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Web sites are becoming important assets for several companies, which need to incorporate sophisticated technologies into complex and large Web based systems. As a consequence, methodologies and tools are required for their design, implementation and maintenance. In particular the possibility for a site to evolve so as to provide updated and accessible information is a fundamental need. Web sites are considered the object of several analyses, focused on their structure and their history, with the purpose of supporting maintenance activities. Structural information may help understanding the organization of the pages in the site, while history analysis provides indications on modifications that do not correspond to the original design or that produce undesirable effects. A tool was developed to implement the analysis of Web site structure and evolution. Its application to some examples downloaded from the Web …