21st Century learning for 21st century skills : 7th European Conference on Technology Enhanced Learning, EC-TEL 2012 Saarbrücken, Germany, September 18-21, 2012 Proceedings - Ravenscroft, Andrew; Lindstaedt, Stefanie; Kloos, Carlos Delgado; Hernández Leo, Davinia (Lecture Notes in Computer Science / Series editors: Gerhard Goos, Juris Hartmanis, and Jan van Leeuwen, 2012)