In: Constantine Stephanidis (Hrsg.). Universal Access in Human-Computer Interaction. Applications and Services. International Conference on Universal Access in Human-Computer Interaction - Addressing Diversity (UAHCI-2009), 5th, located at HCI International 2009, July 19-24, San Diego, CA, USA, Pages 179-188, Lecture Notes in Computer Science (LNCS), Vol. III, No. 5616, ISBN 978-3642027123, Springer-Verlag, Berlin/Heidelberg, 7/2009.