用户体验User Experience (UX)近几年被提到的越来越多了，可是究竟什么是用户体验，用户体验的定义并不明确。在用户体验UX还没有一个业界公认的定义之前要测量用户体验UX还是很难的。当然不同的行业对用户体验的理解不一样，用户体验关注的侧重点也可能不一样，但这并不意味着用户体验不需要一个大家公认的定义。
我们都知道可用性Usability有ISO的定义，可用性要测量的就是efficiency，effectiveness and satisfaction。有了这样的定义，大家在做可用性测试的时候，在报告可用性测试结果的时候都有章可循了。
前边已经有文章介绍了如何量化用户体验。这里要介绍的一篇文章是Nokia学者写的“Towards a shared definition of User Experience”，怎样得到一个统一的(universal)可操作划的(operational)，可测量的(measurable)用户体验的概念，让用户体验更能为实践服务。
Table1 Sample User Experience Definitions
Alben: All the aspects of how people use an interactive
product: the way it feels in their hands, how well they
understand how it works, how they feel about it while
they’re using it, how well it serves their purposes, and how
well it fits into the entire context in which they are using it.
• Wikipedia: User experience is a term used to describe
the overall experience and satisfaction a user has when
using a product or system.
• Nielsen-Norman Group: All aspects of the end-user’s
interaction with the company, its services, and its products.
• Mäkelä & Fulton Suri: A result of motivated action in a
certain context.
• Hassenzahl & Tractinsky: A consequence of a user’s
internal state (predispositions, expectations, needs,
motivation, mood, etc.), the characteristics of the designed
system (e.g. complexity, purpose, usability, functionality,
etc.) and the context (or the environment) within which the
interaction occurs (e.g. organisational/social setting,
meaningfulness of the activity, voluntariness of use, etc.)
Table2 Sample statements about UX
1. UX is an emergent field without a formal body of
knowledge
2. UX is a term that is elusive to grasp
3. UX is a momentary feeling a user has while interacting
with a system
4. UX is an attitude towards a system
5. UX is an emotional bonding with a system
6. Expectations determine user experience
7. UX is a value
8. We cannot design user experience, but we can design for
user experience
9. Usability is subsumed by UX
10. UX is best viewed in terms of marketing
