environments, works related to the usability of web applications have not been recognized.
