I find the following good questions to ask when designing a rubric,
To ensure rubric reliability, instructors should ask themselves the following questions as they are developing assessment rubrics and, if possible, test and re-test the rubric prior to implementation.
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Are all scoring categories well defined?
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Are all scoring categories connected to learning outcomes?
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Are all scoring categories associated with clear criteria?
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Are there clear differences between the criteria (i.e., expert, intermediate, novice)?
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Would two different instructors using the rubric arrive at the same score when assessing student work?