Our project aims to create a university certificate of 10 ECTS credits in economic, ecological and social transition. This certificate will consist of a set of educational activities, including an introductory MOOC on sustainable development and transition issues (MOOC DD&T). The certificate is intended for adults who are resuming their studies in order to enable them to develop complex knowledge and skills related to the ecological and social transition. The use of a MOOC format device as part of the certificate will allow for flexibility for learners while integrating MOOC-related learning into the certificate’s face-to-face activities. In addition, the MOOC will be integrated into other training courses for adults who are resuming their studies (in particular in degree programmes organised on a staggered schedule in order to be able to target this audience) and can therefore serve as a gateway for those who wish to continue with the certificate.