Everyone has to address this question for themselves. You could just as well ask, “Do I need a spare wheel in the desert?” So a plagiarism check is not mandatory, but it’s definitely recommended by many institutions. After all, you’ve spent a lot of time preparing your thesis. You’ve tried to follow the guidelines: font, font size, citation styles, bibliography conventions, etc. In addition, you undertook a great deal of research, possibly conducted interviews and had them transcribed and arranged.
But unfortunately, you may have overlooked that one place in your work that you hadn’t mark as “cited”. This can be interpreted as plagiarism – result: a failed paper.
This is where our “spare wheel” comes into play: with the plagiarism check, possible plagiarism can be identified in advance, and the risk of being confronted with an accusation of plagiarism is then vanishingly small.
So, do you need a plagiarism check – in other words, to have your thesis, term paper or dissertation checked for possible instances of plagiarism? We’d certainly recommend one.
Note: According to some students we’ve worked with, final theses at their university are no longer checked for plagiarism only on a random basis, but consistently. For this reason, we think a plagiarism check should be an absolute must.