Hierarchical Task Analysis (HTA)

“Hierarchical Task Analysis (HTA) was originally designed to identify training needs (Annett and Duncan, 1967). It involves breaking a task down into subtasks and then into sub-subtasks and so on. These are then grouped together as plans that specify how the tasks might be performed in an actual situation. HTA focuses on the physical and observable actions that are performed, and includes looking at actions that are not related to software or an interaction device at all. The starting point is a user goal. This is then examined and the main tasks associated with achieving that goal are identified. Where appropriate, these tasks are subdivided into subtasks.”

From: Preece, J., Rogers, Y., Sharp, H. (2002), Interaction Design: Beyond Human-Computer Interaction, New York: Wiley, p.231


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