i) For the underground nerve center located under Cinderella Castle, to evaluate the effectiveness of waiting line control initiatives undertaken by the center, the performance measures should be used are that the managers can look at the average waiting time of each customer on the queue, whether it has improved or shorten. For example, before, each customer had to wait an hour to get into the Cinderella Castle; now, after executing the waiting control system, he or she needs to wait only 30 minutes to get in to the place, we can say that the waiting control is effective.

Another way to evaluate the system is to watch the wait-time gradations, if the outline has consistently green light (yellow light means the line is moving slowly and customers waiting time more than expected, green light means the queue is moving in the control speed, and red light means which means the customers are waiting on a reasonable amount of time and still happy, and the place does not stopping operating, the we can say that the waiting control system is effective.

Also, the managers can look at the number of rides of customers who playing the Cinderella Castle has. If they have more than nine rides, then the managers can say that the waiting control system is effective, the average rides that each visitor has had is only nine, since it could indicate that the waiting time in the line to get into the Cinderella Castle has shortened and they have time to visit other places.

Moreover, the managers can look at the total number of visitors visit the Cinderella Castle at the end of each day. If the number of visitors have increased, the waiting control initiatives undertaken by the center is effective as it shows that the waiting time has shortened, the number of people give up the line has decreased, and more people have the chance to get into the Castle and enjoy the