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Copying a chunk of text into your assignment and changing only a few words
Re-using the same work for different assignments or courses (self-plagiarism!*)
Presenting someone's argument as your own original work
Re-using the same work from different semesters (self-plagiarism!*)
*self-plagiarism happens when you re-use your own work (data / text / ideas) from another module without acknowledging that previous work. This is wrong because every assignment is expected to be a fresh effort. Always discuss with your supervisor first if you intend to re-use your own previous work.
Consequences of Plagiarism
Consequences of plagiarism vary from minor to moderate to serious, depending on how high stakes the assignment is, and whether you are a undergraduate or graduate student.
Minor consequences might include a warning letter, moderate to serious include failure of a module or suspension and beyond.