The moment the referee makes the final whistle and if extra time period or the penalty shoot-out need to be carried out, the match officials have to make sure that this is being managed with professional attitude and efficient management. AR1 will ensure that no players leaves the field of play and no substitutes enter on the right side of the field, while the Fourth Official will attend to the team on the left side while waiting for the AR2 to come after having a drink or rest. When the AR2 takes over from the Standby, he then goes to the AR1 to take over his task to enable him a rest or a drink. Team officials (not substitutes) are allowed to enter to give drinks or discuss with the captain during this short break. The length of this period is subjected to the referee's discretion.
Meantime, as soon as possible after the referee take a rest or drink, he will get both the captains for the toss. Briefing to the assistant referees should have been done in the dressing room prior to the match or during the interval. The referee will then have the restart of the extra time period or the penalty shoot-out taken as soon as possible.
Having a task done as required is effective management but having it done with the least time, effort and professionally is efficiency in management.