Parliamentary debate (also referred to as "parli") is an academic debate event. Many university-level institutions in English-speaking nations sponsor parliamentary debate teams, but the format is currently spreading to the high school level as well. Despite the name, the Parliamentary style is not related to debates in governmental parliaments.
British Parliamentary debate 
British Parliamentary debate is very widespread, and has gained major support in the United Kingdom, Ireland, continental Europe, Africa, Philippines and United States. It has also been adopted as the official style of the World Universities Debating Championship and the European Universities Debating Championship (at which the speakers are given only fifteen minutes' notice of the motion). Speeches are usually between five and seven minutes in duration. The debate consists of four teams of two speakers, sometimes called factions, with two teams on either side of the case.
Because of the style's origins in British parliamentary procedure, the two sides are called the Government and Opposition, while the speakers take their titles from those of their parliamentary equivalents (such as the opening Government speaker, called the Prime Minister). Furthermore, since this style is based on parliamentary debate, each faction is considered to be one of two parties in a coalition. They must therefore differentiate themselves from the other team on their side of the case in order to succeed in their own right.
All speakers are expected to offer Points of Information (POIs) to their opponents. POIs are particularly important in British Parliamentary style, as it allows the first two teams to maintain their relevance during the course of the debate, and the last two teams to introduce their arguments early in the debate. The first and last minute of each speech is considered "protected time", during which no POI may be offered.
Depending on the country, there are variations in speaking time, speaking order, and the number of speakers. For example, in New Zealand, both the leader of the Opposition and the Prime Minister offer a short summary as the last two speakers.
In the United States 
American parliamentary debate is supported by a number of organizations in the United States at the tertiary and secondary levels.
The most popular intercollegiate parliamentary debate style is supported by the National Parliamentary Debate Association (NPDA), which was born in western US in 1991. NPDA circuit consists of a loose confederation of local leagues and a number of invitational tournaments. The NPDA season culminates with two national tournaments – NPDA Nationals and the National Parliamentary Tournament of Excellence (NPTE). NPDA Nationals (founded in 1994) is open to all and attracts about 200 teams each year. NPTE (founded in 2001) is qualification-only and invites the top 64 teams of the approximately 1000 teams that compete in NPDA/NPTE-sanctioned invitationals throughout the season. Phi Rho Pi Nationals for junior and community colleges have an NPDA-style division, as do Novice Nationals. The chief online forum for the NPDA circuit is Net-Benefits.net, started in 2002 by Jed Link.
American Parliamentary Debate Association (APDA), the oldest intercollegiate parliamentary debate league in the US, was founded in 1982. APDA currently has around 40 member universities, primarily in the Northeast.
A number of smaller intercollegiate debate leagues, such as the Lincoln Parliamentary League (LPL) and International Public Debate Association (IPDA) also exist.
The British Parliamentary Style (a.k.a. Worlds Debate, distinct from World Schools Style) is also beginning to spread to the US, with the US Universities Debating Championship held annually at the University of Vermont.
Chamber Debate is a modified form of Australia-Asia debating that sponsors three national tournaments annually using the 3-on-3 format of parliamentary debate  Unlike other formats of parliamentary debate, Chamber Debate allows teams to use electronic devices a via 4th non-speaking member of each team who conducts fact-checking and other research for their team during the round.
High school level
The public school high school debate league, National Forensic League (NFL), does not offer parliamentary debate at its national tournament. It does, however, recognize parli competitions offered at the state level, albeit at a reduced points value. In 2010 NFL Nationals added Supplemental Debate, which bears some similarity to parliamentary debate.
A number of attempts to organize a high school parli championship tournament have been made – National Parliamentary Caucus (2003–2005), NPDL Parli Grand Nationals (2006–2007) and IDEA Tournament of Champions (2005–2009, switched to world format in 2010).
The current incarnation of such championship is the Tournament of Champions, hosted by Point of Information. (2010–present, began accepting out-of-state teams in 2011). It was started as a California championship, named "California Cup," but has been renamed the Tournament of Champions to represent the prestige of the high school tournament.
Oregon State Tournament (OSAA) added parliamentary debate (known In Oregon as Public debate) in 2001, California State Tournament (CHSSA) followed suit in 2003, and Pennsylvania State Tournament (PHSSL) in 2010. Yale, ASU, Whitman, as well as a number of invitational tournaments in Oregon and California, the largest of them held at Stanford, James Logan HS, SCU, UOP, Willamette, University of Oregon, Pepperdine and Claremont HS also offer parli.
On the home school level, the home school debate league, Stoa, also promotes parliamentary debate in a number of its tournaments nationwide. Stoa offers its own parliamentary nationals, PITOC, each year. Stoa does offer parliamentary debate at nationals (NITOC). The other home school debate league, NCFCA, does not offer parliamentary debate at any of its tournaments or is it hosted at nationals.
