could detect if the ball passed through the field. GoalRef: Another system based on generated magnetic fields and a sensor within the ball. Goalminder: A system based on cameras installed in the goal frame. This provided a visual playback to officials rather than an automatic goal-or-no-goal alert. Hawk-Eye: A Sony-owned system based on multiple high-speed cameras whose images are used to triangulate the position of the ball. Hawk-Eye systems were, and still are, used in several other sports for supporting officiating decisions. Second phase of testing On 3 March 2012, IFAB announced that two of the eight proposed systems had proceeded to the second stage of testing. These were Hawk-Eye and GoalRef. In the second phase of testing, the manufacturer of the technology chose a stadium to test its technology in a number of imagined scenarios. Testing was also conducted in professional training sessions and in laboratories to account for different climatic conditions and other magnetic field distortions. There were also tests on the watches to be worn by referees. The systems underwent testing in some competitive matches. GoalRef technology underwent match testing in some Danish Superliga matches in the first half of 2012. Following the second phase trials, on 5 July 2012 IFAB approved GoalRef in principle, making it available for use in professional matches under a set of revised Laws of the Game. Each installation however would also require licensing approval for use in the individual stadium, on a 12-month basis. The 2012 FIFA Club World Cup was the first tournament where GoalRef was used by a match referee. Goal Ref was used for the first time on 6 December 2012 in the first match of the 2012 FIFA Club World Cup. The first match to use the Hawk-Eye goal-line technology was Eastleigh F.C. versus A.F.C. Totton in the Hampshire Senior Cup final at St Mary's Stadium, Southampton in England on 16 May 2012. Although it used Hawk-Eye, the system had no bearing on the referee's decisions and the system readings were only available to FIFA's independent testing agency. The system was also in place for the technology's second test on 2 June for England's friendly match against Belgium. Introduction Following the success of the trials, in July 2012 IFAB voted unanimously to officially amend the Laws of the Game to permit (but not require) goal-line technology. In December 2012, FIFA announced it would introduce goal-line technology at