Through Key Task analysis, main tasks can be identified. But to carry out TNA, more details of those tasks needed to be identified. According to Buckley and Caple (2000), Annett and Duncan (1967) developed ‘Hierarchical Task Analysis’ technique. It can be used in wide range of tasks analysis. It breaks down the main tasks into sub-tasks and each sub-task into more elementary tasks and so on. It identifies each task as what to perform and how to perform. Figure (2.5) will illustrate this:
Figure (2.5): Hierarchy of Tasks (Buckley and Caple 2000, p. 74)
This type of task analysis is better to use because of its wider uses. It is not restricted to any particular level or occupational group(s).
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