Applications and Usability of Interactive TV 4th Iberoamerican Conference, jAUTI 2015, and 6th Congress on Interactive Digital TV, CTVDI 2015, Palma de Mallorca, Spain, October 15-16, 2015. Revised Selected Papers - Abásolo, María José; Perales, Francisco J.; Bibiloni, Antoni (Springer International Publishing : Imprint: Springer, 2016)