EXERCISE 15.6  This exercise is based on the mobile phone exercise on the book site: http://www.hcibook.com/e3/scenario/phonehttp://www.hcibook.com/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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