Plagiarism in Academic Research

Citing something is necessary but not sufficient. If you copy exact wording, you must use quotation marks AND cite the source. Direct quotation + citation is acceptable. Direct copying without quotation marks, even with a citation, is still plagiarism (it is called 'citation plagiarism' or 'patchwriting'). The quotation marks signal to readers that these are not your words.

You must cite any paraphrase of someone else's idea, method, or findings—regardless of how much you change the wording. Changing words but keeping the core idea is still using their intellectual work and requires citation. The citation acknowledges the idea's source; the paraphrase shows you understood it. There is no word-count threshold below which citation is not required.

Yes, in most research ethics definitions. If you republish substantial text from your own prior published paper without disclosing the prior publication, it inflates your output and is considered duplicate publication (a form of plagiarism). However, reusing your own methods description is often acceptable if disclosed ('we used the same protocol as in [your prior citation]').

Unintentional plagiarism (e.g., lost track of source, taught by institution with different citation norms, first-time mistake) usually results in correction or erratum rather than retraction. However, it is still investigated to confirm intent was absent. Repeated unintentional plagiarism becomes evidence of carelessness and may be treated as misconduct. Intentional plagiarism leads to retraction and formal sanctions.

No. Tools are best at finding verbatim copying from indexed, digitally available sources. They struggle with paraphrasing, translated plagiarism, ideas not yet published, and sources not in their databases (e.g., old books, grey literature). Manual review by human editors catches additional plagiarism through careful reading and subject expertise. Both automated and manual checking are needed.