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The American debating style is loosely based on the procedures of the British Parliament, emphasising argumentation and rhetoric rather than detailed technical and factual knowledge (cf. American Parliamentary Debate Association 2013).
Each team consists of two members and a spokesperson who ensures compliance with the rules during the rounds and addresses the judge from then on. One team stands for the government, the other for the opposition
In the opening statement, the government presents a motion/case which the opposition must present as incorrect. The two speakers from the government and the opposition each speak in turn (cf. ibid.). The speaker decides at the end of each round, based on the arguments made in that round, whether the government has proved its motion/case or the opposition has disproved it. The team whose arguments are more convincing wins (cf. ibid.).
New arguments can be held at any time during the first four rounds. New arguments cannot be made during rebuttal, the last two rounds. However, the Prime Minister can respond to new arguments from the opposition, so the rebuttal speech provides new answers but does not present new arguments (cf. ibid.).
This is a means used by all debaters and the audience to point out inconsistencies, argumentative gaps, aberrations and the like to the speaker and to encourage clarification. However, this means may only take place during the first four rounds (cf. ibid.).
American Parliamentary Debate Association (2013): Guide. Rules. In: http://www.apdaweb.org/guide/rules [Access on 09.10.2015].