In association football, goal-line technology (sometimes referred to as a Goal Decision System[1]) is a method used to determine when the ball has slightly crossed the goal line with the assistance of electronic devices and at the same time assisting the referee in awarding a goal or not. The objective of goal-line technology (GLT) is not to replace the role of the officials, but rather to support them in their decision-making. The GLT must provide a clear indication as to whether the ball has fully crossed the line, and this information will serve to assist the referee in making his final decision.[2] In the wake of controversial calls made in the Premier League, 2010 World Cup and the Euro 2012, FIFA (previously against the technology) tested potential candidates for goal-line technology. Nine systems were initially tested, but only two remain.
On 5 July 2012, the International Football Association Board (IFAB) officially approved the use of goal line technology. The two systems approved in principle were involved in test phase 2: GoalRef and Hawk-Eye. In December 2012, FIFA announced it would introduce goal-line technology in a competitive match for the first time at the 2014 FIFA World Cup in Brazil.[3] Starting in 2013, in the United States technology has been used in Major League Soccer. However MLS' Canadian teams do not use them in their home games due to the lack of funding. Goal-line technology was also implemented for the 2014 FIFA World Cup held in Brazil whereby the GoalControl system was installed in each of the 12 stadiums.[4]