PBLWorks This website offers rubrics for grades K-2, 3-5, and 6-12. It’s a great place to start. For access to PBLWorks, you must register. However, this website is free!
Microsoft Innovative Learning This website offers rubrics for assessing the 21st Century skills. The link leads to a PDF file with Collaboration rubrics for all grades.
YouTube: Team Building Games This YouTube channel offers a variety of videos showing and explaining team building activities.