Do you design for a need or want? Do you design because you think it is important or because you connected with the user? Do you look at universal patterns or stereotypes? Do you test your solutions before production? By the time you reach here, you should be able to apply you fundamental understanding and your experiences to HL.
 
My take on the IB Curriculum Structure:
If you see the IB curriculum, you will find that the way I have put together the chapters, they differ in order. This is because this is the best way (I feel) to teach Design Technology. Starting from how one comes by ideas, develops them, manufactures them, keeping comfort a priority, and manages resources to come up with a great design solution.