Alex Sandro Gomes, Clarisse Sieckenius de Souza, J. Alfredo Sánchez: 10th Brazilian Symposium on Human Factors in Computing Systems and the 5th Latin American Conference on Human Computer Interaction, IHC+CLIHC '11, Porto de Galinhas, Brazil - October 25 - 28, 2011. Brazilian Computer Society / ACM 2011, ISBN 978-85-7669-257-7