First of all, for undergraduates, their papers usually pay more attention to the mastery and application of basic knowledge than to in-depth research and innovation. Therefore, for undergraduate thesis, the school usually sets a relatively high duplicate checking rate standard, such as 30% or 40%. This is because undergraduates may cite more materials in the process of writing, and if these references are not processed, the duplicate checking rate may be too high. In addition, undergraduate thesis usually does not need strict academic review, so it has a high tolerance for plagiarism.
But for master students and doctoral students, their papers usually need in-depth research and innovation, so the tolerance for plagiarism is very low. Generally speaking, the check-up rate for master students will be set at 10% or 20%, and doctoral students may be lower. This is because the dissertations of master students and doctoral students need to show their deep understanding and independent thinking ability in the research field. If they plagiarize a lot, their academic achievements and research ability will be seriously affected.
Secondly, undergraduates and master students are different in the use of duplicate checking tools. Generally speaking, some basic tools are mainly used for duplicate checking of undergraduate papers, such as Turnitin or HowNet. These tools can detect direct plagiarism and partial rewriting plagiarism in papers. However, for master's and doctoral students' papers, it may be necessary to use more advanced and professional duplicate checking tools, such as iThenticate or CrossCheck. These tools can not only detect direct plagiarism and partial rewriting plagiarism in papers, but also detect complex plagiarism forms such as self-plagiarism and hidden quotations in papers.