The quality of being
usable; the amount of
self-
explanation inherent in the
interface.
A system (or thing) with high usability has low
demands on
the
users
previous knowledge or
intellectual capabilities.
In
ideal, it is always
perspicuous what can be done
with a specific
item,
tool,
machine or
software product,
as well as
how it can be accomplished.
see also: Web Usability, Design