Vanessa Fairhurst and Susan Collins present an introduction to Crossref's Similarity Check service. The presentation covers what is meant by plagiarism, how to use Turnitin's iThenticate tool, and how to participate in the Crossref service with information about fees and where to find further help.
Who is already
Our Similarity Check service offers publishers with a way to actively engage in
efforts to prevent plagiarism.
Members are provided with access to Turnitin’s powerful text comparison
tool, iThenticate. This allows them to compare their own documents against the
largest comparison database of scientific, technical and medical content in the
Similarity Check members contribute their own published content into iThenticate’s
database of full-text literature.
• Turnitin’s plagiarism detection
• Text-based screening
• Contains content indexed from over
1 billion web pages, 57 million items
from Crossref members, and a
further 105 million items from other
content partners such as Pearson,
Cengage, EBSCOHost etc.
What is iThenticate?
How the service works
• Upload a document to iThenticate
• A similarity report is produced
• Compare side-by-side
• Editor makes a decision about
whether the similarity detected is
legitimate or if further investigation is
• When members publish new content,
they provide a link to their full-text
which Turnitin use to index the item
and add it into their database
Who’s using Similarity Check?
Over 1,700 participating Crossref members
Average 298,962 manuscripts screened every month this year
Increase in usage from publishers in Japan, Brazil, South Korea and Turkey
Publishers are putting more time and effort into their plagiarism policies
• resources (staff and time)
• follow-up action
• Doc-to-doc comparison allows
users to upload one primary
document and compare it
against up to five other
What issues are publishers looking for
• Poor, missing, or incomplete references (can be fixed)
• Self-plagiarism/text recycling (can be fixed)
• Unattributed use of parts of another person’s work
• Submitting another person’s work as your own
• Is the author attempting to mislead/misrepresent?
How to join
Are you eligible?
X Abstract only/landing
pages won’t work
X PDF Readers won’t
★ PDF downloads are the
What are full-text URLs?
What if my articles are paywalled?
• It’s okay if your articles are behind a paywall,
we still need full-text URLs
• Whitelisting Turnitin’s IP
• Only Turnitin will have access to the full-text
How much does it cost?
• Annual administrative fee equal to 20% of your Crossref membership fee, paid to Crossref along with your annual
• Each document run through Similarity Check is charged at a per-document-checking fee. There is a separate invoice
for Similarity Check document checking fees.
• If you work with a sponsor, they’ll receive the invoices for your use of the service.
• Invoices for the per document checking fees Similarity Check service will be sent, from Crossref, in January (for the
previous year). You can check how many documents you’ve checked in the Reports section in iThenticate.
• If you’re a member who works with a sponsor, and you want to change to
work with another sponsor, the new sponsor needs to be using the service
for you to continue to have access to it.
• iThenticate checks are integrated into the main manuscript submission
systems (ScholarOne, Editorial Manager, eJournal Press).