Decide what criteria or essential elements must be present in the student’s work to ensure that it is high in quality. At this stage, you might even consider selecting samples of exemplary student work that can be shown to students when setting assignments.
Decide how many levels of achievement you will include on the rubric and how they will relate to your institution’s definition of grades as well as your own grading scheme.
For each criterion, component, or essential element of quality, describe in detail what the performance at each achievement level looks like.
Leave space for additional, tailored comments or overall impressions and a final grade.