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US and English Canadian version[edit]
For more details on these Big Brother versions, see Big Brother (U.S.) and Big Brother Canada.
The United States' and Canada's version of Big Brother is different from most versions of the series. The American series began in 2000 with a format much similar to the international format, however, due to poor ratings and the strong popularity of Survivor, beginning in the second season, a more gameplay-oriented format was implemented where the contestants are encouraged to strategize and form alliances with others to improve their chance at winning. For this new format, a group of 12 to 16 contestants, known as "houseguests," compete to win the series by voting each other off and being the last houseguest remaining. One houseguest, known as the Head of Household (HoH), must nominate two of their fellow houseguests for eviction. The winner of the Power of Veto (PoV, introduced in the 3rd American season) has the option to save one of the nominees for eviction, forcing the HoH to nominate another houseguest in his or her place. The houseguests then vote to evict one of the nominees, and the houseguest with the most votes is evicted. When only two houseguests remain, the most recently evicted houseguests (generally 7) form The Jury and decide which of the two remaining houseguests would win the grand prize.
In 2013, English-speaking Canada began its own version based on the US version, but the viewing audience are given more control of the game. Secret tasks were also introduced and are usually presented by the show's mascot "Marsha the Moose" . These two elements cause fans of the show to call it a hybrid of the U.S edition and the U.K/international editions.
Elements of this format (such as having one contestant winning the position of or similar to Head of Household or allowing contestants to talk and strategize about the nomination/eviction process) have been adapted in other editions of the show, notably the French Canadian version, where the format was followed almost exactly, but the public could evict a housemate on some occasions, and eventually decided the winner in the end.