Two teams of five family members compete to guess the answers to survey questions asked to 100 people. The answers are seen on a huge survey board, named Mr. Babbage after Charles Babbage, who came up with the idea of a computer that could be programmed. Each answer is worth £1 per point. If a given answer does not make the survey, the family gets a strike. This is indicated by an "Eh-uh" sound effect, which has become a popular element of the show. If a family gets three strikes, the other family can steal the points by giving an answer that makes the survey. After three rounds, Double Money is played. Here, answers are worth £2 a point, and there are usually fewer answers. The first team to reach 300 points goes on to play Big Money.