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58 lines
2.1 KiB
Plaintext
58 lines
2.1 KiB
Plaintext
The software and text similarity tester SIM
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SIM tests lexical similarity in texts in C, Java, Pascal, Modula-2, Lisp,
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Miranda, and natural language. It is used
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- to detect potentially duplicated code fragments in large software projects,
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in program text but also in shell scripts and documentation;
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- to detect plagiarism in software projects, educational and otherwise.
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SIM is available through ftp. The directory
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ftp.cs.vu.nl:pub/dick/similarity_tester
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contains the sources (in C) and the MSDOS .EXEs.
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The software similarity tester is very efficient and allows us to compare
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this year's students' work with that collected from many past years (much to
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the dismay of some, mostly non-CS, students). Students are told in advance
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that their work is going to be compared, but some are non-believers ...
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The output of the similarity tester can be processed by a number of shell
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scripts by Matty Huntjens. These shell scripts take sim output and produce
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lists of suspect submissions, histograms and the like.
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The present version of these scripts is very much geared to the local situation
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at the Vrije Universiteit, though; they are low on portability.
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Matty Huntjens' email address is matty@cs.vu.nl.
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We are not afraid that students would try to tune their work to the
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similarity tester. We reckon if they can do that they can also do the
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exercise.
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Since this piece of handicraft does not qualify as research, there are no
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international papers on it. A paper, titled `Detecting copied submissions in
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computer science lab work', was published in a local (i.e. Dutch) computer
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science journal:
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%A Dick Grune
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%A Matty Huntjens
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%T Het detecteren van kopie\(:en bij informatica-practica
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%J Informatie (in Dutch)
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%V 31
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%N 11
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%D Nov 1989
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%P 864-867
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The ftp directory contains a terse technical report about the internal
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working of the program.
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Dick Grune
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Vrije Universiteit
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de Boelelaan 1081
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1081 HV Amsterdam
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the Netherlands
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dick@cs.vu.nl
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+31 20 444 7744
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----------------------------------------------------------------
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With infinitely many exceptions, what you do makes no difference.
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