This could be useful for: (1) creating automatic summaries of each position on an issue (SparckJones, 1999); (2) gaining a deeper understanding of what makes an argument persuasive (Marwell and Schmitt, 1967) ; and (3) identifying the linguistic reflexes of perlocutionary acts such as persuasion and disagreement (Walker, 1996; Greene and Resnik, 2009;<cite> Somasundaran and Wiebe, 2010</cite>; Marcu, 2000) .