Big Brother is a television reality game show based on an originally Dutch TV series of the same name created by producer John de Mol in 1997. The series follows a group of contestants, known as HouseGuests, who are living together in a custom-built home under constant surveillance. The HouseGuests are completely isolated from the outside world, and can have no communication with those not in the house. The contestants are competing for a $500,000 grand prize, with weekly competitions and evictions determining who will win the show. The series takes its name from the character in George Orwell's novel Nineteen Eighty-Four (1949). The series launched on July 5, 2000 to a successful start, though ratings and critical reaction continued to grow increasingly negative. This led to the second season being a revamp of the show, featuring a more competition based challenge. The series has since continued to be a hit for CBS, and is the longest-running adaption of the series to date.