That is, one can copy material up to a specific length without the author's permission, however, one still must cite the source or identify the author. There are various reasons why a student or researcher may fall afoul of plagiarism. A common cause of plagiarism is ignorance especially of the more subtle forms of plagiarism that do not result in exact copying. Careless technique or style may result in haziness about the original source. One area especially prone to this is in the area of note taking techniques and procedures of citation .
Intentional neglect is in some cases deliberate and is the more obvious form of plagiarism.
The Concise Oxford Dictionary 8 th ed. Oxford, Clarendon Press, 1990.