Interactive Storytelling Fourth International Conference on Interactive Digital Storytelling, ICIDS 2011, Vancouver, Canada, November 28 – 1 December, 2011. Proceedings - Si, Mei; Thue, David; André, Elisabeth; Lester, James C.; Tanenbaum, Joshua; Zammitto, Veronica (Springer Berlin Heidelberg : Imprint: Springer, 2011)