Grafic Interface and test of efficience
The norm ISO 9241 says that the usebility is “the grade with whom a product may be used by particolar users to reach some goals with efficacy, efficiency and satisfaction in a specific use context”
For example, usually a software is used after have bought it; a web site is first of all used and only if it is satisfying, it will be used for a transaction and eventually gives profits.
It means that for software the usebility is not an important matter for profits; but it is really determining in web site, because it is preliminary condition to reach profits.
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