performance after having investigated the cohtextual conditions of user's task performance.
With the aid of further usability standards ( ISO 9241, Parts 13-17)), the analyst can suggest user interface attributes serving as minimum design proposals to amend the list of performance requirements, Of course, the designer may feel free to create a design solution above the recommended minimum level. Nevertheless, all partners involved in the early analysis and design stage can be satisfied with an early test of the requirements for compliance with the required minimum quality of human-computer interaction represented by the standard.
This paper wants to show that opposite to many quality assurance standards (e.g. ISO 9000-3 [ 1991], ISO 13407 [ 1999]) the validation of usability requirements can be done prior to verification and very early in the development process. Scenarios are an effective means for supporting this strategy. They allow the domain expert (user) to really participate in the development of requirements and their validation, and they enable the analyst to better understand the problem domain.
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