Nowadays the successful acquisition of competences is the base for the achievement of the professional skills and, consequently, the educational methodologies need to be reconsidered. This work describes a methodological procedure proposed to help educational experts to assess if the competences developed in a degree program are really acquired by the student. Due to the huge amount of information, this analysis is addressed through Data Mining techniques. The procedure has been successfully tested in the Computer Engineering and in the Telecommunication Engineering degrees of our institution. The analysis of results allowed experts to identify some non promoted competences.