Part A (Sohee, Yun)

The Item that i like to use is my cell-phone.
because there's Visibility, Feedback, Affordances
Mapping, Constraints, Habituation.

Visibility:
-full colour, bright and clear
-outstanding contrast and color rendition
-superior image quality.
-diplays every necessary informaton such as
calculator, alarm clock, scheduler, notepad, world clock
vocie memo.

Feedback:
-Visual feedback is superior image quality.
-Aural feedback is bell sound, button sound and music sound
-Tactile feedback is presses a button.

Affordance:
-easy to learn the control
-easy to dial the number of the cell-phone

Costraints:
-press keeps the cell-phone locked

Habituation:
-someone's phone numbers users can memorize
the press the button.
-there are only few buttons so the users can
memorize the control easily.