This is the point in the process where project groups will converge on a single idea. They will then begin to develop different versions of this idea to present for feedback. It is crucial to help guide each group towards an idea that is generative, and encourage them not to skip sketching and iteration.
Yes - this is a lot of sketching, and it may seem like we are revisiting the brainstorming activity. It is important for students to expand on their ideas at every stage so that they don't get stuck on one version of one idea from the beginning.