Mike Petrich and Karen Wilkinson, from the Tinkering Studio at San Francisco's legendary Exploratorium museum, have created an alternative Learning Dimensions Framework for the assessment of student engagement in project-based learning.

Students are assessed for such measures as engagement, initiative and intentionality, social scaffolding, and development of understanding. While these measures are not easy to assess on the high-stakes tests used in most US public schools, those of us who teach know that these are the measures that really matter. Take a look!
http://tinkering.exploratorium.edu/learning-and-facilitation-frameworks