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Others worried that the games would slow down with endless replays of every play, call, score, or moment. However, as leagues have added and perfected different systems, most of that criticism has died away. Today, sports are looking for more and more ways to give officials video tools to make the right calls. Electronic Eyes O fficials use more than video instant replay to make sure that they make the right call. The use of multiple cameras and elec- tronic “eyes” has made the split-second deci- sions by officials more accurate than ever.

Goal-line technology used at the 2014 World Cup used seven cameras; (inset) if a goal was scored, it flashed on a screen worn by the referee.

stem in sports: technology

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