In most cases, plagiarism is unintentional, and most cases of unintentional plagiarism result from taking poor notes or failing to use notes properly. You are plagiarizing if you
Although unintentional plagiarism is, by definition, something that the writer hasn’t planned to do, it is nonetheless a serious issue and, when detected, is likely to have consequences. Some instructors might require that an assignment be rewritten; others might impose a penalty, such as a lowered or failing grade.