I have found it to have some usefulness but definitely with some hassles. The 
most important limitation (for most of the types of papers I assign) is that 
it will not detect copying from journal articles or books. So you have to 
continue to do plagiarism control the old fashioned way here (have them turn 
in the sources or whatever). If you mostly have students do research papers, 
turnitin would not be much use. 
I think it has some benefits. First, I think there is quite a bit of 
plagiarism from papers from previous semesters. Even if assignments are 
changed, there is probably still overlap (especially when students are allowed 
to chose their own topics). Turnitin can handle this type of plagiarism very 
well but only if you routinely have students submit all their papers to 
turnitin. I used to do that - I simply had students submit a electronic copy 
(which was uploaded to turnitin by a staff person) and a regular paper copy 
(which I graded as usual). Turnitin produces a very easy to use report. 
Second, if you do any assignments in which webpages could be helpful, turitin 
can be a useful resource. Although Google may do the same, I'm simply not 
going to check every word of every paper. With the uploading of all papers, 
this is what turnitin does. Third, students pay very careful attention when 
you tell them about this resource. They don't know what it does exactly or 
what it might do in the future, so I think there is some significant 
preventive value even for the type of plagiarism that it can't really check 
(such as journal articles).
In the end, is it worth it? I have reviewed quite a bit of the cheating 
literature and I think that instead of software you need an attitude change 
among students and also faculty. This kind of ethos change takes a whole lot 
more work than buying software.

Marie

Marie Helweg-Larsen
Associate Professor
Dickinson College



>===== Original Message From "Stephen Black"  =====
>I've just been volunteered by my university to look into the cost-
>effectiveness of subscribing to a plagiarism detection service, such
>as turnitin.com.
>
>Naturally, I turn to you people for advice.
>
>I just browsed their website. It seems to me rather complicated to
>make use of, although I suppose it gets easier once you understand
>how it works. But I would think this would limit the number of
>instructors who would be sufficiently motivated to make use of it in
>their courses.
>
>They offer three options for subscribing: individual, department, or
>university-wide. However, they were rather coy on pricing, and you
>have to submit a request to get this information (which I haven't yet
>done).
>
>It seems to me that what they claim as their primary function--
>detecting passages plagiarized from the Internet--can be easily
>duplicated without all the associated bother and expense just by
>typing a few suspected passages in quotes into Google. This works
>great, actually.
>
>So the question is: do they offer anything more? They also maintain a
>database of papers submitted to them for analysis. However, my guess
>is that this would be valuable only if recyling of papers (handed on
>from one student to another)  are a concern, and would be effective
>only after a university had subscribed and submitted many papers to
>their database.
>
>One benefit I thought they might have would be the ability to look
>within the databases of papers-for-sale sites, which Google wouldn't
>be able to access. In other words, I thought that perhaps they could
>detect purchased papers as well as those freely available on the
>Internet. But I don't see that they make this claim so it's probably
>not true.
>
>Bottom line: I'd like to hear (publicly, preferably) opinions on
>this, particularly from people who have used turnitin.com or a
>similar service, particularly at a small university such as ours.  Is
>it better than googling? Is it worth the hassle to use it? Is it
>worth the price?
>
>Please tell.
>
>Stephen
>
>______________________________________________________________
>Stephen L. Black, Ph.D.            tel:  (819) 822-9600 ext 2470
>Department of Psychology         fax:  (819) 822-9661
>Bishop's  University   	       e-mail: [EMAIL PROTECTED]
>Lennoxville, QC  J1M 1Z7
>Canada
>
>Dept web page at http://www.ubishops.ca/ccc/div/soc/psy
>TIPS discussion list for psychology teachers at
>http://www.frostburg.edu/dept/psyc/southerly/tips
>_________________________________________________________
>
>
>
>
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-- 
*********************************************
Marie Helweg-Larsen, Ph.D.
Associate Professor of Psychology
Dickinson College
Carlisle, PA 17013
Office: (717) 245-1562, Fax: (717)) 245-1971
*********************************************
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