My son (lower sixth) did a single Open University module earlier this year and has just had the results. He was awarded a pass, but was warned that the OU plagiarism software had picked up a high level of correspondence between his assignment and one by another boy at the same school. There is no doubt about this - they sent a printout and whole paragraphs are identical.
Of course, I only have my son's version of this, but he says he did work together with the other boy. He has copies of emails he (my son) sent him (the other boy) with drafts of his own work, one about 10 days before the deadline and one around the time of the deadline. He has to send the OU an explanation in the next 10 days. He will be asking advice from teachers at school today, although he did the module as an individual rather than through the school.
Any advice on elements which will support his case, please, so it isn't just one word against the other? Will a dated email count? And if there is not enough evidence and they are both penalized, is it likely to be 5% off so he might still pass, or a complete fail? When the dust settles, I will have a gentle word with him about not giving other people drafts of your work, but I think the message has got across already. A salutory lesson at an early stage, I keep telling myself. Many thanks in advance for any advice you can give.