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can be defined as the extent to which a product can be used by specified users to achieve specified goals with effectiveness, efficiency, and satisfaction in a specified context of use (ISO, 1998). Usability of an interface is usually associated with five parameters (ISO, 1998; Nielsen, 1993), derived directly from this definition:

1) easy to learn: the user can get work done quickly with the system, 2) efficient to use: once the user has learnt the system, a high level of productivity is possible, 3) easy to remember: the casual user is able to return to using the system after some period without having to learn everything all over again,
4) few errors: users do not make many errors during the use of the system or if they do so they can easily recover them, 5) pleasant to use: users are subjectively satisfied by using the system; they like it.



European Union Seventh Framework is a Network of Excellence. The research leading to these results has received funding from the European Community's Seventh Framework Programme (FP7 2007/2013) under the Grant Agreement 270404.