Enhancing authoring, modelling and collaboration in E-learning environments: UNED research outline in the context of e-Madrid excellence network - Rodriguez-Artacho, M.; Mayorga, J.I.; Read, T.M.; Velez, J.; Ros, S.; Rodrigo, C.; Lorenzo, E.J.; Delgado, J.L.; Bárcena, E.; Castro-Gil, M.; Martín, S.; Molina, C.P. (2010 IEEE Education Engineering Conference, EDUCON 2010, 2010)