1. Which keypad layout (A/B/C/D) took least time for dialing a number? Why?
2. Which keypad layout (A/B/C/D) took maximum time for dialing a number? Why?
3. Which keypad layout is more prone to errors?
4. By how much will the time to dial increase/decrease if the size of buttons is doubled in the layout?
5. Will the time to dial increase/decrease if the font-size of label on the buttons is increased?
6. Use laptop touchpad to interact instead of mouse and compare the results?
