Customer support
A & S Software ConsultancySoftware for higher education
Solution

Similarity checking for assignments

Hand-ins compared with each other, with earlier hand-ins for the same subject and with the subject’s own material, inside the institution. It is part of the assignments workflow in the document locker, not a standalone plagiarism service, and it does not search the internet or published work.

Who it serves

Built for the people who run it

  • Faculty who set and mark assignments
  • Deans of Academics
  • Programme offices
  • Academic integrity committees
  • Students
The problems it addresses

What usually prompts the call

  • Copying between students in a class is noticed only when a marker happens to read two scripts together.
  • Work handed in for the same subject in an earlier year is reused and nobody can check it.
  • Hand-ins are sent to an outside service with no clear record of where students’ work has gone.
  • Students have no way to see, before the deadline, which passages of their own work match.
What it compares against

Inside the institution only

Compared

The institution’s own records

Each hand-in is compared with the other hand-ins for the same assignment, with earlier years’ hand-ins and assignment briefs for the same subject, and with the subject’s study material in the document locker. Everything stays inside the institution; nothing is sent to an outside service.

Not compared

The internet and published work

It does not search websites, journals, books or commercial databases, so text copied from a source that is not in the locker will not be found. That needs a licensed external service, and none is connected as standard. The report says what was compared, so a low figure is not mistaken for proof of originality.

Capabilities

What it does

Which of these are included in a deployment is set out in the proposal for that institution.

Switched on per assignment

Faculty tick similarity checking on an assignment and run the check from its submissions list. Each hand-in is read as it arrives, so later hand-ins are compared with earlier ones.

File types

PDF files with a text layer, Word .docx, plain text and web pages. A scanned PDF with no text layer is reported as such rather than scored.

How matches are found

Each text is reduced to fingerprints of overlapping six-word sequences, using a technique known as winnowing, and a matched run must be at least ten words long to count. Words in Indian scripts such as Devanagari are read as words, not discarded.

What is not counted

Passages in quotation marks, a closing references list and text taken from the assignment’s own brief. A phrase found across much of the subject’s work is treated as the subject’s common language.

The report

A percentage for each hand-in, with its text shown and matched passages highlighted in a colour per source, each set beside the source passage it matches.

Privacy between classes

A marker sees another student’s words only for classes they teach. A match with a class they do not teach is shown without the name or the text.

Students’ own view

Optionally, a student sees their own percentage and highlighted passages, never whose work they match, and can hand in a corrected file before the due date.

Group work

For group assignments, every member of the group sees the group’s hand-in and its report as their own.

Retention and erasure

The extracted text is covered by the institution’s retention schedule, and a student’s hand-in files, extracted text and fingerprints are removed when their personal data is erased.

Example workflow

How a check runs, start to finish

An illustration of a typical sequence. Your own process is configured during implementation.

  1. Faculty set an assignment in the document locker and switch on similarity checking.

  2. Students hand in; each file’s text is read as it arrives.

  3. If the student view is on, a student can see their own result and hand in a corrected file before the due date.

  4. After the deadline, the marker runs the check from the submissions list and sees a percentage for each hand-in.

  5. The marker opens the report for any hand-in that needs a closer look and reads each match beside its source.

  6. The marker decides what, if anything, follows, under the institution’s own academic integrity rules.

Part of OLT SIS

A capability of the document locker

Similarity checking is part of the document locker module of OLT SIS, which holds study material and assignments. It uses the platform’s students, subjects and faculty assignments. See the OLT SIS platform.

Evidence

Who we have worked with

The institutions we have worked with, and the letters they have written, are on our clients page. In a demonstration we show this module working on demonstration data.

Questions

Frequently asked

Does it check against the internet or published papers?

No. It compares a hand-in with the other hand-ins for the same assignment, with earlier hand-ins and assignment briefs for the same subject, and with the subject’s material in the document locker. Nothing is sent to an outside service, so it cannot find text copied from websites, journals or books that are not in the locker. That needs a licensed external service, and none is connected as standard.

Does a high percentage mean a student has plagiarised?

No. A match is a reason to look, not a finding. Common phrasing, a source two students both quoted without quotation marks, or agreed group work can all match. The report shows each matched passage beside its source so that the marker can judge.

What does it cost?

Similarity checking is part of the document locker module rather than a separately priced product. The cost depends on the modules you take, the number of students and the deployment model. Tell us those and we will give you a figure.

All questions

See similarity checking on your own assignments

Tell us how your faculty set and mark written work today and the demonstration will follow that.