If we submit more than once a document into turn-it-in the second time we submit the same document it will result with a higher similarity index if compared to the first time. Why does this happen?
Here's a description of turnitin from wikipedia to clarify my question:
Turnitin is an Internet-based plagiarism-prevention commercial service created by iParadigms, LLC, first launched in 1997. Typically, universities and high schools buy licenses to submit essays to the Turnitin website, which checks the documents for unoriginal content. The results can be used to identify similarities to existing sources or can be used in formative assessment to help students learn how to avoid plagiarism and improve their writing.[1]
Students may be required by schools to submit essays to Turnitin, as a deterrent to plagiarism. This has been a source of criticism, with some students refusing to do so in the belief that requiring it constitutes a presumption of guilt. Additionally, critics have alleged that use of this proprietary software violates educational privacy as well as international intellectual property laws, and exploits students' works for commercial purposes by permanently storing them in Turnitin's private database.
Parent company iParadigms LLC, also offers a similar plagiarism detection service for newspaper editors, book and magazine publishers called iThenticate, and runs the informational website Plagiarism.org. Other tools included with the Turnitin suite are GradeMark (online grading and feedback) and PeerMark (peer review) services. Turnitin released the WriteCycle Suite on February 3, 2009. WriteCycle bundles the Originality Checking service with its GradeMark online grading tools and PeerMark tools. Turnitin released Turnitin2 on September 4, 2010, dropping the "WriteCycle" nomenclature.[2]
Hi,
It shouldn't happen. I haven't experienced anything like that before.
From what I understand, Turn-It-In uses the documents submitted to it in addition to ones available online to evaluated documents for plagiarism. This means that submitting a document a second time should have a higher result due to it being compared and hypothetically identical to the previous submission regardless of it still being your own work.
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