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Determine the objective of the assignment. Rubrics are generally used for longer assignments or projects that involve multiple sections or parts that will require a certain amount of subjectivity in the grading. In other words, you wouldn't use a rubric for a multiple-choice test but you might use one to grade an essay or a presentation. Articulating the particular goals of the project to be graded is helpful in coming up with the more specific things you'll look for in evaluating it. Consider the following questions:
What is the main purpose of the assignment you're grading?
What are the students supposed to have learned by completing the assignment?
How will you recognize a successful assignment?
What makes a project stand out?
What's "good enough"?