I use this when students work in groups to evaluate and adjust each group member's score based on their individual contributions.
How I do this in my classroom is by saving the last 10 points of a project for peer evaluations. If a project is worth 100 points total, the last 10 points are based on the average score of peer evals and the other 90 points are based on the content turned in. This allows a student who did most of the work to potentially get a better score than a group member who contributed very little.
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