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 !
Tapia, Mark A. and Kurtenbach, Gordon (1995): Some Design Refinements and Principles on the Appearance and Behavior of Marking Menus. In: Robertson, George G. (ed.) Proceedings of the 8th annual ACM symposium on User interface and software technology November 15 - 17, 1995, Pittsburgh, Pennsylvania, United States. pp. 189-195. http://www.acm.org/pubs/articles/proceedings/uist/215585/p189-tapia/p189-tapia.pdf