Model-based usability evaluation evaluation of tool support

Usability evaluation can be accomplished in different ways, depending on individual information interests and specific constraints. In some cases the test user and the usability evaluator are located at different places, for instance in mobile environments or in the case of Internet websites, where the user can't be observed as in a laboratory situation. The usage of multi-modal interfaces introduces some additional constraints. To overcome the problems, techniques of remote usability testing are applied. The data recorded during the test is structured und afterwards analyzed. A user centric approach structures the data based on tasks that are intended by the user, A task model describes the tasks composed of subtasks and temporal relationships between them. This paper introduces and evaluates two tools, AWUSA and ReModEl, which use task modeling for remote usability evaluation.