HI Sue,
I love how you have broken down the criteria for successful group participation!
For the rating scale, I'm wondering if the expectations have been made clear to the students. For example, what is the expectation that students will follow timelines. How would you exceed the expectations?
I always find it difficult to use criteria that is double barrelled. In the Quality criteria it says made a valuable contribution and produced quality work. I'm never sure how to respond if they did really well in one (made a valuable contribution but did not always produced quality work).