Goal line technology for football put to test
24 November 2011 Last updated at 15:30 GMT
One of the most contentious issues in world sport is whether a ball has crossed the goal line in the penalty box in football.
A Bolton-based firm called GoalMinder thinks it has an answer to the problem, with a new piece of technology.
The BBC's Richard Conway spoke to the co-inventor of Goalminder, Harry Barnes, and former player Lee Sharpe, an advocate of the technology, to find out how it could affect the game of football.