exercises - 17. models of the system

This exercise is based on the mobile phone scenario on the book website at: www.hcibook.com/e3/scenario/phone/.

List the main elements of the state of the phone (you can use programming language variable declarations for this) and then write down a step-by-step walkthrough of the state as the user accesses a shortcut at position '3' as in steps C.1C.10 of scenario C.