part A

The object that I like to use is my pmp
it plays movies and musics so it helps me to not be bored when im in the subway. also can be used as an electronic dictionary

visibility:
big,wid screen
palm size
bright&clear colour
it's clear to see wheather it's on or off
very simple design
arrows indicating when going up&down or left&right

feedback:
touch screen;beeps everytime the users touch the screen
options and current time are displayed
there's a speaker so the users don't have to use a headset at home

affordance:
easy to figure out how to use
the users can control everything with a thumb

constraints:
because it's touch screen, the users always have to carry a matching pen oterwise it will get fingerprints all over the screen

habituation:
easy to remember how to use because there's only a few buttons