In fact, it may even lead to research being duplicated across communities.
more recent work-some of it discussed in this survey-on extracting phrasal paraphrases (or patterns) does include direct evaluation of the paraphrasing itself: The original phrase and its paraphrase are presented to multiple human judges, along with the contexts in which the phrase occurs in the original sentence, who are asked to determine whether the relationship between the two phrases is indeed paraphrastic (Barzilay and McKeown 2001;Barzilay and Lee 2003;Ibrahim, Katz, and Lin 2003;Pang, Knight, and Marcu 2003).