Web sites are complex projects, that incorporate Design and Computing elements, for content publication in the World Wide Web. The present work has as a starting point the hypothesis that large scale Web sites (corporate ones or not), which demand fast, daily and organized updates have caracteristics of Industrial Design Projects, where it is necessary the existence of documents that make possible their reproduction and continuity. Therefore, the documentation is a fundamental tool that should work efficiently in its update and management process. This research work focus on the documentation process of PUC- Rio`s Web site. It has been taken into account Design and Computing issues present in this process, as well as issues present in the border and intersections of these two areas. The objective was to analise the data collected, and extract recommendations and conclusions about the methodologic issues, forms and formats of information representation envolved in the generation of PUC-Rios Web Site documentation and its use as a tool for the sites developing and updating process. There have been identified many interdisciplinary aspects of this research s theme that can be studied further on. And considering the small number of publications with similar approach, we believe this work represents an important contribuition to the areas related to Web sites documentation, updating and management.