You have decided to change the design of a button on an interface screen specifically for the

functionality of cutting data in a document. Here is the change you are making to that button:

a$)$ Identify and explain one theory or principle that is related to your decision to

make this change? $[5\%]$

b$)$ Using the theory or principle identified in $3$a$),$ explain how that theory or

principle works in humans $($when thinking about a human as a sub$-$system of

the HCI complex system$)?$

$[5\%]$

c$)$ In terms of making this change to the button, identify four types of people who

this change might not work for? Explain why in terms of a human as a sub$-$

system of the HCI complex system?