The pedagogical and visual design of the MOOCs, their information architecture, usability and visual and interaction design could be having a negative impact on student engagement, retention and completion rates as it has been previously analyzed in adult learning.[33] Whilst designing a service based on MOOCs to be used by people with functional diversity, it is important to consider the accessibility level of each of the parts of the system and also the role of the meta-information related to functional diversity, for instance, to define specific user profiles.