Design Research: If you had to design visual environment for a play set in a high school student's bed room, what would you do? Go home and draw your own room! Easy, right? Your own room would be considered primary research. This research would fully support your ideas and design.
Well, what if you have to design the set for a play set in an 1890's home? If you live in a house built around that time, drawing the room layout might work, but the furniture and wall colors wouldn't work. Not to mention that several renovations may have been done years before you were born. What would you do?