Yes, you need to explain why things are designed the way they are. There are whole disciplines around it called "Human Computer Interaction" http://en.wikiped

Yes, you need to explain why things are designed the way they are. There are whole disciplines around it called "Human Computer Interaction" http://en.wikipedia.org/wiki/Human-computer_interaction http://en.wikipedia.org/wiki/Human-computer_interaction and "Information Design" http://en.wikipedia.org/wiki/Information_Design http://en.wikipedia.org/wiki/Information_Design