The paper presents a case study on competences assessment and the introduction of “good practices”. The research was carried out in a secondary school that adopted the DADA model (Didactics for Learning Environments) and implemented it with a digital experimentation. The case study, through interviews conducted with nine selected teachers - according to the methodology of Interpretative Phenomenological Analysis - highlights the didactic changes favored by DADA and the digital, which led to the manifestation and evaluation of the students’ key competences described by the 2018 European Recommendation: personal, social and learning to learn competence, digital competence, citizenship competence, entrepreneurship competence and cultural awareness and expression competence. Furthermore, results lead to reflect on “collective competence”.