I learned several situations, which I did not realize and regard it as a plagiarism, could be accused by plagiarism. The most difficult and tricky question was the problem given by the Northwestern University. This is a kind of question that comparing two articles and distinguish whether the second draft plagiarized or not. I thought the second draft paraphrased well, because a writer used the first draft for references for writing, and it seemed like both articles were written totally different. But the second aritcle used original idea from the first article therefore it regarded as a plagiarism. Before I took this test, the plagiarism is just copying other's words on one's paper, but I realized that using other idea on one's assignment is also regard as a plagiarism. Also I can see from the answer from different question, I use a idea from group disscussion, but not from induvidually task.