 The tournament introduced goal-line technology with the Hawk-Eye system by which it is possible to show on the stadium screen if the ball was in or not.It was also the first World Cup for either men or women to be played on artificial turf, with all matches played on such surfaces.There were some initial concerns (please see below) over a possible increased risk of injuries from playing on artificial turf, but a legal challenge suggesting matches should be played on grass as in similar men's tournaments was dropped in January 2015.