The question I was attempting to ask is what type of answers the graders look for. Short, concise or long and thorough. Essays are subjective and that's not black and white like designing a project and implementing it based on that design. Those who are good with design often have a difficult time expressing thier thoughts and I'm trying to cover this from all angles.
In my opinion, if you can explain why you did design choice A and not design choice B in one sentence, one sentence is enough. To be one the safe side you can add further reasons for your choice, so that there are more than one sentence.
I think that SUN has different guys who read your answers and each of them has a different opinion about what is long or enough. That is why I think there is no general answer how long and how detail an answer should be.
As long as I make sure
that I did the coding and
give good reasons for my design choice
I should be on the save side to pass the second part of SCJD.
When I did the SCEA, I did it that way and pass it successfully. Even with the obstacle that the keyboard was german and but the PC thought it was an American one. So I had really problems in my English writing that there is a Z and not a Y for example.