Proceedings of the 23rd Australian Computer-Human Interaction Conference (OzCHI 2011) [electronic resource] : held at the Australian National University, Canberra, 28th November to 2nd December 2011 in cooperation with the ACM SIGCHI / edited by Cécile Paris, Nathalie Colineau, Vivienne Farrell, Graham Farrell & Weidong Huang