Some of my groups have been at work, and when I put out the rubric, that was a little kickstart in some places. But not all. Today there was some consternation at the mention of a deadline tomorrow, with a couple of students acting as if they had no idea what was going on. This despite the fact that it's all been out there in writing and I've given reminders in class.
But tonight I went to my Google docs and saw every single document title bold, indicating work has been done. I'll wait until after the deadline to see what they've been up to.
Tomorrow they will have class time to plan for their solution.