Think of a 'design challenge' that you've encountered in your professional/academic/other experience that was particularly successful. What was good about it, why did it work?
OR
Think of a particularly 'bad' design challenge. Why was it, well, bad? Why didn't it work? How could it have been better?
Design Challenge Assignment: A Good Design Challenge You've Encountered
OR
Think of a particularly 'bad' design challenge. Why was it, well, bad? Why didn't it work? How could it have been better?