Defining usability: quality of use or quality of experience?

This paper is concerned with the impact of changing conceptualizations of usability from quality of use to quality of experience. At present, there are many calls to expand the usability construct, although there is no clear consensus as to how this can be achieved. The lack of such a consensus might result in the usability construct being broadened to such a degree as to become meaningless. The implications of this for the evaluation of electronic consumer products are discussed.