Firm foundation in the main hci principles, the book provides a working
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Human Computer Interaction Fundamentals
Figure 3.1 (a) The overall human problem-solving model and process and (b) a more detailed
view of the “decision maker/executor.” 3 2 H U M A N – C O M P U T E R I N T E R A C T I O N Figure 3.2 shows an example of a hierarchical task plan (equiva- lent to hierarchical goal structure) illustrating how the simple task of changing the font of a text could be solved, i.e., what kinds of basic tasks would be needed. Note that in a general hierarchical task model, certain subtasks need to be applied in series, and some may need to be applied concurrently. One can readily appreciate from the simple example in Figure 3.2 how an interactive task model can be hierar- chically refined and can serve as a basis for the interface structure. Note that, based on this model, we could “select” interfaces to realize each subtask in the bottom of the hierarchy, which illustrates the crux of the HCI design process. The interaction model must represent as much as possible what the user has in mind, especially what the user expects must be done (the mental model) in order to accomplish the overall task. This way, the user will be “in tune” with the resulting interactive application. The interface selection should be done based on ergonomics, user preference, and other requirements or constraints. Finally, the subtask structure can lend itself to the menu structure, and the actions and objects to which the actions apply can serve as the basis for an object-class diagram (for an object-oriented interactive software implementation). 3.1.2 Human Reaction and Prediction of Cognitive Performance We can also, to some degree, predict how humans will react and perform in response to a particular human interface design. We can Change font of “Hello” to Times- Roman Select text (“Hello”) Designate starting point of the text (Put cursor to the left of letter “H”) Designate the whole text (Drag to the right of letter “o”) Activate command list (Bring up the pop-up menu) Choose “Change Font” command (Choose menu item) Choose “Times-Roman” (Choose menu item) Change font to Times-Roman Download 4.23 Mb. Do'stlaringiz bilan baham: |
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