Check for plagiarism in a CodeGrade assignmentΒΆ

CodeGrade has integrated state of the art plagiarism software powered by JPlag to find possible plagiarism cases in CodeGrade assignments. This guide will walk you through setting up a plagiarism run.

  1. Go to the Assignment Management page for the assignment you want to do plagiarism detection on by clicking on the button.

  2. On the Assignment Management page, navigate to the Plagiarism tab. This is where plagiarism checks can be run and where previous plagiarism checks can be reviewed.

  3. Set up the options to apply to your assignment:

    • Language: Language of the code in the assignment.

    Note

    Please contact us if your required language is not present in this list.

    • Suffixes to include: Comma separated list of suffixes of files to include in the check. Leave empty to use the default suffixes for the selected language.
    • Minimal similarity: The minimal average similarity to include in the results, the default is an average of 25%.
    • Old assignments: Optionally one or more previous CodeGrade assignments can be selected, so that submissions from these assignments are included in the plagiarism check.
    • Old submissions: Optionally an archive with assignments or codebase can be uploaded to be included in the plagiarism check.
    • Base code: Optionally an archive with code to be excluded in the plagiarism check can be uploaded to reduce false positives. Use this to upload e.g. a framework used by all students.
  4. Click the Run button to start the plagiarism check. A new entry will be created above the option fields and will display the progress.

  5. When the plagiarism check finished, press the plagiarism run entry to display an overview of detected plagiarism cases.

  6. The following Plagiarism Overview page displays an overview of all plagiarism cases between students (or optionally between supplied old code). Click on any row to investigate the specific case.

  7. The Plagiarism Comparison shows two code views with the files that contain potential plagiarism, the actual individual plagiarism cases are highlighted with a colour corresponding to the colours in the top menu. Press these to compare manually.

Note

Click the Export button on the top right hand corner to export a plagiarism report. Plagiarism cases will be exported in LaTeX format, so that additions and further comments can be added before exporting as PDF.