Categories

In season 1, the show was split into three categories: 16-24s, Over 25s and Groups.^[14] In seasons 2-7, the 16-24s category was split into separate male and female sections, making four categories in all: Boys, Girls, Over 25s, and Groups.^[15][16] In season 3 onwards, the minimum age for the Boys and Girls categories was lowered to 14.^[17] In season 5 only, the Over 25s was changed to Over 24s.^[18] In season 6, It was changed back to Over 25s for series 6, In Season 8, the Over 25s was changed to Over 22s, Boys and Girls has been defunct and making the 14-21s to come back, Bands are now able to audition, any can play instruments - they will be part of the Groups category.

Stages

There were five stages to the competition:

• Stage 1: Open auditions:^[19] these auditions decided who would sing in front of the judges (season 2–8)
• Stage 2: Judges' auditions
• Stage 3: Masterclass (season 1), bootcamp (season 2–6) or seat challenge (season 7–8)
• Stage 4: Judges' houses (season 1) or super home visits (season 2–7)
• Stage 5: Live shows (finals)

For the first season, the judges' auditions, masterclass, the judges' houses and the live finals were the four stages to the competition. For the revived second season, the stages changed to open auditions, judges' auditions, bootcamp, super home visits and the live shows. This remained unchanged until season 8, when the stages changed to open auditions, judges' auditions, three seat challenge and the live shows.

Auditions

In the first round, the first set of auditions were held in front of the show's producers, months before The X Factor was aired. The open auditions were not televised and anyone could attend. The successful auditionees chosen by the producers were invited back to the last set of the audition phase, which took place in front of the show's judging panel and a live audience. If there were three judges present during the auditions, the act needed at least two "yes" votes (three if there were four judges present) to gain the majority vote.^[15] The judges' auditions were held on selected dates and locations in a number of major cities of Australia, and were broadcast over the first few weeks of The X Factor. The show was open to solo artists and vocal groups aged 14 and above, with no upper age limit.^[17] Only a selection of auditions in front of the judges were broadcast, usually the best, the worst and the most bizarre. During the first season of The X Factor, each act entered an audition room and delivered a stand-up unaccompanied performance of their chosen song to the judges, without any instrumental music playing.

Bootcamp and super home visits

In the second round, participants who reach this stage are sent to a "bootcamp" to refine their performances, while they are organised into categories based on the conditions of their application. The first category consists of men and women solo acts aged under 24 – both categories were conjoined in the first series until separated in the second series – with the minimum age allowed being 16 (except for the third to seventh series where it was lowered to 14) then it got conjoined back in the eight series with the minimum age allowed being 14. The third category consists of men and women solo acts aged 25 and older (with the exception of 1 series were the minimum age was raised to 22 in series 8 and 24 in series 5).

During the bootcamp stage^[20] (formerly lock down in season 1, and super bootcamp in seasons 4–6),^[14] each judge was assigned one of the four categories to mentor.^[15] It was usually held on three days. In seasons 1, 2 and 3, each judge was given 24 acts and had to decide on their 12 acts after day two, and their six acts after day three. Each judge was assisted by a celebrity guest judge who would help them choose their acts. In season one, the judges narrowed down their acts to five instead of six.^[14] In seasons 4, 5 and 6, all four judges worked together to collectively choose 24 acts (six from each category) for the next round, home visits, where they find out which category they will mentor. From season 7, bootcamp were now based around the five seat challenge, where each judge chose their five acts to go through to the super home visits.^[21]

From seasons 1 to 7, the super home visits stage (formerly judges' houses in seasons 1–2, and home visits in seasons 3–6),^[22] saw the judges and their remaining six acts travel to four different places of the world. From season seven, all four judges and their remaining five acts traveled to the same location.^[21] During the super home visits, each act performed one song in front of their mentor and celebrity guest judges.^[23] Afterwards, each mentor and their guest judges narrowed down the acts to three for the live shows.^{[citation needed]}

Live shows and winner's prize

The finals consisted of two live shows, the first featuring the contestants' performances and the second revealing the results of the public voting, culminating in one/two acts being eliminated each week.^[15] The live shows were filmed at Fox Studios in Sydney. In season 1, the shows were filmed at Hisense Arena (formerly Vodafone Arena) in Melbourne.^[24] In season two, the live shows were broadcast on Sunday and Monday nights, but moved to Monday and Tuesday nights for seasons three and four. In season five, the live shows returned to Sunday and Monday nights. In season seven, the live shows were once again broadcast on Monday and Tuesday nights.^[25]

In the initial performance shows, each act performed one song (two songs each during the Semi-Final and three songs each during the Grand Final) in front of the judges and a studio audience.^[26][27] The acts usually sung over a pre-recorded backing track, and backup dancers were commonly featured as well as stage props.^[28] Acts occasionally accompanied themselves on guitar or piano.^[29] From the second season, each performance show had a different theme; each act's song was chosen according to the theme.^[28][30] The acts' mentors picked the song for them and critiqued their performance in order to get it perfect for the live shows. A celebrity guest connected to the theme was often invited onto The X Factor, and clips were shown of the guest conversing with the contestants at rehearsal.^[31][32] After each act had performed, the judges commented on their performance. Once all the acts had performed, the phone lines opened and the viewing public voted on which act they wanted to keep in the competition.

