What a time saver!
I just tried the app today and graded 100 papers very quickly. The students loved getting the immediate feedback. I also used it in a formative fashion by allowing the students to retry the problems that they got wrong for half credit. Another teacher liked the item analysis feature. Imagine grading quickly everybodys quick quiz in class and finding out almost everyone got problem number 7 wrong. Now that makes data useful!
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ZipGrade VPP