There is a range of information duplication and overlap that occurs due to the nature of stand-alone knwoledge entities and how they are produced. Because stand-alone knowledge entities are self-contained pieces of information, they will often use information used in other knowledge entities to contextualize their subject. This is a weak form of knowledge entity duplication because it is not a direct copy of other knowledge entities. Rather, they often summarize or paraphrase information covered in other knowledge entities causing an overlap of content. However, in some cases information can be duplicated in its entirety.