“Why is the lack of a shared definition? There are several reasons: First, UX is associated with a broad range of fuzzy and dynamic concepts, including emotional, affective, experiential, hedonic, and aesthetic variables. Typical examples of so-called elemental attributes of UX like fun, pleasure, pride, joy, surprise, and intimacy are but a subset of a growing list of human values. Inclusion and exclusion of particular values or attributes seem arbitrary, depending on the author’s background and interest. Second, the unit of analysis for UX is too malleable, ranging from a single aspect of an individual end-user’s interaction with a standalone application to all aspects of multiple end-users’ interactions with the company and the merging of the services of multiple disciplines. Third, the landscape of UX research is fragmented and complicated by diverse theoretical models with different foci such as emotion, affect, experience, value, pleasure, beauty, etc.” (MAUSE COST Action 294)