Big Brother (Australian season 1)

The House used for Big Brother 1 was located inside of Dreamworld.[5] The House featured a total of 25 cameras and 32 microphones in the various rooms and backyard. The house for the first series was very basic, as part of the theme of the series. The House featured a living room, which had a fireplace for the Housemates to use, and a kitchen, which featured a stove and sink, along with the fridge. There was a large dining table in the kitchen, with room for all of the Housemates. Various two way mirrors are in the house, with a camera crew behind him. The House also featured two bedrooms, with each bedroom featuring six beds. The first bedroom had a double bed and featured blue walls and orange sheets. The bathroom featured blue tile flooring and a clear shower. Housemates could communicate with producers in the room known was the "Diary Room". The Diary Room in this season featured yellow walls and an orange chair, and had a simplistic design. This was where nominations took place, and where Housemates could reveal their thoughts. Housemates could be seen by a medical professional in the Diary Room if necessary. Furniture and homewares in the house were provided by Freedom Furniture. The outside of the House featured a chicken coop with various chickens inside, from which the Housemates collect eggs. The Housemates were also given a swimming pool in the backyard to use. There was also a garden in the backyard, which featured a vegetable patch which the Housemates could use.

The format used for Big Brother in Australia remained largely unchanged from that featured in other editions of the series, though some differences were incorporated. Big Brother is a game show in which a group of contestants, called Housemates, live in isolation from the outside world in a custom built "house", which includes everyday facilities such as a fully equipped kitchen, garden, two bedrooms, and a bathroom. The house is also a television studio with cameras and microphones in most of the rooms to record the activities of the Housemates. The only place where Housemates can escape the company of the other contestants is the Diary Room, where they are encouraged to voice their true feelings. Not all Diary Room footage is broadcast due to the privacy of the contestants. Each week all Housemates nominate two of their fellow contestants for potential eviction. They award two points to one Housemate, and one point to another. Failure to do so may result in a punishment, such as a reduction in the prize fund. The three, or more, Housemates with the highest number of nominations face a public vote conducted by phone, with the contestant receiving the most votes being evicted from the house. The last contestant remaining in the house is declared the winner and is awarded a cash prize of $250,000. On eviction night, host Gretel Killeen would inform the nominees which of them had been evicted from the house. Following the announcement, the evicted Housemate had to gather their belongings and exit the house. Upon exiting through the house's front door, Killeen led the evictee into a studio where they met with their family and friends. While in the studio, Killeen had an interview with the evicted Housemate, and showed their best bits - a video compilation of their time in the house.

Over the duration of the series, the Housemates were given a series of tasks by Big Brother which tested them in many ways. They were also put to the test by their own ideals, prejudices and opinions against other people from different walks of life; something that has survived from the original "social experiment" of Big Brother 1. They lived in the communal House and shared cooking and cleaning chores amongst themselves. Housemates were forbidden to sleep during daylight hours (unless unwell) - Big Brother plays the wake-up call persistently in the morning if Housemates do not wake up and will play an alarm clock noise into the house if a Housemate falls asleep during the day. Housemates must also live by the fundamental rules of Big Brother; if the rules are broken it can result in formal warnings, various punishments or even a Housemate's removal from the game. They must wash their own clothes by hand, and they have to make their own bread from scratch. Each week Big Brother sets the Housemates a task in order to determine the shopping budget for the following week. They must work together to win the tasks in order to win a luxury shopping budget which changed based on the number of people remaining in the house. If all food runs out in the House, Big Brother provides emergency rations of chickpeas and rice. Housemates were responsible for their own shopping and decide which items the budget will allow them to have. Only a small percentage of the overall budget can be spent on alcohol.

Big Brother 1 featured some twists to the format throughout the course of the season. On Day 36, Housemates Anita and Rachel entered the house as intruders. Though they were official Housemates, they learned that they were automatically nominated for eviction. Their fellow Housemates then decided which of the two should be evicted from the house, and the Housemate with the most votes was then evicted. The survivor of the eviction was then given immunity from the following round of nominations. Yet another twist in the format occurred on Day 84, only a day before the season finale, when the Housemate who had come in third place was evicted from the house. The finale occurred on the final day, with only two of the three finalists remaining in the house.

The first housemate in each box was nominated for two points, and the second housemate was nominated for one point.

• Johnson-woods, Toni (2002). Big Bother: Why Did That Reality TV Show Become Such a Phenomenon?. Australia: University of Queensland Press. p. 256. ISBN 0-7022-3315-3.