  Social tagging has become an interesting approach to improve search and
navigation over the actual Web, since it aggregates the tags added by different
users to the same resource in a collaborative way. This way, it results in a
list of weighted tags describing its resource. Combined to a classical
taxonomic classification system such as that by Wikipedia, social tags can
enhance document navigation and search. On the one hand, social tags suggest
alternative navigation ways, including pivot-browsing, popularity-driven
navigation, and filtering. On the other hand, it provides new metadata,
sometimes uncovered by documents' content, that can substantially improve
document search. In this work, the inclusion of an interface to add
user-defined tags describing Wikipedia articles is proposed, as a way to
improve article navigation and retrieval. As a result, a prototype on applying
tags over Wikipedia is proposed in order to evaluate its effectiveness.
