The results under reviewers indicate the student's results for giving feedback. 

Completeness: This is based on 2 things. Did the student give feedback to all the submissions they were assigned (75% of the score) and did they give reactions to all the feedback they have received (25% of the score).
The constructive score is based on the five-point feedback reaction scale. The score is averaged across the reactions from the students who have received feedback from John. 

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