It is possible for the Similarity Index (the percentage of matching text between a submitted document and sources in the Turnitin databases) to change after you've received an initial Originality Report.
There are several reasons why this may happen:
When a paper is submitted to Turnitin, the papers are generally saved to the Turnitin student repository database. This is to ensure that if the same paper (or parts of the paper) is submitted again, Turnitin will be able to find the match and flag it as possible plagiarism.
NOTE: The instructions below are for New assignments, but if you would like to change the settings for an existing assignment, click on the class name, then the "More Actions" link for the assignment and choose the "Edit Settings" link. Finish by following steps 5-8. The new settings will only affect future submissions, and not already-submitted papers.
When creating new assignments, Instructors can choose to *not* have submitted papers saved to any database by doing the following:
There are a few reasons why matches cannot be found. They are:
The student will need to enroll in the correct class and then upload his/her paper again. As for the instructor, you can go into the newly submitted report and exclude matches to the paper that was uploaded to the previous class. That way you will be able to see the new report without seeing matches to the previous submission.
It is possible for Instructors to "move" a paper from one assignment to another within the same class when a student submitted a paper to the wrong assignment.
To transfer a paper to another assignment, please do the following:
Once the paper is moved, you will see it in the inbox for the correct assignment.
Note: It is not possible to move submissions or assignments from one class to another class, regardless if it's a master class, section class, or standard class.