Definitions of Rich User Experience (III)

This evolution was feasible because the digital world has been morphing from a world of scarcity (classic Adam Smith economic model) to a world of abundance (Chris Anderson’s Long Tail theory) of resources resulting into lower prices and higher availability of chips, servers, computers, bandwidth, software, etc. However, the advantages that RIA offers do not come without some inherit risks such as security compromises, poor indexing for searching, inefficiency, complexity, and high development costs in certain instances.
Below are few good definitions of user experience:
 User Experience (UX or UE) is a term used to describe the overall experience and satisfaction a user has when using a product or system. It most commonly refers to a combination of software and business topics, such as selling over the web, but it applies to any result of interaction design.
Wikipedia
 User Experience (UX or UE) encompasses all aspects of the end-user's interaction with the company, its services, and its products. The first requirement for an exemplary user experience is to meet the exact needs of the customer, without fuss or bother. Next comes simplicity and elegance that produce products that are a joy to own, a joy to use. True user experience goes far beyond giving customers what they say they want, or providing checklist features. In order to achieve high-quality user experience in a company's offerings there must be a seamless merging of the services of multiple disciplines, including engineering, marketing, graphical and industrial design, and interface design.
Nielsen Norman Group