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 !
Powers, Michael K. (1989): Ensemble: A Graphical User Interface Development System for the Design and Use of Interactive Toolkits. In: Sibert, John L. (ed.) Proceedings of the 2nd annual ACM SIGGRAPH symposium on User interface software and technology November 13 - 15, 1989, Williamsburg, Virginia, United States. pp. 168-179.