The first key feature uniting various formats of parliamentary debate in the US is their spontaneity. The resolutions alternate each round and are typically announced 15–20 minutes in advance. APDA is somewhat of an exception in the respect, with "loose link" rounds allowing the affirmative to run a case of their choosing, dealing with virtually any topic. The second key feature of parli is a ban on quoted evidence. Debaters may not bring in any material that was not prepared in the 15–20 minutes of preparation time and consult it during the round. APDA, Worlds and high school parli debate styles tend to take a more lay-friendly approach to debate, ensuring that debates are easy to understand no matter the audience member's expertise of the resolution. NPDA is more diverse, with some teams engaging in a more academic and specific-knowledge style borrowed from Policy debate. Resolutions typically focus on current events, though the entrance of the Kritik to NPDA, and, to a lesser extent, to some high school circuits, introduced a philosophical element to parli.
This style consists of a two-on-two debate, between the affirmative team, known as the Government or the Proposition, and the negative team, referred to as the Opposition. Debater role names are borrowed from the British Parliament, with the judge being referred to as the Speaker. The round consists of six speeches, as follows:
- Prime Minister Constructive (PMC): the first affirmative speaker presents the affirmative case
- Leader of the Opposition Constructive (LOC): the first negative speaker presents the negative case and answers the PMC arguments
- Member of the Government Constructive (MGC): the second affirmative speaker upholds the affirmative case and responds to the LOC arguments
- Member of the Opposition Constructive (MOC): the second negative speaker upholds the negative case and responds to the MGC arguments
- Leader of the Opposition Rebuttal (LOR): the first negative speaker summarizes the round. New arguments are not allowed.
- Prime Minister Rebuttal (PMR):the first affirmative speaker summarizes the round and responds to any new arguments brought up in the MOC/LOC Opp block. New arguments in the PMR are not allowed.
Specific rules and speech times vary slightly between organizations. NPDA, APDA and OSAA use the 7-8-8-8-4-5 format, CHSSA and the ASU Invitational use the Claremont 7-7-7-7-5-5 format, the SCU Invitational uses the 6-7-7-7-4-5 format, and Yale high school tournaments use the Osterweis 4-5-5-5-2-3 format. PHSSL borrows its 8 speeches 6-6-6-6-6-6-3-3 format from World Schools Style debate.
Most variations of the style do not include a specialized cross-examination period, but allow debaters to make parliamentary points.
- Points of Information (POI) are questions or statements the opposing side can direct the speaker who has the floor. The speaker has an option to recognize or decline a POI. In most styles POIs cannot be made during the first and last minute of each speech (known as protected time) or during rebuttals.
- Points of Order are made when the speaker is introducing a new argument during a rebuttal speech, or grossly mischaracterizing arguments. During a Point of Order, official time (usually kept by the judge) is to be stopped while the judge listens and considers the point raised.
- Points of Personal Privilege are made when the speaker makes offensive claims or personal attacks.
World Schools style 
This is a combination of the British Parliamentary and Australian formats, which results in a debate comprising eight speeches delivered by two three-member teams (the Proposition and the Opposition). Each speaker delivers an eight-minute speech – the first two are substansive matter and the third a rebuttal speech; then both teams deliver a "reply speech" lasting four minutes, with the last word being reserved for the Proposition. In junior debates, these limits are changed to about 5 minutes, and in some local competitions, speeches are 7 minutes.
Between the end of the first and the beginning of the last minute of an eight-minute speech, the opposing party may offer "points of information". The speaker may refuse these, but should take at least one or two points during his or her speech. No points of order or Privilege are used.
Topics can be supplied long in advance, or may be given 45 minutes or an hour before the debate begins. There is not much room for re-definition, and squirreling is strictly prohibited. The World Schools Debating Championships is attended by many countries, and is in this format.
A similar format, with 7-minute speeches and Points-of-Information, is known as the Asian Parliamentary Format and is used by the United Asian Debating Championships
See also 
- Public debate
- International university debating
- World Universities Debating Championship
- American Parliamentary Debate Association
- Canadian University Society for Intercollegiate Debate
- North American Debating Championship
- North American Public Speaking Championship
- National Parliamentary Debate Association
- National Parliamentary Tournament of Excellence
- International high school debating
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- Debate organizations
- International Public Debate Association
- American Parliamentary Debate Association United States collegiate parliamentary debate organization.
- National Parliamentary Debate Association United States collegiate parliamentary debate organization.
- National Parliamentary Tournament of Excellence Sponsors U.S.-based parliamentary rankings system and national invitational championship.
- Stoa USA Home School Speech and Debate The home school debate league that offers parliamentary debate and a parliamentary nationals.
- National Parliamentary Debate League United States high school parliamentary debate organization (defunct since 2008).
- Associated Leaders of Urban Debate – A national organization promoting debate to the general public
- Net Benefits United States college NPDA-parli debate forum
- 'Debating': A free online 'how-to' guide (A free 200-page debating book written by a former winner of the World Schools Debating Championship)
- Presentations Teaching Parli Slides from a former director of forensics teaching basics of parliamentary debate
- World Debate Website – Information about university debating events around the globe
- The Judges British Parliamentary Debating est.1999 – An extensive array of unconventional tutorials that focus on the alternative and fun aspects of debate.
- Parlidebate.com – Video and audio recordings of APDA, BP, CUSID and NPDA debate rounds.
- Strategic Argumentation in Parliamentary Debate – College Parliamentary Debate E-Book and Textbook