A rubric is a scoring guide that enables judges to make reliable judgments about student work and guides students as they self-assess their work.  A rubric is based on a continuum of performance quality and built upon a scale of different possible score points to be assigned.  The rubric identifies the key traits or dimensions to be examined and assessed; and provides key features of performance for each level of scoring (descriptors) which signify the degree to which the criteria have been met.  Examples of various holistic and analytic trait rubrics can be found within the instructional guides on Teach 21,