What is mosaic plagiarism?
Mosaic plagiarism is taking phrases from a source and working them into your own sentences without quotation marks, so that borrowed wording reads as if you wrote it. It is also called patchwork plagiarism, and it counts as plagiarism whether or not the source is cited.
The name comes from the result: a paragraph assembled from small pieces of other people’s language, held together by a few words of your own. No full sentence is copied, which is why writers often do not notice they have done it.
A worked example
The source passage below was written for this guide, with an invented author, so you can compare three versions of the same idea.
Original source
“Beavers reshape the valleys they settle in. Their dams slow fast-moving streams into chains of shallow ponds, which raise the local water table and create wetland habitat for fish, amphibians and birds.” (Okafor, 2021, p. 52)
Mosaic plagiarism
Few animals change a landscape as much as beavers, which reshape the valleys they settle in. By building dams they turn fast-moving streams into chains of shallow ponds, and this helps to raise the local water table while providing wetland habitat for fish, amphibians and birds.
The highlighted phrases are Okafor’s exact words. The writer added an opening clause and some linking words, but more than half of the passage is lifted, with no quotation marks and no citation. Adding “(Okafor, 2021)” at the end would credit the idea and still leave the wording presented as the writer’s own.
Properly paraphrased and cited
Beavers act as engineers of their surroundings. Okafor (2021) explains that a dam holds a stream back until it spreads into a series of ponds, and that the stored water lifts groundwater levels nearby and gives wetland species somewhere to live (p. 52).
The idea is the same, but the sentences are built differently and the author is named. If one of Okafor’s phrases mattered to your argument, you could keep it inside quotation marks: Okafor (2021) describes the result as “chains of shallow ponds” (p. 52).
Mosaic plagiarism vs other types
These five terms overlap, and quiz questions often ask you to tell them apart. The difference is in what the writer does with the source’s words.
| Type | What the writer does | How to recognise it |
|---|---|---|
| Mosaic plagiarism | Borrows phrases and blends them into their own sentences without quotation marks. | Short runs of the source’s exact words, scattered through a paragraph. |
| Direct plagiarism | Copies a sentence or passage word for word, without quotation marks or credit. | A whole passage is identical to the source. |
| Patchwork plagiarism, patchwriting | Patchwork: stitches together pieces from one or more sources. Patchwriting: follows a source sentence closely, swapping synonyms and reordering words. | Often treated as the same as mosaic. Patchwriting keeps the source’s sentence pattern. |
| Paraphrasing plagiarism | Restates a source’s idea in new words but gives no citation. | The wording may be original. The credit is missing. |
| Accidental plagiarism | Does any of the above by mistake, for example through careless notes. | Describes intent, not method. Mosaic plagiarism is often accidental. |
“Patchwriting” is a term from writing research, coined by Rebecca Moore Howard in the 1990s. Some writing teachers see it as a stage in learning to paraphrase and not as dishonesty, while many integrity policies still class it as plagiarism. For the full list, see our guide to the types of plagiarism.
Why it still counts, even with a citation
A citation and quotation marks make two separate promises to the reader.
- A citation says: this idea or fact came from that source.
- Quotation marks say: these exact words came from that source.
A cited sentence with no quotation marks tells the reader that the idea is borrowed and the wording is yours. In mosaic plagiarism the second part is not true. That is why a paragraph can have a citation after every sentence and still be flagged.
It also matters for a practical reason. Coursework is meant to show that you understood the material, and a paragraph built from an author’s phrases shows only that you found it.
How it shows up in a similarity report
Direct plagiarism usually appears as one solid block of highlighted text. Mosaic plagiarism looks different:
- Broken highlighting. Short matches of a few words each, separated by unmatched linking words, as in the example above.
- The same source again and again. Many small matches in one paragraph that all point to one or two sources.
- Matches next to a citation. The source is credited, but the matched words are not in quotation marks.
A similarity score is a signal for review, not proof of plagiarism. Short matches can also be technical terms, titles, common phrases or correctly quoted text. Look at each match and ask whether the words are the author’s distinctive phrasing. Our guide on how to interpret a plagiarism report walks through that judgement.
How to fix mosaic plagiarism in a draft
For each borrowed phrase you find, choose one of three fixes.
- Quote it. If the exact wording matters, put it in quotation marks and add a citation with the page number.
- Rewrite it properly. Close the source, write the point from what you understood, then compare and cite. Changing a few words in the existing sentence only produces patchwriting. Our guide on how to paraphrase without plagiarizing covers the method step by step.
- Cut it. If the sentence only repeats the source and adds nothing to your argument, replace it with a short summary and your own point.
Then check that every source you used has an in-text citation and a reference entry. The citation generator formats both.
How to avoid it next time
Mosaic plagiarism usually begins at the note-taking stage, so that is where to prevent it.
- Mark copied words in your notes. Put quotation marks around anything you copy, with the source and page beside it, at the moment you copy it.
- Keep your own comments separate. Use a different colour or column, so you can tell later which words were yours.
- Do not draft with the source open. Writing next to the original pulls your sentences toward its phrasing.
- Draw on more than one source. A paragraph that combines several sources with your own reasoning is harder to write as a mosaic of one of them.
- Check before you submit. The Plagiarism Checker Plus plagiarism checker for students is free to try and highlights matched passages with their sources, which makes scattered borrowed phrases easy to see.