During UEFA EURO 2012, the decisions taken by assistant referees on offside were monitored, and underlined the value of the additional assistant referees. Some 435 decisions were made with the attacking player one metre from the offside line. "435 decisions taken – 95.9% accuracy," said Collina. "It means that we had a very small number of mistakes made by assistant referees. The assistant referee can focus their attention only on offside; they do not have to worry about what is going on in the penalty area, their main task is not to assist the referee on something going [on] in the penalty area but only to focus their attention on offside."