Clearly, once teachers insert all their comments into the GCB, they will save time compared to red-inking a stack of papers. As detailed above and in side-by-side timings, e-C will save significantly more time than using the GCB while providing students comments that identify, explain, and show how to revise. If all you want to do is error mark, GCB will do nicely; if you want your students to learn from your comments, e-C is for you.
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