The results were announced during the live decider show the following day, in aid to give the Australian public time to vote. The two acts that received the lowest number of votes performed again in the "final showdown", and the judges voted on which of the two to send home.^{[citation needed]} In the first season, there would never be an even number, therefore one act would always be eliminated by a majority. However, once a fourth judge was added to the panel, this was possible and "deadlock" was introduced in case of a tie vote.^[33] If the final showdown got to deadlock, the act with the lowest number of votes was eliminated from the competition.^[33] The actual number of votes cast for each act was not revealed, nor was the order. The results show also featured a number of celebrity guest performers promoting their singles or albums, usually their latest ones.^[34][35] The winner of The X Factor was awarded a $1,000,000 recording contract with Sony Music Australia.^[17] In season three, the winner was also awarded a management contract,^[36] and in season four, a Nissan Dualis car.^[37]

Judges

The X Factor debuted in 2005 with Australian recording artist Kate Ceberano, record producer Mark Holden, and Scottish events manager John Reid as the judges.^[38] Ceberano's judging skills were compared to X Factor UK judge, Sharon Osbourne.^[39] When it was announced that The X Factor would return in 2010, British reality television star Peter Andre was linked to the role. However, he declined the offer as he did not want to be away from his children for so long.^[40] The judging line up was announced in May 2010 with Irish recording artist Ronan Keating, radio presenter Kyle Sandilands, and Australian recording artists Guy Sebastian and Natalie Imbruglia.^[41] On 16 March 2011, Sandilands announced that he would not be returning for season 3, stating that he left the show because "it's just too hectic, it's too much work".^[42] On 27 April 2011, the Seven Network confirmed that Mel B would be Sandilands' replacement,^[43] and Natalie Bassingthwaighte was confirmed as Imbruglia's replacement on 6 May 2011.^[44] Bassingthwaighte said she would focus on bringing an honest critique to the show and will guide "the artists through the competition",^[45] while Mel B said, "[The contestants] are either going to love me or hate me but it's going to be a fun ride. I'm really easy to get on with and I'm a hard worker. I'm firm but nice."^[46] Keating, Sebastian, Bassingthwaighte and Mel B returned for the fourth season in 2012.

In March 2013, Keating confirmed in an interview with News Limited that Sebastian and Mel B had left the show, but stated that he wanted them to return.^[47] Dannii Minogue was announced as Mel B's replacement on 12 April 2013,^[48] and Redfoo was announced as Sebastian's replacement on 21 April 2013.^[49] Minogue, Redfoo, Bassingthwaigte and Keating returned for season 6 in 2014.^[50] In April 2015, Keating and Bassingthwaighte announced that they would not be returning for the season 7 in 2015.^[51][52] Redfoo also announced his departure the following month.^[53] On 3 May 2015, it was announced that Sebastian would be returning to the panel along with two new judges James Blunt and Chris Isaak.^[54] Minogue was the only judge from the previous season who returned.^{[citation needed]} On 12 June 2016, Iggy Azalea was announced as a new judge for the series.^{[citation needed]} On 20 June 2016, Guy Sebastian was confirmed to be returning as a judge.^{[citation needed]} The following day, Adam Lambert was announced as the third judge for season 8.^[55] In October 2016, it was confirmed that former judge Mel B would be joining the show as the fourth and final judge for season 8, as "The Underdog Judge".^[56]

• Judges gallery
• Kate Ceberano (2005)
• Natalie Imbruglia (2010)
• Ronan Keating (2010–2014)
• Kyle Sandilands (2010)
• Guy Sebastian (2010–2012, 2015–2016)
• Natalie Bassingthwaighte (2011–2014)
• Mel B (2011–2012, 2016)
• Dannii Minogue (2013–2015)
• Redfoo (2013–2014)
• James Blunt (2015)
• Chris Isaak (2015)
• Iggy Azalea (2016)
• Adam Lambert (2016)

