You work at the drive through window at a fast food restaurant. You are expected to hand the customer their order or ask them to move to a "waiting spot" in less than 2 minutes. There is a monitor right by the drive through window that tells you what goes in the order. Your clear each order when you hand it to the customer and it disappears from the monitor. The order are color coded: orders in green text are still under two minutes and order that are more than two minutes old turn red. The system also alerts the manager if there are more than three orders that are more than two minutes. This is an example of: