The rubric I use allows me to assess different products using the same rigorous criteria.
Reliability:
This rubric has proven reliable as I have used it now for several years. The rubric is based on the College Board grading criteria. I am also able to use student samples released by the College Board to ensure reliability as I score the different essays. I also use the students to ensure reliability. I often have them score their own papers using the 9 Point rubric. Often, the scores match.
Validity:
The prompt or question has to be valid. For that reason, I use College Board released essay prompts to model my essay prompts. However, I have written many invalid questions because the question caused issues for students. For example, one question I asked invited, almost required, intentional fallacy in the student's arguments. Since almost all students made that mistake, I changed the prompt for the next year.
Security:
The issue with essays of course is Plagiarism. I use several things to handle this issue. First, prevention. I talk to students about this, place my policy on the syllabus, and give examples of what is and is not plagiarism. I also use past student writing samples to compare samples if I feel students have committed plagiarism. If I have evidence that students have committed plagiarism, I use the internet to search common phrases (at this time, I don't have TurnItIn), and if I find plagiarism, I use our departmental protocol.
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