Hosts and other personnel

When The X Factor began in 2005, Daniel MacPherson was the main host of the show and Chloe Maxwell was the host of the spin-off show, The Xtra Factor. Following the announcement that The X Factor was returning in 2010, the Herald Sun reported that MacPherson was favourite to fill the hosting role but was unable to commit because of his duties on Dancing with the Stars.^[57] On 30 May 2010, actor Matthew Newton was announced as the host.^[58] However, on 22 August 2010, it was revealed that Newton had to withdraw after an altercation in Rome with his now ex-girlfriend Rachael Taylor. Newton flew from Rome to Dublin, where he was to film segments for The X Factor with Keating. However, he was escorted back to Australia by a producer of the show after they decided he was in no state to film.^[59] He was then checked into Wentworthville's Northside West Clinic.^[60]

On 23 August 2010, it was announced that actor Luke Jacobz would take over as host and all original audition footage with Newton was removed with footage of Jacobz being shot instead.^[61][62] On 28 August 2010, it was announced that radio presenter Natalie Garonzi would host The Xtra Factor on 7Two.^[63] Season three finalist Johnny Ruffo joined the fourth season live shows as the host of the online live streaming show, The X Stream.^[64] Comedy duo Luke & Wyatt joined the sixth season live shows as the hosts of the online show, The Fan Factor.^[65] On 24 November 2015, Jacobz announced on his Twitter account that he would not be returning as the host for the eighth season in 2016.^[66] On 25 June 2016, Jason Dundas was announced as Jacobz's replacement.^{[citation needed]}

• Hosts gallery
• Daniel MacPherson (2005)
• Luke Jacobz (2010–2015)
• Jason Dundas (2016)

Judges' categories and their contestants

In each season, each judge is allocated a category to mentor and chooses a small number of acts (three acts) to progress to the live finals. This table shows, for each season, which category each judge was allocated and which acts he or she put through to the live finals.

  – Winning judge/category. Winners are in bold, eliminated contestants in small font.

Viewership

Awards and nominations

The Xtra Factor

The Xtra Factor is a companion show that was broadcast after the main live shows.^[63] In season one, The Xtra Factor was broadcast on Network Ten and hosted by Chloe Maxwell. After The X Factor was revived for a second season in 2010, Natalie Garonzi became the new host of The Xtra Factor on the Seven Network's digital channel 7Two.^[63] The show was not renewed when The X Factor returned for a third season in 2011. The voiceover for both series of The Xtra Factor was Nicholas McKay.^{[citation needed]}

The show featured behind-the-scenes footage of The X Factor and the emotional responses of the contestants after the judges commented on their performances. A celebrity panel was usually featured, who gave their opinions on the contestants. The judges and contestants also answered phone calls from viewers, while Facebook statuses, tweets, and SMS messages appeared on screen. The Xtra Factor also showed extra auditions, bootcamp performances and the judges' houses performances.

During the finalists time on The X Factor, The Xtra Factor camera crew followed the finalists about during their day. The footage which was filmed throughout the week would be broadcast once the show went live, once a week. There would also be an exclusive interview of the act which had been eliminated during that week of the show, and an exclusive interview with the winner and their mentor.

The X Stream

The X Stream is an online live streaming show that was broadcast via The X Factor's official website during the season four live performance shows on Monday nights.^[64] The show began on 17 September 2012 and was hosted by season three finalist Johnny Ruffo.^[64] The X Stream featured behind-the-scenes footage of the green room where contestants stay before and after their performances, a view of them waiting backstage as well as the contestants' responses after the judges commented on their performances. They also answered questions from viewers via Twitter.^[64] The X Stream did not return in 2013.

The Fan Factor

The Fan Factor is an online show that was hosted by comedy duo Luke & Wyatt.^[65] It began on 13 August 2014 and featured an all-access pass to The X Factor.^[65][105] The hosts also answered questions and completed challenges that viewers sent in.^[65] New episodes were released via The X Factor's official website on Wednesday nights.^[106] The Fan Factor did not return in 2015.

Charity singles

The top twelve finalists of the fourth season recorded a cover of Carly Rae Jepsen's "Call Me Maybe" as a charity single, in aid of Sony Foundation's You Can program which aims "to build specialised and age-appropriate youth cancer centres across Australia".^[121] The single was released on the iTunes Store on 18 September 2012.^[122] It marked the first time finalists on the Australian version had released a charity single.^[121] The show's second charity single, a cover of Pharrell Williams' "Happy", was also released to help raise funds for the You Can program.^[123] It was recorded by the top six finalists of the sixth season with Australian pop group Justice Crew and released on the iTunes Store on 29 September 2014.^[124]