Abstract
In recent years, the fast evolution of Internet and the Web has caused an exponential increase in the number of Web Information Systems (WIS) developed. This has led to the appearance of a new discipline, Web Engineering, which has served as a framework for the development of numerous methodologies and tools which seek to contribute to the development of WIS with the quality parameters required by their users. Among the quality attributes of a WIS are accessibility, usability and the easy of navigation offered by the system. These attributes are usually analyzed when the WIS has been developed, using strategies like the analysis of the HTML code of the WIS or the evaluation of the system by a group of users. This paper presents a proposal to extend the models used in the methodologies for WIS development and to define a set of quality metrics so that modelers can consider usability requirements during WIS modelling. The automatic support for this proposal and the metamodel extension necessary for its integration into the existing methodologies for WIS development are also presented.
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