Lack of Technical Awareness: Students may simply be unfamiliar with the appropriate documentation requirements for their field. Brief in-class refresher sessions can get students on the right track; stressing that the correct citation standards for the particular field are vital for establishing the credibility and professionalism of their work can also help. Try to encourage writers to see documentation of their work as an integral part of the research process, rather than some tedious "add on" at the end.
The UWC has several handouts that deal with paraphrasing, quoting, and crediting outside sources; our in-house library also has documentation manuals for all major styles.
Lack of Awareness of Writing Expectations: Students may plagiarize because they are confused by what constitutes originality in ideas or information. It is important to consider that plagiarism is defined by the context of the writing: what may be considered plagiarism in one circumstance may not be a problem in another. For instance, plagiarism in usually defined as presenting another's ideas as one's own, but many kinds of groupwork and team writing involve collaborative effort that builds upon the contributions of individuals. University researchers, for instance, often rely on grad assistants who may not be acknowledged in the final published work. In addition, students from other cultures may be accustomed to different standards in using the work of others.
The idea of context defining plagiarism boils down to expectations of purpose and audience in an assignment. For instance, consider the following example (from Klooster and Bloem's The Writer's Community, pg. 152):
A student is assigned to write a research paper about the legality of local rave clubs. He's about to go to the library to look for background information when his roommate says, "I wrote an essay on that same topic last year, and I have all my research notes. You can just use those instead of wasting time getting all those articles yourself." The student reads the notes and writes his paper based upon this information.
Although the writer above has written the essay himself, part of the expectation in a standard research paper assignment is that the writer will engage in legitimate research about the topic, and so construct meaning in an authentic way. The audience expects that the writer has maintained integrity in locating, reading, and considering the research material himself, all in an effort to present insight in an honest and knowledgeable way. This effort establishes credibility through a particular construct of expectations involved with academic inquiry. Thus, the plagiarism in the example above is a violation of the trust between the writer and the reader, a breakdown of ethical connection.
In a broader sense, then, plagiarism refers to any action that abuses the faith an audience invests in a writer's efforts.
Poor Planning: As much as we'd like to hope that students will make researching, drafting, and revising a priority, the reality is that some will not. Confronted with a looming deadline and hopelessly behind in their work, students may plagiarize out of sheer stress and despair. By making assignment stages clear and assigning due dates for particular sections, instructors can head off the tendency to plagiarize through desperation (see Structuring the Assignment below).
The Student Has Nothing To Say: Intimidated by expert sources and unsure of how to enter into an academic discussion, some students have a tendency to develop a "what-can-I-possibly-contribute" attitude. Students may drift towards appropriating the terminology, phrasings, and opinions of others as a measure of safety, feeling they have no authority or voice of their own. To prevent this, instructors can help develop a critical confidence and voice in students by modeling effective ways to interact with texts--both through sentence-level methods of paraphrasing and integrating quotations, as well as demonstrating to students holistic ways of analyzing arguments in a discourse community, placing themselves in this field of discussion, and incorporating these views into specific contributions of their own.
Student Choice: Ideally, we want to prevent plagiarism before it happens by removing the conditions that create it. Even so, a few students may plagiarize simply because they don't care, or because they believe they can get away with it.