In this paper we compare five tools for detecting plagiarism in source code texts: JPlag, Marble, moss, Plaggie, and sim. The tools are compared with respect to their features and performance. For the performance comparison we carried out two experiments: to compare the sensitivity of the tools for different plagiarism techniques we have applied the tools to a set of intentionally plagiarised programs. To get a picture of the precision of the tools, we have run the tools on several incarnations of a student assignment and compared the top 10’s of the results.
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