In this paper, a methodological approach based on constructivism and collaborative work is presented. In particular, a semi-automatic and automatic validation of this methodology is described. A rubric has been defined using 4 main indicators: a student's role in the group, a student's level of participation and interaction, results, and the quality of messages exchanged. Additionally, several technologies have been used for the process of automatic evaluation, these being natural language processing, social networks and fuzzy reasoning.