Now-a-days, new technologies and the fast growth of the Internet have made access to information easier for all kind of people, raising new challenges to education when using Internet as a medium. One of the best examples is how to guide students in their learning processes. The need to look for guidance from their teachers or other companions that many Internet users experience when endeavoring to choose their readings, exercises or practices is a very common reality. In order to cater for this need many different information and recommendation strategies have been developed. Recommendation systems is one of these.