$1.$ Design principles in a good Human$-$Centered Design. What part does memory play in the design? $(20$ points$)$

$2.$ Explain what the influence of user's age on the conclusion that a piece of technology is or is not user friendly. $(10$ points$)$

$3.$ Give a specific example of a health care technology where the age of the user might be a factor in the perception that technology is user$-$friendly.$(10$ points$)$