Last-minute thinking has no chance to develop or complexify or be tested for logic, accuracy, and the like. Revised writing is always better than rough draft. Unrevised rough draft, on the other hand, is only half as good as what you could have done with more time. Students usually have a choice in the matter. Other schemes are also possible, but in any case it is usually a good idea to begin with a statement of what you want to say or do in the paper.
Plagiarism is the unacknowledged use of another writer s words or ideas.
Not to acknowledge such borrowing is plagiarism. If in doubt as to whether or not to give credit, give credit. According to U of I policy, plagiarism is a type of theft and is punishable by failure in the course for which the plagiarized work was turned in. Most plagiarism, though, is not really theft but is, rather, something done by accident. Accidental or unintended plagiarism results from a lack of awareness of the need for acknowledgment of sources and a lack of awareness of the proper forms for that acknowledgment.