"When writing to persuade, writers employ a variety of persuasive strategies. One common strategy is an appeal to the credibility, character, or authority of the writer (or speaker). When writers establish that they are knowledgeable and trustworthy, audiences are more likely to believe what they say. Another is an appeal to the audience's self-interest, sense of identity, or emotions, any of which can sway an audience. A logical argument, on the other hand, convinces the audience because of the perceived merit and reasonableness of the claims and proofs offered rather than either the emotions the writing evokes in the audience or the character or credentials of the writer." (National Governors Association Center for Best Practices‚ Council of Chief State School Officers, 2010, p. 24)
Debate extends beyond the role of discussion in that it is not only a negotiation toward common understanding, it has the additional aim of having others evaluate your understanding as correct.