Submit a sketch This sketch should include the main entities in your system, the way they communicate, as well as an overview of the main functionality of each entity.

Some ideas as to how you will test this system are welcome but not required.

Note: You can draw this sketch on a piece of paper or a whiteboard, take a photo and then upload it here. We are looking to see that you've started your design, that you have thought about the main functionality of the system, and of course, that we can give you feedback on this initial stage!