The supervisor and the referees in training observe the same sequence of play and must indicate whether they agree with the referee's decision, whether he has made a mistake or has forgotten to whistle a foul. At the end of the sequence played, the supervisor communicates the result of his observation by QR code to the students. The application calculates the percentage of good decisions and sends, by SMS, the results obtained by each referee in training. It is important to start the countdown at the same time because only an offset of 3 seconds is tolerated (speed of decision making)
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