Marc Hassenzahl explains the fascinating concept of User Experience and Experience Design. Commentaries by Don Norman, Eric Reiss, Mark Blythe, and Whitney Hess
User Experience and Experience Design !
Hurst, Nathan, Marriott, Kim and Moulder, Peter (2002): Dynamic approximation of complex graphical constraints by linear constraints. In: Beaudouin-Lafon, Michel (ed.) Proceedings of the 15th annual ACM symposium on User interface software and technology October 27-30, 2002, Paris, France. pp. 191-200. http://doi.acm.org/10.1145/571985.572012