This is the nineth weekly quiz to be taken on or before Tuesday, 8
2011. You should do it after you read the Natural User Interfaces section of
You should expect to spend 30 minutes to 2 hours on this quiz.
You may use your text and any other resources to do this quiz, but
if you do not know the answers well or are unable to discuss them
in class, you will lose credit for the quiz.
Revised 29 October 2011