Refining a Task Description Notation to Cover Perceptive, Cognitive, and Motor aspects of the HCI loop: Application to Post-stroke Rehabilitation Exercises
Résumé
User task descriptions are the cornerstone of User-Centered Design (UCD) approaches. In user-centered design, they support the description of users’ work and the identification of users’ needs. Arguably, an exhaustive description of the tasks makes it possible to assess the complexity of the work to be performed, identification of potential user errors, the cost of recovering from errors, or the training needs of users. Early task description notations provided high-level descriptions of tasks focusing on hierarchical structuring of goals and tasks, knowledge required to perform the tasks, and collaborative aspects. Some notations, like HTA, support the description of user tasks in a generic way, while CTT refines them into user, system, interaction, or abstract tasks. However, like in most real-life cases, the task descriptions should be precise enough to allow human factors experts to perform the desired analysis. HAMSTERS notation refines CTT user tasks into perceptive, cognitive, and motor tasks. This paper presents three extensions to HAMSTERS, allowing more precise and detailed descriptions of each of these user tasks. For each extension, we present the rationale, the extension itself, and its application to a concrete example in the domain of exercises for post-stroke rehabilitation. These extensions are generic and can also be applied to any type of user tasks when fine details about task performance have to be described. As the task models increase in size when details are added, we present how the extensions have been added to the HAMSTERS tool, which is publicly available.
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