Hi Ali
We experienced a similar problem with one or two of our assignment links
(integrated through Blackboard Vista), but this was within the same
assignment but differing students i.e. it was not detecting collusion within
a cohort. The same principles should apply using the same student and two
distinct links however.
At the time we put this down to the submission times being very close and the
assumption being that there is a delay between submitting to TII and being
'searchable' in the student paper repositry database. You will probably find
that when the assignment due date comes around the percentages in both links
will leap up to 100%, due to that fact that TII will refresh all originality
reports at this point. Or you could refresh the originality reports manually
to see if they update with the expected percentage.
In terms of how you set the link up it all seems fine, and I'm sure you would
not have set the later created link to a revision assignment of the first :)
Not sure it that helps in anyway!
All the best
Rob
P.S. We also had one case with an assignment that just did not detect matches
to student paper DB in any way. That one was raised with the TII helpdesk but
we never really got a clear cause of the problem.
Rob Bourne
Turnitin Administrator
School of Computing & Technology
_____
UELconnect
University of East London
Romford Road
London E15 4LZ
Tel: +44 (0)20 8223 6479
Fax: +44 (0)20 8223 2824
http://www.uel.ac.uk/uelconnect
The School of Distance & E-learning and UEL Extra
amalgamated on 1st July 2008 to form UELconnect.
-----Original Message-----
From: Plagiarism [mailto:[log in to unmask]] On Behalf Of Ali Press
Sent: 09 October 2008 13:55
To: [log in to unmask]
Subject: Turnitin not detecting self-plagiarism??
I'm having the following problem with Turnitin:
We're using Turnitin via the powerlink in WebCT. In one WebCT course I've
set up two Turnitin assignments - both have the following settings:
*submit papers to standard paper repository
*search student paper repository
*search current and archived internet
*search periodicals, journals, & publications
Using a test student account I've uploaded the same file to each of the
Turnitin assignments and got exactly the same similarity score - 14%.
Surely Turnitin should have also picked up the similarity between the two
uploaded files and not just just between the file and other external sources?
Also, the file was pretty similar to another file I uploaded (using a
different test student account) a couple of weeks ago - again Turnitin didn't
spot this similarity.
In another WebCT course, I have another Turnitin assignment set up with the
same options as above. I uploaded the file again and once again I got a
similarity score of 14% - Turnitin had not noticed the file is identical to
the one I had previously uploaded.
Turnitin doesn't appear to not be uploading files to the student paper
repository. It does appear to be checking the student paper repository as
the file I uploaded had a 1% match to a student paper uploaded at Leeds Met.
Has anyone else had this problem?
or
Is there something I'm doing wrong?
Best wishes,
Ali
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