task execution which helps evaluate the prototype's fitness in fulfilling user performance requirements. This process leads to a validated design proposal which is more than just an evaluated user interface and can thus serve as a consensual basis for the final requirements definition.
The construction of an exploratory prototype urges the designer to transform user requirements formulated in a task-dependent way into software and dialogue functions. Context scenarios help focusing on the task and context-related issues when it comes to prototyping. On the other hand, the evaluation of a prototype urges the user to reflect attributes of task performance in view of technical features. Use scenarios serve as a means to concentrate on the task and contextrelated issues when evaluating the prototype, Use scenarios as well as prototypes thus help both the designer and the users to create synthetic effects regarding user performance and product design.
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