ABSTRACT
Many traditional usability tests focus on function (essentially the button pushing) and not on the process of how the information is used. Recent work in usability calls this model into question, arguing that it is too divorced from reality to provide useful information (Mirel, 2003). In its place a new approach has been called for (Redish, 2007), one that recognizes that most users operate, or carry out their tasks, within complex systems that present multidimensional challenges-layers of changing depth that, unfortunately, traditional usability methods often cannot adequately measure.
