Petition updateDemand an independent inquiry into treatment of Jason Arday | Evidence is key

Similarity is not automatically plagiarism

Joel HalleyCarrum, Australia
Aug 19, 2026

Similarity is not automatically plagiarism

As scrutiny of Professor Jason Arday’s PhD thesis continues, an important distinction is being lost.

Plagiarism.org identifies plagiarism as using another person’s words, ideas or sentence structure without appropriate attribution. That is very different from simply finding similar text.

A similarity match does not, by itself, prove plagiarism, intention or academic misconduct.

Each alleged instance should be tested individually:

Source → Dependence → Appropriation → Attribution → Context

Was the source cited? Were the words actually copied? Was quotation required? Was it a common academic expression? Could the similarity have arisen independently?

Aggregate similarity percentages cannot answer those questions.

For Jason Arday, serious allegations deserved serious, passage-by-passage verification—not conclusions drawn merely from similarity.

Similarity is evidence to investigate. It is not, by itself, a verdict.

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