viewpoints as the preference check. In this time, they could also see just design
images. Third, they performed eight basic mobile tasks with the low-fidelity
prototypes. The eight tasks were making a call, receiving a call, sending a message,
receiving a message, checking the time, checking the sender, taking a calling pose,
and carrying the phone. After that, they evaluated the usability of each design concept
with 9-point Likert scale. Performing both preference and usability tasks took about
twenty minutes per a participant. After finishing all the tasks, each participant was
interviewed about their opinion on the ...