Guide
Types of plagiarism
Plagiarism takes many forms, from copying text word for word to reusing your own past work or buying an essay — all share a failure to credit the true source of words or ideas.
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Verbatim and mosaic plagiarism
Verbatim, or direct, plagiarism is copying a source word for word without quotation marks or a citation, passing the original author’s exact wording off as your own. It is the most clear-cut form. Mosaic plagiarism — also called patchwork plagiarism — is subtler: the writer weaves phrases and sentences from one or more sources into their own text, perhaps swapping the odd word or rearranging clauses, but without quotation marks and often without citation. Because the result reads as original prose, mosaic plagiarism can be unintentional, arising from sloppy note-taking, yet it is still plagiarism because the borrowed wording is not properly marked or credited.
Paraphrasing without attribution and self-plagiarism
Restating a source in your own words is legitimate scholarship — but only if you cite where the idea came from. Paraphrasing without attribution means putting another author’s argument or finding into fresh wording while omitting the citation, so the reader believes the idea is yours. The change of words does not erase the debt; the idea is still borrowed. Self-plagiarism is reusing your own previously submitted or published work — a whole essay, sections, or data — as if it were new, without disclosure. It can mislead assessors about how much fresh work was done and, in publishing, can breach copyright and inflate a record, which is why journals and COPE treat redundant publication as a misconduct issue.
Accidental and source-based plagiarism
Not all plagiarism is deliberate. Accidental plagiarism arises from carelessness rather than intent — forgetting a citation, misplacing quotation marks, muddling paraphrase with copied text in your notes, or misunderstanding the rules. Source-based plagiarism concerns how sources are handled: citing a source you did not actually read, citing a secondary source as if it were the original, attributing information to the wrong source, or inventing a source that does not exist (sometimes called source fabrication). Most institutions judge plagiarism by the act, not the intention, so "I did not mean to" rarely excuses it. Good note-keeping and careful referencing are the defence against these honest mistakes.
Contract cheating
Contract cheating is the most serious form: outsourcing your assessed work to a third party — a friend, an essay mill, or increasingly an automated tool — and submitting it as your own. Unlike copying a passage, the entire piece is not the student’s work, so it strikes at the heart of what a qualification certifies. It is hard to detect with text-matching software because the work is original, which is why many institutions and governments treat it as a distinct and grave breach, and several jurisdictions have moved to outlaw the essay-mill services that enable it. Whatever the mechanism, the principle is the same: the work submitted must genuinely be the student’s own.
Why naming the type matters
Distinguishing these forms is not academic hair-splitting; it shapes both how breaches are judged and how students avoid them. Institutions often weigh intent and seriousness — an accidental missing citation is handled differently from deliberate contract cheating — even though both are recorded as breaches of integrity. For the writer, knowing the categories turns a vague fear of "plagiarising" into concrete, avoidable behaviours: quote and cite direct wording, credit every paraphrased idea, disclose reused work, keep meticulous notes, and never submit work that is not your own. Understanding the types is the first step toward writing with confidence and integrity.
Key facts
At a glance
- Definition: presenting others’ words or ideas as your own without credit
- Verbatim: copying text word for word without quotation marks or citation
- Mosaic: stitching borrowed phrases into your own text (patchwork)
- Self-plagiarism: reusing your own past work as if it were new
- Source-based: citing unread, wrong, secondary-as-primary or fabricated sources
- Contract cheating: outsourcing assessed work to a third party — the gravest form
Common questions
FAQ
Is paraphrasing without a citation still plagiarism?+
Yes. Putting a source into your own words does not remove the need to credit it, because the underlying idea or finding is still borrowed. A paraphrase that omits the citation lets the reader believe the idea is yours, which is plagiarism of ideas. Paraphrase properly and add the citation, and it becomes legitimate scholarship.
Can you plagiarise your own work?+
Yes — this is self-plagiarism. Reusing your own previously submitted or published work, in whole or part, without disclosure can mislead assessors about how much new work was done and, in publishing, may breach copyright or inflate a record. If you want to draw on earlier work, cite it and check whether reuse is permitted.
Does plagiarism have to be intentional to count?+
No. Most institutions judge plagiarism by the act rather than the intention, so accidental plagiarism — a forgotten citation or misplaced quotation marks — still breaches integrity. Intent may affect how seriously a case is treated, but it rarely excuses it. Careful note-keeping and referencing prevent these honest mistakes.
