Information Systems, E-learning, and Knowledge Management Research 4th World Summit on the Knowledge Society, WSKS 2011, Mykonos, Greece, September 21-23, 2011. Revised Selected Papers - Lytras, Miltiadis D.; Ruan, Da.; Tennyson, Robert D.; Ordonez De Pablos, Patricia.; Garca̕ Peąlvo, Francisco Jos.̌; Rusu, Lazar. (Springer Berlin Heidelberg : Imprint: Springer, 2013)