Human-Computer Interaction – INTERACT 2013 14th IFIP TC 13 International Conference, Cape Town, South Africa, September 2-6, 2013, Proceedings, Part IV - Kotzé, Paula; Marsden, Gary; Lindgaard, Gitte; Wesson, Janet; Winckler, Marco (Springer Berlin Heidelberg : Imprint: Springer, 2013)