Symptom

Student submits paper once, revises, then submits again. Originality Index of the revised paper is higher than the original paper.

Cause

Most likely, Turnitin is comparing the revised paper to the initial submission.

This happens because:

• (in Turnitin) the default is to finalise on first submission.
  
  • Instructors may miss the option for not finalising Originality Report on submission as the option is located in Optional Settings.
    
    
• (in IVLE) the student submits different versions of one paper to the submission folder using different file names.
  • Student ignores warning in IVLE that resubmissions should use the same file name.
  • Turnitin then treats the two versions as separate, comparing the recent one to the one previously submitted.
    
    
• (in Quick Submit) the staff checked the Add file to Turnitin's repository option.
  • Once a file is added to Turnitin's repository, the submission of a revised paper is checked against the earlier submission.

Solutions

1. You can exclude the source leading to the skewed Originality Index, OR
   
   
2. Request paper removal from Turnitin repository (login with NUSNET ID and password).
   1. Important notes on requesting paper removal.

Finally, please configure these settings if you have not done so:

• In Assignment Settings, expand Optional Settings, then choose Generate Originality Reports for student submissions immediately (can overwrite until due date).
• For Submissions to this assignment will be stored in..., select Do not store the submitted papers.