From a US educational blog here is some research done by MIT about the impacts of students' copying each other's homework rather than doing it themselves...
http://blogs.edweek.org/teachers/webwatch/2010/03/the_cost_of_copying_homework.html
And what can teachers do to dissuade students from copying?
"Providing more instructor contact, giving shorter and more frequent assignments, switching from pass-no record to grades, and discussing the correlation of copying and course performance with students" were all suggestions in the MIT report. During the study, the researchers found that these changes to a course's format reduced homework copying by a factor of four.
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