I agree in the owership of the rubric. The first year I did active physics I used the rubrics provided by the book. Last year and this year I had the students pick out point values etc for the rubric. I feel the ownership really helped them work on the project since they knew that is what they were graded on (truely the meaning of everything) as well as it is what they wanted. IT has really really helped. I also have students critique they own group work with a copy of the rubric before I do. They are harder on themselves then I am usually ( of course you have some that will try and give themselves all 100%

). I also have them grade evaluate group members on participation. This really seems to help with the complaining of he didnt do anything etc. (absence is a huge problem in my district so they evalutate each day they work on the challenge as well. for those students who are in school everyday it helps boost their grade for participation. I will try and post my rubric and group evalutation from this year when I get on my school computer.
I also showed Stomp before mini chapter challenge to help give ideas on music from original sources (since my students always want originality as one of the critiera in the rubric)
Hope this give a little more emphasis on how ownership of rubric can help you class. Just to give you an understanding of my students. I work in a school with 18% graduation rate. yeah i know really bad. Mostly from attendance. Every little thing I can do to get them to come to school and participate while they are here I try and do. this has helped. I have kids who will come to school for my class then leave (yeah working on them staying all day). Anyway just dont want you to think I have this great group of kids who want to be there and excell all the time. I struggle every day to get students to participate. (of course some more then others.. but who doesnt have that).
Tracy