“Several models of UX have been suggested, some of which are based on Hassenzahlâ€™s model. This model assumes that each user assigns some attributes to a product or service when using it. As we will see, these attributes are different for each individual user. UX is the consequences of these attributes plus the situation in which the product is used.
The attributes can all be grouped into four main categories: manipulation, identification, stimulation and evocation. These categories can, on a higher level, be grouped into pragmatic and hedonic attributes. Whereas the pragmatic attributes relate to the practical usage and functions of the product, the hedonic attributes relate to the userâ€™s psychological well-being. Understanding the divide can help us to understand how to design products with respect to UX, and the split also clarifies why UX itself cannot be designed.”
Helge Fredheim wrote a smart article in Smashing Magazine to clarify why UX cannot be designed.