inability

n 1: lack of ability (especially mental ability) to do something

[ant: {ability}]

2: lacking the power to perform [syn: {unfitness}] [ant: {ability}]

usability

The effectiveness, efficiency, and satisfaction

with which users can achieve tasks in a particular environment

of a product. High usability means a system is: easy to learn

and remember; efficient, visually pleasing and fun to use; and

quick to recover from errors.

{(http://www.orrnet.com/)}.

(1999-04-01)