Turnitin

Turnitin is an online plagiarism prevention system that makes it easy to identify work submitted that is unoriginal work.
Customized "Originality Reports" provide:
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exact duplicates of submitted papers
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underlined and color-coded text that was copied or paraphrased from the Internet or a database
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links to the original online source of copied or paraphrased text
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the ability to determine the extent to which a work is plagiarized or is original
Submitted papers are compared to Internet content and to a database of previously submitted student papers (including other institutions across the United States using Turnitin).
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Note: Student and Instructor Quick Start Guides are available on the Turnitin site.