Universiteit Leiden

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Plagiarism

What is plagiarism?

The Netherlands Code of Conduct for Research Integrity defines plagiarism as ‘the use of another person’s ideas, work methods, results or texts without appropriate acknowledgement’. The definition at Oxford University is somewhat more extensive: ‘Plagiarism is presenting someone else’s work or ideas as your own, with or without their consent, by incorporating it into your work without full acknowledgement. All published and unpublished material, whether in manuscript, printed or electronic form, is covered under this definition. Plagiarism may be intentional or reckless, or unintentional. Under the regulations for examinations, intentional or reckless plagiarism is a disciplinary offence.’

How does Leiden University deal with plagiarism?

Leiden University considers plagiarism to be a serious offense. In the Regulations on Plagiarism you can read what the University means by plagiarism and what the possible consequences of plagiarism are.

What is self-plagiarism?

Although there are differing opinions as to the correctness of the term 'self-plagiarism', it is understood to mean the following. The Netherlands Code of Conduct for Academic Practice describes it this way in paragraph 1.5: ‘Academic practitioners do not republish their own previously published work or parts thereof as though it constituted a new contribution to the academic literature. When republishing previously published findings, they indicate this with a correct reference to the source or by another means accepted within the discipline. In many disciplines it is permissible and even customary to reprint short texts from works published with or without co-authors without a source reference when it concerns brief passages of introductory, theoretical or methodological explanation.’

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