An article on the Paradyme Solutions blog examines the term user experience design and analyses its relation to other fields, such as experience design, interaction design, information architecture, human-computer interaction, human factors engineering, usability and user interface design.
After pointing out and dissecting the overlap between these fields, the author concludes “the field of user experience design takes a broad approach to the enhancement of products, combining elements from various fields to create an optimal and well-rounded experience. This holistic methodology is often more adept at helping to reach a set of goals that encompass passive and active user interactions–goals determined both by users and the business or organisation.”
(via Logic+Emotion)