This exercise is based on the mobile phone scenario on the book website at: /e3/scenario/phone/ A…

This exercise is based on the mobile phone
scenario on the book website at: /e3/scenario/phone/ A user interface designer
analyzes Andy’s behavior with his original phone and realizes that both
scenarios A and B are part of a general pattern, as shown in the hierarchical
task analysis (HTA) in Figure 15.8.

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(i) Complete the HTA for phoning using the
original phone taking into account scenarios A and B only and briefly describe
your solution. (ii) Do a complete HTA for phoning using the new phone based on
scenario C only. You will find that scenario C (and hence your solution to part
(ii)) does not quite fit into the general pattern in Figure 15.8. Discuss
whether the solutions to (i) and (ii) can be modified to emphasize their common
features and whether this would clarify the overall task description.