Usually the creation of digital educational materials is done from a software development methodology, however, this approach does not exceed the traditional education scheme in which someone or something has information that others must learn in order to take part in some kind of test. This work presents some of the conclusions and lessons learned during the implementation of Computerized Education Materials (CEM) as part of a whole action-research process from Study of Contextualized Problematic Situations (SCPS), a didactic proposal based on Science – Techology - Society (STS) approach, the Critical Pedagogies and Free Software movement.