Embrace the dynamic nature of rubrics and revise as necessary. When grading, you may find that the assignment elicited a cognitive or performance outcome that you did not include in the original rubric. In this case, add it as an evaluative measure. If students helped to devise the original rubric and begin to question one of the criteria as they work on the assignment, consider the validity of their concerns and revise the rubric. If you are uncomfortable revising it midstream, note the change and include it before using the rubric again. Rubrics, like learning, are dynamic and should always reflect the most important measurable outcomes. Sometimes those are refined as learning is taking place.