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 !
In, Hoh Peter, Baik, Jongmoon, Kim, Sangsoo, Yang, Ye and Boehm, Barry W. (2006): A quality-based cost estimation model for the product line life cycle. In Communications of the ACM, 49 (12) pp. 85-88. http://doi.acm.org/10.1145/1183273