Systems design is the process of defining the architecture, modules, interfaces, and data for a system to satisfy specified requirements. Systems design could be seen as the application of systems theory to product development.
Why do I see duplicate challenges? You'll see duplicates because a question may fall into different categories. We keep them here bec ause we believe that it is good to sporadically review old challenges. They are optional if already completd-- but reviewing them (and more importantly redoing them with the new knowledge) will ensure that you've let the material sink in.