This is a basic question of terminology, not of role/title
identification.
UCD is an approach to creating products that considers the needs and
goals of the user to be the highest priority. There are other
approaches to creating products (activity-centered design, systems
design, and genius or expert design being the other major ones).
UX is the umbrella term that encompasses all aspects of a product:
content, form, visuals, sound, behavior, structure. Interaction design
is one of many disciplines that contribute to the user experience.
Usability has traditionally meant product testing, or has been equated
with design, particularly interaction design. Usability is one of the
three main pillars of great products (usefulness and desirability are
the other two). Usability should be part of every designer's job,
although there are some "usability engineers" whose role is to test
for the ease of use of a product, or determine best practices for
types of products.
Hope this helps. IxDA, where's our wiki glossary?
Dan
Dan Saffer
Principal, Kicker Studio
http://www.kickerstudio.com
http://www.odannyboy.com
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