SWoRD [scaffolded writing and rewriting in the disciplines], a web-based application developed by Cho and Schunn.  It has students respond to writing by rating it and giving comments in three areas: prose flow, logic, and insight. Cho, Schunn and a number of others have studied the differences between student and instructor comments. They have also run validation studies trying to determine how many student reviews are needed to be as valid as instructor comments. Their conclusion is five to six.

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